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Daikin RXYQ96PYDN Service Manual

R-410a heat pump 60hz, r-410a heat recovery 60hz.
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Advertisement

RXYQ72, 96, 120PYDN
RXYQ72, 96, 120PTJU
RXYQ72-240PYDN, PTJU
R-410A Heat Pump 60Hz
REYQ72-240PYDN, PTJU
R-410A Heat Recovery 60Hz
RXYQ144-240PYDN
RXYQ168-240PTJU
REYQ72, 96, 120PYDN
REYQ72, 96, 120, 144PTJU
RXYQ144PTJU
SiUS34 - 801A_b
REYQ144-240PYDN
REYQ168-240PTJU

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   Summary of Contents for Daikin RXYQ96PYDN

  • Page 1 SiUS34 - 801A_b RXYQ72-240PYDN, PTJU R-410A Heat Pump 60Hz REYQ72-240PYDN, PTJU R-410A Heat Recovery 60Hz RXYQ72, 96, 120PYDN RXYQ144-240PYDN REYQ72, 96, 120PYDN REYQ144-240PYDN RXYQ72, 96, 120PTJU RXYQ168-240PTJU REYQ72, 96, 120, 144PTJU REYQ168-240PTJU RXYQ144PTJU...
  • Page 2: Table Of Contents

    SiUS34-801A_b R-410A Heat Pump/ Heat Recovery 60Hz 1. Introduction ....................vii 1.1 Safety Considerations ................vii 1.2 PREFACE ....................xiii Part 1 General Information1 1. Model Names of Indoor/Outdoor Units............2 2. External Appearance...................3 2.1 Indoor Units ....................3 2.2 Outdoor Units ....................4 3.
  • Page 3 SiUS34-801A_b 7.2 Large Capacity Start Up Control (Heating)..........51 7.3 Oil Return Operation .................. 52 7.4 Defrost Operation ..................56 7.5 Pump-down Residual Operation ..............58 7.6 Standby ...................... 60 7.7 Stopping Operation ..................61 8. Protection Control ..................63 8.1 High Pressure Protection Control............... 63 8.2 Low Pressure Protection Control..............
  • Page 4 SiUS34-801A_b 6.1 Normal Operation ..................188 6.2 Compressor PI Control................189 6.3 Electronic Expansion Valve PI Control............. 193 6.4 Step Control of Outdoor Unit Fans ............194 6.5 Outdoor Unit Fan Control in Cooling Operation ........194 6.6 Heat Exchanger Control ................195 7.
  • Page 5 SiUS34-801A_b 6. Control of Electronic Expansion Valve ............293 7. Freeze Prevention...................294 8. Heater Control (Optional PC Board KRP1B ... is required.)....295 9. List of Louver Operations ................296 10.Hot Start Control (In Heating Operation Only) ........297 11.Louver Control for Preventing Ceiling Dirt..........298 12.Field Setting ....................299 12.1 Field Setting from Remote Controller ............
  • Page 6 SiUS34-801A_b 3.23 H7 Outdoor Unit: Abnormal Outdoor Fan Motor Signal ......375 3.24 H9 Outdoor Unit: Malfunction of Thermistor (R1T) for Outdoor Air ..377 3.25 J2 Outdoor Unit: Current Sensor Malfunction......... 378 3.26 J3 Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R31, 32T) . 380 3.27 J4 Outdoor Unit: Malfunction of Temperature Sensor for Heat Exchanger Gas (R2T or R11T) ..................
  • Page 7 SiUS34-801A_b 4.1 M1 PC Board Defect ................. 446 4.2 M8 Malfunction of Transmission between Optional Controllers for Centralized Control...................... 447 4.3 MA Improper Combination of Optional Controllers for Centralized Control 449 4.4 MC Address Duplication, Improper Setting ..........451 5. Troubleshooting (OP: Unified ON/OFF Controller) .........453 5.1 Operation Lamp Blinks ................
  • Page 8: Introduction

    Introduction SiUS34-801A_b 1. Introduction Safety Considerations Cautions and Read these SAFETY CONSIDERATIONS carefully before installing air conditioning equipment, and be sure to install it correctly. After completing the installation, make sure that the unit operates properly during Warnings the start-up operation. Instruct the customer how to operate and maintain the unit.
  • Page 9 SiUS34-801A_b Warning When disconnecting the suction or discharge pipe of the compressor at the welded section, release the refrigerant gas completely at a well-ventilated place first. If there is a gas remaining inside the compressor, the refrigerant gas or refrigerating machine oil discharges when the pipe is disconnected, and it can cause injury.
  • Page 10 Introduction SiUS34-801A_b Caution Do not repair the electrical components with wet hands. Working on the equipment with wet hands can cause an electrical shock. Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical shock. Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid electrical shocks.
  • Page 11 SiUS34-801A_b Warning When relocating the equipment, make sure that the new installation site has sufficient strength to withstand the weight of the equipment. If the installation site does not have sufficient strength and if the installation work is not conducted securely, the equipment can fall and cause injury. Be sure to install the product correctly by using the provided standard installation For integral units frame.
  • Page 12 Introduction SiUS34-801A_b Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks.
  • Page 13 SiUS34-801A_b Caution Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 ohm or higher. Faulty insulation can cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage can cause the water to enter the room and wet the furniture and floor.
  • Page 14: Preface

    This is the new service manual for Daikin's Year 2008 VRVIII series Heat Pump System. Daikin offers a wide range of models to respond to building and office air conditioning needs. We are confident that customers will be able to find the models that best suit their needs.
  • Page 15 SiUS34-801A_b...
  • Page 16 SiUS34-801A_b Part 1 General Information 1. Model Names of Indoor/Outdoor Units............2 2. External Appearance...................3 2.1 Indoor Units ....................3 2.2 Outdoor Units ....................4 3. Combination of Outdoor Units..............5 4. Model Selection...................6 General Information...
  • Page 17: General Information1

    Model Names of Indoor/Outdoor Units SiUS34-801A_b 1. Model Names of Indoor/Outdoor Units Indoor Units Power Supply, Type Model Name Compatibility Symbol Ceiling-Mounted Cassette Type FXFQ — — — (Multi Flow) 4 Way Ceiling Mounted Cassette Type Unit FXZQ 07M7 09M7 12M7 18M7 —...
  • Page 18: External Appearance

    SiUS34-801A_b External Appearance 2. External Appearance Indoor Units 2.1.1 Indoor Units Heat Pump, Heat Recovery (60Hz) Ceiling-mounted cassette type (Multi flow) Ceiling suspended type FXFQ12MVJU FXHQ12MVJU FXFQ18MVJU FXHQ24MVJU FXFQ24MVJU FXHQ36MVJU FXFQ30MVJU FXFQ36MVJU 4 way ceiling-mounted cassette unit Wall mounted type (2’×2’) FXAQ07MVJU FXZQ07M7...
  • Page 19: Outdoor Units

    External Appearance SiUS34-801A_b Outdoor Units H/P (460V) RXYQ72P, 96P, 120PYDN — H/P (460V) RXYQ144P, 168P, 192P, 216P, 240PYDN H/P (230V) RXYQ72P, 96P, 120PTJU H/P (230V) RXYQ144PTJU H/P (230V) RXYQ168P, 192P, 216P, 240PTJU H/R (460V) REYQ72P, 96P, 120PYDN H/R (460V) REYQ144P, 168P, 192P, 216P, 240PYDN H/R (230V) REYQ72P, 96P, 120P, 144PTJU H/R (230V)
  • Page 20: Combination Of Outdoor Units

    Piping Kit (Option) 12 ton (460V) 14 ton Heat Recovery: BHFP26P90U 16 ton 18 ton 20 ton Note: For multiple connection of 12 ton system or more, an optional Daikin Outdoor Unit Multi Connection Piping Kit is required. General Information...
  • Page 21: Model Selection

    Model Selection SiUS34-801A_b 4. Model Selection VRVIII Series Connectable Indoor Units Number and Capacity Heat Pump 12 ton 12 ton 6 ton 8 ton 10 ton 14 ton 16 ton 18 ton 20 ton (230V) (460V) System name RXYQ72P RXYQ96P RXYQ120P RXYQ144PTJU RXYQ144P RXYQ168P RXYQ192P RXYQ216P RXYQ240P Outdoor unit 1 RXYQ72P RXYQ96P RXYQ120P RXYQ144PTJU RXYQ72P RXYQ72P RXYQ72P RXYQ96P RXYQ120P —...
  • Page 22 SiUS34-801A_b Model Selection Indoor Unit Capacity New refrigerant model code 07 type 09 type 12 type 18 type 24 type 30 type 36 type 48 type 7,500 9,500 12,000 18,000 24,000 30,000 36,000 48,000 Selecting model capacity Btu/h Btu/h Btu/h Btu/h Btu/h Btu/h...
  • Page 23 Model Selection SiUS34-801A_b General Information...
  • Page 24 SiUS34-801A_b Part 2 VRVIII R-410A Heat Pump 60Hz 1. Specifications ....................11 1.1 Outdoor Units ..................... 11 2. Refrigerant Circuit ..................17 2.1 RXYQ72P, 96P, 120P ................17 2.2 RXYQ144PTJU ..................18 3. Functional Parts Layout RXYQ72P, 96P, 120P ........21 3.1 RXYQ144PTJU ..................21 4.
  • Page 25: Vrviii R-410a Heat Pump 60hz9

    SiUS34-801A_b 9.3 Heating Operation Prohibition ..............71 10.Test Operation ..................72 10.1 Installation Process ..................72 10.2 Procedure and Outline ................73 10.3 Operation when Power is Turned On ............91 11.Outdoor Unit PC Board Layout ..............93 12.Field Settings ....................94 12.1 Field Settings on the Outdoor Unit ............. 94 VRVIII R-410A Heat Pump 60Hz...
  • Page 26: Specifications

    SiUS34-801A_b Specifications 1. Specifications Outdoor Units Heat Pump 60Hz <RXYQ-PYDN> 460V Model Name RXYQ72PYDN RXYQ96PYDN RXYQ120PYDN Power Supply 3 Phase 60Hz 460V 3 Phase 60Hz 460V 3 Phase 60Hz 460V 1 Cooling Capacity Btu / h 72,000 96,000 120,000 2 Heating Capacity...
  • Page 27 Heat Pump 60Hz <RXYQ-PYDN> 460V Model Name (Combination Unit) RXYQ144PYDN RXYQ168PYDN RXYQ192PYDN RXYQ72PYDN RXYQ72PYDN RXYQ72PYDN Model Name (Independent Unit) RXYQ72PYDN RXYQ96PYDN RXYQ120PYDN Power Supply 3 Phase 60Hz 460V 3 Phase 60Hz 460V 3 Phase 60Hz 460V 1 Cooling Capacity Btu / h 144,000 168,000...
  • Page 28 SiUS34-801A_b Specifications Heat Pump 60Hz <RXYQ-PYDN> 460V Model Name (Combination Unit) RXYQ216PYDN RXYQ240PYDN RXYQ96PYDN RXYQ120PYDN Model Name (Independent Unit) RXYQ120PYDN RXYQ120PYDN Power Supply 3 Phase 60Hz 460V 3 Phase 60Hz 460V 1 Cooling Capacity Btu / h 216,000 240,000 2 Heating Capacity...
  • Page 29 Specifications SiUS34-801A_b Heat Pump 60Hz <RXYQ-PTJU> 230V Model Name RXYQ72PTJU RXYQ96PTJU RXYQ120PTJU Power Supply 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 1 Cooling Capacity Btu / h 72,000 96,000 120,000 2 Heating Capacity Btu / h 81,000 108,000 135,000...
  • Page 30 SiUS34-801A_b Specifications Heat Pump 60Hz <RXYQ-PTJU> 230V Model Name RXYQ144PTJU RXYQ168PTJU RXYQ192PTJU RXYQ72PTJU RXYQ72PTJU Model (Independent Unit) — RXYQ96PTJU RXYQ120PTJU Power Supply 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 1 Cooling Capacity Btu / h 144,000 168,000 192,000...
  • Page 31 Specifications SiUS34-801A_b Heat Pump 60Hz <RXYQ-PTJU> 230V Model Name (Combination Unit) RXYQ216PTJU RXYQ240PTJU RXYQ96PTJU RXYQ120PTJU Model Name (Independent Unit) RXYQ120PTJU RXYQ120PTJU Power Supply 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 1 Cooling Capacity Btu / h 216,000 240,000 2 Heating Capacity Btu / h 243,000 270,000...
  • Page 32: Refrigerant Circuit

    SiUS34-801A_b Refrigerant Circuit 2. Refrigerant Circuit RXYQ72P, 96P, 120P No. in refrigerant Symbol Name Major Function system diagram Inverter compressor (INV) Inverter compressor is operated on frequencies between 52Hz and 210Hz by using the inverter, while Standard compressor is operated with commercial power supply only. The number of operating steps is as follows when Inverter compressor is operated in Standard compressor 1 combination with Standard compressor.
  • Page 33: Rxyq144ptju

    Refrigerant Circuit SiUS34-801A_b RXYQ72P, 96P, 120P Stop Valve Liquid Pipe S1NPH Stop Valve High Side Equalizer Pipe Stop Valve Gas Pipe S1PH S2PH S2NPL Gauge Port Stop Valve Low Side Equalizer Pipe RXYQ144PTJU No. in refrigerant Symbol Name Major Function system diagram Inverter compressor (INV1)
  • Page 34 SiUS34-801A_b Refrigerant Circuit Electronic expansion valve While in heating operation, PI control is applied to keep the outlet superheated degree of 5(6) (Y3E) (Main1 (Main2)) the outdoor unit heat exchanger constant. Electronic expansion valve PI control is applied to keep the outlet superheated degree of subcooling heat exchanger 7(8) (Y5E) (Subcool1 (Subcool2))
  • Page 35 Refrigerant Circuit SiUS34-801A_b RXYQ144PTJU (12ton Single Type) (INV Unit × 2) Liquid Subcool Heat Exchanger 2 Pipe Left Stop Valve Heat Exchanger 2 Dual Pressure Gas Pipe Stop Valve S2PH INV2 Suction Pipe Stop Valve Subcool Heat Exchanger 1 Liquid Pipe Right Heat Exchanger 1 Gauge Port...
  • Page 36: Functional Parts Layout Rxyq72p, 96p, 120p

    SiUS34-801A_b Functional Parts Layout RXYQ72P, 96P, 120P 3. Functional Parts Layout RXYQ72P, 96P, 120P Plan REFRIGERANT REGULATOR Front View GROUND WIRE Note: For reference number, refer to page 17. RXYQ144PTJU VRVIII R-410A Heat Pump 60Hz...
  • Page 37 Functional Parts Layout RXYQ72P, 96P, 120P SiUS34-801A_b Plan Front View COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE Note: For reference numbers, refer to page 18. VRVIII R-410A Heat Pump 60Hz...
  • Page 38: Refrigerant Flow For Each Operation Mode

    SiUS34-801A_b Refrigerant Flow for Each Operation Mode 4. Refrigerant Flow for Each Operation Mode RXYQ72, 96, 120PYDN, PTJU Cooling Operation RXYQ72, 96, 120PYDN, PTJU Liquid Pipe Indoor Unit Stop Valve Fan "OFF" Cooling Unit 20SA Operation "OFF" INVFAN High Side Equalizer Pipe S1NPH Stop Valve...
  • Page 39 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ72, 96, 120PYDN, PTJU Heating Operation RXYQ72, 96, 120PYDN, PTJU Liquid Pipe Indoor Unit Stop Valve 192pls Fan "OFF" Heating Unit 20SA Operation "OFF" INVFAN High Side Equalizer Pipe S1NPH Stop Valve 192pls Gas Pipe Fan "LL"...
  • Page 40 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ72, 96, 120PYDN, PTJU Cooling Oil Return Operation RXYQ72, 96, 120PYDN, PTJU Liquid Pipe Indoor Unit Stop Valve Fan "ON" Cooling Unit 20SA Operation "ON" INVFAN Theromstat "ON" High Side Equalizer Pipe S1NPH Stop Valve Fan "ON"...
  • Page 41 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ72, 96, 120PYDN, PTJU Heating Oil Return Operation "High temperature, high pressure gas" "High temperature, high pressure liquid" "Low temperature, low pressure" RXYQ72, 96, 120PYDN, PTJU Liquid Pipe Indoor Unit Stop Valve Fan "ON" Heating Unit 20SA...
  • Page 42 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ72, 96, 120PYDN, PTJU (When a single unit is connected) Defrost RXYQ72, 96, 120PYDN, PTJU "High temperature, high pressure gas" "High temperature, high pressure liquid" "Low temperature, low pressure" Liquid Pipe Indoor Unit Stop Valve Fan "OFF"...
  • Page 43 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ144PTJU Cooling Operation One Body Type Indoor Unit Liquid Indoor unit Left Pipe Operation Stop Valve "ON" Fan "ON" 20SA Equalizing Pipe Cooling 20SB Unit Stop Valve Thermostat "ON" Gas Pipe INV2 "ON" TS_A Stop Valve Fan "ON"...
  • Page 44 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ144PTJU Heating Operation One Body Type Indoor Unit Liquid Indoor unit Left Pipe Operation Stop Valve "ON" Fan "ON" 20SA Equalizing Pipe Heating Unit 20SB Stop Valve Gas Pipe Thermostat "ON" INV2 192pls "ON"...
  • Page 45 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ144PTJU Cooling Oil Return Operation One Body Type Indoor Unit Liquid Indoor unit Left Pipe Operation Stop Valve "ON" Fan "ON" 20SA Equalizing Pipe Cooling 20SB Unit Stop Valve Thermostat "ON" Gas Pipe INV2 "ON"...
  • Page 46 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ144PTJU Heating Oil Return Operation One Body Type Indoor Unit Liquid Indoor unit Left Pipe Operation Stop Valve "ON" Fan "ON" 20SA Equalizing Pipe Heating 20SB Unit Stop Valve Thermostat "ON" Gas Pipe Indoor Unit INV2 "ON"...
  • Page 47 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ144PTJU Partial Defrosting 1 (Defrosting in the Right Unit) One Body Type Indoor Unit Indoor Unit Liquid Liquid Indoor unit Left Pipe Pipe Operation Stop Valve 160 pls "ON" Fan "LL" 20SA Equalizing Pipe Heating 20SB...
  • Page 48 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ144PTJU Partial Defrosting 2 (Defrosting in the Left Unit) One Body Type Indoor Unit Indoor Unit Liquid Liquid Indoor unit Left Pipe Pipe Operation Stop Valve 160 pls "ON" In operation of defrosting Fan "LL"...
  • Page 49 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ144, 168, 192, 216, 240PYDN, RXYQ168, 192, 216, 240PTJU Cooling Operation (When multiple units are connected) VRVIII R-410A Heat Pump 60Hz...
  • Page 50 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ144, 168, 192, 216, 240PYDN, RXYQ168, 192, 216, 240PTJU Heating Operation (When multiple units are connected) VRVIII R-410A Heat Pump 60Hz...
  • Page 51 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ144, 168, 192, 216, 240PYDN, RXYQ168, 192, 216, 240PTJU Cooling Oil Return Operation (When multiple units are connected) VRVIII R-410A Heat Pump 60Hz...
  • Page 52 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ144, 168, 192, 216, 240PYDN, RXYQ168, 192, 216, 240PTJU Heating Oil Return Operation (When multiple units are connected) VRVIII R-410A Heat Pump 60Hz...
  • Page 53 Refrigerant Flow for Each Operation Mode SiUS34-801A_b RXYQ144, 168, 192, 216, 240PYDN, RXYQ168, 192, 216, 240PTJU Partial Defrosting 1 (Defrosting in the Right Unit) (When multiple units are connected) VRVIII R-410A Heat Pump 60Hz...
  • Page 54 SiUS34-801A_b Refrigerant Flow for Each Operation Mode RXYQ144, 168, 192, 216, 240PYDN, RXYQ168, 192, 216, 240PTJU Partial Defrosting 2 (Defrosting in the Left Unit) VRVIII R-410A Heat Pump 60Hz...
  • Page 55 Refrigerant Flow for Each Operation Mode SiUS34-801A_b Operation of refrigerant regulator 1. Recovery of refrigerant Surplus refrigerant is recovered to refrigerant regulator by opening of SVL and SVG when the indoor unit load is small. Liquid Pipe Right Pressure regulating valve 20SA S1NPH Equalizing...
  • Page 56: Function General

    SiUS34-801A_b Function General 5. Function General Symbol Symbol Electric symbol Description or function 20SA Four-way valve (Heat exchanger switch) 20SB Y2S (Y9S) Four-way valve (High/low pressure gas pipe switch) – Discharge pipe superheated degree DSHi – Discharge pipe superheat of inverter compressor DSHs –...
  • Page 57: Operation Mode

    Function General SiUS34-801A_b Operation Mode Thermostat ON Operation in stop mode Indoor unit stop or thermostat Operation Pressure egualization mode prior to startup changeover Restart standby Thermostat ON Malfunction/ Rotation Standby Malfunction/ Standby Indoor unit stop or thermostat OFF Pump-down Cooling Heating Thermostat ON...
  • Page 58: Basic Control

