Page 1 SiUS30-1301 Service Manual Water Cooled Heat Pump / Heat Recovery R-410A 60Hz RWEYQ72-252PTJU(9) RWEYQ72-252PYDN...
Page 2: Table Of Contents
SiUS30-1301 Water Cooled Inverter Series Water Cooled Inverter Series............. i 1. Safety Considerations ................vi 1.1 Safety Considerations for Repair ..............vi 1.2 Safety Considerations for Users..............vii Part 1 General Information .............. 1 1. Features ......................2 1.1 Design Flexibility ..................3 1.2 Easy Installation ...................
Page 3 SiUS30-1301 1.3 MAIN/SUB Setting when Using 2 Remote Controllers ....... 30 1.4 Centralized Control Group No. Setting............31 2. Wireless Remote Controller ..............33 2.1 Applicable Models ..................33 2.2 Names and Functions ................33 2.3 Address and MAIN/SUB Setting..............35 3.
Page 4 SiUS30-1301 9.4 Thermostat Control While in Normal Operation ......... 71 9.5 Thermostat Control in Dry Operation ............71 9.6 Thermostat Control with Operation Mode Set to "AUTO" ......72 9.7 Control of Electronic Expansion Valve ............73 9.8 Hot Start Control (In Heating Only) ............74 9.9 Heater Control (Optional PCB KRP1B ...
Page 5 SiUS30-1301 3.5 Indoor Unit Fan Motor Abnormality ............158 3.6 Indoor Unit Fan Motor Abnormality ............159 3.7 Overload / Overcurrent / Lock of Indoor Unit Fan Motor ......163 3.8 Swing Flap Motor (M1S) Abnormality............164 3.9 Power Supply Voltage Abnormality ............166 3.10 Electronic Expansion Valve Electronic Expansion Valve Coil Abnormality ..................
Page 6 SiUS30-1301 3.49 Improper Combination of Indoor, Branch Selector and Condensing Units..3.50 Address Duplication of Centralized Control Equipment ......234 3.51 Transmission Error between Centralized Control Equipment and Indoor Unit..................235 3.52 System is not Set yet................238 3.53 System Error, Refrigerant System Address Undefined ......239 3.54 Check .......................
Page 7: Safety Considerations
SiUS30-1301 Safety Considerations 1. Safety Considerations Read these SAFETY CONSIDERATIONS carefully before • Use only pipes, flare nuts, tools, and other materials performing any repair work. Comply with these safety designed specifically for R410A refrigerant systems. symbols without fail. Meanings of DANGER, WARNING, Never use tools or materials designed for R22 CAUTION, and NOTE Symbols: refrigerant systems on an R410A refrigerant system.
Page 8: Safety Considerations For Users
Safety Considerations SiUS30-1301 • When relocating the system, keep the refrigerant • Use an exclusive power circuit for the equipment. circuit free from substances other than the specified Insufficient circuit amperage capacity could result refrigerant (R-410A) such as air. Any presence of air in an electrical shock or fire.
Page 9: Part 1 General Information
SiUS30-1301 Part 1 General Information 1. Features ......................2 1.1 Design Flexibility ..................3 1.2 Easy Installation ................... 5 1.3 Energy Saving ....................6 1.4 Enhanced Usability..................7 1.5 Condensing Unit Lineup ................8 2. Model Names of Indoor/ Units ...........9 Condensing 2.1 Indoor Units ....................
Page 10: Features
Features SiUS30-1301 1. Features A water cooled intelligent individual air-conditioning system suitable for tall multistoried buildings. This unique system can perform as Heat Pump or Heat Recovery to any suitable application. Boiler (for heating) Cooling tower Water piping Cooling tower (Closed type), boiler VRV-W Refrigerant piping...
Page 11: Design Flexibility
This alone makes it an ideal system solution for building refurbishment projects. * Prior consultation is necessary about the heat source equipment. Contact your Daikin dealer for details. Water piping...
Page 12 Features SiUS30-1301 Cold climate capability Because the system is water cooled, the outdoor air temperature does not affect capacity. Furthermore, water cooling means no defrost operation is required, so rapid starting assures quick and comfortable heating in the coldest conditions. General air cooled air VRV-W Total heating...
Page 13: Easy Installation
SiUS30-1301 Features Easy Installation Compact and lightweight Adoption of a new water heat exchanger and optimization of the refrigerant control circuit has resulted in the Industry’s most compact and lightweight equipment. A weight of 330 lbs and height of 39-3/8 inch make installation possible in buildings with limited space, or where no space is available for condensing units.
Page 14: Energy Saving
Energy Saving Heat Recovery Daikin now offers 2-stage Heat Recovery operation. The first stage of Heat Recovery operation is within the refrigerant system. By controlling the Branch Selector unit that switches cooling and heating, simultaneous cooling and heating operation is made possible, with Heat Recovery performed between indoor units.
Page 15: Enhanced Usability
SiUS30-1301 Features Enhanced Usability A variety of functions that realize easy installation and improve reliability Easily responds to simultaneous heating and cooling needs. Branch Selector unit • Features a pump interlock function that By adding suction gas piping and a Branch controls the pump of the heat source Selector unit (sold separately), simultaneous simultaneously with the starting of the...
Page 16: Condensing Unit Lineup
Features SiUS30-1301 Condensing Unit Lineup A lineup of 6 ton to 21 ton models precisely meets wide-ranging office space requirements. The modular design imparts a simple and smart appearance and makes units easy to install. RWEYQ72PTJU Combination table for VRV-W Capacity Range Model Combination...
Page 17: Model Names Of Indoor /Condensing Units
SiUS30-1301 Model Names of Indoor / Condensing Units 2. Model Names of Indoor / Condensing Units Indoor Units Indoor Units Capacity Range 0.6 ton 0.8 ton 1 ton 1.5 ton 2 ton 2.5 ton 3 ton 3.5 ton 4 ton 4.5 ton 6 ton 8 ton Power Supply, Standard...
Page 18: External Appearance
External Appearance SiUS30-1301 3. External Appearance Indoor Units Ceiling mounted cassette (Round flow) type Wall mounted type FXFQ09PVJU FXAQ07PVJU FXFQ12PVJU FXAQ09PVJU FXFQ18PVJU FXAQ12PVJU FXFQ24PVJU FXAQ18PVJU FXFQ30PVJU FXAQ24PVJU FXFQ36PVJU FXFQ48PVJU 4-way ceiling mounted cassette (2’×2’) Floor standing type type FXLQ12MVJU FXZQ07M7VJU FXLQ18MVJU FXZQ09M7VJU FXLQ24MVJU...
Page 19: Condensing Units
SiUS30-1301 External Appearance Condensing Units RWEYQ72PTJU / RWEYQ84PTJU RWEYQ72PYDN / RWEYQ84PYDN 6, 7 ton RWEYQ144PTJU / RWEYQ168PTJU RWEYQ144PYDN / RWEYQ168PYDN 12, 14 ton RWEYQ216PTJU / RWEYQ252PTJU RWEYQ216PYDN / RWEYQ252PYDN 18, 21 ton General Information...
Page 20: Combination Of Condensing Units
Combination of Condensing Units SiUS30-1301 4. Combination of Condensing Units Module System Number of Condensing unit multi connection piping kit Capacity Units (option) 6 ton 7 ton  6 ton —  7 ton  12 ton Heat pump: BHFP22MA56U ...
