Page 1 SiBE341027 Heat Pump R-410A 50Hz RQYQ8-48PY1B...
Page 2: Table Of Contents
SiBE341027 Heat Pump R-410A 50Hz 1. Introduction .................... iv 1.1 Safety Cautions ..................iv 1.2 Used Icons .................... viii 1.3 Preface ....................ix Part 1 General Information ............1 1. Model Names of Indoor / Outdoor Units..........2 1.1 Indoor Units ....................2 1.2 Outdoor Units ...................3 1.3 Air Treatment Equipment .................3 2.
Page 3 SiBE341027 1.1 Operation Mode..................43 2. Detailed Control Functions..............44 2.1 Stop Operation ..................44 2.2 Standby ....................44 2.3 Startup Control ..................45 2.4 Normal Operation ...................46 2.5 Protection Control...................51 2.6 Special Control ..................57 Part 5 Test Operation ..............60 1. Test Operation ..................61 1.1 Procedure and Outline ................61 1.2 Check Operation ..................64 1.3 Checking in Normal Operation ...............67...
Page 4 SiBE341027 2.30 Reverse Phase, Open Phase...............151 2.31 Power Supply Insufficient or Instantaneous Failure ......152 2.32 Check Operation is not Executed............155 2.33 Transmission Error (between Indoor and Outdoor Units).....156 2.34 Transmission Error (between Remote Controller and Indoor Unit) ..159 2.35 Transmission Error (Across Outdoor Units) .........160 2.36 Transmission Error (between Main and Sub Remote Controllers)..166 2.37 Transmission Error (between Indoor and Outdoor Units in the Same System)....167...
Page 5: Introduction
SiBE341027 Introduction 1. Introduction Safety Cautions Cautions and Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “ Warning” and “ Caution”. The “ Warning” Warnings items are especially important since they can lead to death or serious injury if they are not followed closely.
Page 6 Introduction SiBE341027 Warning Be sure to wear a safety helmet, gloves, and a safety belt when working at a high place (more than 2 m). Insufficient safety measures may cause a fall accident. In case of R-410A refrigerant models, be sure to use pipes, flare nuts and tools for the exclusive use of the R-410A refrigerant.
Page 7 SiBE341027 Introduction 1.1.2 Cautions Regarding Safety of Users Warning Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools may cause an electrical shock, excessive heat generation or fire.
Page 8 Introduction SiBE341027 Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet securely. If the plug has dust or loose connection, it may cause an electrical shock or fire. Be sure to install the product correctly by using the provided standard For unitary type installation frame.
Page 9: Used Icons
SiBE341027 Introduction Caution Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 MΩ or higher. Defective insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Defective drainage may cause the water to enter the room and wet the furniture and floor.
Page 10: Preface
This is the new service manual for Daikin's Year 2011 VRVIII-Q 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 11: Part 1 General Information
SiBE341027 Part 1 General Information 1. Model Names of Indoor / Outdoor Units..........2 1.1 Indoor Units ....................2 1.2 Outdoor Units ...................3 1.3 Air Treatment Equipment .................3 2. External Appearance................4 2.1 Indoor Units ....................4 2.2 Outdoor Units ...................5 2.3 Air Treatment Equipment .................5 3.
Page 12: Model Names Of Indoor / Outdoor Units
Model Names of Indoor / Outdoor Units SiBE341027 1. Model Names of Indoor / Outdoor Units Indoor Units Capacity range 0.8HP 1.25HP 1.6HP 2.5HP 3.2HP 10HP Power Supply Capacity index 31.25 62.5 Ceiling Mounted FXFQ — 25P9 32P9 40P9 50P9 63P9 80P9 100P9 125P9 —...
Page 13: Outdoor Units
SiBE341027 Model Names of Indoor / Outdoor Units Outdoor Units Series Model Name Power Supply Heat Pump RQYQ Y1: 3 phase, 380-415V, 50Hz Air Treatment Equipment Outdoor-air processing unit Series Model name Power supply FXMQ 125MF 200MF 250MF HRV units (VKM series) Series Model name Power supply...
Page 14: External Appearance
External Appearance SiBE341027 2. External Appearance Indoor Units Ceiling mounted cassette (Round flow) type Ceiling mounted duct type FXFQ25P9VEB FXMQ200MAVE FXFQ32P9VEB FXMQ250MAVE FXFQ40P9VEB FXFQ50P9VEB FXFQ63P9VEB FXFQ80P9VEB FXFQ100P9VEB FXFQ125P9VEB Ceiling mounted cassette (Compact multi flow) type Ceiling suspended type FXZQ20M9V1B FXHQ32MAVE FXZQ25M9V1B FXHQ63MAVE FXZQ32M9V1B...
Page 15: Outdoor Units
SiBE341027 External Appearance Outdoor Units 8, 10, 12HP 14, 16HP 18, 20, 22, 24HP RQYQ18PY1B RQYQ8PY1B RQYQ20PY1B RQYQ14PY1B RQYQ10PY1B RQYQ22PY1B RQYQ12PY1B RQYQ16PY1B RQYQ24PY1B 26, 28HP 30, 32HP 34, 36, 38, 40HP RQYQ34PY1B RQYQ36PY1B RQYQ26PY1B RQYQ30PY1B RQYQ38PY1B RQYQ28PY1B RQYQ32PY1B RQYQ40PY1B 42, 44HP 46, 48HP RQYQ42PY1B RQYQ46PY1B...
Page 16: Combination Of Outdoor Units
38HP ●● ● 40HP Heat Pump: BHFP22P151 ● ●● 42HP ● ●● 44HP ● ●● 46HP ●●● 48HP Note: For multiple connection of 18HP system or more, an optional Daikin Outdoor Unit Multi Connection Piping Kit is required. General Information...
Page 17: Capacity Range
SiBE341027 Capacity Range 4. Capacity Range Combination ratio Connection capacity: 50% - 130% Total capacity index of the indoor units Combination ratio = Capacity index of the outdoor units Max. combination ratio Types of connected indoor units Type of connected Air Treatment Equipments FXMQ-MF Min.
Page 18 Capacity Range SiBE341027 Indoor unit connection capacity Types of connected indoor units Standard indoor units Type Capacity index Model name Max. number of Min. combination ratio Max. combination ratio connectable indoor units RQYQ8PY1B RQYQ10PY1B Single outdoor RQYQ12PY1B units RQYQ14PY1B RQYQ16PY1B RQYQ18PY1B RQYQ20PY1B RQYQ22PY1B...
Page 19: Features
SiBE341027 Features 5. Features Introduction Before replacement Reuse of existing piping After replacement Replace Replace Replace Replace * It is possible to keep R-22 indoor units from K-series and later version It is not possible to combine old R-22 and new R-410A indoor units in one system due to incompatibility of communication.
Page 20: Benefits Of System Replacement
Features SiBE341027 Benefits of System Replacement High COP Comparison of VRV III - Q and VRV K series Approx . Saves energy with high COP 4.27 Approx . increase 3.66 We have reached a higher level of efficiency, increase thanks to advanced features such as the heat 2.38 2.37 exchanger, the grille and the dual DC fans.
Page 21: System Flexibility
SiBE341027 Features System flexibility An increased number of connectable indoor units in a single system More indoor units can be connected in a single system, enabling consolidation of existing piping! The number of connectable indoor units has been drastically increased from 30 to 64. Conventional VRV K PLUS series: RX(Y) 24 - 30K :RQYQ40 - 48P...
Page 22: Procedure Of Reuse Of Existing Piping
Within the range Check the branch pipe. Usable if it is the branch pipe used for DAIKIN's VRV or if it is other manufacturer's T tube, Y tube, and header branch type and has a designed pressure of 3.3MPa or more. (Not usable in a special case, for example, Newly install and the pipe with pressure reduction.)
Page 23: Vacuum Drying
SiBE341027 Features (Continued for the previous page) Remove the existing equipment and wiring work Remove the existing indoor/outdoor units and remote controllers. Use sheathed vinyl cord or wire (2 wire) with 0.75 to 1.25 mm for the transmission New wiring work is wire and the remote controller wire.