    SiUS34-801A_b Basic Control 6. Basic Control Normal Operation 6.1.1 List of Functions in Normal Operation Function of Functional Part (Electric Part Name Symbol Symbol) Normal Cooling Normal Heating Compressor 1 PI control, High pressure protection, PI control, High pressure protection, Low pressure protection, Low pressure protection, ⎯...
  • Page 59: Compressor Pi Control

    Basic Control SiUS34-801A_b Compressor PI Control Compressor PI Control Carries out the compressor capacity PI control to maintain Te at constant during cooling operation and Tc at constant during heating operation to ensure stable unit performance. [Cooling operation] Controls compressor capacity to adjust Te to Te : Low pressure equivalent saturation achieve target value (TeS).
  • Page 60 SiUS34-801A_b Basic Control Compressor Operating Priority Each compressor operates in the following order of priority. INV: Inverter compressor STD1: Standard compressor 1 Pattern 1 RXYQ72P, 96P, 120P RXYQ144PTJU No. 1 No. 2 No. 2 No. 1 STD1 INV2 INV1 RXYQ144PTJU (12 ton) RXYQ72, 96, 120PYDN, PTJU STEP unit 1...
  • Page 61 Basic Control SiUS34-801A_b Compressor Operating Priority Each compressor operates in the following order of priority. In the case of multi-outdoor-unit system, each compressor operates in any of Pattern 1 through Pattern 2 according to the rotation of outdoor units. INV: Inverter compressor STD1: Standard compressor 1 Pattern 1...
  • Page 62: Electronic Expansion Valve Pi Control

    SiUS34-801A_b Basic Control Electronic Expansion Valve PI Control Main electronic expansion valve EVM control When the outdoor unit heat exchanging is performed via the evaporator (20SA is set to ON), this function is used to exert PI control on the electronic expansion valve (Y1E or Y3E) so that the evaporator outlet superheated degree (SH) will become constant.
  • Page 63: Outdoor Unit Fan Control In Cooling Operation

    Basic Control SiUS34-801A_b Outdoor Unit Fan Control in Cooling Operation While in cooling operation, if the outdoor temperature is low, this mode provides high-pressure control using the outdoor unit fan to retain appropriate liquid pressure, thus ensuring refrigerant circulation rate to be supplied to indoor units. Fan step 9 Pc>475.6psi PI control...
  • Page 64: Heat Exchanger Control

    SiUS34-801A_b Basic Control Heat Exchanger Control In case of multi outdoor unit systems, this function is used to ensure condensing and evaporating temperatures by changing over the air heat exchanger of the outdoor unit to the evaporator or the condenser in response to loads while in heating operation. [Multi outdoor unit system] Note 1.
  • Page 65: Special Control

    Special Control SiUS34-801A_b 7. Special Control Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. In addition, to avoid stresses to the compressor due to oil return or else after the startup, the following control is made and the position of the four-way valve is also determined.
  • Page 66: Large Capacity Start Up Control (heating)

    SiUS34-801A_b Special Control 7.1.2 Startup Control in Heating Operation Elect. symbol Startup control Control For any model Actuator Symbol before RXYQ other than that STEP1 STEP2 startup 144PTJU shown on the left 52Hz+OFF+2STEP / Compressor 1 20 sec. — 0 Hz 52 Hz+OFF (Until it reaches Compressor 2...
  • Page 67: Oil Return Operation

    Special Control SiUS34-801A_b conditions of indoor units with thermostat ON, thus maximizing the equipment capacity. Pressure Number of compressors Time Start up STD compressors at intervals of 15 seconds. [Starting conditions] • The system starts heating operation with thermostat ON at a high load. •...
  • Page 68 SiUS34-801A_b Special Control The higher the compressor operating step No., the cumulative refrigerant oil consumption increases. Elect. symbol For any model Outdoor unit actuator Symbol Oil return operation Operation after oil return RXYP other than that 144PTJU shown on the left 52Hz+ON 52Hz+ON Compressor 1...
  • Page 69 Special Control SiUS34-801A_b Cooling indoor unit actuator Oil return operation Thermo ON unit Remote controller setting Unit not in operation Thermo OFF unit Remote controller setting Thermo ON unit Normal opening degree Motorized valve Unit not in operation 192pls Thermo OFF unit Normal opening degree for forced thermostat ON 7.3.2 Heating Oil Return Operation [Start conditions]...
  • Page 70 SiUS34-801A_b Special Control • Pe_min<31.9psi End conditions • After a lapse of 9 min. *1: In case of multi outdoor unit system: Master unit: It conducts the operation listed in the table above. Slave units: Operating units conduct the operation listed in the table above. Non-operating units conduct the operation listed in the table above after the Oil returning process.
  • Page 71: Defrost Operation

    Special Control SiUS34-801A_b Cooling indoor unit actuator Oil return operation Thermo ON unit Remote controller setting Unit not in operation Thermo OFF unit Remote controller setting Thermo ON unit Normal opening degree Motorized valve Unit not in operation 192pls Thermo OFF unit Normal opening degree for forced thermostat ON Heating indoor unit actuator Oil return operation...
  • Page 72 SiUS34-801A_b Special Control Solenoid valve (discharge pipe 0pls 0pls of refrigerant regulator) • 10 min. • 160 sec. • Tb>51.8°F • Pc-Pe>58psi Ending conditions continues for a continues for a period period of consecutive of consecutive 90 sec. 120 sec. 7.4.2 Multi Outdoor Unit System [Start conditions] Referring to the following conditions, start defrost operation.
  • Page 73: Pump-down Residual Operation

    Special Control SiUS34-801A_b Elect. symbol For any model Evaporating outdoor unit actuator Symbol Defrost operation Operation after defrost RXYQ other than that 144PTJU shown on the left Compressor 1 — 210Hz+ON 210Hz+ON Compressor 2 Outdoor unit fan 1 — Fan control Fan control —...
  • Page 74 SiUS34-801A_b Special Control Outdoor unit fan 1 — Fan control Fan control Outdoor unit fan 2 — Electronic expansion valve (Main) 1375 pls 1375 pls Electronic expansion valve 0 pls 0 pls (Subcooling) Electronic expansion valve 80 pls 80 pls (Refrigerant charge) Four-way valve (Heat exchanger 20SA...
  • Page 75: Standby

    Special Control SiUS34-801A_b Four way valve (High/low pressure 20SB gas pipe switch) Solenoid valve (Main bypass) Y10S Solenoid valve (Hot gas) Solenoid valve (Refrigerant regulator liquid pipe) Solenoid valve (Refrigerant regulator gas vent pipe) Solenoid valve (Refrigerant regulator exhaust pipe) Solenoid valve (Refrigerant regulator discharge pipe) •...
  • Page 76: Stopping Operation

    SiUS34-801A_b Special Control Solenoid valve (Refrigerant regulator exhaust pipe) Solenoid valve (Refrigerant regulator discharge pipe) Ending conditions — 2 min. 7.6.2 Crankcase Heater Control In order to prevent the refrigerant from condensing in the compressor oil when in the stopped mode, this mode is used to control the crankcase heater.
  • Page 77 Special Control SiUS34-801A_b 7.7.2 Stop due to Malfunction In order to protect compressors, if any of the following items has an abnormal value, the system will execute a stop with thermostat OFF and the malfunction will be determined according to the number of retry times. Item Judgment Criteria Malfunction Code...
  • Page 78: Protection Control

    SiUS34-801A_b Protection Control 8. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure.
  • Page 79 Protection Control SiUS34-801A_b [Heating Operation] The following control is performed in the entire system. Pc_max indicates the maximum value within the system. Normal Operation Pc_max>479.95psi Pc_max<426.3psi When high pressure is limited Compressor step: 7 STEP down Pc_max After 10 sec. >495.9psi &...
  • Page 80: Low Pressure Protection Control

    SiUS34-801A_b Protection Control Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. [In cooling operation] Because of common low pressure, the following control is performed in the system. Pe_min indicates the minimum value within the system.
  • Page 81 Protection Control SiUS34-801A_b [In heating operation] For multi-outdoor-unit systems, the entire system performs this control in the following sequence. Normal operation • Pe_min>33.35psi Pe_min<24.65psi & • Compressor step=M (See *1) • Pe_min>29psi & • A lapse of 15 sec. Compressor system (See *2): Compressor system (See *2): 2-step down per 10 sec.
  • Page 82: Discharge Pipe Protection Control

    SiUS34-801A_b Protection Control Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against a malfunction or transient increase of discharge pipe temperature. [Contents] The following control is performed for each compressor. [INV compressor] •...
  • Page 83: Inverter Protection Control

    Protection Control SiUS34-801A_b Inverter Protection Control Inverter current protection control and inverter fin temperature control are performed to prevent tripping due to a malfunction, or transient inverter overcurrent, and fin temperature increase. In the case of multi-outdoor-unit system, each INV compressor performs these controls in the following sequence.
  • Page 84 SiUS34-801A_b Protection Control [Inverter fin temperature control] Perform the following control of integrated for each INV compressor. Normal operation Tfin>183.2°F Tfin<177.8°F & INV upper limit frequency=max (210Hz) During the control of fin temperature protection INV Comp. upper limit step: 1-step down Tfin>183.2°F 10 seconds Current status...
  • Page 85: Std Compressor Overload Protection

    Protection Control SiUS34-801A_b STD Compressor Overload Protection This control is used to prevent abnormal heating due to overcurrent to the compressor resulting from failures of the STD compressor, such as locking. STD compressor ON *If the power supply is reset while in operation prohibition mode, the prohibition Demand to operate.
  • Page 86: Other Control

    SiUS34-801A_b Other Control 9. Other Control Backup Operation If any of the compressors malfunctions, disable the relevant corresponding compressor or outdoor unit, and then conduct emergency operation only with operational compressors or outdoor units. Emergency operation with remote controller reset and Emergency operation with outdoor unit PC board setting are available.
  • Page 87: Test Operation

    Test Operation SiUS34-801A_b 10.Test Operation 10.1 Installation Process The following Figure shows the installation process. Install in the order of the steps shown: 3. Selection of Location 4. Inspecting and Handling the Unit 5. Placing the Unit 7. Field Wiring 6.
  • Page 88: Procedure And Outline

    SiUS34-801A_b Test Operation 10.2 Procedure and Outline Use the following procedure to conduct the initial test operation after installation: 10.2.1 Check Work Prior to Turn Power Supply On Is the wiring installed as specified? Check the below items. Is designated wiring used? 2Power wiring Is the wiring screw tight? 2Control transmission wiring...
  • Page 89 Test Operation SiUS34-801A_b Is a correct quantity of refrigerant charged? Check on amount of refrigerant The following method is available for additional charging of charge refrigerant. (1) Calculate additional refrigerant quantity. • Calculate a necessary additional refrigerant charging amount according to the procedure for calculation shown below.
  • Page 90 SiUS34-801A_b Test Operation 10.2.2 Turn Power On Be sure to turn the power on 6 hours before starting operation to power Turn outdoor unit and indoor on the crankcase heater. This protects the compressors. unit power on. Check to be sure the transmission is normal. Check the LED display of the The transmission is normal if the LEDs display conditions are as shown outdoor unit PC board.
  • Page 91 Test Operation SiUS34-801A_b 10.2.3 Air Tight Test and Vacuum Drying After finishing piping work, carry out airtight test and vacuum drying. Note: Always use nitrogen gas for the airtightness test. Absolutely do not open the shutoff valve until the main power circuit insulation measurement has been completed.
  • Page 92 SiUS34-801A_b Test Operation Note: The air-tightness test and vacuum drying should be done using the service ports of equalizer pipe, HP/LP gas pipe, suction gas pipe and liquid pipe shutoff valve. See the [R-410A] Label attached to the front plate of the outside unit for details on the location of the service port (see figure at right) [R-410A] Label...
  • Page 93 Test Operation SiUS34-801A_b If there is a possibility that condensation on the shutoff valve might drip down into the indoor unit through gaps in the insulation and piping because the outside unit is located higher than the indoor unit, it can be prevented by caulking the connections. (Refer to figure 26) The piping lead-out hole lid should be attached after opening a knockout hole.
  • Page 94 SiUS34-801A_b Test Operation Stand the tank upright and charge. (The siphon pipe goes all the way inside, so the tank does not need be put upside-down charge in liquid form.) Other tanks Stand the tank upside-down and charge. Note: Always use the proper refrigerant (R-410A). If charged with refrigerant containing an improper material, it may cause an explosion or accident.
  • Page 95 Test Operation SiUS34-801A_b [Shutoff valve operation procedure] When operating the shutoff valve, use the following procedure. Note: Do not open the shutoff valve until 10.2.1 Check Work Prior to Turn Power Supply On is completed. If the shutoff valve is left open without turning on the power, it may cause refrigerant to buildup in the compressor, leading to insulation degradation.
  • Page 96 SiUS34-801A_b Test Operation <Tightening torque> Tightening torque ft · lbf (Turn clockwise to close) Shutoff valve size Shaft (valve body) Cap (valve lid) Service port φ 3/8 3.98 - 4.87 9.95 - 12.17 Hexagonal wrench φ 1/2 5.97 - 7.30 13.3 - 16.2 8.48 - 10.3 φ...
  • Page 97 Test Operation SiUS34-801A_b 10.2.5.2Procedure of Adding Refrigerant charging and check operation WARNING Electric Shock Warning Make sure to close the Electrical Components Box lid before turning on the power. Perform the setting on the PC-board (A1P) of the outside unit and check the LED display after the power is on via the inspection door which is in the Electrical Components Box lid.
  • Page 98 SiUS34-801A_b Test Operation When the unit is shipped from the factory, the unit’s internal piping is already charged with refrigerant, so be careful when connecting the charge hose. After adding the refrigerant, make sure to close the lid of the refrigerant charging port. The tightening torque for the lid is 8.48 to 10.3 ft ·...
  • Page 99 Test Operation SiUS34-801A_b Charge hose Refrigerant charge port Outside unit A Gas pipe shutoff valve Liquid pipe shutoff valve Valve B Measuring device Valve C R-410A tank (with siphon) Valve A : Field pipings : Shutoff valve Indoor unit : Refrigerant flow : Service port <...
  • Page 100 SiUS34-801A_b Test Operation The refrigerant will be charged about 66 lb in one hour at outdoor temp. 86°FDB (26 lb at 32°FDB). (According to outdoor temp. or the refrigerant amount in the tank, the charging rate may speed up). If you need to speed up in case of multi system, connect Charge hose the refrigerant tanks to each outside unit.
  • Page 101 Test Operation SiUS34-801A_b (4) Push the TEST button (BS4) once. (The LED displays will change as shown below.) H1P H2P H3P H4P H5P H6P H7P (5) Hold the TEST button (BS4) down for 5 seconds or more. (The LED displays will change as shown below and fan of outside unit will start rotation.) H1P H2P H3P H4P H5P H6P H7P ∗...
  • Page 102 SiUS34-801A_b Test Operation Notes (*1)~(*9) (*1) Lead the refrigerant charge hose from the pipe intake. All front panels must be closed at procedure (7). (*2) • If you perform the refrigerant charging operation within a refrigerant system that has the power off to one or more units, the operation cannot finish properly.
  • Page 103 Test Operation SiUS34-801A_b 10.2.5.4Procedure of check operation Perform the following Check Operation procedures or malfunction code [U3] will be displayed in the remote controller and normal operation can not be carried out. Check of shutoff valve opening Check of miswiring Judgment of piping length Check of refrigerant overcharge Note:...
  • Page 104 SiUS34-801A_b Test Operation [Remote controller displays malfunction code] Malfunction code Installation error Remedial action E3, E4 F3, F6 The shutoff valve of the outside unit is left closed. Open the shutoff valve. The phases of the power to the outside unit is Exchange two of the three phases (L1, L2, L3) to make a proper reversed.
  • Page 105 Test Operation SiUS34-801A_b 10.2.7.2 Test Run After all works are completed, operate the unit normally and check the following: (1) Make sure the indoor and outside units are operating normally. (2) Operate each indoor unit one by one and make sure the corresponding outside unit is also operating.
  • Page 106: Operation When Power Is Turned On

    SiUS34-801A_b Test Operation Note: Heating is not possible if the outdoor temperature is 75°F or higher. Refer to the Operation manual. If a knocking sound can be heard in the liquid compression of the compressor, stop the unit immediately and then energize the crank case heater for a sufficient length of time before restarting the operation.
  • Page 107 Test Operation SiUS34-801A_b 10.3.3 When an Indoor Unit or Outdoor Unit has been Added, or Indoor or Outdoor Unit PC Board has been Changed Be sure to push and hold the RESET button for 5 seconds. If not, the addition cannot be recognized.
  • Page 108: Outdoor Unit Pc Board Layout

    SiUS34-801A_b Outdoor Unit PC Board Layout 11.Outdoor Unit PC Board Layout Outdoor unit PC board (2) Set mode display (LED) (3) Mode setting switch H1P H2P H3P H4P H5P H6P H7P H8P 1 2 3 4 1 2 3 4 MODE RETURN TEST...
  • Page 109: Field Settings