Page 21: Part 2 Refrigerant Circuit
SiUS30-1301 Part 2 Refrigerant Circuit 1. Refrigerant Circuit (Piping Diagram) ............14 1.1 RWEYQ72PTJU / RWEYQ84PTJU RWEYQ72PYDN / RWEYQ84PYDN ............14 1.2 BSVQ36, 60, 96PVJU ................16 2. Functional Parts Layout ................17 2.1 RWEYQ72PTJU / RWEYQ84PTJU RWEYQ72PYDN / RWEYQ84PYDN ............17 3.
Page 22: Refrigerant Circuit (Piping Diagram)
Refrigerant Circuit (Piping Diagram) SiUS30-1301 1. Refrigerant Circuit (Piping Diagram) RWEYQ72PTJU / RWEYQ84PTJU RWEYQ72PYDN / RWEYQ84PYDN No. in Refrigerant Electric Name Major Function System Symbol Diagram Inverter compressor is operated on frequencies between 52 Hz and 230 Inverter compressor Hz by using the inverter. The number of operating steps is as follows. RWEYQ72P, 84P: 22 steps In cooling: High pressure control In heating or simultaneous cooling/heating operation:...
Page 23 SiUS30-1301 Refrigerant Circuit (Piping Diagram) RWEYQ72PTJU / RWEYQ84PTJU RWEYQ72PYDN / RWEYQ84PYDN Solenoid valve Fusible Filter Electronic plug expansion valve Heat exchanger pipe Filter Filter Filter Water inlet Plate heat Solenoid valve exchanger Check valve Electronic expansion valve Capillary Solenoid valve tube Check valve Water...
Page 24: Bsvq36, 60, 96Pvju
Refrigerant Circuit (Piping Diagram) SiUS30-1301 BSVQ36, 60, 96PVJU Electric Name Function Symbol Electronic expansion valve (EVH) Opens while in heating or all indoor units are in cooling. (Max : 760 pls) Electronic expansion valve (EVL) Opens while in cooling. (Max : 760 pls) Electronic expansion valve (EVHS) Opens while in heating or all indoor units are in cooling.
Page 25: Functional Parts Layout
SiUS30-1301 Functional Parts Layout 2. Functional Parts Layout RWEYQ72PTJU / RWEYQ84PTJU RWEYQ72PYDN / RWEYQ84PYDN 2.1.1 Functional Parts Layout (Solenoid Valve etc.) Electronic expansion valve (Subcooling) (Y3E) Solenoid valve (Y3S) Four way valve (20S1, Y5S) Solenoid valve (Y6S) Stop valve Four way valve (20S2, Y7S) (Liquid side) Solenoid valve (Y4S)
Page 26 Functional Parts Layout SiUS30-1301 2.1.2 Thermistors Top View Heat exchanger gas pipe thermistor (R4T) Discharge pipe thermistor (R3T) Front View Subcooling heat exchanger outlet pipe thermistor (R5T) Receiver outlet liquid pipe thermistor (R6T) Suction pipe thermistor (R2T) Refrigerant Circuit...
Page 27: Refrigerant Flow For Each Operation Mode
SiUS30-1301 Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode In Case of Heat Pump Connection A. Cooling Operation Indoor Unit ON (Cooling) + Thermo. ON Indoor Unit OFF (Cooling) Indoor Unit ON (Cooling) + Thermo. OFF High temp.
Page 28 Refrigerant Flow for Each Operation Mode SiUS30-1301 B. Heating Operation Indoor Unit ON (Heating) + Thermo. ON Indoor Unit OFF (Heating) Indoor Unit ON (Heating) + Thermo. OFF High temp. High pressure gas Heat exchanger Heat exchanger Heat exchanger High temp. High pressure liquid Low temp.
Page 29 SiUS30-1301 Refrigerant Flow for Each Operation Mode C. Oil Return Operation Indoor Unit ON (Cooling) + Thermo. ON Indoor Unit OFF (Cooling) Indoor Unit ON (Cooling) + Thermo. OFF High temp. High pressure gas Heat exchanger Heat exchanger Heat exchanger High temp.
Page 30: In Case Of Heat Recovery Connection (1 Condensing Unit Installation)
Refrigerant Flow for Each Operation Mode SiUS30-1301 In Case of Heat Recovery Connection (1 Condensing Unit Installation) A. Cooling Operation Indoor Unit ON (Cooling) + Thermo. ON Indoor Unit ON (Cooling) + Thermo. OFF Indoor Unit OFF (Cooling) High temp. High pressure gas Heat exchanger Heat exchanger Heat exchanger...
Page 31 SiUS30-1301 Refrigerant Flow for Each Operation Mode B. Heating Operation Indoor Unit ON (Heating) + Thermo. ON Indoor Unit ON (Heating) + Thermo. OFF Indoor Unit OFF (Heating) High temp. High pressure gas Heat exchanger Heat exchanger Heat exchanger High temp. High pressure liquid Low temp.
Page 32 Refrigerant Flow for Each Operation Mode SiUS30-1301 C. Heating and Simultaneous Cooling/Heating Operation (When the condensing water-cooled heat exchanger is used as condensing.) Indoor Unit ON (Cooling) + Thermo. ON Indoor Unit ON (Cooling) + Thermo. ON Indoor Unit ON (Heating) + Thermo. ON High temp.
Page 33 SiUS30-1301 Refrigerant Flow for Each Operation Mode D. Heating and Simultaneous Cooling/Heating Operation (When the condensing unit water cooled heat exchanger is used as evaporator.) (In case there are indoor units operating with cooling thermostat “ON”.) Indoor Unit ON (Cooling) + Thermo. ON Indoor Unit ON (Heating) + Thermo.
Page 34 Refrigerant Flow for Each Operation Mode SiUS30-1301 E. Oil Return Operation at Simultaneous Cooling/Heating Operation Indoor Unit ON (Cooling) + Thermo. ON Indoor Unit ON (Heating) + Thermo. ON Indoor Unit ON (Heating) + Thermo. OFF High temp. High pressure gas Heat exchanger Heat exchanger Heat exchanger...
Page 35: Part 3 Remote Controller
SiUS30-1301 Part 3 Remote Controller 1. Wired Remote Controller................28 1.1 Applicable Models ..................28 1.2 Names and Functions ................28 1.3 MAIN/SUB Setting when Using 2 Remote Controllers ....... 30 1.4 Centralized Control Group No. Setting............31 2. Wireless Remote Controller ..............33 2.1 Applicable Models ..................
Page 36: Wired Remote Controller
Wired Remote Controller SiUS30-1301 1. Wired Remote Controller Applicable Models FXLQ-M Model FXFQ-P FXZQ-M FXDQ-M FXMQ-P FXMQ-M FXHQ-M FXAQ-P FXTQ-PA FXNQ-M Navigation Remote BRC1E71/72 Controller Names and Functions 1.2.1 BRC1E71 /72 1. Operation mode selector button 11. LCD (with backlight) 4.
Page 37 SiUS30-1301 Wired Remote Controller 4. Up button  Used to raise the setpoint.  The item above the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.)  Used to change the selected item. 5.
Page 38: Main/Sub Setting When Using 2 Remote Controllers
Wired Remote Controller SiUS30-1301 MAIN/SUB Setting when Using 2 Remote Controllers Situation The MAIN/SUB setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to MAIN and the other to SUB.
Page 39: Centralized Control Group No. Setting
SiUS30-1301 Wired Remote Controller Centralized Control Group No. Setting 1.4.1 BRC1E71/72 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller.