Page 24: Guidelines For Reuse Of Existing Refrigerant Piping
When reuse R22 Indoor unit, use the flare nut for R-410A. For the thickness etc., refer to P.15. → Existing Daikin R-22 piping meets the minimum thickness of VRVIII-Q. >> The “insulation of gas pipe only” is not supported. Use the “insulation of both liquid and gas pipes”.
Page 25 The existing piping should meet the condition of design pressure 3.3MPa. Concretely, it should meet the minimum thickness for VRVIII-Q shown in the table below. → Existing Daikin R-22 piping meets the minimum thickness of VRVIII-Q. • The existing piping should not be corroded on the external appearance.
Page 26: Pipe Size Selection
Features SiBE341027 Reusability of existing piping for VRVIII-Q • Pipe size selection <for individual systems> <for multi-connecting systems> Indoor Unit Indoor Unit Outdoor Unit Outdoor Unit Part D Part D Part E Part A Part C Part A Part B Part E Piping size Type of piping...
Page 27: Part 2 Specifications
SiBE341027 Part 2 Specifications 1. Specifications ..................18 1.1 Outdoor Units ..................18 Specifications...
Page 28: Specifications
Specifications SiBE341027 1. Specifications Outdoor Units Model Name RQYQ8PY1B RQYQ10PY1B kcal / h 19,400 24,300 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 76,800 96,200 22.5 28.2 ★2 Cooling Capacity (19.0°CWB) 22.4 28.0 kcal / h 21,500 27,100 ★3 Heating Capacity Btu / h 85,300 107,000...
Page 29 SiBE341027 Specifications Model Name RQYQ12PY1B RQYQ14PY1B kcal / h 29,000 34,600 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 115,000 137,000 33.7 40.2 ★2 Cooling Capacity (19.0°CWB) 33.5 40.0 kcal / h 32,300 38,700 ★3 Heating Capacity Btu / h 128,000 154,000 37.5...
Page 30 Specifications SiBE341027 Model Name RQYQ16PY1B kcal / h 39,000 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 155,000 45.3 ★2 Cooling Capacity (19.0°CWB) 45.0 kcal / h 43,000 ★3 Heating Capacity Btu / h 171,000 50.0 Casing Colour Ivory White (5Y7.5/1) Dimensions: (H×W×D) 1680×1240×765 Heat Exchanger...
Page 31 SiBE341027 Specifications Model Name (Combination Unit) RQYQ18PY1B RQYQ20PY1B Model Name (Independent Unit) RQYQ8PY1B+RQYQ10PY1B RQYQ8PY1B+RQYQ12PY1B kcal / h 43,600 48,300 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 173,000 192,000 50.7 56.2 ★2 Cooling Capacity (19.0°CWB) 50.4 55.9 kcal / h 48,600 53,800 ★3 Heating Capacity...
Page 32 Specifications SiBE341027 Model Name (Combination Unit) RQYQ22PY1B RQYQ24PY1B Model Name (Independent Unit) RQYQ10PY1B+RQYQ12PY1B RQYQ12PY1B+RQYQ12PY1B kcal / h 53,200 58,000 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 211,000 230,000 61.9 67.4 ★2 Cooling Capacity (19.0°CWB) 61.5 67.0 kcal / h 59,300 64,500 ★3 Heating Capacity...
Page 33 SiBE341027 Specifications Model Name (Combination Unit) RQYQ26PY1B RQYQ28PY1B Model Name (Independent Unit) RQYQ10PY1B+RQYQ16PY1B RQYQ12PY1B+RQYQ16PY1B kcal / h 63,300 67,900 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 251,000 270,000 73.5 79.0 ★2 Cooling Capacity (19.0°CWB) 73.0 78.5 kcal / h 70,100 75,300 ★3 Heating Capacity...
Page 34 Specifications SiBE341027 Model Name (Combination Unit) RQYQ30PY1B RQYQ32PY1B Model Name (Independent Unit) RQYQ14PY1B+RQYQ16PY1B RQYQ16PY1B+RQYQ16PY1B kcal / h 73,500 78,000 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 292,000 310,000 85.5 90.6 ★2 Cooling Capacity (19.0°CWB) 85.0 90.0 kcal / h 81,700 86,000 ★3 Heating Capacity...
Page 35 SiBE341027 Specifications Model Name (Combination Unit) RQYQ34PY1B RQYQ36PY1B Model Name (Independent Unit) RQYQ10PY1B+RQYQ10PY1B+RQYQ14PY1B RQYQ10PY1B+RQYQ10PY1B+RQYQ16PY1B kcal / h 83,200 87,700 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 329,000 348,000 96.6 ★2 Cooling Capacity (19.0°CWB) 96.0 kcal / h 92,700 97,200 ★3 Heating Capacity Btu / h 368,000...
Page 36 Specifications SiBE341027 Model Name (Combination Unit) RQYQ38PY1B RQYQ40PY1B Model Name (Independent Unit) RQYQ10PY1B+RQYQ12PY1B+RQYQ16PY1B RQYQ12PY1B+RQYQ12PY1B+RQYQ16PY1B kcal / h 92,900 97,200 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 368,000 386,000 ★2 Cooling Capacity (19.0°CWB) kcal / h 102,000 108,000 ★3 Heating Capacity Btu / h 406,000 427,000...
Page 37 SiBE341027 Specifications Model Name (Combination Unit) RQYQ42PY1B RQYQ44PY1B Model Name (Independent Unit) RQYQ10PY1B+RQYQ16PY1B+RQYQ16PY1B RQYQ12PY1B+RQYQ16PY1B+RQYQ16PY1B kcal / h 102,000 108,000 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 406,000 427,000 ★2 Cooling Capacity (19.0°CWB) kcal / h 114,000 119,000 ★3 Heating Capacity Btu / h 450,000 471,000...
Page 38 Specifications SiBE341027 Model Name (Combination Unit) RQYQ46PY1B RQYQ48PY1B Model Name (Independent Unit) RQYQ14PY1B+RQYQ16PY1B+RQYQ16PY1B RQYQ16PY1B+RQYQ16PY1B+RQYQ16PY1B kcal / h 113,000 117,000 ★ 1 Cooling Capacity (19.5°CWB) Btu / h 447,000 464,000 ★2 Cooling Capacity (19.0°CWB) kcal / h 125,000 129,000 ★3 Heating Capacity Btu / h 495,000 521,000...
Page 39: Part 3 Refrigerant Circuit
SiBE341027 Part 3 Refrigerant Circuit 1. Refrigerant Circuit .................30 1.1 RQYQ8PY1B..................30 1.2 RQYQ10·12PY1B...................32 1.3 RQYQ14·16PY1B...................34 2. Functional Parts Layout ................36 2.1 RQYQ8PY1B..................36 2.2 RQYQ10·12PY1B...................37 2.3 RQYQ14·16PY1B...................38 3. Refrigerant Flow for Each Operation Mode...........39 3.1 RQYQ8~16PY1B ...................39 Refrigerant Circuit...
Page 40: Refrigerant Circuit
Refrigerant Circuit SiBE341027 1. Refrigerant Circuit RQYQ8PY1B No. in refrigerant Symbol Name Major Function system diagram Inverter compressor is operated on frequencies 52Hz to 266Hz by using Inverter compressor (INV.) the inverter. The number of operating steps is 24. Because the system is an air heat exchange type, the fan is operated 8- Inverter fan step rotation speed by using the inverter.
Page 41 SiBE341027 Refrigerant Circuit Refrigerant Circuit...
Page 42: Rqyq10·12Py1B
Refrigerant Circuit SiBE341027 RQYQ10·12PY1B No. in refrigerant Symbol Name Major Function system diagram Inverter compressor (INV.) Inverter compressor is operated on frequencies 52Hz to 210Hz by using the inverter. Standard compressor is operated with commercial power supply only. The number of operating steps is 31 when inverter Standard compressor 1 (STD1) compressor is operated in combination with standard compressor.
Page 43 SiBE341027 Refrigerant Circuit Refrigerant Circuit...