    Field Settings SiUS34-801A_b 12.Field Settings 12.1 Field Settings on the Outdoor Unit 12.1.1 Field Settings on the Outdoor Unit List of Field Setting Items This following section indicates the list of field setting items. For the lists of dip switch contents, Setting mode 1, and Setting mode 2, refer to information in tables shown on the following page onward.
  • Page 110 SiUS34-801A_b Field Settings Overview of setting procedure Reference Setting item Content and objective of setting page Indoor unit 101~104 Used to operate the indoor unit in the fan forced H Set No. 5 of [Setting mode 2] to indoor stopped state in forced H operation operation unit forced fan H.
  • Page 111 Field Settings SiUS34-801A_b Do not make any changes in all factory settings of the DIP switches on the control PC board. Status of DIP switches : Represents the factory setting positions of the switches. 1 2 3 4 1 2 3 4 Setting at replacement by spare PC board Caution DIP switch Setting after changing the main PC board(A1P) to spare parts PC board...
  • Page 112 Set DS1-4, DS2-1, DS2-2 and DS2-3 to ON. RXYQ72PYDN 1 2 3 4 1 2 3 4 HEAT PUMP Set DS1-4, DS2-1 and DS2-4 to ON. RXYQ96PYDN 1 2 3 4 1 2 3 4 HEAT PUMP Set DS1-4, DS2-1, DS2-2 and DS2-4 to ON. RXYQ120PYDN...
  • Page 113 Field Settings SiUS34-801A_b Single-outdoor-unit system Outdoor- Master multi Slave 1 system Pushbutton switches MODE RETURN TEST REWIRING Used for Used to set up address onsite setting when wiring is changed or an indoor unit is added Used to change Used for check operation and the setting mode test operation There are the following three setting modes.
  • Page 114 SiUS34-801A_b Field Settings Mode changing procedure 2 (Set): Select mode with BS2 (SET button) in each selection step. Setting mode 1 Press BS1 (MODE button) for more than 5 sec. Press BS1(MODE button). (Initial condition) Monitor mode Setting mode 2 Setting item selection Check item selection (SET button)
  • Page 115 Field Settings SiUS34-801A_b a. Setting mode 1 This mode is used to set and check the following items. Check items ··········· The following items can be checked. (1) Current operating conditions (Normal / Abnormal / In check operation) (2) Low noise operating conditions (In normal operation / In low noise operation) (3) Demand operating conditions (In normal operation / In demand operation) Procedure for checking check items The system is normally set to "Setting...
  • Page 116 SiUS34-801A_b Field Settings Setting item Description b. “Setting mode 2” Used to make setting of contents to display on the digital Digital pressure pressure gauges (e.g. pressure sensors and temperature gauge kit display sensors) Push and hold the MODE (BS1) button for 5 seconds and set to Cool/heat unified Sets address for cool/heat unified operation.
  • Page 117 Field Settings SiUS34-801A_b Setting item Description Emergency operation (Setting for the unit 1 operation prohibition in multi- outdoor-unit system) Emergency operation Used to temporarily prohibit the applicable outdoor unit (Setting for the unit from operating should there be any faulty part in multi- 2 operation outdoor-unit system.
  • Page 118 SiUS34-801A_b Field Settings Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory set 8777777 ∗ Address 8777778 Binary number Digital pressure gauge kit display (4 digits) 8778888 8777777 ∗ Address Binary number 8777778 Cool / Heat Unified address...
  • Page 119 Field Settings SiUS34-801A_b Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory set 8777777 ∗ Level 1 (outdoor fan with 6 step or 8777778 Night-time low noise setting Level 2 (outdoor fan with 5 step or 8777787 Level 3 (outdoor fan with 4 step or 8777788...
  • Page 120 SiUS34-801A_b Field Settings c. Monitor mode LED display Setting item Data display To enter the monitor mode, push the 9 7 7 7 7 7 7 Various settings Lower 4 digits MODE (BS1) button when in “Setting mode 1”. 9 7 7 7 7 7 8 C/H unified address 9 7 7 7 7 8 7 Low noise/demand address...
  • Page 121 Field Settings SiUS34-801A_b Setting item 0 Display contents of “Number of units for various settings” EMG operation / 9 7 7 8 7 7 7 backup operation setting 9 7 7 7 7 7 7 Defrost select setting Short 9 7 7 7 8 7 7 Medium 9 7 7 7 9 7 7 Long...
  • Page 122 SiUS34-801A_b Field Settings the low-noise operation input terminal on the terminal block (X1M). (Refer to the figure shown below.) 2. While in [Setting mode 2] , set the setting condition for set item No. 12 (Setting of external low noise/demand operation) to "YES". 3.
  • Page 123 Field Settings SiUS34-801A_b Image of operation in the case of A Operation sound Rated operation sound Operation sound of Approx. 55 db (target) level 1 Operation sound of Approx. 50 db (target) level 2 Operation sound of level 3 Approx. 45 db (target) Note1: Above values are reference only (measured in silent room) Note2: Above values are for 1 module only.
  • Page 124 SiUS34-801A_b Field Settings Setting of Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition. Description of setting Setting procedure Setting External control...
  • Page 125 Field Settings SiUS34-801A_b Image of operation in the case of A Power consumption The power Rated power consumption consumption during 80 % of rated power consumption the demand level 1 Demand level 1 instructing Demand level 2 instructing Demand level 3 instructing 70 % of rated power consumption instructing can be 60 % of rated power consumption...
  • Page 126 SiUS34-801A_b Field Settings Detailed Setting Procedure of Low Noise Operation and Demand Control 1. Setting mode 1 (H1P off) In setting mode 2, push the BS1 (MODE button) one time. → Setting mode 2 is entered and H1P lights. During the setting mode 1 is displayed, “In low noise operation” and “In demand control” are displayed.
  • Page 127 Field Settings SiUS34-801A_b 12.1.5 Setting of Refrigerant Recovery Mode When carrying out the refrigerant collection on site, fully open the respective expansion valve of indoor and outdoor units. All indoor and outdoor unit’s operation are prohibited. [Operation procedure] In setting mode 2 with units in stop mode, set “Refrigerant Recovery / Vacuuming mode” to ON.
  • Page 128 SiUS34-801A_b Field Settings 12.1.7 Check Operation Detail CHECK OPERATION FUNCTION (Press the MODE button BS1 once and set to SETTING MODE 1 (H1P: OFF)) LED display (H1P~H7P) ( BLINK) Unit stopping 3383333 Press the TEST button for 5 seconds. Step 1 Pressure equalizing 3933338 10 sec to 10 minutes...
  • Page 129 Field Settings SiUS34-801A_b • Automatically disable the defective outdoor unit from operating, and then operate other outdoor units. • The following section shows malfunction codes on which this emergency operation is possible. E3, E4, E5 J2, J3, J5, J6, J7, J9, JA, JC L3, L4, L5, L8, L9, LC U2, UJ O Emergency operation by setting outdoor unit PC board...
  • Page 130 SiUS34-801A_b Field Settings <RXYQ72, 96, 120PYDN, PTJU, RXYQ144PTJU> Disabling the compressor 1 (INV or INV1) from operating: Set No. 38 of setting mode 2 to Disable-compressor-1 operation. LED display ( : ON, : OFF, : Blink) (Step) H1P-----------H7P (1) Press and hold the MODE button (BS1) 8111111 for 5 sec.
  • Page 131 Field Settings SiUS34-801A_b (5) Press the RETURN button (BS3) twice. 8111111 (6) Press the MODE button (BS1) once. 1181111 [Cancel of Emergency Operation] To cancel the emergency operation, conduct the following setting. (Return to Factory setting.) <RXYQ72, 96, 120PYDN, PTJU, RXYQ144PTJU> Cancel disabling the compressor 1 (INV or INV1) from operating: Set No.
  • Page 132 SiUS34-801A_b Field Settings <RXYQ144, 168, 192, 216, 240PYDN, RXYQ168, 192, 216, 240PTJU> Cancel the disable-operation setting by each outdoor unit. Make the following setting on the outdoor unit 1. If this setting is made on an outdoor unit other than the outdoor unit 2, the setting will become invalid.
  • Page 133 Field Settings SiUS34-801A_b VRVIII R-410A Heat Pump 60Hz...
  • Page 134 SiUS34-801A_b Part 3 VRVIII R-410A Heat Recovery 60Hz 1. Specifications ..................121 1.1 Outdoor Units ................... 121 1.2 BS Units ....................126 2. Refrigerant Circuit ...................128 2.1 REYQ72, 96, 120PYDN, PTJU ..............128 2.2 REYQ144PTJU ..................130 2.3 REMQ72PYDN, PTJU (Multi 6ton)............132 2.4 REMQ96, 120PYDN, PTJU (Multi 8, 10ton)..........
  • Page 135: Vrviii R-410a Heat Recovery 60hz119

    SiUS34-801A_b 8.5 STD Compressor Overload Protection............. 216 9. Other Control...................218 9.1 Backup Operation..................218 9.2 Demand Operation ................... 218 9.3 Heating Operation Prohibition ..............218 10.Test Operation ..................219 10.1 Installation Process .................. 219 10.2 Procedure and Outline ................219 10.3 Operation when Power is Turned On ............238 11.Outdoor Unit PC Board Layout ...............240 12.Field Setting ....................241 12.1 Field Setting from Outdoor Unit..............
  • Page 136: Specifications

    SiUS34-801A_b Specifications 1. Specifications Outdoor Units Heat Recovery 60Hz <REYQ-PYDN> 460V Model Name REYQ72PYDN REYQ96PYDN REYQ120PYDN Power Supply 3 Phase 60Hz 460V 3 Phase 60Hz 460V 3 Phase 60Hz 460V 1 Cooling Capacity Btu / h 72,000 96,000 120,000 2 Heating Capacity Btu / h 81,000 108,000...
  • Page 137 Specifications SiUS34-801A_b Heat Recovery 60Hz <REYQ-PYDN> 460V Model Name (Combination Unit) REYQ144PYDN REYQ168PYDN REYQ192PYDN REMQ72PYDN REMQ72PYDN REMQ72PYDN Model Name (Independent Unit) REMQ72PYDN REMQ96PYDN REMQ120PYDN Power Supply 3 Phase 60Hz 460V 3 Phase 60Hz 460V 3 Phase 60Hz 460V 1 Cooling Capacity Btu / h 144,000 168,000...
  • Page 138: Specifications

    SiUS34-801A_b Specifications Heat Recovery 60Hz <REYQ-PYDN> 460V Model Name (Combination Unit) REYQ216PYDN REYQ240PYDN REMQ96PYDN REMQ120PYDN Model Name (Independent Unit) REMQ120PYDN REMQ120PYDN Power Supply 3 Phase 60Hz 460V 3 Phase 60Hz 460V 1 Cooling Capacity Btu / h 216,000 240,000 2 Heating Capacity Btu / h 243,000 270,000...
  • Page 139 Specifications SiUS34-801A_b Heat Recovery 60Hz <REYQ-PTJU> 230V Model Name REYQ72PTJU REYQ96PTJU REYQ120PTJU Power Supply 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 1 Cooling Capacity Btu / h 72,000 96,000 120,000 2 Heating Capacity Btu / h 81,000 108,000 135,000...
  • Page 140 SiUS34-801A_b Specifications Heat Recovery 60Hz <REYQ-PTJU> 230V Model Name (Combination Unit) REYQ144PTJU REYQ168PTJU REYQ192PTJU REMQ72PTJU REMQ72PTJU Model Name (Independent Unit) — REMQ96PTJU REMQ120PTJU Power Supply 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 1 Cooling Capacity Btu / h 144,000 168,000...
  • Page 141: Bs Units

    Specifications SiUS34-801A_b Heat Recovery 60Hz <REYQ-PTJU> 230V Model Name (Combination Unit) REYQ216PTJU REYQ240PTJU REMQ96PTJU REMQ120PTJU Model Name (Independent Unit) REMQ120PTJU REMQ120PTJU Power Supply 3 Phase 60Hz 208V-230V 3 Phase 60Hz 208V-230V 1 Cooling Capacity Btu / h 216,000 240,000 2 Heating Capacity Btu / h 243,000 270,000...
  • Page 142 SiUS34-801A_b Specifications Mass 26 (11.8 kg) 26 (11.8 kg) (kg) Installation Manual, Attached Pipe, Insulation Pipe Cover, Installation Manual, Attached Pipe, Insulation Pipe Cover, Standard Accessories Clamps Clamps Drawing No. 4D058233A 4D058234A Note: 1 In case of connecting with a 07~18 type indoor unit, match to the size of field pipe using the attached pipe. (Connection between the attached pipe and the field pipe must be brazed.) 2 In case of connecting with indoor unit capacity index 54 or more and 60 or less, match to the size of the field pipe using the attached pipe.
  • Page 143: Refrigerant Circuit

    Refrigerant Circuit SiUS34-801A_b 2. Refrigerant Circuit REYQ72, 96, 120PYDN, PTJU No. in refrigerant Symbol Name Major Function system diagram Inverter compressor (INV) Inverter compressor is operated on frequencies between 52Hz and 210Hz by using the inverter, while Standard compressor is operated with commercial power supply only. The number of operating steps is as follows when Inverter compressor is operated in Standard compressor 1 (STD1) combination with Standard compressor: REYQ8, 10, 12P : 37 steps...
  • Page 144 SiUS34-801A_b Refrigerant Circuit REYQ72, 96, 120PYDN, PTJU (6ton, 8ton, 10ton Single Type) (INV Unit + STD Unit) Liquid Subcool Heat Exchanger 2 Pipe Left Stop Valve Heat Exchanger 2 Dual Pressure Gas Pipe Stop Valve S2PH Suction Pipe Stop Valve Subcool Heat Exchanger 1 Right Heat Exchanger 1...
  • Page 145: Reyq144ptju

    Refrigerant Circuit SiUS34-801A_b REYQ144PTJU No. in refrigerant Symbol Name Major Function system diagram Inverter compressor (INV1) Inverter compressor is operated on frequencies between 52Hz and 266Hz by using the inverter. The number of operating steps is as follows. REYQ14P or 16P : 26 step Standard compressor 1 (INV2) Since the system is of the outdoor unit heat exchanging type, the fan is operated at 9- Inverter fan...
  • Page 146 SiUS34-801A_b Refrigerant Circuit REYQ144PTJU (12ton Single Type) (INV Unit × 2) Liquid Subcool Heat Exchanger 2 Pipe Left Stop Valve Heat Exchanger 2 Dual Pressure Gas Pipe Stop Valve S2PH INV2 Suction Pipe Stop Valve Subcool Heat Exchanger 1 Liquid Pipe Right Heat Exchanger 1 Gauge Port...
  • Page 147: Remq72pydn, Ptju (multi 6ton)

    Refrigerant Circuit SiUS34-801A_b REMQ72PYDN, PTJU (Multi 6ton) No. in refrigerant Symbol Name Major Function system diagram Inverter compressor is operated on frequencies between 52Hz and 210Hz by using the Inverter compressor (INV) inverter. Compressor operation steps : Refer to page 190. Since the system is of the outdoor unit heat exchanging type, the fan is operated at 9-step Inverter fan rotation speed by using the inverter.
  • Page 148 SiUS34-801A_b Refrigerant Circuit REMQ72PYDN, PTJU Stop Valve Liquid Pipe S1NPH Stop Valve Equalizing Pipe Stop Valve Dual Pressure Gas Pipe S1PH S2NPL Gauge Port Stop Valve Suction Pipe VRVIII R-410A Heat Recovery 60Hz...
  • Page 149: Remq96, 120pydn, Ptju (multi 8, 10ton)

    Refrigerant Circuit SiUS34-801A_b REMQ96, 120PYDN, PTJU (Multi 8, 10ton) No. in refrigerant Name Major Function Symbol system diagram Inverter compressor (INV) Inverter compressor is operated on frequencies between 52Hz and 210Hz by using the inverter, while Standard compressor is operated with commercial power supply only.
  • Page 150 SiUS34-801A_b Refrigerant Circuit REMQ96, 120PYDN, PTJU Stop Valve Liquid Pipe S1NPH Stop Valve Equalizing Pipe Stop Valve Dual Pressure Gas Pipe S1PH S2PH S2NPL Gauge Port Stop Valve Suction Pipe VRVIII R-410A Heat Recovery 60Hz...
  • Page 151: Bs Unit Functional Parts

    Refrigerant Circuit SiUS34-801A_b BS Unit Functional Parts BSVQ36, 60PVJU Name Symbol Function Electronic expansion valve (EVH) Opens while in heating operation or all indoor units are in cooling operation. (Max : 760pls) Electronic expansion valve (EVL) Opens while in cooling operation. (Max : 760pls) Electronic expansion valve (EVHS) Opens while in heating operation or all indoor units are in cooling operation.
  • Page 152: Functional Parts Layout

    SiUS34-801A_b Functional Parts Layout 3. Functional Parts Layout REYQ72P, 96P, 120P Plan Front View COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE COIL FOR EXPANSION VALVE Note: For reference numbers, refer to page 128. VRVIII R-410A Heat Recovery 60Hz...
  • Page 153: Reyq144ptju

    Functional Parts Layout SiUS34-801A_b REYQ144PTJU Plan Front View Note: For reference numbers, refer to page 130. VRVIII R-410A Heat Recovery 60Hz...
  • Page 154: Remq72p

    SiUS34-801A_b Functional Parts Layout REMQ72P Plan REFRIGERANT REGULATOR Front View GROUND WIRE Note: For reference numbers, refer to page 132. VRVIII R-410A Heat Recovery 60Hz...
  • Page 155: Remq96p, 120p

    Functional Parts Layout SiUS34-801A_b REMQ96P, 120P Plan REFRIGERANT REGULATOR Front View ZGROUND WIRE Note: For reference number, refer to page 134. VRVIII R-410A Heat Recovery 60Hz...
  • Page 156: Refrigerant Flow For Each Operation Mode

    SiUS34-801A_b Refrigerant Flow for Each Operation Mode 4. Refrigerant Flow for Each Operation Mode REYQ72P, 96P, 120P Cooling Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 157 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ72P, 96P, 120P Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 158 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ72P, 96P, 120P Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 159 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ72P, 96P, 120P Cooling Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 160 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ72P, 96P, 120P Heating Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 161 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ72P, 96P, 120P Oil Return Operation at Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 162 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ72P, 96P, 120P Partial Defrosting 1 (Defrosting in the Right Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 163 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ72P, 96P, 120P Partial Defrosting 2 (Defrosting in the Left Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 164 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PTJU Cooling Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 165 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PTJU Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 166 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PTJU Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 167 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PTJU Cooling Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 168 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PTJU Heating Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 169 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PTJU Oil Return Operation at Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 170 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PTJU Partial Defrosting 1 (Defrosting in the Right Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 171 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PTJU Partial Defrosting 2 (Defrosting in the Left Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 172 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PYDN Cooling Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 173 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PYDN Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 174 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PYDN Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 175 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PYDN Cooling Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 176 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PYDN Heating Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 177 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PYDN Oil Return Operation at Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 178 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ144PYDN Partial Defrosting 1 (Defrosting in the Right Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 179 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ144PYDN Partial Defrosting 2 (Defrosting in the Left Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 180 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ168P, 192P Cooling Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 181 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ168P, 192P Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 182 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ168P, 192P Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 183 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ168P, 192P Cooling Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 184 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ168P, 192P Heating Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 185 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ168P, 192P Oil Return Operation at Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 186 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ168P, 192P Partial Defrosting 1 (Defrosting in the Right Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 187 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ168P, 192P Partial Defrosting 2 (Defrosting in the Left Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 188 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ216P, 240P Cooling Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 189 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ216P, 240P Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 190 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ216P, 240P Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 191 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ216P, 240P Cooling Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 192 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ216P, 240P Heating Oil Return Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 193 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ216P, 240P Oil Return Operation at Simultaneous Cooling / Heating Operation VRVIII R-410A Heat Recovery 60Hz...
  • Page 194 SiUS34-801A_b Refrigerant Flow for Each Operation Mode REYQ216P, 240P Partial Defrosting 1 (Defrosting in the Right Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 195 Refrigerant Flow for Each Operation Mode SiUS34-801A_b REYQ216P, 240P Partial Defrosting 2 (Defrosting in the Left Unit) VRVIII R-410A Heat Recovery 60Hz...
  • Page 196 SiUS34-801A_b Refrigerant Flow for Each Operation Mode Operation of refrigerant regulator 1. Recovery of refrigerant Surplus refrigerant is recovered to refrigerant regulator by opening of SVL and SVG when the indoor unit load is small. Liquid Pipe Right Pressure regulating valve 20SA S1NPH Equalizing...
  • Page 197 Refrigerant Flow for Each Operation Mode SiUS34-801A_b 3. Pressure regulating valve (Refrigerant regulator) The circuit will be closed when SVL, SVO, SVG are all closed. In this case, the increased pressure in the refrigerant regulator will be transferred to the liquid refrigerant pipe side, to regulate the pressure.
  • Page 198 SiUS34-801A_b Refrigerant Flow for Each Operation Mode Pressure equalizing when switching operation cooling/ heating 1. When switching operation from to cooling to heating First, the electric expansion valves for EVHS, EVH, EVL and EVLS of the indoor unit will be closed.
  • Page 199 Refrigerant Flow for Each Operation Mode SiUS34-801A_b 2. When switching operation from heating to cooling First, the electric expansion valve and the solenoid valve for EVHS, EVH, EVL and EVLS of the indoor unit will be closed. Next, open the EVLS, and it makes to balance the system pressure. Finally, EVL and EVLS are opened and the electric expansion valve of the indoor unit is opened to start the operation as a cooling circuit.
  • Page 200: Function General

    SiUS34-801A_b Function General 5. Function General Symbol Electric symbol Symbol Description or function REYQ72, 96, 120P REMQ72, 96, 120P REYQ144PTJU (Heat exchanger1) 20SA Four-way valve (Heat exchanger switch) (Heat exchanger2) 20SB Four-way valve (High/low pressure gas pipe switch) – – Discharge pipe superheated degree DSHi –...
  • Page 201 Function General SiUS34-801A_b Electric symbol Symbol Description or function REYQ72, 96, 120P REMQ72, 96, 120P REYQ144PTJU R1T (A1P) R1T (A1P) Outdoor air temperature R8T (Suction pipe1) Suction pipe temperature R10T (Suction pipe2) (Deicer1) Heat exchanger outlet temperature at cooling R12T (Deicer2) (Gas pipe1) Heat exchanger gas pipe temperature...
  • Page 202: Operation Mode

    SiUS34-801A_b Function General Operation Mode Thermostat ON Operation in stop mode Indoor unit stop or thermostat Operation Pressure egualization mode prior to startup changeover Restart standby Thermostat ON Malfunction/ Rotation Standby Malfunction/ Standby Indoor unit stop or thermostat OFF Pump-down Cooling Heating Thermostat ON...
  • Page 203: Basic Control

    Basic Control SiUS34-801A_b 6. Basic Control Normal Operation 6.1.1 List of Functions in Normal Operation (Electric Function of Functional Part Symbol) Part Name Symbol Normal Simultaneous Normal Cooling Normal Heating REYQ REMQ Cooling / Heating PI control, High PI control, High PI control, High Compressor 1 M1C M1C...
  • Page 204: Compressor Pi Control

    SiUS34-801A_b Basic Control *1 and 2 : Refer to Chapter 6: Control of Electonic Expansion Valve on page 293. Electric Normal heating / Normal simultaneous Cooling / BS unit actuator Normal cooling symbol Heating operation Electronic expansion valve (EVH) 760 pls (fully opened) 760 pls (fully opened) Electronic expansion valve (EVL) 760 pls (fully opened)
  • Page 205 Basic Control SiUS34-801A_b Operating Priority and Rotation of Compressors Each compressor operates in the following order of priority. INV: Inverter compressor In the case of multi-outdoor-unit system, each compressor operates in any of Pattern 1 STD1: Standard compressor 1 through Pattern 3 according to the rotation of outdoor units. STD2: Standard compressor 2 Pattern 1 Pattern 2...
  • Page 206 SiUS34-801A_b Basic Control Compressors. Single unit installation REYQ144PTJU (12 ton) REYQ72, 96, 120PYDN, PTJU (To increase Step No.) STEP STD1 STEP unit 1 unit 2 Initial step 52Hz 56Hz 52Hz 52Hz Initial step 62Hz 56Hz 56Hz 68Hz 62Hz 62Hz 74Hz 66Hz 66Hz 80Hz...
  • Page 207 Basic Control SiUS34-801A_b Two-unit multi system REYQ144PYDN (6/6 ton) REYQ168PYDN, 192PYDN (6+8/10 ton) (To increase Step No.) (To decrease Step No.) (To increase Step No.) (To decrease Step No.) STEP unit 1 unit 2 STEP unit 1 unit 2 STEP unit 1 unit 2 STEP...
  • Page 208: Electronic Expansion Valve Pi Control

    SiUS34-801A_b Basic Control Two-unit multi system REYQ216PYDN, 240PYDN (8/10+10 ton) (To increase Step No.) (To decrease Step No.) STEP unit 1 unit 2 STEP unit 1 unit 2 52Hz 52Hz Initial step 52Hz 56Hz 56Hz 56Hz 62Hz 62Hz 62Hz 66Hz 66Hz 68Hz 70Hz...
  • Page 209: Step Control Of Outdoor Unit Fans