Page 40 Wired Remote Controller SiUS30-1301 <Group Address (Group)> Basic screen is displayed. Press Press and hold Cancel Cancel button button for 4 seconds once. or more. Select "Group Address" and then press Menu/OK button. Service Item 2 is settings menu displayed. Press Cancel is displayed.
Page 41: Wireless Remote Controller
SiUS30-1301 Wireless Remote Controller 2. Wireless Remote Controller Applicable Models FXLQ-M Model FXFQ-P FXZQ-M FXDQ-M FXMQ-P FXMQ-M FXHQ-M FXAQ-P FXTQ-PA FXNQ-M Wireless Remote BRC7C812 – BRC4C82 BRC7E83 BRC7E818 – Controller Names and Functions 3P107422-11J Remote Controller...
Page 42 Wireless Remote Controller SiUS30-1301 AIRFLOW DIRECTION ADJUST BUTTON DISPLAY “ ” (SIGNAL OPERATION MODE SELECTOR BUTTON TRANSMISSION) Press this button to select OPERATION This lights up when a signal is being MODE. transmitted. FILTER SIGN RESET BUTTON DISPLAY “ ” “ ”...
Page 43: Address And Main/Sub Setting
SiUS30-1301 Wireless Remote Controller Address and MAIN/SUB Setting Introduction To set the wireless remote controller, you have to set the address for:  The receiver of the wireless remote controller  The wireless remote controller. Setting the Address for the Receiver The address for the receiver of the wireless remote controller is factory setting to 1.
Page 44: Service Mode
Service Mode SiUS30-1301 3. Service Mode BRC1E71/72 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press Cancel Press button. Cancel Press and hold Cancel button button for 4 seconds or more. once.
Page 45 SiUS30-1301 Service Mode Maintenance Menu Item 2 Remarks 2.3. Indoor Unit Status 1. Unit No. Select the Unit No. you want to check. 2. FAN Fan tap 3. FLAP Swing, fixed 4. Speed Fan speed (rpm) 5. EV Degree that electronic expansion valve is open (pls) 6.
Page 46: Part 4 Function And Control
SiUS30-1301 Part 4 Function and Control 1. Function General..................40 1.1 Symbol ....................... 40 1.2 Operation Mode..................41 1.3 Normal Operation ..................42 1.4 Branch Selector Unit & Indoor Unit Operation Mode Detail ....... 43 2. Stop......................44 2.1 Stopping Operation ..................44 3.
Page 47 SiUS30-1301 9.8 Hot Start Control (In Heating Only) ............74 9.9 Heater Control (Optional PCB KRP1B ... is required.) ....... 75 9.10 Heater Control (FXTQ) ................76 9.11 4 Step Thermostat Processing (FXTQ) ............78 9.12 Interlocked with External Equipment (FXTQ) ..........79 9.13 List of Swing Flap Operations ..............
Page 48: Function General
Function General SiUS30-1301 1. Function General Symbol Symbol Electric symbol Description or function 20S1 Four-way valve (Main) 20S2 Four-way valve (Sub) — Discharge pipe superheat DSHi — Discharge pipe superheat of INV. compressor (Y1E, Y3E) Opening of electronic expansion valve Electronic expansion valve for water heat exchanger Electronic expansion valve for subcooling heat exchanger Value of INV.
Page 49: Operation Mode
SiUS30-1301 Function General Operation Mode System stopping function • Restart standby Thermostat ON • Crankcase heater control Startup control • Cooling startup control • Heating startup control • Pump down residual operation • Pressure equalization startup control • Condensing unit rotation Normal operation Thermostat OFF •...
Page 50: Normal Operation
Function General SiUS30-1301 Normal Operation Actuator Function Electric Parts Name Symbol Normal heating or normal cooling/ Symbol Normal cooling heating simultaneous operation PI control, High pressure PI control, High pressure protection, Low pressure protection, Low pressure Inverter compressor — protection, Discharge pipe protection, Discharge pipe temperature protection control, temperature protection control,...
Page 51: Branch Selector Unit & Indoor Unit Operation Mode Detail
SiUS30-1301 Function General Branch Selector Unit & Indoor Unit Operation Mode Detail  1: The switch for the Branch Selector unit is operated when pressure equalization control turns ON after cooling/heating mode of other indoor unit is changed or on the timing of oil returns. ...
Page 52: Stop
Stop SiUS30-1301 2. Stop Stopping Operation This operation defines the operation of the actuator while the system stops. 2.1.1 When System is in Stop Mode Parts Name Symbol Electric Symbol Actuator Function Inverter compressor — Inverter cooling fan — M1F, M2F Four-way valve (Main) 20S1 Holding...
Page 53 SiUS30-1301 Stop  Heating or simultaneously cooling/heating operation The system operates in mode A or mode B listed in the table below. Electric Parts Name Symbol Mode A Operation (1) Mode B Operation (1) Symbol Inverter compressor — Inverter cooling fan —...
Page 54: Standby
Standby SiUS30-1301 3. Standby Restart Standby Forced standby is performed to prevent frequent repetition of ON/OFF of the compressor, and to equalize pressure in the refrigerant system. Electric Parts Name Symbol Actuator Function Symbol Inverter compressor — 0 Hz Inverter cooling fan —...
Page 55: Startup Control
SiUS30-1301 Startup Control 4. Startup Control This startup control provides the following control to reduce the compressor load resulting from liquid return or else during compressor startup, and also determine the position of four way valves. Startup Control in Cooling Both master and slave units operate same time for changing four way valve position ...
Page 56: Startup Control In Heating
Startup Control SiUS30-1301 Startup Control in Heating Both master and slave units operate same time for changing four way valve position  Normal operation after completion. Pc: Value detected by high pressure sensor Pe: Value detected by low pressure sensor Thermostat ON Electric Pressure Equalization...
Page 57: Pressure Equalizing Control
SiUS30-1301 Startup Control Pressure Equalizing Control This pressure equalizing control is used to equalize the pressure of discharge piping and suction piping in order to reduce refrigerant passing noise when changing over the Branch Selector units. [Starting conditions] The temperature control of indoor units with thermostat ON does not match up with the state of the Branch Selector unit changeover valve to which the indoor units are connected.
Page 58: Normal Control
Normal Control SiUS30-1301 5. Normal Control Compressor Control 5.1.1 Compressor 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 Low pressure equivalent saturation temperature...
Page 59 SiUS30-1301 Normal Control 5.1.2 Compressor Operation Frequency Steps 1. One condensing 2. Two condensing units connection installation unit installation A: One Compressor operation Step Master Step 52Hz No. Master Startup 57Hz 52Hz 62Hz 57Hz 68Hz 62Hz 74Hz 68Hz 81Hz 74Hz 88Hz 81Hz B: Two Compressors operation...
Page 60: Electronic Expansion Valve Control
Normal Control SiUS30-1301 Electronic Expansion Valve Control Main Electronic Expansion Valve EV1 Control Carries out the electronic expansion valve (Y1E) PI control to maintain the evaporator outlet superheated degree (SH) at constant during heating operation to make maximum use of the condensing unit heat exchanger (evaporator).
Page 61: Heat Exchange Mode In Heating Operation Or Simultaneous Cooling / Heating Operation
SiUS30-1301 Normal Control Heat Exchange Mode in Heating Operation or Simultaneous Cooling / Heating Operation In heating or simultaneous cooling / heating operation, a target condensing and evaporating temperature can be secured by switching the water heat exchanger of the condensing unit into evaporator or condensing with load.