Page 44: Rqyq14·16Py1B
Refrigerant Circuit SiBE341027 RQYQ14·16PY1B No. in refrigerant Symbol Name Major Function system diagram Inverter compressor (INV.) Inverter compressor is operated on frequencies 52Hz to 210Hz by using the inverter. Standard compressor is operated with commercial power Standard compressor 1 (STD1) supply only.
Page 45 SiBE341027 Refrigerant Circuit Refrigerant Circuit...
Page 46: Functional Parts Layout
Functional Parts Layout SiBE341027 2. Functional Parts Layout RQYQ8PY1B Top View Solenoid valve (Refrigerant Solenoid valve regulator gas vent pipe) (Oil regulator outlet) Electronic expansion valve (Y11S) (Y9S) (Subcooling) (Y2E) Solenoid valve (Refrigerant Thermistor regulator gas pipe) (Subcooling heat (Y13S) exchanger outlet) Solenoid valve (Mixing unit (R5T)
Page 47: Rqyq10·12Py1B
SiBE341027 Functional Parts Layout RQYQ10·12PY1B Top View Solenoid valve (Refrigerant Solenoid valve regulator gas vent pipe) (Oil regulator outlet) Solenoid valve (Refrigerant regulator gas pipe) (Y11S) (Y9S) Electronic expansion valve (Y13S) (Subcooling) Solenoid valve (Mixing unit (Y2E) inlet) Thermistor (Subcooling (Y4S) heat exchanger outlet) Solenoid valve (Circuit of...
Page 48: Rqyq14·16Py1B
Functional Parts Layout SiBE341027 RQYQ14·16PY1B Top View Solenoid valve (Oil regulator outlet) Solenoid valve (Main (Y9S) Solenoid valve (Refrigerant electronic expansion Electronic expansion valve regulator liquid pipe) valve bypass) (Subcooling) Solenoid valve (Mixing unit inlet) (Y12S) (Y10S) (Y3E) (Y4S) Solenoid valve (Hot gas) Solenoid valve (Circuit of oil return) (Y1S) (Y5S)
Page 49: Refrigerant Flow For Each Operation Mode
SiBE341027 Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode RQYQ8~16PY1B Cooling operation "High temperature, high pressure gas" "High temperature, high pressure liquid" "Low temperature, low pressure" Indoor unit operation "ON" (Cooling) Indoor unit operation "OFF" (Cooling) Indoor unit operation "ON"...
Page 50 Refrigerant Flow for Each Operation Mode SiBE341027 Cooling oil return / Heating oil return / Defrost operation "High temperature, high pressure gas" "High temperature, high pressure liquid" "Low temperature, low pressure" Indoor unit operation "ON" (Cooling) Indoor unit operation "OFF" (Cooling) Indoor unit operation "ON"...
Page 51: Heating Operation
SiBE341027 Refrigerant Flow for Each Operation Mode Heating operation "High temperature, high pressure gas" "High temperature, high pressure liquid" "Low temperature, low pressure" Indoor unit operation "ON" (Heating) Indoor unit operation "OFF" (Heating) Indoor unit operation "ON" (Heating) Thermostat "ON" Thermostat "OFF"...
Page 52: Part 4 Function
SiBE341027 Part 4 Function 1. Function General...................43 1.1 Operation Mode..................43 2. Detailed Control Functions..............44 2.1 Stop Operation ..................44 2.2 Standby ....................44 2.3 Startup Control ..................45 2.4 Normal Operation ...................46 2.5 Protection Control...................51 2.6 Special Control ..................57 Function...
Page 53: Function General
SiBE341027 Function General 1. Function General Operation Mode 2-1. Stop operation Thermostat ON Indoor unit (If test run has not been completed, the error code "U3" is displayed stop or and the unit will not operation. However this does not apply to test thermostat run in service mode, refrigerant charging, and pump down.) 2.2.
Page 54: Detailed Control Functions
Detailed Control Functions SiBE341027 2. Detailed Control Functions Stop Operation 2.1.1 Stop due to Error In order to protect compressors, if any of the abnormal state occurs, the system will make "stop with thermostat OFF" and the error will be determined according to the number of retry times. (Refer to "Error code and description"...
Page 55: Startup Control
SiBE341027 Detailed Control Functions 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. 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 56: Normal Operation
Detailed Control Functions SiBE341027 Normal Operation 2.4.1 List of Functions in Normal Operation Electric Symbol Part Name Normal Cooling Normal Heating RQYQ8P PQYQ10·12P PQYQ14·16P Compressor – PI Control PI Control – – Depends on the Depends on the Outdoor unit fan M1F, M2F mode of the cooling mode of the cooling...
Page 57: Compressor Pi Control
SiBE341027 Detailed Control Functions 2.4.2 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 achieve target value (TeS). Te set value (Make this setting while in Setting mode 2.) Te setting M (Normal)
Page 58 Detailed Control Functions SiBE341027 2.4.3 Outdoor Unit Rotation In the case of multi-outdoor-unit system, this outdoor unit rotation is used to prevent the compressor from burning out due to unbalanced oil level between outdoor units. [Details of outdoor unit rotation] In case of multi-outdoor-unit system, each outdoor unit is given an operating priority for the control.
Page 59 SiBE341027 Detailed Control Functions 2.4.4 Compressor Step Control Compressor operations vary with the following steps according to information in “2.4.2 Compressor PI Control”. RQYQ8PY1B RQYQ10 ·12PY1B RQYQ14 ·16PY1B STEP STEP STEP INV. INV. STD1 INV. STD1 STD2 52Hz 52Hz 52Hz 57Hz 57Hz 57Hz...
Page 60: Electronic Expansion Valve Pi Control
Detailed Control Functions SiBE341027 2.4.5 Electronic Expansion Valve PI Control Main electronic expansion valve control When the outdoor unit heat exchanger is performed via the evaporator, this function is used to exert PI control on the electronic expansion valve (Y1E) so that the evaporator outlet superheated degree (SH) will become constant.
Page 61: Protection Control
SiBE341027 Detailed Control Functions Protection Control 2.5.1 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. [In cooling] In case of multi-outdoor-unit system, each outdoor unit performs this control individually in the following sequence.
Page 62: Low Pressure Protection Control
Detailed Control Functions SiBE341027 2.5.2 Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. [In cooling] In case of multi-outdoor-unit system, the following control is performed in the entire system. Normal operation Pe <...
Page 63 SiBE341027 Detailed Control Functions [In heating] In case of multi-outdoor-unit system, each outdoor unit performs this control individually in the following sequence. Normal operation •Pe > 0.23 MPa & •Compressor step = Max. step Pe < 0.17 MPa •Pe > 0.20 MPa &...
Page 64: Discharge Pipe Protection Control
Detailed Control Functions SiBE341027 2.5.3 Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against an error or transient increase of discharge pipe temperature. In case of multi-outdoor-unit system, each outdoor unit performs this control individually in the following sequence.
Page 65: Inverter Protection Control
SiBE341027 Detailed Control Functions 2.5.4 Inverter Protection Control Inverter current protection control and inverter fin temperature control are performed to prevent tripping due to an error, or transient inverter overcurrent, and fin temperature increase. [Inverter overcurrent protection control] In the case of multi-outdoor-unit system, each INV. compressor performs these controls in the following sequence. Normal operation Inverter current value •...
Page 66 Detailed Control Functions SiBE341027 2.5.5 STD Compressor Overload Protection This control is used to prevent abnormal heating due to overcurrent to the compressor resulting from failures of STD compressor such as locking. STD compressor ON Demand to operate. CT detection current value>28.8A Stop due to error STD compressor OFF for 30 min.
Page 67: Special Control
SiBE341027 Detailed Control Functions Special Control 2.6.1 Oil Return Operation In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil flown out from the compressor to the system side. (1) Oil Return Operation in Cooling [Start conditions] Referring to the set conditions for the following items, start the oil return operation in cooling.