    Basic Control SiUS34-801A_b function is used to exert PI control on the electronic expansion valve (Y1E or Y3E) so that the evaporator outlet superheated degree (SH) will become constant. SH = Tg - Te SH : Evaporator outlet superheated degree (°F) Tg : Suction pipe temperature (°F) detected by the heat exchanger gas pipe thermistor R2T.
  • Page 210: Heat Exchanger Control

    SiUS34-801A_b Basic Control circulation rate to be supplied to indoor units. Fan step 9 Pc>475.6psi PI control Fan step 8 PI control Pc>461.1psi Fan step 7 Pc>446.6psi PI control Lapse of 20 sec. PI control Hold the current -1 step on +1 step on step on outdoor outdoor unit fan...
  • Page 211 Basic Control SiUS34-801A_b [Multi outdoor unit system] Note 1. "GR" is a numeric value representing the current balanced Outdoor unit condition and calculated from target condensing temperature, target evaporating temperature, current condensing Condenser Condenser temperature, and current evaporating temperature. Note 2. On the system with two outdoor units, if there is no step for the GR >...
  • Page 212: Special Control

    SiUS34-801A_b Special Control 7. Special Control Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. In addition, to avoid stresses to the compressor due to oil return or else after the startup, the following control is made and the position of the four way valve is also determined.
  • Page 213: Large Capacity Start Up Control (heating)

    Special Control SiUS34-801A_b 7.1.2 Startup Control in Heating Operation Elect. Control Startup control symbol Actuator Symbol before startup STEP1 STEP2 REYQ REMQ Compressor 1 M1C M1C 52Hz+OFF+2STEP / 20 sec. — 0 Hz 52 Hz+OFF (Until it reaches Pc-Pe>56.55 psi) Compressor 2 M2C M2C 20SA=ON: STEP7...
  • Page 214: Oil Return Operation

    SiUS34-801A_b Special Control conditions of indoor units with thermostat ON, thus maximizing the equipment capacity. Pressure Number of compressors Time Start up STD compressors at intervals of 15 seconds. [Starting conditions] •The system starts heating operation with thermostat ON at a high load. •The system completes defrosting operation.
  • Page 215 Special Control SiUS34-801A_b The higher the compressor operating step No., the cumulative refrigerant oil consumption increases. Elect. symbol Outdoor unit actuator Symbol Oil return operation Operation after oil return REYQ REMQ 52Hz+ON 52Hz+ON Compressor 1 (Subsequently, constant low (Subsequently, constant low pressure control) pressure control) —...
  • Page 216 SiUS34-801A_b Special Control Cooling indoor unit actuator Oil return operation Thermo ON unit Remote controller setting Unit not in operation Thermo OFF unit Remote controller setting Thermo ON unit Normal opening degree Motorized valve Unit not in operation 192pls Thermo OFF unit Normal opening degree for forced thermostat ON Cooling BS unit actuator Elect.
  • Page 217 Special Control SiUS34-801A_b 7.3.2 Heating Oil Return Operation (including cooling / heating simultaneous operation) [Start conditions] Referring to the following conditions, start heating oil return operation. • Integral oil rise rate is reached to specified level. • When cumulative compressor operating time exceeds 8 hours (2 hours when the power supply turns ON for the first time) Furthermore, the integral oil rise rate is calculated by Tc, Te, and compressor loads.
  • Page 218: Defrost Operation

    SiUS34-801A_b Special Control Cooling indoor unit actuator Oil return operation Thermo ON unit Remote controller setting Unit not in operation Thermo OFF unit Remote controller setting Thermo ON unit Normal opening degree Motorized valve Unit not in operation 192pls Thermo OFF unit Normal opening degree for forced thermostat ON Heating indoor unit actuator Oil return operation...
  • Page 219 Special Control SiUS34-801A_b Electronic expansion valve Y5E Y3E SH control 0pls (subcooling) Electronic expansion valve Y4E Y2E 80pls 80pls (refilling refrigerant) SVE Y5S Solenoid valve (main bypass) Y6S ON Y10S Solenoid valve (hot gas) SVP Y4S Y5S OFF Solenoid valve (liquid pipe of Y3S Y4S 0pls 0pls refrigerant regulator)
  • Page 220: Pump-down Residual Operation

    SiUS34-801A_b Special Control Elect. symbol Evaporating outdoor unit actuator Defrost operation Operation after defrost Symbol REYQ REMQ REYQ72·96·120·144P: Upper limit Compressor 1 M1C REYQ72·96·120·144P: 232Hz+ON 124Hz (STD Holds) — REMQ72P: 210Hz REMQ72P: 210Hz REMQ96·120P: 210Hz+ON Compressor 2 REMQ96·120P: 210Hz+ON Outdoor unit fan 1 —...
  • Page 221 Special Control SiUS34-801A_b 7.5.1 Pump-down Residual Operation in Cooling Operation If the liquid refrigerant stays in the Evaporator at the startup of a compressor, this liquid refrigerant enters the compressor, thus resulting in diluted oil in the compressor and then degraded lubrication performance. Consequently, in order to recover the refrigerant in the Evaporator while the compressor stops, the pump-down residual operation is conducted.
  • Page 222: Standby

    SiUS34-801A_b Special Control 7.5.2 Pump-down Residual Operation in Heating Operation and Simultaneous Cooling / Heating Operation Elect. symbol Actuator Symbol Master unit operation Slave unit operation REYQ REMQ Compressor 1 M1C M1C — 124 Hz+OFF Compressor 2 M2C M2C Outdoor unit fan 1 —...
  • Page 223: Stopping Operation

    Special Control SiUS34-801A_b Electronic expansion valve 0 pls (Main) Electronic expansion valve 0 pls (Subcooling) Electronic expansion valve 80 pls (Refrigerant charge) Four-way valve (Heat 20SA Holds exchanger switch) Four-way valve (High/low 20SB Holds pressure gas pipe switch) Solenoid valve (Main bypass) SVE Y10S Y6S Solenoid valve (Hot gas) Solenoid valve (Refrigerant...
  • Page 224 SiUS34-801A_b Special Control Solenoid valve (Main bypass) Y10S Y6S Solenoid valve (Hot gas) Solenoid valve (Refrigerant regulator liquid pipe) Solenoid valve (Refrigerant regulator gas vent pipe) Solenoid valve (Refrigerant regulator exhaust pipe) Solenoid valve (Refrigerant regulator discharge pipe) Ending conditions —...
  • Page 225: Protection Control

    Protection Control SiUS34-801A_b 8. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure.
  • Page 226: Low Pressure Protection Control

    SiUS34-801A_b Protection Control [Heating Operation and Simultaneous Cooling / Heating Operation] The following control is performed in the entire system. Pc_max indicates the maximum value within the system. Normal Operation Pc_max>479.95psi Pc_max<426.3psi When high pressure is limited Compressor step: 7 STEP down Pc_max After 10 sec.
  • Page 227 Protection Control SiUS34-801A_b Pe_min indicates the minimum value within the system. Normal Operation Pe_min<49.3psi Pe_min>56.55psi During the control of low pressure protection Single type: Compressor step of the present situation × 0.5 Multi type: 210Hz+OFF (upper) Pe_min<36.25psi Single type: 8~12HP: 52Hz+OFF (upper limit) (6-10 Ton) Multi type: 52Hz+OFF (upper limit)
  • Page 228 SiUS34-801A_b Protection Control [In heating operation and Simultaneous Cooling / Heating Operation] The following control is performed in the system. Pe_min indicates the minimum value within the system. Normal Operation Pe_min Pe_min>33.35psi & <24.65psi Upper limit compressor step=max (Max. step) During the control of low pressure protection Compressor step: For single unit:...
  • Page 229 Protection Control SiUS34-801A_b [INV compressor] Normal operation HTdi<212˚F HTdi>239˚F & Tp<230˚F Tp>275˚F INV upper limit step=max (Max. step) INV Comp. upper INV Comp. upper limit step: limit step: 1-step down 1-step up After 20 sec. HTdi<230˚F After 30 sec. HTdi>239˚F &...
  • Page 230 SiUS34-801A_b Protection Control [Inverter overcurrent protection control] Perform the following control of integrated as well as multi units for each INV compressor. Normal operation Inverter current value<14.7A (460V) Inverter current value 26.5A (230V) >14.7A (460V) & INV upper limit frequency=max (210Hz) 26.5A (230A) During the control of inverter protection...
  • Page 231: Std Compressor Overload Protection

    Protection Control SiUS34-801A_b [Inverter fin temperature control] Perform the following control of integrated as well as multi units for each INV compressor. Normal operation Tfin>183.2˚F Tfin<177.8˚F & INV upper limit frequency=max (210Hz) During the control of fin temperature protection INV Comp. upper limit step: 1-step down Tfin>183.2˚F 10 seconds...
  • Page 232 SiUS34-801A_b Protection Control STD compressor ON *If the power supply is reset while in operation prohibition mode, the prohibition Demand to operate. CT detection current value>15.0A timer will continue counting when the (460) power supply is turned ON. 34 (230V) STD compressor OFF for 30 min.* When occurring 3 times within 90 min., the malfunction code “...
  • Page 233: Other Control

    Other Control SiUS34-801A_b 9. Other Control Backup Operation If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit from operating, and then conduct emergency operation only with operational compressors or outdoor units. Emergency operation with remote controller reset and Emergency operation with outdoor unit PC board settings are available.
  • Page 234: Test Operation

    SiUS34-801A_b Test Operation 10.Test Operation 10.1 Installation Process Below Figure shows the installation process. Install in the order of the steps shown. 3. Selection of Location 4. Inspecting and Handling the Unit 5. Placing the Unit 7. Field Wiring 6. Refrigerant Piping 8.
  • Page 235 Test Operation SiUS34-801A_b 10.2.1 Check Work Prior to Turn Power Supply On Is the wiring performed as specified? Check the below items. Is the designated wire used? 2Power wiring Is the wiring screw of wiring not loose? 2Control transmission wiring Is the grounding work completed? between units Is the insulation of the main power supply circuit deteriorated?
  • Page 236 SiUS34-801A_b Test Operation Is the correct quantity of refrigerant charged? Check on amount of refrigerant The following method is available for additional charging of charge refrigerant. (1) Calculate additional refrigerant quantity. • Calculate a necessary additional refrigerant charging amount according to the procedure for calculation shown below.
  • Page 237 Test Operation SiUS34-801A_b 10.2.2 Turn Power On Be sure to turn the power on 6 hours before starting operation to protect Turn outdoor unit and indoor compressors. (to power on crankcase heater) unit power on. Check to be sure the transmission is normal. Check the LED display of the The transmission is normal if the LEDs display conditions as shown in outdoor unit PC board.
  • Page 238 SiUS34-801A_b Test Operation 10.2.3 Air Tight Test and Vacuum Drying After finishing piping work, carry out air tight test and vacuum drying. Note: Always use nitrogen gas for the air-tightness test. Absolutely do not open the shutoff valve until the main power circuit insulation measurement has been completed.
  • Page 239 Test Operation SiUS34-801A_b <Air tight test> Pressurize the liquid pipe, suction gas pipe, HP/LP gas pipe and equalizer pipe from the service ports of each shutoff valve to 478 psi (do not pressurize more than 478 psi). If the pressure does not drop within 24 hours, the system passes the test.
  • Page 240 SiUS34-801A_b Test Operation REYQ72~120PYDN REMQ72~120PYDN REYQ72~144PTJU REMQ72~120PTJU Caulking, etc Caulking, etc. Insulation material figure 26 Insulation material Piping lead-out hole lid Block “ ” Open a knock hole at “ ” figure 27 NOTE: After knocking out the holes, we recommend you remove burrs in the knock holes (See figure 27) and paint the edges and areas around the edges using the repair paint.
  • Page 241 Test Operation SiUS34-801A_b 10.2.5 Checking of Device and Installation Conditions Be sure to check the following: For those doing electrical work 1. Make sure there is no faulty transmission wiring or loosening of a nut. 2. Make sure there is no faulty power wiring or loosening of a nut. 3.
  • Page 242 SiUS34-801A_b Test Operation NOTE: Do not open the shutoff valve until the steps in Section 10.2.5 Checking of Device and Installation Conditions are completed. If the shutoff valve is left open without turning on the power, it may cause refrigerant to build up in the compressor, leading to insulation degradation. Be sure to use the correct tools.
  • Page 243 Test Operation SiUS34-801A_b [How to Check How Many Units are Connected] It is possible to find out how many indoor or outside units in the system are turned on by operating the push button on the PC-board (A1P) of outside unit (In case of multi system master unit). Follow the procedure below to check how many indoor or outside units are turned on.
  • Page 244 SiUS34-801A_b Test Operation There is a risk of electric shock if you touch any live parts, since this operation must be performed with the power on. Caution Make sure to use the protect tool (protective gloves and goggles) when charging the refrigerant.
  • Page 245 Test Operation SiUS34-801A_b 3. Open the valve B (See the figure 30. The valve A,C and the liquid pipe, suction gas pipe, HP/ LP gas pipe, equalizer pipe shutoff valves must be left closed), and charge the refrigerant of the additional charging amount from the liquid side shutout valve service port.
  • Page 246 SiUS34-801A_b Test Operation MODE button (BS1). REYQ72~120PYDN Charge hose REYQ72~144PTJU Refrigerant charge port Outside unit HP/LP gas pipe shutoff valve Suction pipe shutoff valve Liquid pipe shutoff valve Valve B Measuring device Valve C R-410A tank (with siphon) Valve A : Field pipings To BS, : Refrigerant flow when charging...
  • Page 247 Test Operation SiUS34-801A_b (4) Push the TEST button (BS4) once. (The LED displays will change as below.) H1P H2P H3P H4P H5P H6P H7P (5) Hold the TEST button (BS4) down for 5 seconds or more. (The LED displays will change as below and fan of outside unit will start rotation.) H1P H2P H3P H4P H5P H6P H7P ∗...
  • Page 248 SiUS34-801A_b Test Operation units powered.For checking, see [How to check how many units are connected] in chapter 10.2.6.1. • To energize the crankcase heater, make sure to turn on the power for 6 hours before starting operation. (*3) It takes about 2~10 minutes to achieve refrigerant stability. If too little refrigerant is added and operation is started before stability is achieved, the system cannot precisely judge the amount charged and overcharging will result.
  • Page 249 Test Operation SiUS34-801A_b 10.2.6.2.2 Procedure of check operation Conduct the following check operations or malfunction code [U3] will be displayed in the remote controller and normal operation cannot be carried out: Check shutoff valve opening Check for miswiring Judgment of piping length Check refrigerant overcharge Note: Check operation can not be carried out at an outdoor temperature less than 23°F.
  • Page 250 SiUS34-801A_b Test Operation [Remote controller displays malfunction code] Malfunction Installation error Remedial action code E3, E4 The shutoff valve of the outside unit is left F3, F6 Open the shutoff valve. closed. The phases of the power to the outside Exchange two of the three phases (L1, L2, L3) to make a unit is reversed.
  • Page 251 Test Operation SiUS34-801A_b 10.2.8.2 Test Run After all works are completed, operate the unit normally and check the following: (1) Make sure the indoor and outside units are operating normally. (2) Operate each indoor unit one by one and make sure the corresponding outside unit is also operating.
  • Page 252 SiUS34-801A_b Test Operation Maximum concentration level The maximum charge of refrigerant and the calculation of the maximum concentration of refrigerant is directly related to the human-occupied space into which it could leak. The unit of measurement of the concentration is lb/ft (the weight in lb of the refrigerant gas in 1 ft volume of the occupied space).
  • Page 253: Operation When Power Is Turned On

    Test Operation SiUS34-801A_b NOTE: 3. Where a single refrigerant facility is divided into 2 entirely independent refrigerant systems, then use the amount of refrigerant with which each separate system is charged. 4. Follow local code requirements (ASHRAI-15 2007 & ASHRAI-34 2007). 10.3 Operation when Power is Turned On 10.3.1 When Turning On Power for the First Time The unit cannot be run for up to 12 minutes to allow for automatic setting of the master power and...
  • Page 254 SiUS34-801A_b Test Operation [R-410A] Label [R-410A] Label VRVIII R-410A Heat Recovery 60Hz...
  • Page 255: Outdoor Unit Pc Board Layout

    Outdoor Unit PC Board Layout SiUS34-801A_b 11.Outdoor Unit PC Board Layout Outdoor unit PC board (2) Set mode display (LED) (3) Mode setting switch H1P H2P H3P H4P H5P H6P H7P H8P 1 2 3 4 1 2 3 4 MODE RETURN TEST...
  • Page 256 SiUS34-801A_b Field Setting 12.Field Setting 12.1 Field Setting from Outdoor Unit 12.1.1 Field Setting from Outdoor Unit List of Field Setting Items This following section indicates the list of field setting items. For the lists of dip switch contents, Setting mode 1, and Setting mode 2, refer to information in tables shown on the following page onward.
  • Page 257 Field Setting SiUS34-801A_b Reference Setting item Content and objective of setting Overview of setting procedure page Indoor unit 249~252 fan forced H Used to operate the indoor unit in the Set No. 5 of Setting mode 2 to indoor operation stopped state in forced H operation mode.
  • Page 258: Field Setting