Page 62 Normal Control SiUS30-1301 Three condensing units installation Note 1: DGR = Target of heat exchange Master unit Slave unit 1 Slave unit 2 capacity balance – Actual Four-way valve for heat measurement of heat exchanger [Y7S] (For the (Condenser) (Condenser) (Condenser) application of heat exchanger) balance...
Page 63: Protection Control
SiUS30-1301 Protection Control 6. 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 64: Low Pressure Protection Control
Protection Control SiUS30-1301 Low Pressure Protection Control This low pressure protection control protects compressors against the transient decrease of low pressure. [In cooling] Pe: Value detected by low pressure sensor for master unit Normal operation Pe > 56.5 psi Pe < 49.3 psi Compressor 52 Hz Pe <...
Page 65: Discharge Pipe Protection Control
SiUS30-1301 Protection Control (When the condensing unit heat exchanger is used as condensing.) Pe: Value detected by low pressure sensor for each condensing unit Normal operation Compressor upper limit Pe < 63.8 psi frequency = 216 Hz Pe > 71.0 psi Compressor upper limit up Compressor upper limit down 1 step/20 seconds...
Page 66: Inverter Protection Control
Protection Control SiUS30-1301 Inverter Protection Control Inverter current protection control and radiation fin temperature control are performed to prevent tripping due to an error, or transient inverter overcurrent, and radiation fin temperature increase. This control is carried out in each condensing unit. [Inverter overcurrent protection control] A: 230V unit: 26.5A Not limited...
Page 67: Cooling Fan Control
SiUS30-1301 Protection Control Cooling Fan Control This function is used for ON/OFF control of the cooling fan to cool the inverter. This cooling fan operates only when the temperature of the inverter fan is high, in order to reduce the operating time of the fan.
Page 68: Special Operation
Special Operation SiUS30-1301 7. Special Operation Oil Return Operation In order to prevent the running-out of refrigerating oil in the compressor, the oil return operation is conducted to recover oil flown out from the compressor to the system side. 7.1.1 Oil Return Operation in Cooling Tc: High pressure equivalent saturation temperature Te: Low pressure equivalent saturation temperature [Starting conditions]...
Page 69 SiUS30-1301 Special Operation 7.1.2 Oil Return Operation in Heating or Cooling/Heating Simultaneous Operation Tc: High pressure equivalent saturation temperature Te: Low pressure equivalent saturation temperature [Starting conditions] Start oil return operation in heating referring to the following conditions. Cumulative compressor operating time after power supply turns ON exceeds 2 hours and the time after the completion of previous oil return operation exceeds 8 hours.
Page 70: Oil Return Operation Of Water Heat Exchanger
Special Operation SiUS30-1301 Oil Return Operation of Water Heat Exchanger [Oil return operation of water heat exchanger] When the water heat exchanger is used as evaporator during heating or simultaneous cooling/ heating operation, the operation that the oil accumulated in the water heat exchanger is returned to compressor is conducted.
Page 71 SiUS30-1301 Special Operation 7.3.1 Cooling Operation Mode Electric Parts Name Symbol Master Unit Operation Slave Unit Operation Symbol Inverter compressor — Current step Inverter cooling fan — M1F, M2F Inverter cooling fan control Inverter cooling fan control Four-way valve (Main) 20S1 Four-way valve (Sub) 20S2...
Page 72: Refrigerant Drift Prevention
Special Operation SiUS30-1301 Refrigerant Drift Prevention “Refrigerant drift prevention control” is carried out, in order to prevent refrigerant drift among condensing units during heating operation using condensing multiple connection. Refrigerant overcharged in condensing units are collected and transferred to other condensing units that are refrigerant shortage by controlling the electronic expansion valve.
Page 73: Other Control
SiUS30-1301 Other Control 8. Other Control Condensing Unit Rotation In the case of multi condensing unit system, this condensing unit rotation prevents the compressor from burning out due to unbalanced oil level between condensing units. [Details of condensing unit rotation] In the case of multi-condensing unit system, each condensing unit is given an operating priority for the control.
Page 74: Outline Of Control (Indoor Unit)
Outline of Control (Indoor Unit) SiUS30-1301 9. Outline of Control (Indoor Unit) Drain Pump Control The drain pump is controlled by the ON/OFF buttons. 9.1.1 When the Float Switch is Tripped while the Cooling Thermostat is ON: Remote controller " "...
Page 75 SiUS30-1301 Outline of Control (Indoor Unit) 9.1.3 When the Float Switch is Tripped During Heating Operation: Remote controller " " blinking abnormal stop Thermostat (running) Humidifier Reset Float switch Drain pump 5 min. 5 sec. 5 min. Note: During heating operation, if the float switch is not reset even after the 5 minutes operation, 5 seconds stop, 5 minutes operation cycle ends, operation continues until the switch is reset.
Page 76: Louver Control For Preventing Ceiling Dirt
Outline of Control (Indoor Unit) SiUS30-1301 Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.
Page 77: Room Temperature Thermistor In Remote Controller
SiUS30-1301 Outline of Control (Indoor Unit) Room Temperature Thermistor in Remote Controller Temperature is controlled by both the room temperature thermistor in remote controller and suction air thermistor () in the indoor unit. (This is however limited to when the field setting for the room temperature thermistor in remote controller is set to “Use.”) Note: When outdoor air is introduced to the air-conditioner with mixed into indoor air, the room...
Page 78 Outline of Control (Indoor Unit) SiUS30-1301 Heating When controlling the indoor unit by the suction air thermistor of the indoor unit alone, the indoor unit may be placed in thermos-off due to the room temperature being measured at the indoor unit’s suction air thermistor before the lower part of the room reaches the set temperature.
Page 79: Thermostat Control While In Normal Operation
SiUS30-1301 Outline of Control (Indoor Unit) 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 setting 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 80: Thermostat Control With Operation Mode Set To "Auto
Outline of Control (Indoor Unit) SiUS30-1301 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 Setting from Remote Controller (P.89 and later)"...
Page 81: Control Of Electronic Expansion Valve
SiUS30-1301 Outline of Control (Indoor Unit) Control of Electronic Expansion Valve Electronic expansion valves in indoor units have the functions of conducting superheated degree control in cooling operation and subcooling degree control in heating operation. However, if the indoor units receive any control command such as a protection control command or a special control command from the condensing unit, the units will give a priority to the control command.
Page 82: Hot Start Control (In Heating Only)
Outline of Control (Indoor Unit) SiUS30-1301 Hot Start Control (In Heating 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 starting condition 1 or the starting condition 2 is established, the operations shown below will be conducted.
Page 83: Heater Control (Optional Pcb Krp1B
SiUS30-1301 Outline of Control (Indoor Unit) Heater Control (Optional PCB KRP1B ... is required.) The heater control is conducted in the following manner. [Normal control] While in heating, the heater control (ON/ Set temperature OFF) is conducted as shown on the right. 3.6ºF 3.6ºF [Overload control]...
Page 84: Heater Control (Fxtq)
Outline of Control (Indoor Unit) SiUS30-1301 9.10 Heater Control (FXTQ) 9.10.1 Auxiliary Heater Control If heating is insufficient in heat pump system alone, an electrical heater is to be used as the auxiliary heater. The following shows the ON/OFF conditions for the electric heater. Fan H tap Thermostat OFF/Stop operation 120 seconds ∗2...