Page 68 Detailed Control Functions SiBE341027 (2) Oil Return Operation in Heating [Start conditions] Referring to the set conditions for the following items, start the oil return operation in heating. • 2 hours after initial power ON • A lapse of every 1 ~ 2 hours during low-load operation •...
Page 69: Defrost Operation
SiBE341027 Detailed Control Functions 2.6.2 Defrost Operation To defrost the outdoor unit heat exchanger while in heating operation, the defrost operation is conducted to recover the heating capacity. [Start conditions] Referring to the set conditions for the following items, start the defrosting operation. •...
Page 70: Part 5 Test Operation
SiBE341027 Part 5 Test Operation 1. Test Operation ..................61 1.1 Procedure and Outline ................61 1.2 Check Operation ..................64 1.3 Checking in Normal Operation ...............67 2. Field Setting from Outdoor Unit.............68 2.1 Field Setting from Outdoor Unit..............68 Test Operation...
Page 71: Test Operation
Is the amount of additional refrigerant charge recorded in the [Service Precaution] label? Check to be sure the stop valves are under the following conditions. Check the stop valves for Liquid side Gas side conditions. Model stop valve stop valve Open Open RQYQ8-48PY1B Test Operation...
Page 72 Test Operation SiBE341027 * How to calculate additional refrigerant charging amount (Unit: 0.1 kg) Total length of Total length of Total length of φ22.2-mm φ19.1-mm φ15.9-mm × 0.37 × 0.26 × 0.18 liquid pipe) liquid pipe) liquid pipe) Total length of Total length of Total length of φ9.5-mm...
Page 73 SiBE341027 Test Operation 1.1.2 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 PCB.
Page 74: Check Operation
Test Operation SiBE341027 Check Operation 1.2.1 RQYQ-P Make sure to carry out the check operation after the initial installation. Otherwise, the error code "U3" will be displayed on the remote controller and normal operation cannot be carried out. In the check operation, the following checks and judgement will be performed: (1) Check of the stop valve opening (2) Check for wrong wiring (3) Recovery of contamination...
Page 75 SiBE341027 Test Operation Close the refrigerant cylinder valve. After checking that the LED h l h h k k h Waits for conditions to stabilize after restart. display is normal, press the TEST button (BS4) again. h l h h k k k Contamination operation (30 ~ 60 minutes) Up to 1 hour may be required.
Page 76: Remote Controller Displays Error Code
Test Operation SiBE341027 [Remote controller displays error code] Error code Installation trouble Corrective action E3 F3 The outdoor unit stop valve has not been opened. Check that the gas and liquid side stop valves are open. E4 UF Instruction to perform additional refrigerant Follow the procedure for check operation (refer to the charging during check operation (not an error) previous page) and perform additional refrigerant charge.
Page 77: Checking In Normal Operation
SiBE341027 Test Operation Checking in Normal Operation After check operation ends, start normal operation. (Heating is not possible if the outdoor air temperature is 24°C or higher.) • Check that the indoor and outdoor units are operating normally. (If any abnormal noise occurs due to liquid compression in the compressor or another cause, stop operation immediately.
Page 78: Field Setting From Outdoor Unit
Field Setting from Outdoor Unit SiBE341027 2. Field Setting from Outdoor Unit Field Setting from Outdoor Unit 2.1.1 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 79 SiBE341027 Field Setting from Outdoor Unit (2) Service setting items Setting item Content and objective of setting Overview of setting procedure Indoor unit fan Used to operate the indoor unit in the Set No. 5 of "Setting mode 2" to indoor unit forced H operation stopped state in forced H operation mode.
Page 80 Field Setting from Outdoor Unit SiBE341027 2.1.2 Setting by DIP switches (1) Setting of factory set Using DIP switches on the PCB enables field setting shown below. However, make no changes of factory settings except for DS1-1. DIP switch Setting item Description Setting COOL/HEAT select setting is made with the use of a Cool/Heat...
Page 81 SiBE341027 Field Setting from Outdoor Unit 2.1.3 Setting by BS button The following settings are made by BS button on PCB. In case of multi-outdoor unit system, various items should be set with the master unit. (Setting with the slave unit is disabled.) LED display COOL/HEAT select Demand...
Page 82 Field Setting from Outdoor Unit SiBE341027 a. “Setting mode 1” This mode is used to set and check the following items. 1. Set items ············ In order to make COOL/HEAT selection in a batch of outdoor unit group, change the setting. •...
Page 83 SiBE341027 Field Setting from Outdoor Unit 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) Press and hold the MODE (BS1) button for 5 seconds and set to Cool/heat unified Sets address for cool/heat unified operation.
Page 84 Field Setting from Outdoor Unit SiBE341027 Setting item Description Setting of difference Make the setting when the outdoor unit is installed 40 m in height for the or more below the indoor unit. outdoor unit Emergency operation (Setting for the master unit operation prohibition in multi-...
Page 85 SiBE341027 Field Setting from Outdoor Unit Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory set k h h h h h h ∗ Address k h h h h h k Binary number Digital pressure gauge kit display...
Page 86 Field Setting from Outdoor Unit SiBE341027 Setting item display C/H selection Setting condition display MODE TEST Demand Setting item noise Master Slave ∗ Factory set k h h h h h k ∗ Refrigerant Refrigerant recovery / vacuuming: OFF recovery/vacuuming k h h h h k h Refrigerant recovery / vacuuming: ON mode setting...
Page 87 SiBE341027 Field Setting from Outdoor Unit c. Monitor mode LED display Setting item Data display l h h h h h h To enter the monitor mode, press the Various settings Lower 4 digits MODE (BS1) button when in l h h h h h k “Setting mode 1”.
Page 88 Field Setting from Outdoor Unit SiBE341027 Setting item 0 Display contents of “Number of units for various settings” l h h k h h h EMG operation / backup operation l h h h h h h setting l h h h k h h Defrost select setting Short l h h h l h h...
Page 89 SiBE341027 Field Setting from Outdoor Unit 2.1.4 Cool / Heat Mode Selection There are the following 5 cool/heat select modes. Set cool/heat separately for each outdoor unit system by indoor unit remote controller. Set cool/heat separately for each outdoor unit system by cool/heat selector. Set cool/heat for more than one outdoor unit system simultaneously in accordance with unified master outdoor unit by indoor unit remote controller.
Page 90 Field Setting from Outdoor Unit SiBE341027 Set Cool / Heat Separately for Each Outdoor Unit System by Cool / Heat Selector It does not matter whether or not there is outdoor - outdoor unit wiring. Set outdoor unit PCB DS1-1 to OUT (factory setting). Set C/H select to IND (individual) for “Setting mode 1”...
Page 91 SiBE341027 Field Setting from Outdoor Unit Set Cool / Heat for More Than One Outdoor Unit System Simultaneously in Accordance with Unified Master Outdoor Unit by Indoor Unit Remote Controller Install the external control adaptor for outdoor unit on either the outdoor-outdoor, indoor-outdoor transmission line.
Page 92 Field Setting from Outdoor Unit SiBE341027 Set Cool / Heat for More Than One Outdoor Unit System Simultaneously in Accordance with Unified Master Outdoor Unit by Cool / Heat Select Remote Controller Install the external control adaptor for outdoor unit on either the outdoor-outdoor, indoor-outdoor transmission line.
Page 93 SiBE341027 Field Setting from Outdoor Unit Supplementation on When switching cool/heat for each adaptor PCB with the use of more than one adaptor PCB, set the address of the external control adaptor for outdoor unit PCB DS1 and DS2 so that it matches the unified cool/heat address of outdoor unit main PCB.
Page 94 Field Setting from Outdoor Unit SiBE341027 Set cool/heat at all outdoor unit systems simultaneously for each external control adaptor for outdoor unit by using the centralized remote controller. Install the external control adaptor for outdoor unit (optional) onto the outdoor-outdoor, indoor-outdoor, or indoor-indoor transmission line.
Page 95 SiBE341027 Field Setting from Outdoor Unit 2.1.5 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 for outdoor unit (optional), you can lower operating noise by 2-3 dB. Setting Content Mode 1...