    SiUS34-801A_b Field Setting 12.1.2 Setting by Dip Switches (1) Factory setting of initial PC board. Do not make any changes to the factory settings of the DIP switches on the control PC board. Status of DIP switches : Represents the factory setting positions of the switches.
  • Page 259 Field Setting SiUS34-801A_b “Detail of DS1-1~4, DS2-1~4 setting” Single Unit A1P (Main) Factory Setting ( represents the position of switches) DS1 DS2 EB**** 460V Application model Setting method ( represents the position of switches) HEAT RECOVERY(6ton) REYQ72PYDN Set DS1-4, DS2-1 and DS2-3 to ON. 1 2 3 4 1 2 3 4 HEAT RECOVERY(8ton)
  • Page 260 SiUS34-801A_b Field Setting Single Unit A3P (Sub) Factory Setting ( represents the position of switches) DS1 DS2 EB**** 460V Application model Setting method ( represents the position of switches) HEAT RECOVERY(6ton) REYQ72PYDN Set DS1-3, DS1-4 and DS2-2 to ON. 1 2 3 4 1 2 3 4 HEAT RECOVERY(8ton) REYQ96PYDN...
  • Page 261 Field Setting SiUS34-801A_b Detail of DS1-1~4, DS2-1~4 settingMulti-unit Factory Setting ( represents the positions of switches) DS1DS2 EB**** 460V Application model Setting method ( represents the positions of switches) HEAT RECOVERY Set DS1-4, DS2-1, DS2-2 and DS2-3 to ON. REMQ72PYDN 1 2 3 4 1 2 3 4 HEAT RECOVERY...
  • Page 262 SiUS34-801A_b Field Setting 12.1.3 Setting by Push Button Switches The following settings are made by push button switches on PC board. In case of multi-outdoor unit system, various items should be set with the master unit. (Setting with the slave unit is disabled.) The master unit and slave unit are indicated with the LED display as displayed below: LED display COOL/HEAT select...
  • Page 263 Field Setting SiUS34-801A_b a. Setting mode 1 This mode is used to set and check the following items: (1) Current operating conditions (Normal / Abnormal / In check operation) (2) Low noise operating conditions (In normal operation / In low noise operation) (3) Demand operating conditions (In normal operation / In demand operation) Procedure for checking check items The system is normally set to "Setting...
  • Page 264 SiUS34-801A_b Field Setting b. Setting mode 2 Setting item Description Used to make setting of contents to display on the digital Digital pressure pressure gauges (e.g. pressure sensors and temperature gauge kit display Push and hold the MODE (BS1) sensors) button for 5 seconds and set to Cool/heat unified Setting mode 2.
  • Page 265 Field Setting SiUS34-801A_b Setting item Description Emergency operation (Setting for the unit 1 operation prohibition in multi- outdoor-unit system) Emergency operation Used to temporarily prohibit the applicable outdoor unit from (Setting for the unit operating should there be any faulty part in the multi-outdoor- 2 operation unit system.
  • Page 266 SiUS34-801A_b Field Setting Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory set 8777777 Address 8777778 Binary number Digital pressure gauge kit display (4 digits) 8778888 Address 8777777 Binary number 8777778 Cool / Heat Unified address (6 digits)
  • Page 267 Field Setting SiUS34-801A_b Setting item display C/H selection Setting condition display Deman MODE TEST Setting item noise Master Slave ∗ Factory set 8777777 Level 1 (outdoor fan with 6 step or 8777778 Night-time low noise setting Level 2 (outdoor fan with 5 step or 8777787 Level 3 (outdoor fan with 4 step or 8777788...
  • Page 268 SiUS34-801A_b Field Setting c. Monitor mode LED display Setting item Data display To enter the monitor mode, push the 9 7 7 7 7 7 7 Various settings Lower 4 digits MODE (BS1) button when in Setting mode 1. 9 7 7 7 7 7 8 C/H unified address 9 7 7 7 7 8 7 Low noise/demand address...
  • Page 269 Field Setting SiUS34-801A_b Setting item 0 displays the contents of various settings EMG operation / 9 7 7 8 7 7 7 backup operation 9 7 7 7 7 7 7 setting Defrost select setting Short 9 7 7 7 8 7 7 Medium 9 7 7 7 9 7 7 Long...
  • Page 270 SiUS34-801A_b Field Setting 12.1.4 Cool / Heat Mode Switching Set Cool/Heat Separately for Each BS Unit by Cool/Heat Selector. Set remote controller change over switch (SS1, SS2) as following: • When using COOL/HEAT selector, turn this switch to the BS side. NOTE: This setting must be completed before turning power supply ON.
  • Page 271 Field Setting SiUS34-801A_b 12.1.5 Setting of Low Noise Operation and Demand Operation Setting of Low Noise Operation By connecting the external contact input to the low noise input of the outdoor unit external control adaptor (optional), you can lower operating noise. Setting Content Level 1...
  • Page 272 SiUS34-801A_b Field Setting Image of operation in the case of A Operation sound If capacity precedence is set with the Capacity Precedence setting, the fan speed increases according to a heavier load of air conditioning. Rated operation sound Operation noise can be Operation sound of lowered by using the setting Approx.
  • Page 273 Field Setting SiUS34-801A_b Setting of Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor (optional), the power consumption of unit operation can be saved by suppressing the compressor operating condition. Description of setting Setting procedure Setting...
  • Page 274 SiUS34-801A_b Field Setting Image of operation in the case of A Power consumption The power Rated power consumption consumption during 80 % of rated power consumption the demand level 1 Demand level 1 instructing Demand level 2 instructing Demand level 3 instructing 70 % of rated power consumption instructing can be 60 % of rated power consumption...
  • Page 275 Field Setting SiUS34-801A_b Detailed Setting Procedure of Low Noise Operation and Demand Control 1. Setting mode 1 (H1P off) In setting mode 2, push the BS1 (MODE button) one time. → Setting mode 2 is entered and H1P lights. During the time that setting mode 1 is displayed, In low noise operation and In demand control are displayed.
  • Page 276 SiUS34-801A_b Field Setting : ON : OFF : Blink Setting Setting Setting No. indication Setting No. indication Setting Setting contents indication (Initial contents contents setting) External low NO (Factory noise / setting) Demand setting Night-time low noise (Factory setting setting) Mode 1 Mode 2 Mode 3...
  • Page 277 Field Setting SiUS34-801A_b 12.1.6 Setting of Refrigerant Recovery Mode When carrying out the refrigerant collection on site, fully open the respective expansion valve of indoor and outdoor units. All indoor and outdoor unit operations are prohibited. [Operation procedure] In Setting Mode 2 with units in stop mode, set Refrigerant Recovery / Vacuuming mode to ON.
  • Page 278 SiUS34-801A_b Field Setting 12.1.8 Check Operation Detail CHECK OPERATION FUNCTION (Press the MODE button BS1 once and set to SETTING MODE 1 (H1P: OFF)) LED display (H1P~H7P) ( BLINK) Unit stopping 3383333 Press the TEST button for 5 seconds. Step 1 Pressure equalizing 3933338 10 sec to 10 minutes...
  • Page 279 Field Setting SiUS34-801A_b 12.1.9 Emergency Operation If any of the compressors goes wrong, disable the relevant compressor or the relevant outdoor unit from operating, and then conduct emergency operation only with operational compressors or outdoor units. There are two ways of conducting the Emergency operation : N with remote controller reset and O by setting outdoor unit PC board.
  • Page 280 SiUS34-801A_b Field Setting <REYQ72 to 120PYDN, REYQ72 to 144PTJU> Disabling the compressor 1 (on the right side) from operating: Set No. 38 of setting mode 2 to Disable-compressor-1 operation LED display ( : ON, : OFF, : Blink) (Step) H1P-----------H7P (1) Press and hold the MODE button (BS1) 8111111 for 5 sec.
  • Page 281 Field Setting SiUS34-801A_b (6) Press the MODE button (BS1) once. 1181111 [Cancel of Emergency Operation] To cancel the emergency operation, conduct the following setting. (Return to Factory setting.) <REYQ72 to 120PYDN, REYQ72 to144PTJU> Cancel disabling the compressor 1 (on the right side) from operating: Set No.
  • Page 282 SiUS34-801A_b Field Setting <REYQ144 to 240PYDN, REYQ168 to 240PTJU> Cancel the disable-operation setting by each outdoor unit. Make the following setting on the outdoor unit 1. (If this setting is made on an outdoor unit other than the outdoor unit 2, the setting will become invalid.) * You can determine the outdoor units 1 and 2 according to the LED displays shown in the following diagram:...
  • Page 283 Field Setting SiUS34-801A_b 12.1.10Prevention of Small Heating in Non-operating Unit In heating operation, this setting is made to prevent room temperature from rising due to bleed heating capacity generated in the unit with its heating thermostat OFF or in the unit with its heating operation stopped.
  • Page 284 SiUS34-801A_b Part 4 Indoor Unit 1. Specifications ..................270 2. Refrigerant Circuit ...................284 3. Operation Flow Chart ................285 4. Thermostat Sensor in Remote Controller..........287 4.1 Thermostat Control While in Normal Operation ........289 4.2 Thermostat Control in Dry Operation ............289 4.3 Thermostat Control with Operation Mode Set to AUTO ......
  • Page 285: Specifications

    Specifications SiUS34-801A_b 1. Specifications Ceiling Mounted Cassette Type (Multi-flow) Model FXFQ12MVJU FXFQ18MVJU FXFQ24MVJU 1 Cooling Capacity Btu/h 12,000 18,000 24,000 2 Heating Capacity Btu/h 13,500 20,000 27,000 Casing / Color Galvanized Steel Plate Galvanized Steel Plate Galvanized Steel Plate inch 9-1/8 ×...
  • Page 286 SiUS34-801A_b Specifications Ceiling Mounted Cassette Type (Multi-flow) Model FXFQ30MVJU FXFQ36MVJU 1 Cooling Capacity Btu/h 30,000 36,000 2 Heating Capacity Btu/h 34,000 40,000 Casing / Color Galvanized Steel Plate Galvanized Steel Plate inch 11-3/8 × 33-1/8 × 33-1/8” 11-3/8 × 33-1/8 × 33-1/8” Dimensions: (H×W×D) (mm) (288.9 x 841.4 x 841.4 mm...
  • Page 287 Specifications SiUS34-801A_b Available in April 2008 4 Way Ceiling Mounted Cassette Unit (2’×2’) Model FXZQ07M7VJU FXZQ09M7VJU FXZQ12M7VJU 1 Cooling Capacity Btu/h 7,500 9,500 12,000 2 Heating Capacity Btu/h 8,700 11,100 14,000 Casing / Color Galvanized Steel / Non Painted Galvanized Steel / Non Painted Galvanized Steel / Non Painted 10-14 (11-1/4) x 22-5/8 x 22-5/8”...
  • Page 288 SiUS34-801A_b Specifications 4 Way Ceiling Mounted Cassette Unit (2’ × 2’) Model FXZQ18M7VJU 1 Cooling Capacity Btu/h 18,000 2 Heating Capacity Btu/h 21,000 Casing / Color Galvanized Steel / Non Painted 10-1/4 (11-1/4) x 22-5/8 x 22- 5/8” Dimensions: (H×W×D) (260 (286) x 575 x 575 mm) Rows×Stages×FPI 2 ×...
  • Page 289 Specifications SiUS34-801A_b Slim Ceiling Mounted Duct Type Model FXDQ07MVJU FXDQ09MVJU FXDQ12MVJU 1 Cooling Capacity Btu/h 7,500 9,500 12,000 2 Heating Capacity Btu/h 8,500 10,500 13,500 Casing / Color Galvanized Steel Plate Galvanized Steel Plate Galvanized Steel Plate 7-7/8 × 27-9/16 × 24-7/16” 7-7/8 ×...
  • Page 290 SiUS34-801A_b Specifications Slim Ceiling Mounted Duct Type Model FXDQ18MVJU FXDQ24MVJU 1 Cooling Capacity Btu/h 18,000 24,000 2 Heating Capacity Btu/h 20,000 27,000 Casing / Color Galvanized Steel Plate Galvanized Steel Plate 7-7/8 × 35-7/16 × 24-7/16” 7-7/8 × 43-5/16 × 24-7/16” Dimensions: (H×W×D) in (mm) (200 x 900 x 620.7 mm)
  • Page 291 Specifications SiUS34-801A_b Ceiling Mounted Built-in Type Model FXSQ12MVJU FXSQ18MVJU FXSQ24MVJU 1 Cooling Capacity Btu/h 12,000 18,000 24,000 2 Heating Capacity Btu/h 13,500 20,000 27,000 Casing / Color Galvanized Steel Plate Galvanized Steel Plate Galvanized Steel Plate 11-7/8 × 21-5/8 × 31-1/2” 11-7/8 ×...
  • Page 292 SiUS34-801A_b Specifications Ceiling Mounted Built-in Type Model FXSQ30MVJU FXSQ36MVJU FXSQ48MVJU 1 Cooling Capacity Btu/h 30,000 36,000 48,000 2 Heating Capacity Btu/h 34,000 40,000 54,000 Casing / Color Galvanized Steel Plate Galvanized Steel Plate Galvanized Steel Plate 11-7/8 × 55-1/8 × 31-1/2” 11-7/8 ×...
  • Page 293 Specifications SiUS34-801A_b Ceiling Mounted Duct Type Model FXMQ30MVJU FXMQ36MVJU FXMQ48MVJU 1 Cooling Capacity Btu/h 30,000 36,000 48,000 2 Heating Capacity Btu/h 34,000 40,000 54,000 Casing / Color Galvanized Steel Plate Galvanized Steel Plate Galvanized Steel Plate 15-3/8 × 28-3/8 × 27-1/8” 15-3/8 ×...
  • Page 294 SiUS34-801A_b Specifications Ceiling Suspended Type Model FXHQ12MVJU FXHQ24MVJU FXHQ36MVJU 1 Cooling Capacity Btu/h 12,000 24,000 36,000 2 Heating Capacity Btu/h 13,500 27,000 40,000 Casing / Color White(10Y9/0.5) White(10Y9/0.5) White(10Y9/0.5) 7-11/16 × 37-13/16 × 26-3/4” 7-11/16 × 55-1/8 × 26-3/4” 7-11/16 × 62-5/8× 26-3/4” Dimensions: (H×W×D) in (mm) (195.3 x 960.4 x 679.4 mm)
  • Page 295 Specifications SiUS34-801A_b Wall Mounted Type Model FXAQ07MVJU FXAQ09MVJU FXAQ12MVJU Btu/h 7,500 9,500 12,000 1 Cooling Capacity 2 Heating Capacity Btu/h 8,500 10,500 13,500 Casing Color White (3.0Y8.5/0.5) White (3.0Y8.5/0.5) White (3.0Y8.5/0.5) 11–3/8 × 31–1/4 ×9” 11–3/8 × 31–1/4 ×9” 11–3/8 × 31–1/4 ×9” Dimensions: (H×W×D) in (mm) (289 x 794 x 229 mm)
  • Page 296 SiUS34-801A_b Specifications Wall Mounted Type Model FXAQ18MVJU FXAQ24MVJU Btu/h 18,000 24,000 1 Cooling Capacity 2 Heating Capacity Btu/h 20,000 27,000 Casing Color White (3.0Y8.5/0.5) White (3.0Y8.5/0.5) 11–3/8 × 41-3/8 ×9” 11–3/8 × 41-3/8 ×9” Dimensions: (H×W×D) in (mm) (289 x1051 x 229 mm) (289 x1051 x 229 mm) Rows ×...
  • Page 297 Specifications SiUS34-801A_b Floor Standing Type Model FXLQ12MVJU FXLQ18MVJU FXLQ24MVJU 1 Cooling Capacity Btu/h 12,000 18,000 24,000 2 Heating Capacity Btu/h 13,500 20,000 27,000 Casing Color Ivory White (5Y7.5/1) Ivory White (5Y7.5/1) Ivory White (5Y7.5/1) 23–5/8 ×44–7/8 ×8–3/4” 23–5/8 ×55–7/8 ×8–3/4” 23–5/8 ×55–7/8 ×8–3/4”...
  • Page 298 SiUS34-801A_b Specifications Concealed Floor Standing Type Model FXNQ12MVJU FXNQ18MVJU FXNQ24MVJU 1 Cooling Capacity Btu/h 12,000 18,000 24,000 2 Heating Capacity Btu/h 13,500 20,000 27,000 Casing Color Galvanized Steel Plate Galvanized Steel Plate Galvanized Steel Plate 24 × 42–1/8 ×8–5/8” 24 × 53-1/8 ×8–5/8” 24 ×...
  • Page 299: Refrigerant Circuit

    Refrigerant Circuit SiUS34-801A_b 2. Refrigerant Circuit FXFQ, FXZQ, FXDQ, FXSQ, FXMQ, FXHQ, FXAQ, FXLQ, FXNQ Gas-side Piping Liquid-side Piping Electronic Filter Filter Expansion Valve Name Symbol Function Used to control superheated degree of gas when Electronic cooling and subcooled degree when heating. (Max. expansion valve 2000 pls) Suction air...
  • Page 300: Operation Flow Chart

    SiUS34-801A_b Operation Flow Chart 3. Operation Flow Chart Cooling Operation Start (Option) Turn ON Aux. electric : OFF power supply heater Humidifier : OFF Initialize electronic expansion valve Detect louver lock The previous settings of air LED in remote flow rate, wind direction, and controller turns ON temperature are displayed.
  • Page 301 Operation Flow Chart SiUS34-801A_b Microcomputer dry operation Heating Operation (option) Microcomputer dry display Drain : OFF pump kit Thermostat status : Operating in L mode after it stops for 6 min. Operating in L mode Swing flap? Electronic 20E : expansion valve Electronic Closed...
  • Page 302: Thermostat Sensor In Remote Controller

    SiUS34-801A_b Thermostat Sensor in Remote Controller 4. Thermostat Sensor in Remote Controller Temperature is controlled by both the the thermostat sensor in remote controller and the air suction thermostat in the indoor unit. This is limited to when the field setting for the thermostat sensor in remote controller is set to “Use.”...
  • Page 303 Thermostat Sensor in Remote Controller SiUS34-801A_b Heating When heating, the hot air rises to the top of the room, resulting in a lower temperature near the floor where the occupants are. When controlling by return air sensor only, the unit may cycle off before the lower part of the room reaches the preset temperature.
  • Page 304: Thermostat Control While In Normal Operation

    SiUS34-801A_b Thermostat Sensor in Remote Controller Thermostat Control While in Normal Operation VRV multi systems are set at factory to thermostat control mode using the remote controller. While in normal thermostat differential control mode (i.e., factory set mode), the thermostat turns OFF when the system reaches a temperature of -1.8°F from the set temperature while in cooling operation or of +1.8°F from that while in heating operation.
  • Page 305: Thermostat Control With Operation Mode Set To Auto

    Thermostat Sensor in Remote Controller SiUS34-801A_b Thermostat Control with Operation Mode Set to AUTO When the operation mode is set to AUTO on the remote controller, the system will conduct the temperature control shown below. Furthermore, setting changes of the differential value (D°F) can be made according to information in the Field settings with remote controller (beginning page302 ) section.
  • Page 306: Drain Pump Control

    SiUS34-801A_b Drain Pump Control Drain Pump Control 1. The drain pump is controlled by the ON/OFF buttons as shown in the following 4 figures: When the Float Switch is Tripped while the Cooling Thermostat is ON: ∗ 1. The objective of residual operation is to completely drain any moisture adhering to the fin of the indoor unit heat exchanger when the thermostat goes off during cooling operation.
  • Page 307: When The Float Switch Is Tripped During Heating Operation

    Drain Pump Control SiUS34-801A_b When the Float Switch is Tripped During Heating Operation: During heating operation, if the float switch is not reset after 5 minutes of operation, it stops for 5 seconds, then for 5 minutes the operation cycle ends, then operation resumes until the switch is reset.
  • Page 308: Control Of Electronic Expansion Valve

    SiUS34-801A_b Control of Electronic Expansion Valve 6. Control of Electronic Expansion Valve Electronic expansion valves in indoor units conduct superheated degree control in cooling operation and subcooled degree control in heating operation. If the indoor units receive any control command such as a protection control command or a special control command from the outdoor unit, the units will give priority to the control command.
  • Page 309: Freeze Prevention

    Freeze Prevention SiUS34-801A_b 7. Freeze Prevention Freeze When the temperature detected by liquid pipe temperature thermistor (R2T) of the indoor unit heat exchanger drops too low, the unit enters freeze prevention operation in accordance with the Prevention by Off following conditions, and is also set in accordance with the conditions given below. Cycle (Indoor When freeze prevention is activated, the electronic expansion valve is closed, the drain pump turns Unit)
  • Page 310: Heater Control (optional Pc Board Krp1b

    SiUS34-801A_b Heater Control (Optional PC Board KRP1B ... is required.) 8. Heater Control (Optional PC Board KRP1B ... is required.) The heater control is conducted in the following manner. [Normal control] While in heating operation, the heater Set temperature control (ON/OFF) is conducted as shown on the right.
  • Page 311: List Of Louver Operations

    List of Louver Operations SiUS34-801A_b 9. List of Louver Operations Louvers operate as shown in table below. Louver FXHQ FXFQ FXAQ FXKQ Swing Horizontal Horizontal Horizontal Hot start from defrosting operation Wind direction set OFF Horizontal Horizontal Horizontal Swing Horizontal Horizontal Horizontal Defrosting operation...
  • Page 312: Hot Start Control (in Heating Operation Only)

    SiUS34-801A_b Hot Start Control (In Heating Operation Only) 10.Hot Start Control (In Heating Operation Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor unit fan is controlled to prevent cold air from blasting out and ensure startup capacity. [Detail of operation] When either the start condition 1 or the start condition 2 is established, the operations shown below will be conducted.
  • Page 313: Louver Control For Preventing Ceiling Dirt

    Louver Control for Preventing Ceiling Dirt SiUS34-801A_b 11.Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of adjustable airflow direction in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.
  • Page 314: Field Setting

    SiUS34-801A_b Field Setting 12.Field Setting 12.1 Field Setting from Remote Controller Individual function of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the local setting in accordance with the following description.
  • Page 315 Field Setting SiUS34-801A_b 12.1.2 Wireless Remote Controller - Indoor Unit BRC7C812 BRC4C82 BRC7E818 BRC7E83 1. When in the normal mode, push the button for 4 seconds or more, and operation then enters the “field set mode.” 2. Select the desired “mode No.” with the button.
  • Page 316 SiUS34-801A_b Field Setting 12.1.3 Simplified Remote Controller BRC2A71 1. Remove the upper part of remote controller. 2. When in the normal mode, press the [BS6] BUTTON (O) (field set), and the FIELD SET MODE is entered. 3. Select the desired MODE No. with the [BS2] BUTTON (P) (temperature setting ) and the [BS3] BUTTON (P) (temperature setting 4.
  • Page 317 Field Setting SiUS34-801A_b 12.1.4 Setting Contents and Code No. – VRV Indoor unit Mode Second Code No.(Note 3) Setting Details Setting Contents Switch Note 2 Approx. Approx. Super long 10,000 5,000 life filter Filter contamination heavy/ hrs. hrs. light (Setting for display time to clean air filter) Approx.
  • Page 318 SiUS34-801A_b Field Setting 12.1.5 Applicable range of Field setting Ceiling mounted cassette Slim Ceiling Ceiling Ceiling Ceiling Wall Floor Concealed type mounted mounted mounted Suspended mounted standing Floor duct type built-in type duct type type type type standing Multi flow type FXFQ FXZQ...
  • Page 319 Field Setting SiUS34-801A_b 12.1.6 Detailed Explanation of Setting Modes (1) Filter Sign Setting If switching the filter sign ON time, set as given in the table below. Set Time Filter Specs. Standard Long Life Ultra Long Life Filter Setting Contamination Light 200 hrs.
  • Page 320 SiUS34-801A_b Field Setting (5) Optional Output Switching Using this setting, operation output signal and abnormal output signal can be provided. Output signal is output between terminals K1 and K2 of customized wiring adapter, an optional accessory. Mode No. First Code No. Second Code No.
  • Page 321 Field Setting SiUS34-801A_b (9) Setting of operation mode to [AUTO] This setting makes it possible to change differential values for mode selection while in automatic operation mode. Setting position No. Mode No. Setting switch No. 12 (22) 0°F 1.8°F 2.6°F 5.4°F 7.2°F 9.0°F 10.8°F 12.6°F...
  • Page 322 SiUS34-801A_b Field Setting In the Case of FXFQ12~30 First Second Ceiling height Mode code code Setting 4-way Outlets 3-way Outlets 2-way Outlets Standard (N) Lower than Lower than Lower than 9 ft 10 ft 12 ft High Ceiling (H) Lower than Lower than Lower than 13 (23)
  • Page 323 Field Setting SiUS34-801A_b (16) Humidification When Heating Thermostat is OFF Setting to Humidification Setting turns ON the humidifier if suction temperature is 20ºC or above and turns OFF the humidifier if suction temperature is 18ºC or below when the heating thermostat is OFF.
  • Page 324 SiUS34-801A_b Field Setting 12.1.7 Centralized Control Group No. Setting BRC1D Type If carrying out centralized control by central remote controller or unified ON/OFF controller, group No. must be set for each group individually by remote controller. Group No. setting by remote controller for centralized control 1.
  • Page 325 Field Setting SiUS34-801A_b BRC7C Type Group No. setting by wireless remote controller for centralized control BRC4C Type 1. When in the normal mode, push the button for 4 seconds or more, and operation then enters the field set mode. BRC7E Type 2.
  • Page 326 SiUS34-801A_b Field Setting Group No. Setting Example Centoral Remote Controller Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 Group Control by Remote Contoller Main 1-00...
  • Page 327 Field Setting SiUS34-801A_b 12.1.8 Setting of Operation Control Mode from Remote Controller (Local Setting) The operation control mode is compatible with a variety of controls and operations by limiting the functions of the operation remote controller. Furthermore, operations such as remote controller ON/ OFF can be limited in accordance with the combination conditions.
  • Page 328 SiUS34-801A_b Field Setting How to Select If operation by remote controller is available or not for turning on/off, controlling temperature, or Operation Mode setting operation, the mode is designated by the operation mode in the right hand column of the following table: Example ON by remote...
  • Page 329 Field Setting SiUS34-801A_b Indoor Unit...
  • Page 330 SiUS34-801A_b Part 5 Troubleshooting 1. Symptom-based Troubleshooting ............318 2. Troubleshooting by Remote Controller ...........321 2.1 The INSPECTION / TEST Button............. 321 2.2 Self-diagnosis by Wired Remote Controller ..........322 2.3 Self-diagnosis by Wireless Remote Controller ......... 323 2.4 Inspection Mode ..................326 2.5 Remote Controller Service Mode .............
  • Page 331 SiUS34-801A_b 3.28 J5 Outdoor Unit: Malfunction of Thermistor (R8T or R10T) Suction Pipe. 382 3.29 J6 Outdoor Unit: Malfunction of Thermistor (R4T or R12T) for Outdoor Unit Heat Exchanger..................383 3.30 J7 Outdoor Unit: Malfunction of Liquid Pipe Thermistor 1 (R6T), (R9T) or (R14T) ......................
  • Page 332 SiUS34-801A_b 5.1 Operation Lamp Blinks ................453 5.2 Display [Under Centralized Control] Blinks (Repeats Single Blink)..455 5.3 Display [Under Centralized Control] Blinks (Repeats Double Blink) ..458 Troubleshooting...
  • Page 333: Symptom-based Troubleshooting