Page 85 SiUS30-1301 Outline of Control (Indoor Unit) 9.10.2 Heat Pump Lockout Mode During heating operation, users can select an electrical heater for heating. For this, signals are sent using ABC terminal of condensing unit PCB. When the hot-water heating signal is received from the condensing unit PCB, heating operation is performed only with the heater as manual backup operation.
Page 86: Step Thermostat Processing (Fxtq)
Outline of Control (Indoor Unit) SiUS30-1301 Condition A • Heating mode • Thermostat step 1 = "ON" • Not during fan residual operation & • [Electrical heater setting] = "01" • [Electrical heater setting] = "03" & • Hot-water heater = "1" (ON) Condition B •...
Page 87: Interlocked With External Equipment (Fxtq)
SiUS30-1301 Outline of Control (Indoor Unit) 9.12 Interlocked with External Equipment (FXTQ) 9.12.1 Humidifier When a humidifier is connected onsite, the fan operates with the airflow rate set of the remote controller or with the H tap. • Remote control operation = ON &...
Page 88 Outline of Control (Indoor Unit) SiUS30-1301 9.12.2 Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer.
Page 89: List Of Swing Flap Operations
SiUS30-1301 Outline of Control (Indoor Unit) 9.13 List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXFQ FXHQ FXAQ Swing Horizontal Horizontal Horizontal Hot start from defrosting operation Airflow direction set Horizontal Horizontal Horizontal Swing Horizontal Horizontal Horizontal...
Page 90: Freeze-Up Prevention
Outline of Control (Indoor Unit) SiUS30-1301 9.14 Freeze-up Prevention Freeze-up When the temperature detected by liquid pipe thermistor (R2T) of the indoor unit heat exchanger Prevention by Off drops too low, the unit enters freeze-up prevention operation in accordance with the following conditions, and is also set in accordance with the conditions given below.
Page 91: Part 5 Field Setting
SiUS30-1301 Part 5 Field Setting 1. Test Operation ..................84 1.1 Procedure and Outline ................84 2. Field Setting from Remote Controller............89 2.1 Wired Remote Controller................89 2.2 Wireless Remote Controller ............... 90 2.3 Simplified Remote Controller..............91 2.4 Setting Contents and Code No. for Indoor Units ........92 3.
Page 92: Test Operation
Test Operation SiUS30-1301 1. Test Operation Procedure and Outline Follow the following procedure to conduct the initial test operation after installation. 1.1.1 Check Work Prior to Turn Power Supply ON Check the below items. Is the wiring performed as specified? •...
Page 93 SiUS30-1301 Test Operation 1.1.2 Turn Power ON Turn condensing unit, indoor Be sure to turn the power ON 6 hours before starting operation to unit, Branch Selector unit and protect compressors. (to power ON crankcase heater) heat source water pump power Make sure the display is normal.
Page 94 Test Operation SiUS30-1301 3. When an Indoor Unit or Condensing Unit has been Added, or Indoor or condensing Unit PCB has been Changed Be sure to press and hold the RESET button for 5 seconds. If not, the addition cannot be recognized. In this case, the unit cannot be run for up to 12 minutes to automatically set the address (indoor-condensing unit address, etc.) Status Condensing...
Page 95 SiUS30-1301 Test Operation condensing units, H2P will turn ON and the compressor will not operate. Referring to information in table in “1.1.2 Turn Power ON (on P.85)”, check to be sure the LED displays are normal and then operate the compressor. ·...
Page 96 Test Operation SiUS30-1301 Error code In case of an alarm code displayed on remote controller: Error code Installation error Remedial action Open the stop valve. The stop valve of an condensing unit is not Check referring to the table in opened.
Page 97: Field Setting From Remote Controller
SiUS30-1301 Field Setting from Remote Controller 2. 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 field setting in accordance with the following description. Wrong setting may cause error.
Page 98: Wireless Remote Controller
Field Setting from Remote Controller SiUS30-1301 Press Menu/OK button. Setting confirmation screen is displayed. <Setting confirmation screen> Select and press Menu/OK button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repeat “ ”...
Page 99: Simplified Remote Controller
SiUS30-1301 Field Setting from Remote Controller Simplified Remote Controller MODE NO. FIRST CODE NO. UNIT NO. SECOND CODE NO. 1. Remove the upper part of remote controller. 2. When in the normal mode, press the [BS6] BUTTON (O) (field setting), and the FIELD SETTING MODE is entered. ...
Page 100: Setting Contents And Code No. For Indoor Units
Field Setting from Remote Controller SiUS30-1301 Setting Contents and Code No. for Indoor Units : Factory setting Mode Second Code No. First Setting Contents Code (2) Approx. Approx. Ultra long life 10,000 5,000 Filter contamination heavy/ filter hrs. hrs. light (Setting for display time to clean air filter) Approx.
Page 101 SiUS30-1301 Field Setting from Remote Controller Note: 1. Settings are made simultaneously for the entire group, however, if you select the mode No. inside parentheses, you can also set by each individual unit. Setting changes however cannot be checked except in the individual mode for those in parentheses.
Page 102 Field Setting from Remote Controller SiUS30-1301 2.4.2 Detailed Explanation of Setting Modes Filter Sign Setting If switching the filter sign ON time, set as given in the table below. First Code Second Standard Long Life Ultra Long Life Mode No. Setting Code No.
Page 103 SiUS30-1301 Field Setting from Remote Controller "Filter Cleaning" Displayed or Not Displayed Whether or not to display "Filter Cleaning" after operation of certain duration can be selected. Mode No. First Code No. Second Code No. "Filter Cleaning" display Display 10 (20) No display 4 Step Thermostat Processing (for FXTQ model) Auxiliary electric heater ON/OFF temperature setting...
Page 104 Field Setting from Remote Controller SiUS30-1301 External ON/OFF Input This input is used for "ON/OFF operation" and "Protection device input" from the condensing. The input is performed from the T1-T2 terminal of the operation terminal block in the electrical components box . F2 T1 T2 Forced stop Input A...
Page 105 SiUS30-1301 Field Setting from Remote Controller Auto Restart after Power Failure Reset For the air conditioners with no setting for the function (same as factory setting), the units will be left in the stop condition when the power supply is reset automatically after power failure reset or the main power supply is turned ON again after once turned OFF.
Page 106 Field Setting from Remote Controller SiUS30-1301  In the Case of FXFQ36 Ceiling height First code Second Mode No. Setting code No. 4-way Outlets 3-way Outlets 2-way Outlets Lower than Lower than Lower than Standard (N) 10-1/2 ft 11-12/18 ft 13-25/32 ft Lower than Lower than...
Page 107 SiUS30-1301 Field Setting from Remote Controller Humidification when Heating Thermostat is OFF Setting to "Humidification Setting" turns ON the humidifier if suction air temperature is 68°F or above and turns OFF the humidifier if suction air temperature is 64°F or below when the heating thermostat is OFF. Mode No.
Page 108 Field Setting from Remote Controller SiUS30-1301 2.4.3 Centralized Control Group No. Setting BRC1E Type In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No.
Page 109 SiUS30-1301 Field Setting from Remote Controller BRC7C Type / BRC7E Type / BRC4C Type  Group No. setting by wireless remote controller for centralized control 1. When in the normal mode, press “ ” button for 4 seconds or more, and operation then enters the “field setting mode.”...
Page 110 Field Setting from Remote Controller SiUS30-1301 2.4.4 Setting of Operation Control Mode from Remote Controller (Field 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 111 SiUS30-1301 Field Setting from Remote Controller Selection of Control Mode No. Select whether to accept or to reject the operation from the remote controller regarding the operation, stop, temperature setting and operation mode setting, respectively, and determine the particular control mode from the rightmost column of the table below. (Example) Operation by remote Operation by remote...