Page 96 Field Setting from Outdoor Unit SiBE341027 2.1.6 Setting of Demand Operation By connecting the external contact input to the demand input of the outdoor unit external control adaptor for outdoor unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition.
Page 97 SiBE341027 Field Setting from Outdoor Unit 2.1.7 Air Tight Test Procedure After internal servicing is performed onsite, perform the air tight test. Fully open the electronic expansion valves of the outdoor unit and indoor unit, and turn ON some of the solenoid valves. [Operation procedure] With the system stopped, use "Setting mode 2"...
Page 98: Emergency Operation
Field Setting from Outdoor Unit SiBE341027 2.1.10 Emergency Operation If the compressor cannot operate, this control inhibits any applicable compressor or outdoor unit from operating to perform emergency operation only with the operative compressor or outdoor unit. Caution In order to disable the compressor operation due to a failure or else, be sure to do so in emergency operation mode.
Page 99 SiBE341027 Field Setting from Outdoor Unit (2) In the Case of Multi-Outdoor-Unit System [Automatic backup operation] With multi-outdoor-unit system, if a certain outdoor unit system errors (i.e., the system stops and indoor unit remote controller displays the error), by resetting the system with the indoor unit remote controller, the applicable outdoor unit is inhibited from operating for 8 hours, thus making it possible to perform backup operation automatically.
Page 100: Part 6 Service Diagnosis
SiBE341027 Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............92 2. Troubleshooting by Remote Controller ..........95 2.1 Procedure of Self-diagnosis by Remote Controller ........95 2.2 PCB Abnormality ..................104 2.3 Actuation of High Pressure Switch or Pressure Switch......105 2.4 Actuation of High Pressure Switch (S1PH) or Pressure Switch (S2P) .................106 2.5 Actuation of Low Pressure Sensor ............108 2.6 Inverter Compressor Motor Lock............110...
Page 101 SiBE341027 2.40 Transmission Error (between Centralized Controller and Indoor Unit) ........173 2.41 System is not Set yet................176 2.42 System Error, Refrigerant System Address Undefined ......177 2.43 Check ....................179 Service Diagnosis...
Page 102: Symptom-Based Troubleshooting
Symptom-based Troubleshooting SiBE341027 1. Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure The 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 103 SiBE341027 Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure The system This symptom occurs The system is in preparation Wait for a period of approximately conducts fan immediately after turning ON mode of operation. 10 minutes. operation but not the power supply. cooling or "UNDER CENTRALIZED Even though, the cooling or...
Page 104 Symptom-based Troubleshooting SiBE341027 Symptom Supposed Cause Countermeasure 11 The system <Indoor unit> These are operating sounds of Normal operation. produces Immediately after turning ON the electronic expansion valve of This sound becomes low after a sounds. the power supply, indoor unit the indoor unit.
Page 105: Troubleshooting By Remote Controller
SiBE341027 Troubleshooting by Remote Controller 2. Troubleshooting by Remote Controller Procedure of Self-diagnosis by Remote Controller 2.1.1 Wired Remote Controller — BRC1D528 If operation stops due to error, the remote controller’s operation LED blinks, and error code is displayed. (Even if stop operation is carried out, error contents are displayed when the inspection mode is entered.) The error code enables you to tell what kind of error caused operation to stop.
Page 106 Troubleshooting by Remote Controller SiBE341027 2.1.2 Wired Remote Controller — BRC1E51A7 The following will be displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Screen Operation lamp (1)Checking an error or warning...
Page 107: Wireless Remote Controller
SiBE341027 Troubleshooting by Remote Controller 2.1.3 Wireless Remote Controller If unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit flashes. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
Page 108 Troubleshooting by Remote Controller SiBE341027 Normal status Enters inspection mode from normal status when the INSPECTION/ TEST button is pressed. 1 Press INSPECTION/TEST button. If no button is pressed for 1 minute, equipment returns to normal status. 3 Press MODE selector button.
Page 109 SiBE341027 Troubleshooting by Remote Controller k: ON h: OFF l: Blink Operation Error contents Page Error code lamp Referred Outdoor Unit PCB abnormality Actuation of high pressure switch or pressure switch Actuation of high pressure switch or pressure switch Actuation of low pressure sensor Inverter compressor motor lock STD compressor motor overcurrent/Lock Outdoor unit fan motor abnormality...
Page 110 Troubleshooting by Remote Controller SiBE341027 Error code indication by outdoor unit PCB Error Error code Description of error Description of error (PGF) Remote controller <Monitor mode> PCB abnormality Defective PCB To enter the monitor mode, press the Abnormal discharge pressure or field HPS or PS activated MODE (BS1) button when in “Setting piping pressure...
Page 111: Service Diagnosis
SiBE341027 Troubleshooting by Remote Controller k : ON h : OFF l : Blink Error code Confirmation of error 1 (Check 1) Confirmation of error 2 (Check 2) Confirmation of error 3 (Check 3) Confirmation of error 4 (Check 4) 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...
Page 112 Troubleshooting by Remote Controller SiBE341027 <Monitor mode> Error Error code To enter the monitor mode, press the Description of error Description of error (PGF) Remote controller MODE (BS1) button when in “Setting Inverter PCB abnormality Defective IPM mode 1”. Current sensor error confirmation 1 Current sensor error confirmation 2 IGBT error * Refer to P.
Page 113 SiBE341027 Troubleshooting by Remote Controller k : ON h : OFF l : Blink Error code Confirmation of error 1 (Check 1) Confirmation of error 2 (Check 2) Confirmation of error 3 (Check 3) Confirmation of error 4 (Check 4) 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 Display of contents of...
Page 114: Pcb Abnormality
Troubleshooting by Remote Controller SiBE341027 PCB Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Abnormality is detected under the communication conditions in the hardware section between the indoor unit and outdoor unit. Detection Error Decision When the communication conditions in the hardware section between the indoor unit and the outdoor unit are not normal.
Page 115: Actuation Of High Pressure Switch Or Pressure Switch
SiBE341027 Troubleshooting by Remote Controller Actuation of High Pressure Switch or Pressure Switch Remote Controller Display Applicable RQYQ-PY1B Models Method of Error The error is detected by the relationship between "pressure detected by the high pressure sensor" and "operation of the high pressure switch or pressure switch". Detection Error Decision When the high pressure switch or pressure switch operates under low pressure detected by the...
Page 116: Actuation Of High Pressure Switch (S1Ph) Or Pressure Switch (S2P)
Troubleshooting by Remote Controller SiBE341027 Actuation of High Pressure Switch (S1PH) or Pressure Switch (S2P) Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Abnormality is detected by the protection device circuit that detects continuity at the high pressure switch and pressure switch. Detection Error Decision When the contact of the high pressure switch or pressure switch opens.
Page 117: Troubleshooting
SiBE341027 Troubleshooting by Remote Controller 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. (1) Is the stop valve opened? (2) Are the high pressure switch and pressure switch connector properly connected to the main PCB? (3) Do the high pressure switch and pressure switch have continuity?
Page 118: Actuation Of Low Pressure Sensor
Troubleshooting by Remote Controller SiBE341027 Actuation of Low Pressure Sensor Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Abnormality is detected by the pressure value of the low pressure sensor with the outdoor unit main PCB (A1P). Detection Error Decision Error is generated when the low pressure is dropped under compressor operation.
Page 119 SiBE341027 Troubleshooting by Remote Controller 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 opened? (1) Mount a pressure gauge on the low pressure service port.
Page 120: Inverter Compressor Motor Lock
Troubleshooting by Remote Controller SiBE341027 Inverter Compressor Motor Lock Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Inverter PCB takes the position signal from UVW line connected between the inverter and compressor, and the error is detected when any abnormality is observed in the phase-current Detection waveform.
Page 121 SiBE341027 Troubleshooting by Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the stop valve Local factor open? Open the stop valve. Are the relay wires Replace the relay wires and to the compressor ensure right connection of the...