    Symptom-based Troubleshooting SiUS34-801A_b 1. Symptom-based Troubleshooting Symptom Probable Cause Countermeasure System does not start operation at all. Blowout of fuse(s) Turn Off the power supply and then replace the fuse(s). Cutout of breaker(s) • If the knob of any breaker is in its OFF position, turn ON the power supply.
  • Page 334 SiUS34-801A_b Symptom-based Troubleshooting Symptom Probable Cause Countermeasure COOL-HEAT The remote controller displays This remote controller has no option Use a remote controller with option selection is UNDER CENTRALIZED to select cooling operation. to select cooling operation. disabled. CONTROL. The remote controller displays COOL-HEAT selection is made Use the COOL-HEAT selection UNDER CENTRALIZED...
  • Page 335 Symptom-based Troubleshooting SiUS34-801A_b Symptom Probable Cause Countermeasure <Indoor unit> These sounds are produced from Normal operation. Faint sounds are continuously the drain discharge device in produced while in cooling operation. operation or after stopping the operation. <Indoor unit> These sounds are produced from Normal operation.
  • Page 336: Troubleshooting By Remote Controller

    SiUS34-801A_b Troubleshooting by Remote Controller 2. Troubleshooting by Remote Controller The INSPECTION / TEST Button The following modes can be selected by using the [Inspection/Test Operation] button on the remote control. Depress Inspection/Test Operation button for more than 4 seconds. Indoor unit settings can be made Service data can be obtained.
  • Page 337: Self-diagnosis By Wired Remote Controller

    Troubleshooting by Remote Controller SiUS34-801A_b Self-diagnosis by Wired Remote Controller Explanation If operation stops due to malfunction, the remote controller’s operation LED blinks, and the malfunction code is displayed. Even if stop operation is carried out, malfunction contents are displayed when the inspection mode is entered. The malfunction code enables you to tell what kind of malfunction caused operation to stop.
  • Page 338: Self-diagnosis By Wireless Remote Controller

    SiUS34-801A_b Troubleshooting by Remote Controller Self-diagnosis by Wireless Remote Controller In the Case of If equipment stops due to a malfunction, the operation LED indicator flashes. BRC7C Type The malfunction code can be determined by following the procedure described below. The malfunction code is displayed when an operation error has occurred.
  • Page 339 Troubleshooting by Remote Controller SiUS34-801A_b The lower digit of the code changes as shown below when the UP and DOWN buttons are pressed. Troubleshooting...
  • Page 340 SiUS34-801A_b Troubleshooting by Remote Controller Troubleshooting...
  • Page 341: Inspection Mode

    Troubleshooting by Remote Controller SiUS34-801A_b Inspection Mode Operating the INSPECTION/TEST button on the remote controller allows you to check the malfunction codes, indoor unit model codes, and outdoor unit model codes while in inspection mode. Unit Malfunction code Inspection Normal display (No display) Malfunction code blinks when a malfunction occurs.
  • Page 342: Remote Controller Service Mode

    SiUS34-801A_b Troubleshooting by Remote Controller Remote Controller Service Mode Operating the CHECK/TEST button on the remote controller will make it possible to obtain service data and change service setting while in service mode. How to Enter the Service Mode Service Mode 1.
  • Page 343 Troubleshooting by Remote Controller SiUS34-801A_b Mode Function Contents and operation method Remote controller display example Malfunction Display malfunction hysteresis. hysteresis display Unit The history No. can be changed with the Malfunction code button. 2-U4 Malfunction code Hystory No: 1 - 9 1: Latest (VE007) Display of sensor...
  • Page 344: Test Run Mode

    SiUS34-801A_b Troubleshooting by Remote Controller Test Run Mode Selecting the INSPECTION/TEST button on the remote controller enables Test Run Mode. (1) Test run mode setting Use the following steps to initiate Test Run Mode: Normal Test run operation mode mode Press the CHECK/TEST button 4 times.
  • Page 345 Troubleshooting by Remote Controller SiUS34-801A_b 8: ON 7: OFF 9: Blink Malfunction Operation Inspection Unit No. Malfunction contents Page code lamp display Indoor Unit Error of external protection device PC board defect, E PROM defect Malfunction of drain level control system (S1L) Fan motor (M1F) lock, overload Malfunction of swing flap motor (M1S) Malfunction of moving part of electronic expansion...
  • Page 346 SiUS34-801A_b Troubleshooting by Remote Controller 8: ON 7: OFF 9: Blink Malfunction Operation Inspection Unit No. Malfunction contents Page code lamp display Outdoor Unit Malfunction of inverter PC board Malfunction of inverter radiating fin temperature rise DC output overcurrent of inverter compressor Inverter current abnormal Inverter start up error Malfunction of power unit...
  • Page 347 Troubleshooting by Remote Controller SiUS34-801A_b Malfunction code Malfunctions Malfunction code <Monitor mode> Description of malfunction Description of malfunction (PGF) Remote controller To enter the monitor mode, push the PC board malfunction PC board malfunction MODE (BS1) button when in Faulty PC board “Setting mode 1”.
  • Page 348 SiUS34-801A_b Troubleshooting by Remote Controller 8: ON 7: OFF 9:Blink Confirmation of malfunction 1 (Check 1) Confirmation of malfunction 2 (Check 2) Confirmation of malfunction 3 (Check 3) Confirmation of malfunction 4 (Check 4) Malfunction code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P ∗1 ∗1 ∗1...
  • Page 349 Troubleshooting by Remote Controller SiUS34-801A_b <Monitor mode> Malfunctions Malfunction To enter the monitor mode, push the code MODE (BS1) button when in Description of malfunction Description of malfunction (PGF) Remote “Setting mode 1”. controller INV PC board malfunction Faulty IPM Current sensor failure confirmation 1 IGBT malfunction * Refer to Page 106, 254 for Monitor...
  • Page 350 SiUS34-801A_b Troubleshooting by Remote Controller 8: ON 7: OFF 9: Blink Confirmation of malfunction 1 (Check 1) Confirmation of malfunction 2 (Check 2) Confirmation of malfunction 3 (Check 3) Confirmation of malfunction 4 (Check 4) Malfunction code H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P ∗1 ∗1 ∗1...
  • Page 351: Troubleshooting By Indication On The Remote Controller

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3. Troubleshooting by Indication on the Remote Controller Indoor Unit: Error of External Protection Device Remote Controller Display Applicable All indoor unit models Models Method of Detect open or short circuit between external input terminals in indoor unit. Malfunction Detection Malfunction...
  • Page 352: A1 Indoor Unit: Pc Board Defect

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Indoor Unit: PC Board Defect Remote Controller Display Applicable All indoor unit models Models Method of Check data from E²PROM. Malfunction Detection Malfunction When data could not be correctly received from the E²PROM Decision E²PROM : Type of nonvolatile memory.
  • Page 353 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Malfunction of Drain Level Control System (S1L) Remote Controller Display Applicable FXFQ, FXSQ, FXDQ, FXMQ, FXHQ (Option), FXAQ (Option) Models Method of By float switch OFF detection Malfunction Detection Malfunction When rise of water level is not a condition and the float switch goes OFF.
  • Page 354 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is power supply Provide 220~240V power 220~240V provided? supply. The float A short switch is connected to circuit connector is Connect either a short circuit...
  • Page 355: A6 Indoor Unit: Fan Motor (m1f) Lock, Overload

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Fan Motor (M1F) Lock, Overload Remote Controller Display Applicable FXAQ, FXFQ Models Method of Abnormal fan revolutions are detected by a signal output from the fan motor. Malfunction Detection Malfunction When the fan revolutions do not increase Decision Conditions...
  • Page 356 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn OFF the power supply, and then wait for a period of 10 minutes. Are there any foreign matters Remove the foreign matters.
  • Page 357 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Malfunction of Indoor Unit Fan Motor Remote Controller Display Applicable FXHQ, FXDQ Models Method of Malfunction Detected by no fan motor revolutions. Detection Malfunction Decision Conditions No fan revolutions Faulty indoor fan motor Broken wires detected even at Faulty contact...
  • Page 358 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Indoor Unit: Overload / Overcurrent / Lock of Indoor Unit Fan Motor Remote Controller Display Applicable FXMQ Models Method of Individual power supply for the fan turns OFF. Malfunction Detection Malfunction Individual power supply for the indoor unit fan does not turn ON while in operation. Decision Conditions Supposed...
  • Page 359: A7 Indoor Unit: Malfunction Of Louver Motor (m1s)

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Malfunction of Louver Motor (M1S) Remote Controller Display Applicable FXHQ Models Method of Utilizes ON/OFF of the limit switch when the motor turns. Malfunction Detection Malfunction When ON/OFF of the microswitch for positioning cannot be reversed even though the louver motor Decision is energized for a specified amount of time (about 30 seconds).
  • Page 360 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is power supply Provide 220~240V power 220~240V provided? supply. Indoor unit is a model equipped Replace indoor unit PC board.
  • Page 361: A9 Indoor Unit: Electronic Expansion Valve

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Electronic Expansion Valve Malfunction / Dust Clogging Remote Controller Display Applicable FXFQ Models Method of Check coil condition of electronic expansion valve by using microcomputer. Malfunction Check dust clogging condition of electronic expansion valve main body by using microcomputer. Detection Malfunction Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
  • Page 362 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. When power is supplied. Replace electronic expansion valve main body. Electronic expansion valve is Shut the power supply off after connected to X7A of connection and then restart.
  • Page 363 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Malfunction of Electronic Expansion Valve Coil Remote Controller Display Applicable Indoor units except FXFQ models Models Method of Check coil condition of electronic expansion valve by using microcomputer. Malfunction Detection Malfunction Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.
  • Page 364 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Electronic expansion valve Shut the power supply off after is connected to X7A of connection and then restart.
  • Page 365 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Drain Level above Limit Remote Controller Display Applicable FXFQ, FXSQ, FXMQ, FXDQ Models Method of Water leakage is detected based on float switch ON/OFF operation while the compressor is in non- Malfunction operation.
  • Page 366 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Indoor Unit: Malfunction of Capacity Determination Device Remote controller display Applicable All indoor unit models Models Method of Capacity is determined according to resistance of the capacity setting adaptor and the memory Malfunction inside the IC memory on the indoor unit PC board, and whether the value is normal or abnormal .
  • Page 367 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Indoor Unit: Malfunction of Thermistor (R2T) for Heat Exchanger Remote Controller Display Applicable All indoor unit models Models Method of Malfunction Temperature of the heat exchanger thermistor. Detection Malfunction When the heat exchanger thermistor becomes disconnected or shorted while the unit is running. Decision Conditions Supposed...
  • Page 368 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.10 Indoor Unit: Malfunction of Thermistor (R3T) for Gas Pipes Remote Controller Display Applicable All indoor unit models Models Method of Malfunction Temperature of the gas pipe thermistor. Detection Malfunction When the gas pipe thermistor becomes disconnected or shorted while the unit is running. Decision Conditions Supposed...
  • Page 369 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.11 Indoor Unit: Malfunction of Thermistor (R1T) for Suction Air Remote Controller Display Applicable AII indoor unit models Models Method of Malfunction detection is carried out by temperature detected by suction air temperature thermistor. Malfunction Temperature detected by the suction air temperature thermistor..
  • Page 370 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.12 Indoor Unit: Malfunction of Thermostat Sensor in Remote Controller Remote Controller Display Applicable AII indoor unit models Models Method of Malfunction Temperature detected by remote controller air temperature thermistor. Detection Malfunction When the remote controller air temperature thermistor becomes disconnected or shorted while the unit is running.
  • Page 371: E1 Outdoor Unit: Pc Board Defect

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.13 Outdoor Unit: PC Board Defect Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Abnormality is detected in the hardware section communication between the indoor unit and Malfunction outdoor unit. Detection Malfunction When the communication conditions in the hardware section between the indoor unit and the...
  • Page 372: E2 Outdoor Unit: Detection Of Ground Leakage By Leak Detection Pc Board

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.14 Outdoor Unit: Detection of ground leakage by leak detection PC board ass’y Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Failure is to be detected by using leak detection PC board assembly. . Malfunction Detection Malfunction...
  • Page 373 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn OFF the power supply, and then disconnect compressor lead wire. Check the Insulation fault compressor for insulation Replace the faulty...
  • Page 374: E3 Outdoor Unit: Actuation Of High Pressure Switch

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.15 Outdoor Unit: Actuation of High Pressure Switch Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Abnormality is detected when the contact of the high pressure protection switch opens. Malfunction Detection Malfunction...
  • Page 375 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check for the points shown below. Is the stop valve open? Is the HPS connector properly connected to the main PC board? Does the high pressure switch have continuity? Are the...
  • Page 376: E4 Outdoor Unit: Actuation Of Low Pressure Sensor

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.16 Outdoor Unit: Actuation of Low Pressure Sensor Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Abnormality is detected by the pressure value with the low pressure sensor. Malfunction Detection Malfunction Error is generated when the low pressure is dropped under compressor operation.
  • Page 377 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the stop Open the stop valve. valve open? Mount a pressure gauge on the low-pressure service port.
  • Page 378: E5 Outdoor Unit: Inverter Compressor Motor Lock

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.17 Outdoor Unit: Inverter Compressor Motor Lock Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Inverter PC board takes the position signal from UVW line connected between the inverter and Malfunction compressor, and the malfunction is detected when any abnormality is observed in the phase-current waveform.
  • Page 379 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check if Local factor the stop valve is open. Open the stop valve. Check if the relay wires to the Replace the connecting wires and...
  • Page 380 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.18 Outdoor Unit: STD Compressor Motor Overcurrent/ Lock Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Detects the overcurrent with current sensor (CT). Malfunction Detection Malfunction Malfunction is decided when the detected current value exceeds the following value for 2 seconds: 400 V unit : 15.0 A Decision Conditions...
  • Page 381 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the stop valve open? Open the stop valve. Obstacle exists around the air Remove the obstacle.
  • Page 382: E7 Outdoor Unit: Malfunction Of Outdoor Unit Fan Motor

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.19 Outdoor Unit: Malfunction of Outdoor Unit Fan Motor Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Detect a malfunction based on the current value in the INVERTER PC board (as for motor 2, Malfunction current value in the fan PC board).
  • Page 383 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check in the monitor mode REYQ72~120PYDN models have 2 fans. Check electric motor (electric motor 1 or 2) corresponding to malfunction code “E7”...
  • Page 384 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting No continuity of fuse (FIU) on the fan Replace fan inverter PC inverter PC board. board. Unable to rotate the fan manually Replace the corresponding with ease when removing the connector of the fan motor.
  • Page 385 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.20 Outdoor Unit: Malfunction of Moving Part of Electronic Expansion Valve (Y1E~Y5E) Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Check disconnection of connector Malfunction To be detected based on continuity of of electronic expansion valve coil Detection Malfunction No current is detected in the common (COM [+]) when power supply is ON.
  • Page 386 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn power supply off, and turn power supply on again. Return to normal? External factor other than malfunction (for example, noise etc.).
  • Page 387: F3 Outdoor Unit: Abnormal Discharge Pipe Temperature

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.21 Outdoor Unit: Abnormal Discharge Pipe Temperature Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Temperature detected by the discharge pipe temperature sensor. Malfunction Detection Malfunction When the discharge pipe temperature rises to an abnormally high level (275 °F and above) Decision When the discharge pipe temperature rises suddenly (248 °F and above for10 successive minutes) Conditions...
  • Page 388 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Connect the service checker. Press reset and start operation again. Check if discharge pipe Replace discharge pipe thermister.
  • Page 389: F6 Outdoor Unit: Refrigerant Overcharged

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.22 Outdoor Unit: Refrigerant Overcharged Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Excessive charging of refrigerant is detected by using the outside air temperature, heat exchanging Malfunction deicer temperature and liquid pipe temperature during a check run. Detection Malfunction When the amount of refrigerant, calculated by outside temperature, exceeds the standard heat-...
  • Page 390: H7 Outdoor Unit: Abnormal Outdoor Fan Motor Signal

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.23 Outdoor Unit: Abnormal Outdoor Fan Motor Signal Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Abnormal signal from fan motor. Malfunction Detection Malfunction In case of detection of abnormal signal at starting fan motor. Decision Conditions Supposed...
  • Page 391 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the fan motor corresponding to the malfunction code “ ” in the monitor mode. (Refer to P334~335 for how to check) When check 3 shows as follows: →...
  • Page 392 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.24 Outdoor Unit: Malfunction of Thermistor (R1T) for Outdoor Air Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Temperature detected by the outdoor air thermistor. Malfunction Detection Malfunction When the outside air temperature thermistor has short circuit or open circuit. Decision Conditions Supposed...
  • Page 393: J2 Outdoor Unit: Current Sensor Malfunction

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.25 Outdoor Unit: Current Sensor Malfunction Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Current value detected by current sensor. Malfunction Detection Malfunction When the current value detected by current sensor becomes 5A or lower, or 40A or more during Decision standard compressor operation.
  • Page 394 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the current sensor corresponding to the malfunction code “ ” in the monitor mode. (Refer to P334~335 for how to check) Check 4 shows as follows: →...
  • Page 395 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.26 Outdoor Unit: Malfunction of Discharge Pipe Thermistor (R31, 32T) Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Temperature detected by discharge pipe temperature thermistor. Malfunction Detection Malfunction When a short circuit or an open circuit in the discharge pipe temperature thermistor is detected. Decision Conditions Supposed...
  • Page 396: Heat Exchanger

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.27 Outdoor Unit: Malfunction of Temperature Sensor for Heat Exchanger Gas (R2T or R11T) Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Temperature detected by each thermistor. Malfunction Detection Malfunction In operation, when a thermistor is disconnected or short circuits.
  • Page 397 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.28 Outdoor Unit: Malfunction of Thermistor (R8T or R10T) for Suction Pipe Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Temperature detected by the suction pipe temperature thermistor. Malfunction Detection Malfunction When a short circuit or an open circuit in the suction pipe temperature thermistor is detected.
  • Page 398 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.29 Outdoor Unit: Malfunction of Thermistor (R4T or R12T) for Outdoor Unit Heat Exchanger Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Temperature detected by the heat exchanger thermistor. Malfunction Detection Malfunction...
  • Page 399: (r14t)