Page 112: Field Setting From Condensing Unit
Field Setting from Condensing Unit SiUS30-1301 3. Field Setting from Condensing Unit Location of DIP Switch and Branch Selector Button Condensing unit PCB (1) Micro-computer normal monitor (2) Set mode display (LED) (3) Branch H1P H2P H3P H4P H5P H6P H7P Selector button MODE RETURN...
Page 113: Setting By Dip Switches
SiUS30-1301 Field Setting from Condensing Unit Setting by DIP Switches The following field settings are made by DIP switches on PCB. Dip Switch Setting Item Description Setting Cool/Heat select Used to set cool/heat select by remote controller DS1-1 equipped with condensing unit. (Factory setting) DS1-2 Not used...
Page 114: Setting By Branch Selector Buttons
Field Setting from Condensing Unit SiUS30-1301 Setting by Branch Selector Buttons The following settings are made by Branch Selector buttons on PCB. In case of multi condensing unit system, various items should be set with the master unit. (Setting with the slave unit is disabled.) The master unit and slave unit can be discriminated with the LED indication as shown below.
Page 115: Setting Mode 1
SiUS30-1301 Field Setting from Condensing Unit Setting Mode 1 Normally, “Setting mode 1” is set. In case of other status, press MODE button (BS1) once and set to “setting mode 1”. Table 1 : ON : OFF : BLINK <Selection of setting items> LED Display Example Press the SET button (BS2) and set Setting (displaying) Item...
Page 116: Setting Mode 2
Field Setting from Condensing Unit SiUS30-1301 Setting Mode 2 Press and hold the MODE button Setting Item Description (BS1) for 5 seconds and set to Cool/heat unified “setting mode 2”. Sets address for cool/heat unified operation. address demand address Sets address for demand operation Number of units for Sets the number of units for sequential starting.
Page 117 SiUS30-1301 Field Setting from Condensing Unit : ON : OFF : BLINK Setting Item Setting Condition C/H Selection Low Night LED Display MODE TEST Noise Demand Setting Item Contents  Master Slave Operation Factory setting khhhhhh  Address khhhhhk Binary number Cool / Heat Unified address (6 digits)
Page 118 Field Setting from Condensing Unit SiUS30-1301 : ON : OFF : BLINK Setting Item Setting Condition C/H Selection Low Night LED Display MODE TEST Noise Demand Setting Item Contents  Master Slave Operation Factory setting khhhhhk  Emergency operation (Master unit with multi- condensing khhhhkh Master unit operation:...
Page 119: Monitor Mode
SiUS30-1301 Field Setting from Condensing Unit Monitor Mode : ON : OFF : BLINK To enter the monitor mode, press LED Display Setting Item Data Display the MODE button (BS1) when in “Setting mode 1”. l h h h h h h Various setting (2) l h h h h h k...
Page 120: Detailed Explanation Of Setting Modes
Field Setting from Condensing Unit SiUS30-1301 3. Data such as addresses and number of units is expressed as binary numbers. The No. 1 cool/heat unified address is expressed as a binary number consisting of the lower 6 digits. (0 - 63) (Example 1) In (Example 1) the address is 010110 (binary number), which translates to 16 + 4 + 2 = 22 (base 10 number).
Page 121 SiUS30-1301 Field Setting from Condensing Unit (2) Set Cool/Heat Separately for Each Condensing Unit System by Cool / Heat Selector  It does not matter whether or not there is condensing - condensing unit wiring.  Set condensing unit PCB DS1-1 to OUT (factory setting). ...
Page 122 Field Setting from Condensing Unit SiUS30-1301 (3) Set Cool / Heat for more than Single Condensing Unit System Simultaneously in Accordance with Unified Master Condensing Unit by Indoor Unit Remote Controller  Install the external control adaptor for condensing unit on either the condensing-condensing, indoor-condensing transmission line.
Page 123 SiUS30-1301 Field Setting from Condensing Unit (4) Set Cool/Heat for more than Single condensing Unit System Simultaneously in Accordance with Unified Master condensing Unit by Cool / Heat Selector  Install the external control adaptor for condensing unit on either the condensing-condensing, indoor-condensing transmission line. ...
Page 124 Field Setting from Condensing Unit SiUS30-1301 Supplementation on (3) and (4). When switching cool/heat for each adaptor PCB with the use of more than 1 adaptor PCB, set the address of the external control adaptor for condensing unit PCB DS1 and DS2 so that it matches the unified cool/heat address of condensing unit main PCB.
Page 125 SiUS30-1301 Field Setting from Condensing Unit (5) Set cool/heat at all condensing unit systems simultaneously for each condensing unit external control adaptor by using the central remote controller.  Install the condensing unit external control adaptor (optional accessory) onto the condensing-condensing, indoor-condensing, or indoor-indoor transmission line. ...
Page 126 Field Setting from Condensing Unit SiUS30-1301 Setting of Address In binary, set the address number (middle 2 digits) and terminal No. (last 3 digits) of the external control adaptor (DIP switches) and condensing unit main PCB (LED lamps). External control adaptor for condensing Condensing unit main PCB LED Address Terminal...
Page 127 SiUS30-1301 Field Setting from Condensing Unit 3.7.2 Cool/Heat Mode Switching (Heating and Simultaneous Cooling/Heating Operation Connection) Set Cool/Heat Separately for Each Branch Selector Unit by Cool/Heat Selector. (1) Before turning ON the power of the Branch Selector unit, set the DIP switch (DS1-1) on the Branch Selector unit PCB as following.
Page 128 Field Setting from Condensing Unit SiUS30-1301 3.7.3 Setting of Demand Operation Setting of Demand Operation By connecting the external contact input to the demand input of the external control adaptor for condensing unit (optional), the power consumption of unit operation can be saved suppressing the compressor operating condition. Setting content Setting method External control...
Page 129 SiUS30-1301 Field Setting from Condensing Unit Image of operation in the case of A Power consumption The power Rated power consumption consumption during the demand level 1 80 % of rated power consumption Demand level 1 instructing Demand level 2 instructing Demand level 3 instructing instructing can be 70 % of rated power consumption set with the...
Page 130 Field Setting from Condensing Unit SiUS30-1301 Detailed Setting Procedure and Demand Control 1. Setting mode 1 (H1P OFF) (1) In setting mode 2, press the BS1 (MODE button) once.  Setting mode 1 is entered and H1P lights OFF. During the setting mode 1 is displayed, “In demand control” is displayed. 2.
Page 131 SiUS30-1301 Field Setting from Condensing Unit 3.7.4 Setting of Refrigerant Additional Charging Operation When additional refrigerant is not charged all with condensing unit in stop mode, operate the condensing unit and charge the liquid refrigerant from the service port of liquid stop valve. The additional charging operation is activated by Branch Selector button switch on the condensing unit PCB.
Page 132 Field Setting from Condensing Unit SiUS30-1301 Caution Refrigerant cannot be charged until field wiring has been completed. Refrigerant may only be charged after performing the leak test and the vacuum drying. When charging a system, care shall be taken that its maximum permissible charge is never exceeded, in view of the danger of liquid hammer.
Page 133 SiUS30-1301 Field Setting from Condensing Unit  Procedures for charging additional refrigerant. [Heat Pump system] Close Close Gas side Liquid Condensing Condensing Pressure side unit unit reducing valve Charge hose R-410A Valve A Refrigerant tank With a siphon Stop valve service port To Indoor unit Measuring instrument Vacuum pump...