Page 122: Std Compressor Motor Overcurrent/Lock
Troubleshooting by Remote Controller SiBE341027 STD Compressor Motor Overcurrent/Lock Remote Controller Display Applicable RQYQ10P~16PY1B Models Method of Error Detects the overcurrent with current sensor (CT). Detection Error Decision Error is decided when the detected current value exceeds 28.8 A for 2 seconds. Conditions Supposed Stop valve is not opened...
Page 123: Outdoor Unit Fan Motor Abnormality
SiBE341027 Troubleshooting by Remote Controller Outdoor Unit Fan Motor Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Detect an error based on the current value in the inverter PCB (as for motor 2, current value in the fan PCB). Detection Detect an error malfunction for the fan motor circuit based on the number of rotation detected by hole IC during the fan motor operation.
Page 124 Troubleshooting by Remote Controller SiBE341027 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 Check fan motor (fan motor1, 2) corresponding to error code “ ”...
Page 125 SiBE341027 Troubleshooting by Remote Controller Troubleshooting No continuity of Replace the fan INV. PCB. fuse (F1U) on the fan INV. PCB. Remove the fan motor connector. Is Replace the corresponding the fan rotatable fan motor. easily by hand? Resistance value between the power supply wire Replace the corresponding terminal of fan motor and...
Page 126: Electronic Expansion Valve Coil Abnormality (Y1E~Y3E)
Troubleshooting by Remote Controller SiBE341027 Electronic Expansion Valve Coil Abnormality (Y1E~Y3E) Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Check the continuity of electronic expansion valve coil (Y1E) Detection Error Decision No current is detected in the common (COM [+]) when power supply is ON. Conditions Supposed Disconnection of connectors for electronic expansion valve (Y1E)
Page 127 SiBE341027 Troubleshooting by 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 once and then turn it ON again. Return to normal? External factor other than error (for example, noise etc.).
Page 128: Abnormal Discharge Pipe Temperature
Troubleshooting by Remote Controller SiBE341027 2.10 Abnormal Discharge Pipe Temperature Remote Controller Display Applicable RQYQ-PY1B Models Method of Error The error is detected according to the temperature detected by the discharge pipe temperature sensor. Detection Error Decision When the discharge pipe temperature rises to an abnormally high level (135 °C or more) When the discharge pipe temperature rises suddenly (120 °C or more continues for 10 minutes) Conditions Supposed...
Page 129 SiBE341027 Troubleshooting by 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. Reset the operation and start operation again. Is the discharge pipe thermistor Replace the discharge pipe property normal? thermistor.
Page 130: Humidity Alarm
Troubleshooting by Remote Controller SiBE341027 2.11 Humidity Alarm Remote Controller Display Applicable RQYQ-PY1B Models Method of Error The condition of the liquid refrigerant returning to the compressor is detected by the temperature and pressure of any part during the cooling operation. Detection Error Decision When the following humidity condition continues for 30 minutes...
Page 131 SiBE341027 Troubleshooting by 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. Set up a pressure gauge at the service port on the high pressure side.
Page 132: Refrigerant Overcharged
Troubleshooting by Remote Controller SiBE341027 2.12 Refrigerant Overcharged Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Excessive charging of refrigerant is detected by using the outdoor air temperature, heat exchanger deicer temperature and liquid pipe temperature during check operation. Detection Error Decision When the amount of refrigerant, which is calculated by using the outdoor air temperature, heat...
Page 133: High Pressure Switch System Abnormality
SiBE341027 Troubleshooting by Remote Controller 2.13 High Pressure Switch System Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error The protection device circuit checks continuity in the high pressure switch. Detection Error Decision When there is no continuity in the high pressure switch when the compressor stops operating. Conditions Supposed Defective high pressure switch...
Page 134: Abnormal Outdoor Fan Motor Signal
Troubleshooting by Remote Controller SiBE341027 2.14 Abnormal Outdoor Fan Motor Signal Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Detection of abnormal signal from fan motor. Detection Error Decision In case of detection of abnormal signal at starting fan motor. Conditions Supposed Abnormal fan motor signal (circuit error)
Page 135 SiBE341027 Troubleshooting by Remote Controller 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 error code “ ” in the monitor mode. When confirmation of error 3 shows as follows: →...
Page 136: Thermistor System Abnormality
Troubleshooting by Remote Controller SiBE341027 2.15 Thermistor System Abnormality H9, J3, J5, J6, J7, J8, J9 Remote Controller Display Applicable RQYQ-PY1B Models Method of Error The error is detected according to the temperature detected by each individual thermistor. Detection Error Decision When thermistor is disconnected or short-circuited during operation Conditions Supposed...
Page 137: High Pressure Sensor Abnormality
SiBE341027 Troubleshooting by Remote Controller 2.16 High Pressure Sensor Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Error is detected from the pressure measured with high pressure sensor. Detection Error Decision When the high pressure sensor is short circuit or open circuit. (Not less than 4.22MPa, or 0.01MPa or less) Conditions Supposed...
Page 138 Troubleshooting by Remote Controller SiBE341027 *2. Voltage measurement point Outdoor unit PCB (A1P) Connector for high pressure sensor (Red) Black Micro-computer White A/D input Measure DC voltage here. CHECK 12 Refer to P.191 Service Diagnosis...
Page 139: Current Sensor Abnormality
SiBE341027 Troubleshooting by Remote Controller 2.17 Current Sensor Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Error is detected from the current value detected by current sensor. Detection Error Decision When the current value detected by current sensor becomes 5A or less, or 40A or more during STD compressor operation.
Page 140: High Pressure Sensor Abnormality
Troubleshooting by Remote Controller SiBE341027 2.18 High Pressure Sensor Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Error is detected from the pressure detected by the high pressure sensor. Detection Error Decision When the high pressure sensor is short-circuit or open circuit. (Not less than 4.22MPa, or 0.01MPa or less) Conditions Supposed...
Page 141 SiBE341027 Troubleshooting by Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. 1. Mount the high pressure gauge. 2. Connect the checker for VRV. Are the characteristics of the high pressure sensor normal? Replace the high pressure sensor.
Page 142: Low Pressure Sensor Abnormality
Troubleshooting by Remote Controller SiBE341027 2.19 Low Pressure Sensor Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Error is detected from the pressure detected by the low pressure sensor. Detection Error Decision When the low pressure sensor is short circuit or open circuit. (Not less than 1.77MPa, or -0.01MPa and below) Conditions Supposed...
Page 143 SiBE341027 Troubleshooting by Remote Controller Note: *1. Voltage measurement point Outdoor unit PCB (A1P) Connector for low pressure sensor X31A Black White Micro-computer A/D input Make measurement of DC voltage between these wires. CHECK 12 Refer to P.191 Service Diagnosis...
Page 144: Inverter Pcb Abnormality
Troubleshooting by Remote Controller SiBE341027 2.20 Inverter PCB Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Detect error by current value during waveform output before compressor startup. Detect error by current sensor value during synchronized operation at the time of startup. Detection Error Decision When over-current is detected at the time of waveform output before operating the...
Page 145 SiBE341027 Troubleshooting by 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 once, and then check the compressor lead wires. Do the lead wires have any disconnection, broken Replace the lead wires.
Page 146: Inverter Radiation Fin Temperature Rise
Troubleshooting by Remote Controller SiBE341027 2.21 Inverter Radiation Fin Temperature Rise Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Radiation of compressor inverter PCB. Fin temperature is detected by the radiation fin thermistor. Detection Error Decision When the temperature of the inverter radiation fin increases above 87°C. Conditions Supposed Actuation of fin thermal (Actuates above 87°C)
Page 147: Momentary Overcurrent Of Inverter Compressor
SiBE341027 Troubleshooting by Remote Controller 2.22 Momentary Overcurrent of Inverter Compressor Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Error is detected from the current flowing in the power transistor. Detection Error Decision When an excessive current (59.1A) flows in the power transistor. (Instantaneous overcurrent also causes activation.) Conditions Supposed...
Page 148 Troubleshooting by Remote Controller SiBE341027 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. Are the compressor lead Replace the compressor wires normal? lead wires.