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.30 Outdoor Unit: Malfunction of Liquid Pipe Thermistor 1 (R6T), (R9T) or (R14T) Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected according to the temperature detected by liquid pipe thermistor. Malfunction Detection Malfunction...
  • Page 400 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.31 Outdoor Unit: Malfunction of Liquid Pipe Thermistor 2 (R7T or R15T) Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected according to the temperature detected by liquid pipe thermistor. Malfunction Detection Malfunction...
  • Page 401 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.32 Outdoor Unit: Malfunction of Subcooling Heat Exchanger Gas Pipe Thermistor (R5T or R13T) Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected according to the temperature detected by subcooling heat exchanger gas Malfunction pipe thermistor.
  • Page 402: Ja Outdoor Unit: Malfunction Of High Pressure Sensor

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.33 Outdoor Unit: Malfunction of High Pressure Sensor Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected from the pressure detected by the high pressure sensor. Malfunction Detection Malfunction When the high pressure sensor is short circuit or open circuit.
  • Page 403 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Confirm which high pressure sensor is abnormal using outdoor unit "monitor mode". (Refer to page 334~335) 1.Set the high pressure gauge upright.
  • Page 404: Jc Outdoor Unit: Malfunction Of Low Pressure Sensor

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.34 Outdoor Unit: Malfunction of Low Pressure Sensor Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected from pressure detected by low pressure sensor. Malfunction Detection Malfunction When the low pressure sensor is short circuit or open circuit.
  • Page 405 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Confirm which low pressure sensor is abnormal using outdoor unit "monitor mode". (Refer to Page 334~335) 1.Set the low pressure gauge upright.
  • Page 406: L1 Outdoor Unit: Defective Inverter Pc Board

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.35 Outdoor Unit: Defective Inverter PC Board Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected based on the current value during waveform output before starting Malfunction compressor.
  • Page 407 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Turn OFF the power supply once, and then check the compressor lead wires. Do the lead wires have any Replace the lead wires.
  • Page 408: L4 Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise393

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.36 Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature Rise Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Fin temperature is detected by the thermistor of the radiation fin. Malfunction Detection Malfunction...
  • Page 409 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the single system applied to the outdoor unit? Single system Multi system While in monitor mode, check While in monitor mode, whether the system is right-...
  • Page 410 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Inverter PC board for compressor ∗ Refer to “Thermistor Resistance / Temperature Characteristics” table on P523. Troubleshooting...
  • Page 411: L5 Outdoor Unit: Momentary Overcurrent Of Inverter Compressor

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.37 Outdoor Unit: Momentary Overcurrent of Inverter Compressor Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected from current flowing in the power transistor. Malfunction Detection Malfunction When an excessive current flows in the power transistor.
  • Page 412 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Compressor inspection Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check if the stop valve is Open the stop valve. open.
  • Page 413: L8 Outdoor Unit: Momentary Overcurrent Of Inverter Compressor

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.38 Outdoor Unit: Momentary Overcurrent of Inverter Compressor Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Malfunction is detected by current flowing in the power transistor. Malfunction Detection Malfunction When overload in the compressor is detected.
  • Page 414 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Output current check Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check if the Open the stop valve. stop valve is open. Check if the compressor lead wires are Replace compressor...
  • Page 415: L9 Outdoor Unit: Inverter Compressor Starting Failure

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.39 Outdoor Unit: Inverter Compressor Starting Failure Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Detect the failure based on the signal waveform of the compressor. Malfunction Detection Malfunction Starting the compressor does not complete.
  • Page 416 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the single system applied to the outdoor unit? Single system Multi system While in monitor mode, check While in monitor mode, whether the system is right-...
  • Page 417 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Continued from the previous page. (Start failure due to aged operation.) Refrigerant is sleeping. ( The unit is out Cancel the sleeping state of of power supply for more refrigerant. than 6 hours.) Check if the insulation resistance of the Replace the inverter compressor.
  • Page 418: Lc Outdoor Unit: Malfunction Of Transmission Between Inverter And Control Pc Board

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.40 Outdoor Unit: Malfunction of Transmission between Inverter and Control PC Board Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU REYQ72P~240PYDN, PTJU Models Method of Check the communication state between inverter PC board and control PC board by micro- Malfunction computer.
  • Page 419 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Does the Was the PC board model setting of the Make correct model setting. (A1P) replaced with a spare substitute PC board match the (For setting procedure, refer to...
  • Page 420 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting The fuse Replace the noise F400U of the A3P has been filter of the A3P. molten down. Disconnect the sensor connector (X2A or X4A) from the fan motor, and then turn ON the power supply. Is any malfunction code Take countermeasures...
  • Page 421: P1 Outdoor Unit: Inverter Over-ripple Protection

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.41 Outdoor Unit: Inverter Over-Ripple Protection Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Imbalance in supply voltage is detected in PC board. Malfunction Imbalance in the power supply voltage causes increased ripple of voltage of the main circuit capacitor in the inverter.
  • Page 422 Be sure to explain to the user that Give the user a copy of "notification of inspection results" and leave there is a "power supply imbalance" it up to him to improve the imbalance. for which DAIKIN is not responsible. (V2816) Troubleshooting...
  • Page 423: P4 Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise Sensor

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.42 Outdoor Unit: Malfunction of Inverter Radiating Fin Temperature Rise Sensor Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Resistance of radiation fin thermistor is detected when the compressor is not operating. Malfunction Detection Malfunction...
  • Page 424 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Inverter PC board for compressor ∗ Refer to “Thermistor Resistance / Temperature Characteristics” table on P523. Troubleshooting...
  • Page 425: Pj Outdoor Unit: Faulty Field Setting After Replacing Main Pc Board Or Faulty Combination Of Pc Board

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.43 Outdoor Unit: Faulty Field Setting after Replacing Main PC Board or Faulty Combination of PC Board Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of This malfunction is detected according to communications with the inverter. Malfunction Detection Malfunction...
  • Page 426 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Was the PC board (A1P) replaced with a substitute PC board? Is the model setting of the Make correct setting of substitute PC board...
  • Page 427: U0 Outdoor Unit: Gas Shortage Alert

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.44 Outdoor Unit: Gas Shortage Alert Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Detect gas shortage based on the temperature difference between low pressure or suction pipe Malfunction and heat exchanger.
  • Page 428 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. In cooling mode Set up a pressure gauge at the service port on the low pressure side.
  • Page 429: U1 Reverse Phase, Open Phase

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.45 Reverse Phase, Open Phase Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of The phase of each phase are detected by reverse phase detection circuit and right phase or Malfunction reverse phase are judged.
  • Page 430: U2 Outdoor Unit: Power Supply Insufficient Or Instantaneous Failure

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.46 Outdoor Unit: Power Supply Insufficient or Instantaneous Failure Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Detection of voltage of main circuit capacitor built in the inverter and power supply voltage. Malfunction Detection Malfunction...
  • Page 431 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check for power supply voltage. Voltage between phases: On-site causes. 380 to 415V Phase Make proper wire connections voltage: 220 without open phase, erroneous...
  • Page 432 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting <Single> <Multi> Check for connector connections: Remove Check for connector connections: Remove and insert the connectors shown below. and insert the connectors shown below. Furthermore, check the connectors for Furthermore, check the connectors for terminal conditions and continuity.
  • Page 433: U3 Outdoor Unit: Check Operation Not Executed

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.47 Outdoor Unit: Check Operation not Executed Remote Controller Display Applicable RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of Check operation is executed or not Malfunction Detection Malfunction Malfunction is decided when the unit starts operation without check operation. Decision Conditions Supposed...
  • Page 434: U4 Malfunction Of Transmission Between Indoor Units

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.48 Malfunction of Transmission between Indoor Units Remote Controller Display Applicable All models of indoor unit Models RXYQ72P~240PYDN, PTJU REYQ72P~240PYDN, PTJU Method of Microcomputer checks if transmission between indoor and outdoor units is normal. Malfunction Detection Malfunction...
  • Page 435 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. the indoor or outdoor unit PC board been replaced, or has the indoor - outdoor Push and hold the RESET or outdoor - outdoor unit button on the master outdoor...
  • Page 436 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. The high pressure sensor is connected to X32A of Connect the high pressure outdoor unit PC sensor and turn on again.
  • Page 437 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. The high pressure sensor is connected to X32A of Connect the high pressure sensor outdoor unit PC and turn on again.
  • Page 438 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. The low pressure sensor is connected to X31A (blue) Connect low pressure sensor of outdoor unit PC property and restart system.
  • Page 439: U5 Indoor Unit: Malfunction Of Transmission Between Remote Controller And Indoor Unit

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.49 Indoor Unit: Malfunction of Transmission between Remote Controller and Indoor Unit Remote Controller Display Applicable All models of indoor units Models Method of In case of controlling with 2-remote controller, check the system using microcomputer is signal Malfunction transmission between indoor unit and remote controller (main and sub) is normal.
  • Page 440: U7 Outdoor Unit: Transmission Failure (across Outdoor Units)

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.50 Outdoor Unit: Transmission Failure (Across Outdoor Units) Remote Controller Display Applicable All models of outdoor units Models Method of Microcomputer checks if transmission between outdoor units. Malfunction Detection Malfunction When transmission is not carried out normally for a certain amount of time Decision Conditions Supposed...
  • Page 441 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the LED lamps for “Check 3” corresponding to the malfunction code “...
  • Page 442 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 1 Check 3 Check 4 Check if any disconnection or connection error is detected in Correct the connecting wiring connecting wires with...
  • Page 443 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 2 Check 3 Check 4 Switch cooling/heating in Set the cooling/heating switch of a lump.
  • Page 444 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 3 Check 3 Check 4 Check the connection status of connecting wires of Multi Slave Correct the connecting wires of the 1 with outdoor multi.Check if the wiring is disconnected or is about to be...
  • Page 445 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 6 Check 3 Check 4 manual address settings (of the slave units 1 and 2) correct in Correct the manual address order to connect the settings.
  • Page 446: U8 Indoor Unit: Malfunction Of Transmission Between Main And Sub Remote Controllers

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.51 Indoor Unit: Malfunction of Transmission between Main and Sub Remote Controllers Remote Controller Display Applicable All models of indoor units Models Method of In case of controlling with 2-remote controller, check the system using microcomputer if signal Malfunction transmission between indoor unit and remote controller (main and sub) is normal.
  • Page 447: U9 Indoor Unit: Malfunction Of Transmission Between Indoor And Outdoor Units In The Same System

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.52 Indoor Unit: Malfunction of Transmission between Indoor and Outdoor Units in the Same System Remote Controller Display Applicable All models of indoor units Models RXYQ72P~240PYDN, PTJU REYQ72P~240PYDN, PTJU Method of Detection of a malfunction signal for the other indoor units within the circuit by outdoor unit PC Malfunction board.
  • Page 448: Ua Improper Combination Of Indoor And Outdoor Units, Indoor Units And Remote Controller

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.53 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Remote Controller Display Applicable All models of indoor unit RXYQ72P~240PYDN, PTJU Models REYQ72P~240PYDN, PTJU Method of A difference occurs in data by the type of refrigerant between indoor and outdoor units. The number of indoor units is out of the allowable range.
  • Page 449 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the LED lamps for “Check 3” corresponding to the malfunction code “ ”...
  • Page 450 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 1 Check 3 Check 4 The number of indoor units connected to the same refrigerant circurt system Replace the main PC board of should not be more than...
  • Page 451 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 3 Check 3 Check 4 Check Check if the outdoor if the unit is not unit PC board is replaced connected to outdoor...
  • Page 452 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 5 Check 3 Check 4 Is the model BSVQ-P Connect the model BSVQ-P. connected? Replace the outdoor unit PC board as shown below.
  • Page 453 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 7 Check 3 Check 4 Is the wiring between Correct the connection wiring. the BS units correct? Replace the BS unit PC board concerned.
  • Page 454: Uc Address Duplication Of Centralized Controller

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.54 Address Duplication of Centralized Controller Remote Controller Display Applicable All models of indoor unit Models Centralized controller Method of The principal indoor unit detects the same address as that of its own on any other indoor unit. Malfunction Detection Malfunction...
  • Page 455: Ue Malfunction Of Transmission Between Centralized Controller And Indoor Unit

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.55 Malfunction of Transmission between Centralized Controller and Indoor Unit Remote Controller Display Applicable All models of indoor units Intelligent Touch Controller Centralized controller Models Schedule timer Method of Microcomputer checks if transmission between indoor unit and centralized controller is normal. Malfunction Detection Malfunction...
  • Page 456 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the indoor unit for which “ ” is displayed. Is the the transmission Continued to A malfunction (UE) (on the following...
  • Page 457 Troubleshooting by Indication on the Remote Controller SiUS34-801A_b Troubleshooting Check the transmission wiring between central equipment for any broken Abnormal wire. For details, refer to Correct the wiring. information in the “Procedure for checking broken wires” section. (Refer to P.466) Normal Check the transmission...
  • Page 458: Uf System Is Not Set Yet

    SiUS34-801A_b Troubleshooting by Indication on the Remote Controller 3.56 System is not Set yet Remote Controller Display Applicable All models of indoor units Models RXYQ72P~240PYDN, PTJU REYQ72P~240PYDN, PTJU Method of On check operation, the number of indoor units in terms of transmission is not corresponding to that Malfunction of indoor units that have made changes in temperature.
  • Page 459: Uh Malfunction Of System, Refrigerant System Address Undefined

    Troubleshooting by Indication on the Remote Controller SiUS34-801A_b 3.57 Malfunction of System, Refrigerant System Address Undefined Remote Controller Display Applicable All models of indoor units Models RXYQ72P~240PYDN, PTJU REYQ72P~240PYDN, PTJU Method of Detect an indoor unit with no address setting. Malfunction Detection Malfunction...
  • Page 460 SiUS34-801A_b Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Does electricity a malfunction being introduce for occur even after 12 the first time after minutes elapses from the installation or after an indoor Normal...
  • Page 461: Troubleshooting (op: Central Remote Controller)

    Troubleshooting (OP: Central Remote Controller) SiUS34-801A_b Troubleshooting (OP: Central Remote Controller) PC Board Defect Remote Controller Display Applicable Central remote controller Intelligent Touch Controller Models Schedule timer Method of Detect an abnormality in the DIII-NET polarity circuit. Malfunction Detection Malfunction When + polarity and - polarity are detected at the same time.
  • Page 462: M8 Malfunction Of Transmission Between Optional Controllers For Centralized Control

    SiUS34-801A_b Troubleshooting (OP: Central Remote Controller) Malfunction of Transmission between Optional Controllers for Centralized Control Remote Controller Display Applicable Central remote controller Intelligent Touch Controller Models Schedule timer Method of DIII-NET transmission data (The system will be automatically reset.) Malfunction Detection Malfunction When no master controller is present at the time of the startup of slave controller.
  • Page 463 Troubleshooting (OP: Central Remote Controller) SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Were any changes made to the number of units of central equipment? (The central Reset the power supplies of equipment was connected once, every central equipment.
  • Page 464: Ma Improper Combination Of Optional Controllers For Centralized Control

    SiUS34-801A_b Troubleshooting (OP: Central Remote Controller) Improper Combination of Optional Controllers for Centralized Control Remote Controller Display Applicable Central remote controller Intelligent touch controller Schedule timer Models Method of Malfunction Detection DIII-NET When the schedule timer is set to individual use mode, but other central components are present. When multiple master controllers are present.
  • Page 465 Troubleshooting (OP: Central Remote Controller) SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Not available for combined Has the use with the remote control remote control adapter adapter.
  • Page 466: Mc Address Duplication, Improper Setting

    SiUS34-801A_b Troubleshooting (OP: Central Remote Controller) Address Duplication, Improper Setting Remote Controller Display Applicable Central remote controller Intelligent Touch Controller Models Schedule timer Method of Malfunction Detection DIII-NET Two or more units of central remote controllers and Intelligent Touch Controllers are connected, and all of them are set to master unit central setting or slave unit central setting.
  • Page 467 Troubleshooting (OP: Central Remote Controller) SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Did the malfunction Is the Master/ occur while in the first test Slave setting of the run using the intelligent central equipment Touch controller?
  • Page 468: Troubleshooting (op: Unified On/off Controller)

    SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) Troubleshooting (OP: Unified ON/OFF Controller) Operation Lamp Blinks Remote Operation lamp blinks Controller Display Applicable All model of indoor units Unified ON/OFF controller Models Method of Malfunction Detection DIII-NET Malfunction of transmission between optional central controller and indoor unit transmission data Malfunction...
  • Page 469: Troubleshooting

    Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is a malfunction code displayed on the Diagnose the cause with the remote controller? air conditioner's failure diagnosis manual.
  • Page 470 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) Display [Under Centralized Control] Blinks (Repeats Single Blink) Remote “under centralized control” (Repeats single blink) Controller Display Applicable Unified ON/OFF controller Models Central remote controller, Schedule timer Method of Detect the malfunction according to DIII-NET transmission data. Malfunction Detection Malfunction...
  • Page 471 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Has a once connected optional controller for centralized Reset power supply control been disconnected simultaneously for all optional or its address controllers for centralized...
  • Page 472 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) Is the wiring adaptor for Cannot be used in electrical appendices combination with a wiring connected? adaptor for electrical appendices. Remove the wiring adaptor for electrical appendices and reset the power supply for all optional controllers for centralized control simultaneously.
  • Page 473 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b Display [Under Centralized Control] Blinks (Repeats Double Blink) Remote “under centralized control” (Repeats double blink) Controller Display Applicable Unified ON/OFF controller Models Method of Detect the malfunction according to DIII-NET transmission data. Malfunction Detection Malfunction When no central control addresses are set to indoor units.
  • Page 474 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) [CHECK Check on connector of fan motor (Power supply cable) (1) Turn off the power supply. While disconnected, measure the resistance between phases U,V,W at the motor side connectors (3-conductor wire) to check that the values are balanced and that there is no short circuiting.
  • Page 475 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b [CHECK 3] Check the Factors of Overheat Operation Identify the defective points referring to the failure factor analysis (FTA) as follows. Hot gas circuit clogging Faulty hot Defective solenoid ← Check if coil resistance and insulation gas bypass valve coil control...
  • Page 476 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) [CHECK 4] Power Transistor Check Perform the following procedures prior to check. (1) Power Off. (2) Remove all the wiring connected to the PC board where power transistors are mounted on. ∗ Preparing a tester in the analog system is recommended. [Preparation] A tester in the digital system with diode check function will ·...
  • Page 477 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b [CHECK 5] Check for causes of rise in high pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points. ←Check to be sure the stop valve is open. Stop valve closed Local High pipe ←Conduct visual checks for pipe conditions.
  • Page 478 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) [CHECK 6] Check for causes of drop in low pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the faulty points. [In cooling] ←Are the electrical characteristics normal? Faulty low pressure sensor Faulty (See *1.) compressor...
  • Page 479 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b [CHECK 7] Broken Wire Check of the Connecting Wires 1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires: On the system shown below, turn OFF the power supply to all equipment, short-circuit between the outdoor-outdoor unit terminal parts F1 and F2 in the Outdoor Unit A that is farthest from the central remote controller, and then conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the central remote controller using a multiple meter.
  • Page 480 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) [CHECK 8] Master Unit Central Connector Setting Table The master unit central setting connector (CN1/X1A) is mounted at the factory. • To independently use a single unit of the intelligent Touch controller or a single unit of the central remote controller, do not dismount the master unit central setting connector (i.e., use the connector with the factory setting unchanged).
  • Page 481 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b [CHECK 9] Master-Slave Unit Setting Table Combination of Intelligent Touch Controller and Central Remote Controller Master Slave ∗ Pattern Master/ Master/ Master/ Master/ 1-00~4-15 5-00~8-15 1-00~4-15 5-00~8-15 Slave Slave Slave Slave Master Master Slave Slave Master —...
  • Page 482 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) [Check 10] Check for causes of wet operation. Referring to the Fault Tree Analysis (FTA) shown below, identify faulty points. Faulty crankcase heater Refrigerant accumulation Frequent ON/OFF of compressor ←Refer to information in the [Check 6] Overcharge of refrigerant section.
  • Page 483 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b [Check 11] Check for overcharge of refrigerant. In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to information provided below.
  • Page 484 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) [Check 12] Check for shortage of refrigerant. In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgment, refer to information provided below.
  • Page 485 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b [Check 13] Vacuuming and dehydration procedure Conduct vacuuming and dehydration in the piping system following the procedure for <Normal vacuuming and dehydration> described below. If moisture gets mixed in the piping system, follow the procedure for <Special vacuuming and dehydration>...
  • Page 486 SiUS34-801A_b Troubleshooting (OP: Unified ON/OFF Controller) [Check 14] List of inverter-related malfunction codes Code Name Condition for determining malfunction Major cause Instantaneous overcurrent of • Inverter output current exceeds 32.3A even • Liquid sealing inverter compressor instantaneously. • Faulty compressor •...
  • Page 487 Troubleshooting (OP: Unified ON/OFF Controller) SiUS34-801A_b [Check 15] Concept of inverter-related malfunction codes Transmission error When transmissions between the main PC board and the inverter Main (Control) PC board PC board are not normal Instantaneous overcurrent of inverter compressor (When inverter output current exceeds 460V units: 32.3A 230V units: 59.1A even instantaneously) Overcurrent of inverter compressor For 460V units...
  • Page 488 SiUS34-801A_b Part 6 Appendix 1. Piping Diagrams..................474 1.1 Outdoor Unit ..................... 474 1.2 Indoor Unit....................484 1.3 BS Unit ..................... 486 2. Wiring Diagrams for Reference...............487 2.1 Outdoor Unit ..................... 487 2.2 Field Wiring ....................497 2.3 Indoor Unit....................506 2.4 BS Unit .....................
  • Page 489: Piping Diagrams