Page 134 Field Setting from Condensing Unit SiUS30-1301 Closing stop valve 1. Remove the cap and turn the valve clockwise with the hexagon wrench (JISB4648). 2. Securely tighten the valve until the shaft contacts the main body seal. 3. Make sure to tighten the cap securely. ...
Page 135 SiUS30-1301 Field Setting from Condensing Unit 3.7.5 Setting of Refrigerant Recovery Mode When carrying out the refrigerant collection on site, fully open the respective electronic expansion valve of indoor and condensing units [Operation procedure] (1) In setting mode 2 with units in stop mode, set “B Refrigerant Recovery / Vacuuming mode” to ON. The respective electronic expansion valve of indoor and condensing units are fully opened.
Page 136 Field Setting from Condensing Unit SiUS30-1301 3.7.7 Check Operation To prevent any trouble in the period of installation at site, the system is provided with a test operation mode enabling check for incorrect wiring, stop valve left in closed, coming out (or misplacing with suction pipe thermistor) of discharge pipe thermistor and judgement of piping length, refrigerant overcharging, and learning for the minimum opening degree of electronic expansion valve.
Page 137: Emergency Operation
SiUS30-1301 Emergency Operation 4. Emergency Operation If the compressor cannot operate, this control inhibits any applicable compressor or condensing unit from operating to perform emergency operation only with the operative compressor or condensing unit. Caution "For making a compressor unable to operate due to error, etc., be sure to conduct the work with emergency operation setting.
Page 138 Emergency Operation SiUS30-1301 • To inhibit the master unit from operating  Set setting mode 2 from No. 38 to LED display (k: ON : OFF : Blink) No. 2. H1P---H7P (Procedure) (1) Press and hold the MODE button (BS1) for 5 sec. or more. (2) Press the SET button (BS2) 38 times.
Page 139: Part 6 Service Diagnosis
SiUS30-1301 Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............133 2. Troubleshooting by Remote Controller ...........136 2.1 Self-diagnosis by Wired Remote Controller ..........137 2.2 Self-diagnosis by Wireless Remote Controller ......... 138 2.3 Remote Controller Self-Diagnosis Function ..........140 2.4 Error Codes - Sub Codes ................. 141 2.5 Error Codes and Description ..............
Page 140 SiUS30-1301 3.33 Inverter Radiation Fin Temperature Rise Abnormality ......200 3.34 Momentary Overcurrent of Inverter Compressor........202 3.35 Momentary Overcurrent of Inverter Compressor........204 3.36 Inverter Compressor Startup Error ............206 3.37 Transmission Error between Inverter and Condensing Unit Main PCB ......................
Page 141: Symptom-Based Troubleshooting
SiUS30-1301 Symptom-based Troubleshooting 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 142 Symptom-based Troubleshooting SiUS30-1301 Symptom Supposed 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 143 SiUS30-1301 Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure 11 The system <Indoor unit> These are operating sounds of the Normal operation. produces Immediately after turning ON electronic expansion valve of the This sound becomes low after a sounds. the power supply, indoor unit indoor unit.
Page 144: Troubleshooting By Remote Controller
Troubleshooting by Remote Controller SiUS30-1301 2. Troubleshooting by Remote Controller On power-up, the message "Checking the connection. Please standby." will be displayed on the remote controller screen. Then that message will disappear and the basic screen will be displayed. To access a mode from the basic screen, refer to the figure below. When any of the operation buttons is pressed, the backlight will come on and remains lit for about 30 seconds.
Page 145: Self-Diagnosis By Wired Remote Controller
SiUS30-1301 Troubleshooting by Remote Controller Self-diagnosis by Wired Remote Controller 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 146: Self-Diagnosis By Wireless Remote Controller
Troubleshooting by Remote Controller SiUS30-1301 Self-diagnosis by Wireless Remote Controller In the Case of BRC7C Type / BRC7E Type / BRC4C Type If equipment stops due to an error, the operation indicating LED on the light reception section 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 147 SiUS30-1301 Troubleshooting by Remote Controller  The lower digit of the code changes as shown below when the UP and DOWN buttons are pressed. "UP" button "DOWN" button Normal status Enters inspection mode from normal status when the INSPECTION/TEST button is pressed. 1 Press INSPECTION/TEST button.
Page 148: Remote Controller Self-Diagnosis Function
Troubleshooting by Remote Controller SiUS30-1301 Remote Controller Self-Diagnosis Function 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 149: Error Codes - Sub Codes
SiUS30-1301 Troubleshooting by Remote Controller Error Codes - Sub Codes If an error code like the one shown below is displayed when the navigation remote controller (BRC1E71/72) is in use, make a detailed diagnosis or a diagnosis of the relevant unit referring to the attached list of detailed error codes.
Page 150 Troubleshooting by Remote Controller SiUS30-1301 Troubleshooting Error code Description of error Description of diagnosis F3 - 01 Discharge pipe temperature error (Master) Refer to the “F3” flow chart of each manual and make a F3 - 03 Discharge pipe temperature error (Slave 1) diagnosis of the relevant unit based on the Error code shown to the left.
Page 151 SiUS30-1301 Troubleshooting by Remote Controller Troubleshooting Error code Description of error Description of diagnosis J6 - 01 Faulty heat exchanger thermistor (Master) Refer to the “J6” flow chart of each manual and make a J6 - 02 Faulty heat exchanger thermistor (Slave 1) diagnosis of the relevant thermistor based on the Error code shown to the left.
Page 152 Troubleshooting by Remote Controller SiUS30-1301 Troubleshooting Error code Description of error Description of diagnosis L8 - 03 INV. compressor instantaneous overcurrent error (Master) Refer to the “L8” flow chart of each manual and make a L8 - 06 INV. compressor instantaneous overcurrent error diagnosis of the relevant compressor of the relevant unit based (Slave 1) on the Error code shown to the left.
Page 153: Error Codes And Description
SiUS30-1301 Troubleshooting by Remote Controller Error Codes and Description Error code Operation Error contents Page lamp Referred Indoor Unit External Protection Device Abnormality PCB Abnormality Drain Level Control System (S1L) Abnormality Fan Motor (M1F) Lock, Overload Indoor Unit Fan Motor Abnormality 158, 159 Overload / Overcurrent / Lock of Indoor Unit Fan Motor Swing Flap Motor (M1S) Abnormality...
Page 154 Troubleshooting by Remote Controller SiUS30-1301 Error code Operation Error contents Page lamp Referred System Refrigerant Shortage Alert Open Phase Power Supply Insufficient or Instantaneous Failure Check Operation is not Executed Transmission Error between Indoor Units and Condensing Units Transmission Error between Remote Controller and Indoor Unit Transmission Error between Condensing Units Transmission Error between Main and Sub Remote Controllers Transmission Error between Indoor and Condensing Units in the Same...
Page 155: Error Code Indication By Condensing Unit Pcb
SiUS30-1301 Troubleshooting by Remote Controller Error Code Indication by Condensing Unit PCB To enter the monitor mode, press Contents of error Error code the MODE button (BS1) when in “Setting mode 1”. Abnormal discharge pressure HPS activated Abnormal suction pressure Abnormal Pe Compressor lock Detection of INV.
Page 156 Troubleshooting by Remote Controller SiUS30-1301 Confirmation of error 1 Confirmation of error 2 Confirmation of error 3 Error code LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED1 LED2 LED3 LED4 LED5 LED6 LED7 : ON : ON Error code 1st...