Page 149: Overcurrent Abnormal Of Inverter Compressor
SiBE341027 Troubleshooting by Remote Controller 2.23 Overcurrent Abnormal of Inverter Compressor Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Error is detected from the current flowing in the power transistor. Detection Error Decision When the inverter secondary current value is below. (1) 33.5A and over continues for 5 seconds.
Page 150 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Output current check Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Is the stop valve Open the stop valve. opened? Are the compressor Replace the compressor lead wires lead wires.
Page 151: Inverter Compressor Starting Abnormality
SiBE341027 Troubleshooting by Remote Controller 2.24 Inverter Compressor Starting Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Error is detected based on the signal waveform of the compressor. Detection Error Decision Starting the compressor does not complete. Conditions Supposed Stop valve is not opened Defective compressor...
Page 152 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Continued from the previous page. (Start failure due to aged operation.) Refrigerant is melting in refrigerant oil. (The unit is out of Cancel the melting state of power supply for more refrigerant. than 6 hours.) Is the insulation resistance of the Replace the inverter compressor.
Page 153: Transmission System Error (Between Inverter And Main Pcb)
SiBE341027 Troubleshooting by Remote Controller 2.25 Transmission System Error (between Inverter and Main PCB) Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Check the communication state between inverter PCB and main PCB by micro-computer. Detection Error Decision When the transmission is not carried out in a specified period of time or longer. Conditions Supposed Incorrect transmission wiring between the inverter PCB and outdoor unit main PCB...
Page 154 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Are the connectors of the main PCB, Properly connect the connectors. and inverter PCB all securely connected? (*1) Is the type of...
Page 155: Inverter Over-Ripple Protection
SiBE341027 Troubleshooting by Remote Controller 2.26 Inverter Over-Ripple Protection Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Imbalance in supply voltage is detected in PCB. Detection Error Decision When the amplitude of the ripple exceeding 6V is detected. Error is not decided while the unit operation is continued. Conditions “...
Page 156 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. Note: *1. Measure voltage at the X1M power supply terminal block.
Page 157: Inverter Radiation Fin Temperature Abnormality
SiBE341027 Troubleshooting by Remote Controller 2.27 Inverter Radiation Fin Temperature Abnormality Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Resistance of radiation fin thermistor is detected during the compressor stops. Detection Error Decision When the resistance value of thermistor becomes a value equivalent to open or short circuited status.
Page 158: Field Setting Abnormality After Replacing Main Pcb Or Combination Error Of Pcb
Troubleshooting by Remote Controller SiBE341027 2.28 Field Setting Abnormality after Replacing Main PCB or Combination Error of PCB Remote Controller Display Applicable RQYQ-PY1B Models Method of Error This error is detected according to communications with the INV. PCB. Detection Error Decision Make judgement according to communication data on whether or not the type of the INV.
Page 159: Refrigerant Shortage
SiBE341027 Troubleshooting by Remote Controller 2.29 Refrigerant Shortage Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Detect refrigerant shortage based on the temperature difference between low pressure or suction pipe and heat exchanger. Detection Error Decision [In cooling mode] Low pressure becomes 0.1MPa or less.
Page 160 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. In cooling Mount a pressure gauge at the service port on the low pressure side. Reset the operation using the remote controller then restart.
Page 161: Reverse Phase, Open Phase
SiBE341027 Troubleshooting by Remote Controller 2.30 Reverse Phase, Open Phase Remote Controller Display Applicable RQYQ-PY1B Models Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or reverse phase are judged. Detection Error Decision When a power supply is reverse phase, or T phase is open phase.
Page 162: Power Supply Insufficient Or Instantaneous Failure
Troubleshooting by Remote Controller SiBE341027 2.31 Power Supply Insufficient or Instantaneous Failure Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Detection of voltage of main circuit capacitor built in the inverter PCB and power supply voltage. Detection Error Decision When the voltage aforementioned is not less than 190V.
Page 163 SiBE341027 Troubleshooting by Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the condition of the power supply. Check if power supply voltage is 380 to 415V. Check if there is open phase or wrong wiring.
Page 164 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Turn ON the power supply, and start operation. Stop (standby) before Replace the noise filter PCB the fan rotates. (A3P). (Defect of noise filter) Stop (standby) when Replace the inverter PCB (A4P). the compressor If the inverter PCB is badly startup.
Page 165: Check Operation Is Not Executed
SiBE341027 Troubleshooting by Remote Controller 2.32 Check Operation is not Executed Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Check operation is executed or not Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed Check operation is not executed.
Page 166: Transmission Error (Between Indoor And Outdoor Units)
Troubleshooting by Remote Controller SiBE341027 2.33 Transmission Error (between Indoor and Outdoor Units) Remote Controller Display Applicable All indoor unit models Models RQYQ-PY1B Method of Error The error is generated when the micro-computer detects that the transmission between the indoor and outdoor unit is not normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
Page 167 SiBE341027 Troubleshooting by Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Check the detailed error status in the monitor mode. In Confirmation of Go on to the next page. error 4, LED lamp LED lamp display indicates as follows:...
Page 168 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Continued from the previous page In Confirmation of error 4, LED lamp indicates as follows: Start operation of all the indoor units.
Page 169: Transmission Error (Between Remote Controller And Indoor Unit)
SiBE341027 Troubleshooting by Remote Controller 2.34 Transmission Error (between Remote Controller and Indoor Unit) Remote Controller Display Applicable All indoor unit models Models Method of Error Micro-computer checks if transmission between indoor unit and remote controller is normal. Detection Error Decision Normal transmission does not continue for specified period.
Page 170: Transmission Error (Across Outdoor Units)
Troubleshooting by Remote Controller SiBE341027 2.35 Transmission Error (Across Outdoor Units) Remote Controller Display Applicable RQYQ-PY1B Models Method of Error Micro-computer checks if transmission between outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions Supposed Connection error in connecting wires between outdoor unit and external control adaptor for...
Page 171 SiBE341027 Troubleshooting by Remote Controller 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 “Confirmation of error 3” corresponding to the error code “ ”...
Page 172 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 1 Confirmation of error 3 Confirmation of error 4 Check if any disconnection or connection error is detected Correct the connecting wiring in connecting wires with...
Page 173 SiBE341027 Troubleshooting by Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 2 Confirmation of error 3 Confirmation of error 4 Cool/Heat selection C/H SELECT of the external is unified.
Page 174 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 3 Confirmation of error 3 Confirmation of error 4 Check the connection status of connecting wires of the outdoor multi Replace the outdoor unit main to SLAVE 1.
Page 175 SiBE341027 Troubleshooting by Remote Controller Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 6 Confirmation of error 3 Confirmation of error 4 Check the connection status of one of the connecting Replace the outdoor unit main wires of outdoor multi.
Page 176: Transmission Error (Between Main And Sub Remote Controllers)
Troubleshooting by Remote Controller SiBE341027 2.36 Transmission Error (between Main and Sub Remote Controllers) Remote Controller Display Applicable All indoor unit models Models Method of Error In case of controlling with 2-remote controller, check the system using micro-computer if signal transmission between indoor unit and remote controller (main and sub) is normal.
Page 177: Transmission Error (Between Indoor And Outdoor Units In The Same System)
SiBE341027 Troubleshooting by Remote Controller 2.37 Transmission Error (between Indoor and Outdoor Units in the Same System) Remote Controller Display Applicable All models of indoor unit RQYQ-PY1B Models Method of Error Detect error signal for the other indoor units within the circuit by outside unit PCB. Detection Error Decision When the error decision is made on any other indoor unit within the system concerned.
Page 178: Improper Combination Of Indoor And Outdoor Units, Indoor Units And Remote Controller
Troubleshooting by Remote Controller SiBE341027 2.38 Improper Combination of Indoor and Outdoor Units, Indoor Units and Remote Controller Remote Controller Display Applicable All indoor unit models RQYQ-PY1B Models Method of Error A difference occurs in data by the refrigerant type between indoor and outdoor units. The number of indoor units is out of the allowable range.
Page 179 SiBE341027 Troubleshooting by Remote Controller 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 “Confirmation of error 3” corresponding to the error code “ ”...
Page 180 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Diagnosis Flow 1 Confirmation of error 3 Confirmation of error 4 The number of indoor units connected to the Replace the outdoor unit main same refrigerant system...