    Piping Diagrams SiUS34-801A_b 1. Piping Diagrams Outdoor Unit Heat Pump 460V RXYQ72, 96, 120PYDN Appendix...
  • Page 490 SiUS34-801A_b Piping Diagrams Heat Pump 230V RXYQ72, 96, 120PTJU Appendix...
  • Page 491 Piping Diagrams SiUS34-801A_b Heat Pump 230V RXYQ144PTJU Appendix...
  • Page 492 SiUS34-801A_b Piping Diagrams Heat Recovery 460V REYQ72, 96, 120PYDN Appendix...
  • Page 493 Piping Diagrams SiUS34-801A_b Heat Recovery 460V REMQ72PYDN Appendix...
  • Page 494 SiUS34-801A_b Piping Diagrams Heat Recovery 460V REMQ96, 120PYDN Appendix...
  • Page 495 Piping Diagrams SiUS34-801A_b Heat Recovery 230V REYQ72, 96, 120PTJU Appendix...
  • Page 496 SiUS34-801A_b Piping Diagrams Heat Recovery 230V REYQ144PTJU Appendix...
  • Page 497 Piping Diagrams SiUS34-801A_b Heat Recovery 230V REMQ72PTJU Appendix...
  • Page 498 SiUS34-801A_b Piping Diagrams Heat Recovery 230V REMQ96, 120PTJU Appendix...
  • Page 499: Indoor Unit

    Piping Diagrams SiUS34-801A_b Indoor Unit FXFQ 12M / 18M / 24M / 30M / 36MVJU FXZQ 07M / 09M / 12M / 18M7VJU FXSQ 12M / 18M / 24M / 30M / 36M / 48MVJU FXMQ 30M / 36M / 48MVJU FXHQ 12M / 24M / 36MVJU FXAQ 07M / 09M / 12M / 18M / 24MVJU FXLQ 12M / 18M / 24MVJU...
  • Page 500 SiUS34-801A_b Piping Diagrams FXDQ 4D043864J Refrigerant pipe connection port diameters Model Liquid φ1/2 φ1/4 FXDQ07M / 09M / 12M / 18MVJU φ5/8 φ3/8 FXDQ24MVJU Appendix...
  • Page 501: Bs Unit

    Piping Diagrams SiUS34-801A_b BS Unit 4D057985A Appendix...
  • Page 502: Wiring Diagrams For Reference

    SiUS34-801A_b Wiring Diagrams for Reference 2. Wiring Diagrams for Reference Outdoor Unit Heat Pump 460V, RXYQ72, 96, 120PYDN Appendix...
  • Page 503 Wiring Diagrams for Reference SiUS34-801A_b Heat Pump 230, VRXYQ72, 96, 120PTJU Appendix...
  • Page 504 SiUS34-801A_b Wiring Diagrams for Reference Heat Pump 230V, RXYQ144PTJU Appendix...
  • Page 505 Wiring Diagrams for Reference SiUS34-801A_b Heat Recovery 460V, REYQ72, 96, 120PYDN Appendix...
  • Page 506 SiUS34-801A_b Wiring Diagrams for Reference Heat Recovery 460V, REMQ72PYDN Appendix...
  • Page 507 Wiring Diagrams for Reference SiUS34-801A_b Heat Recovery 460V REMQ96, 120PYDN Appendix...
  • Page 508 SiUS34-801A_b Wiring Diagrams for Reference Heat Recovery 230V REYQ72, 96, 120PTJU Appendix...
  • Page 509 Wiring Diagrams for Reference SiUS34-801A_b Heat Recovery 230V, REYQ144PTJU Appendix...
  • Page 510 SiUS34-801A_b Wiring Diagrams for Reference Heat Recovery 230V REMQ72PTJU Appendix...
  • Page 511 Wiring Diagrams for Reference SiUS34-801A_b Heat Recovery 230V REMQ96, 120PTJU Appendix...
  • Page 512: Field Wiring

    SiUS34-801A_b Wiring Diagrams for Reference Field Wiring Heat Pump 460V RXYQ72, 96, 120PYDN Appendix...
  • Page 513 Wiring Diagrams for Reference SiUS34-801A_b Heat Pump 460V RXYQ144, 168, 192, 216, 240PYDN Appendix...
  • Page 514 SiUS34-801A_b Wiring Diagrams for Reference Heat Pump 230V RXYQ72, 96, 120, 144PTJU Appendix...
  • Page 515 Wiring Diagrams for Reference SiUS34-801A_b Heat Pump 230V RXYQ168, 192, 216, 240PTJU Appendix...
  • Page 516 SiUS34-801A_b Wiring Diagrams for Reference Heat Recovery 460V REYQ72, 96, 120PYDN Appendix...
  • Page 517 Wiring Diagrams for Reference SiUS34-801A_b Heat Recovery 460V REYQ144, 168, 192, 216, 240PYDN Appendix...
  • Page 518 SiUS34-801A_b Wiring Diagrams for Reference Heat Recovery 230V REYQ72, 96, 120, 144PTJU Appendix...
  • Page 519 Wiring Diagrams for Reference SiUS34-801A_b Heat Recovery 230V REYQ168, 192, 216, 240PTJU Appendix...
  • Page 520: Indoor Unit

    SiUS34-801A_b Wiring Diagrams for Reference Indoor Unit FXFQ12M/18M/24M/30M/36MVJU 3D042620B FXZQ07M/09M/12M/18M7VJU PRINTED CIRCUIT BOARD CAPACITOR ( M1F ) FUSE ( B , 5A , 250V ) LIGHT EMITTING DIODE (SERVICE MONITOR GREEN) MAGNETIC RELAY ( M1P ) MOTOR ( INDOOR FAN ) t˚...
  • Page 521 Wiring Diagrams for Reference SiUS34-801A_b FXDQ07M/09M/12M/18M/24MVJU 3D050501A FXSQ12M/18M/24M/30M/36M/48MVJU 3D043177A Appendix...
  • Page 522 SiUS34-801A_b Wiring Diagrams for Reference FXMQ30M/36M/48MVJU 3D043176A FXAQ07M/09M/12M/18M/24MVJU 3D046039C Appendix...
  • Page 523 Wiring Diagrams for Reference SiUS34-801A_b FXHQ12M/24M/36M 3D048116 FXLQ12M/18M/24MVJU FXNQ12M/18M/24MVJU 3D045644A Appendix...
  • Page 524: Bs Unit

    SiUS34-801A_b Wiring Diagrams for Reference BS Unit BSVQ36P/60PVJU Appendix...
  • Page 525: List Of Electrical And Functional Parts

    List of Electrical and Functional Parts SiUS34-801A_b 3. List of Electrical and Functional Parts Outdoor Unit 3.1.1 RXYQ72P, 96P, 120PYDN Item Name Symbol Model Type JT1GCVDKYR@SA Inverter OC protection 14.7A device Compressor Type JT170G-KYE@T STD 1 OC protection 15.0A device OC protection Fan motor 3.0A...
  • Page 526 SiUS34-801A_b List of Electrical and Functional Parts 3.1.2 REYQ72PYDN~120PYDN Model Item Name Symbol REYQ72PYDN REYQ96PYDN REYQ120PYDN Type JT1GCVDKYR@SA Inverter OC protection 14.7A device Compressor Type JT170G-KYE@T STD 1 OC protection 15.0A device 3.0A OC protection Fan motor 3.0A (for General device overseas : 1.14A) Electronic expansion valve (Main)
  • Page 527 List of Electrical and Functional Parts SiUS34-801A_b 3.1.3 REMQ72PYDN Model Item Name Symbol REMQ72PYDN Type JT1GCVDKYR@SA Inverter OC protection 14.7A device Compressor Type — STD 1 OC protection — device OC protection Fan motor 3.0A device Electronic expansion valve (Main) Fully closed : 0pls Fully open : 480pls Electronic expansion valve (Refrigerant charge)
  • Page 528 SiUS34-801A_b List of Electrical and Functional Parts 3.1.4 REMQ96PYDN~120PYDN Model Item Name Symbol REMQ96PYDN REMQ120PYDN Type JT1GCVDKYR@SA Inverter OC protection 14.7A device Compressor Type JT170G-KYE@T STD 1 OC protection 15.0A device OC protection Fan motor 3.0A device Electronic expansion valve (Main) Fully closed : 0pls Fully open : 480pls Electronic expansion valve (Refrigerant charge)
  • Page 529: Indoor Side

    List of Electrical and Functional Parts SiUS34-801A_b Indoor Side 3.2.1 Indoor Units Model Parts Name Symbol Remark FXFQ FXFQ FXFQ FXFQ FXFQ 12MVJU 18MVJU 24MVJU 30MVJU 36MVJU Wired Remote BRC1D71 Controller Remote Option Controller Wireless Remote BRC7C812 Controller 1φ45W 6P 1φ90W 6P Fan Motor Thermal Protector 266°F : OFF...
  • Page 530 SiUS34-801A_b List of Electrical and Functional Parts Model Parts Name Symbol Remark FXDQ FXDQ FXDQ FXDQ FXDQ 07MVJU 09MVJU 12MVJU 18MVJU 24MVJU Wired Remote BRC1D71 Controller Remote Option Controller Wireless Remote BRC4C82 Controller 1φ62W 4P 1φ13W 4P Fan Motor ± ±...
  • Page 531 List of Electrical and Functional Parts SiUS34-801A_b Model Parts Name Symbol Remark FXMQ FXMQ FXMQ 30MVJU 36MVJU 48MVJU Wired Remote BRC1D71 Controller Remote Option Controller Wireless Remote BRC4C82 Controller 1φ160W 1φ270W 1φ430W Fan Motor Motors Thermal protector 275°F : OFF 188.6°F : ON Capacitor for Fan Motor 6μF 450V...
  • Page 532 SiUS34-801A_b List of Electrical and Functional Parts Model Parts Name Symbol Remark FXLQ FXLQ FXLQ 12MVJU 18MVJU 24MVJU Wired Remote BRD1C71 Controller Remote Option Controller Wireless Remote — Controller 1φ25W 1φ35W Fan Motor Motors Thermal protector 275°F : OFF 248°F : ON Capacitor for Fan Motor 0.5μF-450V 1.5μF-450V...
  • Page 533: Option List

    Option List SiUS34-801A_b 4. Option List Option List of Controllers Optional Accessories of Operation Control System Type FXFQ~M7VJU FXZQ-MVJU FXSQ~MVJU FXMQ~MVJU FXAQ~MVJU FXLQ~MVJU FXHQ~MVJU FXDQ~MVJU Item FXNQ~MVJU Wireless BRC7C812 — BRC4C82 BRC7E818 — BRC7E83 BRC4C82 Remote controller BRC1C71 Wired BRC1D71 Set back time clock BRC15A71 Remote sensor...
  • Page 534: Option Lists (outdoor Unit)

    SiUS34-801A_b Option List Option Lists (Outdoor Unit) RXYQ72~240PYDN Series VRV III Models RXYQ72PYDN RXYQ96PYDN RXYQ120PYDN RXYQ144PYDN RXYQ168PYDN RXYQ192PYDN RXYQ216PYDN RXYQ240PYDN RXYQ72PTJU RXYQ96PTJU RXYQ120PTJU RXYQ144PTJU RXYQ168PTJU RXYQ192PTJU RXYQ216PTJU RXYQ240PTJU Optional accessories KHRP26M22H (Max. 4 branch) KHRP26M22H (Max. 4 branch) Refnet KHRP26M22H (Max. 4 branch) KHRP26M33H (Max.
  • Page 535: Piping Installation Point

    Piping Installation Point SiUS34-801A_b 5. Piping Installation Point Piping between Outside Units (1) The piping between outside units must be installed level (Pattern 1) or with a rise (Pattern 2). Otherwise oil may pool in the pipes. Pattern 1 Front connections Unit Unit to indoor unit...
  • Page 536 SiUS34-801A_b Piping Installation Point Prohibited pattern Unit A Unit B Front connections to indoor unit Unit A Unit B Side (bottom) connections to indoor unit Oil remains in the stopping outside unit. Change to pattern 1 or pattern 2 Unit Unit Unit Unit...
  • Page 537 Piping Installation Point SiUS34-801A_b Appendix...
  • Page 538: Thermistor Resistance / Temperature Characteristics

    SiUS34-801A_b Thermistor Resistance / Temperature Characteristics 6. Thermistor Resistance / Temperature Characteristics Indoor unit For air suction For liquid pipe For gas pipe Outdoor unit For outdoor air For heat exchanger gas R2T, R11T For heat exchanger deicer R4T, R12T For sub cooling heat exchanger gas R5T, R13T For sub cool heat exchanger liquid R6T...
  • Page 539 Thermistor Resistance / Temperature Characteristics SiUS34-801A_b Outdoor Unit Thermistors for Discharge Pipe (R3T, R31T, R32T) T°F T°C kΩ T°F T°C kΩ T°F T°C kΩ 32.0 640.44 122.0 72.32 212.0 13.35 33.8 609.31 123.8 69.64 213.8 12.95 35.6 579.96 125.6 67.06 215.6 12.57 37.4...
  • Page 540: Pressure Sensor

    SiUS34-801A_b Pressure Sensor 7. Pressure Sensor = 1.38V-0.69 : Detected Pressure [High Side] = 0.57V-0.28 : Detected Pressure [Low Side] : High pressure : Output Voltage [High Side] V Detected Pressure : Low pressure : Output Voltage [Low Side] V V : Voltage (V) High Pressure (P Low Pressure (P...
  • Page 541: Method Of Checking The Inverter's Power Transistors And Diode Modules

    Pressure Sensor SiUS34-801A_b 8. Method of Checking the Inverter’s Power Transistors and Diode Modules Checking failures in power semiconductors mounted on inverter PC board Check the power semiconductors mounted on the inverter PC board by the use of a multiple tester. <Items to be prepared>...
  • Page 542 SiUS34-801A_b Pressure Sensor According to the tests made, it is you can determine if the malfunction is the result of a faulty inverter.The following section describes spossible causes of the faulty inverter: 1 Faulty compressor (ground leakage) 1 Faulty fan motor (ground leakage) 1 Entry of conductive foreign particles 1.
  • Page 543 Pressure Sensor SiUS34-801A_b Appendix...
  • Page 544: Example Of Connection

    SiUS34-801A 9. Example of Connection Heat Pump Appendix...
  • Page 546 SiUS34-801A Heat Pump Appendix...
  • Page 547 Heat Recovery...
  • Page 548 SiUS34-801A Appendix...
  • Page 550 SiUS34-801A_b Part 7 Precautions for New Refrigerant (R-410A) 1. Precautions for New Refrigerant (R-410A) ..........536 1.1 Service Tools.................... 538 Precautions for New Refrigerant (R-410A)
  • Page 551 Precautions for New Refrigerant (R-410A) SiUS34-801A_b 7. Precautions for New Refrigerant (R-410A) Outline 1.1.1 About Refrigerant R-410A Characteristics of new refrigerant, R-410A 1. Performance: Almost the same performance as R-22 and R-407C 2. Pressure: Working pressure is approx. 1.4 times more than R-22 and R-407C. 3.
  • Page 552 SiUS34-801A_b Precautions for New Refrigerant (R-410A) Thermodynamic characteristic of R-410A Temperature Steam pressure Density Specific heat at constant Specific enthalpy Specific entropy (kPa) (kg/m pressure (kJ/kgK) (kJ/kg) (kJ/KgK) Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Liquid Vapor Precautions for New Refrigerant (R-410A)
  • Page 553 Precautions for New Refrigerant (R-410A) SiUS34-801A_b Service Tools R-410A is used under higher working pressure, compared to previous refrigerants (R-22,R-407C). The refrigerating machine oil has been changed from Suniso oil to Ether oil, and if oil mixing occurs, sludge builds in the refrigerants and causes other problems. Therefore, gauge manifolds and charge hoses with a previous refrigerant (R-22,R-407C) cannot be used for products with new refrigerants.
  • Page 554 SiUS34-801A_b Precautions for New Refrigerant (R-410A) 1. Flaring tool Flare gauge Specifications 2 Dimension A Unit:mm Tube O.D. -0.4 Nominal size Class-2 (R-410A) Class-1 (Conventional) 6.35 9.1/32 9.0/32 9.52 13.2/32 13.0/32 12.70 16.6/32 16.2/32 15.88 19.7/32 19.4/32 19.05 23.3/32 Differences 2 Change of dimension A Dimension A For class-1: R-407C...
  • Page 555 Precautions for New Refrigerant (R-410A) SiUS34-801A_b 2. Torque wrench Specifications 2 Dimension B Unit:in Nominal size Class-1 Class-2 Previous 13/16 27/32 29/32 27/32 No change in tightening torque No change in pipes of other sizes Differences 2 Change of dimension B Only 1/2", 5/8"...
  • Page 556 SiUS34-801A_b Precautions for New Refrigerant (R-410A) 4. Leak tester Specifications 2 Hydrogen detecting type 2 Applicable refrigerants R-410A, R-407C, R-404A, R-507A, R-134a, etc. Differences 2 Previous testers detected chlorine. Since HFCs do not contain chlorine, the new tester detects hydrogen. 5.
  • Page 557 Precautions for New Refrigerant (R-410A) SiUS34-801A_b 2 1/4" → 5/16" (2min → 2.5min) 2 No oil is used in pressure test of gauges. → For prevention of contamination 2 Temperature scale indicates the relationship between pressure and temperature in gas saturated state.
  • Page 558 SiUS34-801A_b Precautions for New Refrigerant (R-410A) Regarding purchasing of service tools, please contact following address. Daikin U. S. Corporation (Dallas Office) 1645 Wallace Dr, Ste 110 Carrollton, TX 75006 Tel : 1-972-245-1510 Fax : 1-972-245-1038 Precautions for New Refrigerant (R-410A)
  • Page 559 Precautions for New Refrigerant (R-410A) SiUS34-801A_b Precautions for New Refrigerant (R-410A)
  • Page 560 SiUS34-801A_b Index Connectable Indoor Unit ..........6 Connectable Indoor Units Number and Capacity ..6 A0 ................338 Cooling Only/Heat-pump Setting ......244 A1 ................339 Current Sensor Malfunction ........380 A3 ................340 A6 ............342 A7 ................346 Defective Inverter PC Board ........393 A9 ..............
  • Page 561 SiUS34-801A_b Malfunction of High Pressure Sensor .....389 Malfunction of Indoor Unit Fan Motor .....344 Gas Shortage Alert ..........414 Malfunction of Inverter Radiating Fin Temperature Rise ..........395 Malfunction of Inverter Radiating Fin H7 ................377 Temperature Rise Sensor .......410 H9 ................379 Malfunction of Liquid Pipe Thermistor 1 Heat Exchanger Control ........
  • Page 562 SiUS34-801A_b Operation Lamp Blinks ........... 455 Transmission Failure (Across Outdoor Units) ..427 Outdoor Unit PC Board Layout ......94 Troubleshooting Overload / Overcurrent / (OP: Central Remote Controller) ......448 Lock of Indoor Unit Fan Motor ......345 (OP: Unified ON/OFF Controller) .....455 P1 ................
  • Page 563 SiUS34-801A_b Index...
  • Page 564 SiUS34-801A_b Drawings & Flow Charts Abnormal Discharge Pipe Temperature....374 Defective Inverter PC Board ........393 Abnormal Outdoor Fan Motor Signal ...... 377 Detailed Setting Procedure of Low Noise Operation and Actuation of High Pressure Switch......361 Demand Control ........112 Actuation of Low Pressure Sensor......
  • Page 565 SiUS34-801A_b Malfunction of Thermistor (R4T or R12T) for Outdoor Unit Heat Exchanger ........385 Heat Exchanger Control........49 Malfunction of Thermistor (R8T or R10T) Heater Control............297 for Suction Pipe ..........384 High Pressure Protection Control...... 64 Malfunction of Thermostat Sensor in Remote Controller ..........357 Malfunction of Transmission between Centralized Improper Combination of Indoor and Outdoor Units,...
  • Page 566 SiUS34-801A_b RXYQ72P, 96P, 120P ........18 Refrigerant Flow for Each Operation Mode..... 141 Wired Remote Controller .........301 Operation of Refrigerant Regulator .... 40 Wireless Remote Controller - Indoor Unit ....302 Pressure Equalizing when Switching Operation Wiring Diagrams for Reference Cooling/ Heating ........183 BS Unit .............511 REYQ144PTJU ..........
  • Page 567 AMERICAS 1645 Wallace Drive, Suite 110 Carrollton, TX75006 info@daikinac.com www.daikinac.com Specifications, designs and other content appearing in this brochure are current as of November 2009 but subject to change without notice. SiUS34-801A_b Printed in U.S.A. 11/2009 AK...

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