Page 181 SiBE341027 Troubleshooting by 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 Confirmation of error 3 Confirmation of error 4 Multi-connection? Replace the outdoor unit main PCB.
Page 182: Address Duplication Of Centralized Controller
Troubleshooting by Remote Controller SiBE341027 2.39 Address Duplication of Centralized Controller Remote Controller Display Applicable All models of indoor unit Models Centralized controller Method of Error The principal indoor unit detects the same address as that of its own on any other indoor unit. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected.
Page 183: Transmission Error (Between Centralized Controller And Indoor Unit)
SiBE341027 Troubleshooting by Remote Controller 2.40 Transmission Error (between Centralized Controller and Indoor Unit) Remote Controller Display Applicable All models of indoor unit intelligent Touch Controller Centralized remote controller Models Schedule timer Method of Error Micro-computer checks if transmission between indoor unit and centralized controller is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
Page 184 Troubleshooting by Remote Controller SiBE341027 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. Continued to A Is the the (on the following transmission page)
Page 185 SiBE341027 Troubleshooting by Remote Controller Troubleshooting Check the transmission wiring between centralized controllers Abnormal for any broken wire. Correct the wiring. For details, refer to information in the “Procedure for checking broken wires” section. Normal Check the transmission wiring between master centralized Abnormal controller for any broken wire.
Page 186: System Is Not Set Yet
Troubleshooting by Remote Controller SiBE341027 2.41 System is not Set yet Remote Controller Display Applicable All models of indoor unit Models RQYQ-PY1B Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that of indoor units that have made changes in temperature.
Page 187: System Error, Refrigerant System Address Undefined
SiBE341027 Troubleshooting by Remote Controller 2.42 System Error, Refrigerant System Address Undefined Remote Controller Display Applicable All models of indoor unit Models RQYQ-PY1B Method of Error Detect an indoor unit with no auto address setting. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected. Conditions Supposed Improper connection of transmission wiring between indoor-outdoor units and outdoor-...
Page 188 Troubleshooting by Remote Controller SiBE341027 Troubleshooting Be sure to turn off power switch before connect or disconnect connector, Caution or parts damage may be occurred. Does a error occur Is electricity being even after 12 minutes introduce for the first elapses from the time time after installation Normal...
Page 189: Check
SiBE341027 Troubleshooting by Remote Controller 2.43 Check CHECK 1 Check for causes of rise in high pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. ← Stop valve closed Check to be sure the stop valve is open. Local High pipe ←...
Page 190 Troubleshooting by Remote Controller SiBE341027 CHECK 2 Check for causes of drop in low pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. [In cooling] ← Are the electrical characteristics normal? Defective low pressure sensor ∗...
Page 191 SiBE341027 Troubleshooting by Remote Controller CHECK 3 Check the Factors of Overheat Operation Identify the defective points referring to the defective factor analysis (FTA) as follows. Hot gas circuit clogging Defective hot Defective solenoid gas bypass ← Check if coil resistance and insulation valve coil control are normal.
Page 192 Troubleshooting by Remote Controller SiBE341027 CHECK 4 Power Transistor Check Perform the following procedures prior to check. (1) Power Off. (2) Remove all the wiring connected to the PCB 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 193 SiBE341027 Troubleshooting by Remote Controller CHECK 5 Check for causes of wet operation. Referring to the Fault Tree Analysis (FTA) shown below, identify defective points. Defective crankcase heater Refrigerant accumulation Frequent ON/OFF of compressor ←Refer to information in the Overcharge of refrigerant CHECK 6 section.
Page 194 Troubleshooting by Remote Controller SiBE341027 CHECK 6 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 judgement, refer to information provided below.
Page 195 SiBE341027 Troubleshooting by Remote Controller CHECK 7 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 judgement, refer to information provided below.
Page 196 Troubleshooting by Remote Controller SiBE341027 CHECK 8 Vacuuming and dehydration procedure Conduct vacuuming and dehydration in the piping system following the procedure for <Normal vacuuming and dehydration> described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for <Special vacuuming and dehydration>...
Page 197 SiBE341027 Troubleshooting by Remote Controller CHECK 9 List of inverter-related error codes Code Name Condition for determining error Major cause Instantaneous overcurrent of • Inverter output current exceeds 32.3A even • Liquid sealing inverter compressor instantaneously. • Defective compressor • Defective inverter PCB Overcurrent of inverter •...
Page 198 Troubleshooting by Remote Controller SiBE341027 CHECK 10 Concept of inverter-related error codes Transmission error When transmissions between the main PCB and the inverter PCB Main (Service monitor) PCB 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 199 SiBE341027 Troubleshooting by Remote Controller CHECK 11 Thermistor Resistance / Temperature Characteristics Indoor unit For air suction For liquid pipe For gas pipe Outdoor unit For outdoor air Radiation fin thermistor R1T For receiver liquid level For refrigerant regulator liquid pipe For subcooling heat exchanger outlet For liquid pipe For receiver gas vent outlet...
Page 200 Troubleshooting by Remote Controller SiBE341027 Outdoor Unit Thermistors for Discharge Pipe ∼ (R3T, R31 33T) k Ω k Ω k Ω k Ω k Ω k Ω T°C T°C T°C T°C T°C T°C 640.44 624.65 72.32 50.5 70.96 13.35 100.5 13.15 609.31 594.43...
Page 201 SiBE341027 Troubleshooting by Remote Controller CHECK 12 Pressure Sensor = 1.38V -0.69 : Output Voltage [High Side] V = 0.57V -0.28 : Output Voltage [Low Side] V : High pressure (MPa) Detected Pressure : Low pressure (MPa) High Pressure (P Low Pressure (P Output Voltage (V Service Diagnosis...
Page 202 Troubleshooting by Remote Controller SiBE341027 CHECK 13 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 centralized remote controller, and then conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the centralized remote controller using a multiple meter.
Page 203 SiBE341027 Troubleshooting by Remote Controller CHECK 14 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 centralized remote controller, do not dismount the master unit central setting connector (i.e., use the connector with the factory setting unchanged).
Page 204 Troubleshooting by Remote Controller SiBE341027 CHECK 15 Master-Slave Unit Setting Table Combination of intelligent Touch Controller and Centralized 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 205: Part 7 Appendix
SiBE341027 Part 7 Appendix 1. Piping Diagrams..................196 2. Wiring Diagrams..................199 3. Accessories..................202 3.1 Optional Accessories................202 Appendix...
Page 206: Piping Diagrams
Piping Diagrams SiBE341027 1. Piping Diagrams RQYQ8PY1B Appendix...
Page 207 SiBE341027 Piping Diagrams RQYQ10PY1B / RQYQ12PY1B Appendix...
Page 208 Piping Diagrams SiBE341027 RQYQ14PY1B / RQYQ16PY1B Appendix...
Page 209: Wiring Diagrams
SiBE341027 Wiring Diagrams 2. Wiring Diagrams RQYQ8PY1B Appendix...
Page 210 Wiring Diagrams SiBE341027 RQYQ10PY1B / RQYQ12PY1B Appendix...
Page 211 SiBE341027 Wiring Diagrams RQYQ14PY1B / RQYQ16PY1B Appendix...
Page 212: Accessories
Accessories SiBE341027 3. Accessories Optional Accessories S e r i e s V RV I I I RQYQ14PY1B RQYQ8PY1B RQYQ18PY1B M o d e l RQYQ10PY1B RQYQ16PY1B RQYQ20PY1B RQYQ12PY1B RQYQ22PY1B O p t i o n n a m e C o o l / H e a t s e l e c t o r KRC19–26A KJB111A...
Page 213 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion. Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorised parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

Daikin VRV II-Q RQYQ8-48PY1B Service Manual

Part 1 General Information

Part 2 Specifications

Part 3 Refrigerant Circuit

Part 4 Function

Part 5 Test Operation

Part 6 Service Diagnosis

Part 7 Appendix

Quick Links

Troubleshooting

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