Page 157 SiUS30-1301 Troubleshooting by Remote Controller To enter the monitor mode, press Contents of error Error code the MODE button (BS1) when in “Setting mode 1”. Refrigerant shortage Refrigerant shortage alarm Reverse phase Reverse phase error Abnormal power supply voltage Insufficient inverter voltage ∗...
Page 158 Troubleshooting by Remote Controller SiUS30-1301 Confirmation of error 1 Confirmation of error 2 Confirmation of error 3 Error code LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED1 LED2 LED3 LED4 LED5 LED6 LED7 : ON : ON Error code 1st...
Page 159: Troubleshooting By Indication On The Remote Controller
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3. Troubleshooting by Indication on the Remote Controller External Protection Device Abnormality Error Code Applicable All indoor models Models Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals with the remote controller set to...
Page 160: Pcb Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 PCB Abnormality Error Code Applicable All indoor models Models Method of Error Check data from E²PROM. Detection Error Decision When data could not be correctly received from the E²PROM E²PROM : Type of nonvolatile memory. Maintains memory contents even when the power supply Conditions is turned off.
Page 161: Drain Level Control System (S1L) Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller Drain Level Control System (S1L) Abnormality Error Code Applicable FXFQ, FXZQ, FXDQ, FXMQ-P, FXMQ-M (Option), FXHQ (Option), FXAQ (Option) Models Method of Error By float switch OFF detection Detection Error Decision When rise of water level is not a condition and the float switch goes OFF. Conditions ...
Page 162 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is power supply 208~230V Provide 220~240V power provided? supply. A short float switch is circuit connected to X8A or connector is connected...
Page 163: Fan Motor (M1F) Lock, Overload
SiUS30-1301 Troubleshooting by Indication on the Remote Controller Fan Motor (M1F) Lock, Overload Error Code Applicable FXAQ, FXFQ, FXHQ Models Method of Error Abnormal fan revolutions are detected by a signal output from the fan motor. Detection Error Decision When the fan revolutions do not increase Conditions ...
Page 164 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply, and then wait for a period of 10 minutes. there any Remove the foreign matters.
Page 165 SiUS30-1301 Troubleshooting by Indication on the Remote Controller 1. If any junction connector is provided between the connector (X20A) on the indoor unit PCB and Note: the fan motor, also check whether or not the junction connector is properly connected. 2.
Page 166: Indoor Unit Fan Motor Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 Indoor Unit Fan Motor Abnormality Error Code Applicable FXDQ Models Method of Error This error is detected if there is no revolutions detection signal output from the fan motor. Detection Error Decision When no revolutions can be detected even at the maximum output voltage to the fan Conditions ...
Page 167: Indoor Unit Fan Motor Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller Indoor Unit Fan Motor Abnormality Error Code Applicable FXMQ18~48P Models Method of Error Error from the current flow on the fan PCB Detection Error from the RPM of the fan motor in operation Error from the position signal of the fan motor Error from the current flow on the fan PCB when the fan motor starting operation ...
Page 168 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power and wait for 10 minutes. There is a foreign matter around Remove the foreign matter.
Page 169 SiUS30-1301 Troubleshooting by Indication on the Remote Controller resistance among U, V, and W Replace the fan motor. are unbalanced or short circuited. Remove the signal connector from the fan motor and check the resistance (∗2). Between Vcc and GND terminals, and Replace the fan motor.
Page 170 Troubleshooting by Indication on the Remote Controller SiUS30-1301 1. Check on connector of fan motor (Power supply cable) Note: Turn OFF the power supply. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.
Page 171: Overload / Overcurrent / Lock Of Indoor Unit Fan Motor
SiUS30-1301 Troubleshooting by Indication on the Remote Controller Overload / Overcurrent / Lock of Indoor Unit Fan Motor Error Code Applicable FXMQ-M Models Method of Error This error is detected by detecting that the individual power supply for the fan turns OFF. Detection Error Decision When it is not detected that the individual power supply for the indoor unit fan turns ON while in...
Page 172: Swing Flap Motor (M1S) Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 Swing Flap Motor (M1S) Abnormality Error Code Applicable FXHQ Models Method of Error Utilizes ON/OFF of the limit switch when the motor turns. Detection Error Decision When ON/OFF of the micro-switch for positioning cannot be reversed even though the swing flap motor is energized for a specified amount of time (about 30 seconds).
Page 173 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is power supply Provide 208~230V power 208~230V provided? supply. Indoor unit is a model equipped with a swing Replace the indoor unit PCB.
Page 174: Power Supply Voltage Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 Power Supply Voltage Abnormality Error Code Applicable FXMQ07~48P Models Method of Error Detect error checking the input voltage of fan motor. Detection Error Decision When the input voltage of fan motor is 150V or less, or 386V or more. Conditions ...
Page 175: Electronic Expansion Valve Coil Abnormality / Dust Clogging
SiUS30-1301 Troubleshooting by Indication on the Remote Controller Electronic Expansion Valve Coil Abnormality / Dust Clogging Error Code Applicable FXFQ Models Method of Error Check coil condition of electronic expansion valve by using micro-computer. Check dust clogging condition of electronic expansion valve main body by using micro-computer. Detection Error Decision Pin input for electronic expansion valve coil is abnormal when initializing micro-computer.
Page 176: Coil Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 Electronic Expansion Valve Coil Abnormality Error Code Applicable Indoor units except FXFQ models Models Method of Error Check coil condition of electronic expansion valve by using micro-computer. Detection Error Decision Pin input for electronic expansion valve coil is abnormal when initializing micro-computer. Conditions ...
Page 177: Drain Level Above Limit
SiUS30-1301 Troubleshooting by Indication on the Remote Controller Drain Level above Limit Error Code Applicable FXFQ, FXZQ, FXMQ, FXDQ Models Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is in non- Detection operation.
Page 178: Capacity Determination Device Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 Capacity Determination Device Abnormality Error Code Applicable All indoor models Models Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.
Page 179: Transmission Abnormality Between Indoor Unit Pcb And Fan Pcb
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.10 Transmission Abnormality between Indoor Unit PCB and Fan PCB Error Code Applicable FXMQ07~48P Models Method of Error Check the condition of transmission between indoor unit PCB (A1P) and fan PCB (A2P) using Detection computer.
Page 180 Troubleshooting by Indication on the Remote Controller SiUS30-1301 1. Pull out and insert the connecter once and check it is absolutely connected. Note: 2. Method to check transmission part of indoor unit PCB. N Turn OFF the power and remove the connecter X70A of indoor unit PCB (A1P). O Short circuit X70A.
Page 181: Thermistor Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.11 Thermistor Abnormality C4, C5, C9 Error Code Applicable All indoor models Models Method of Error The error is detected by temperature detected by thermistor. Detection Error Decision When the thermistor becomes disconnected or shorted while the unit is running. Conditions ...
Page 182: Combination Error Between Indoor Unit Pcb And Fan Pcb
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.12 Combination Error between Indoor Unit PCB and Fan PCB Error Code Applicable FXMQ07~48P Models Method of Error Check the condition of transmission with fan PCB (A2P) using indoor unit PCB (A1P). Detection Error Decision When the communication data of fan PCB (A2P) is determined as incorrect.
Page 183: Remote Sensor Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.13 Remote Sensor Abnormality Error Code Applicable FXTQ Models Method of Error The error is detected out by temperature detected by remote sensor. Detection Error Decision When the remote sensor becomes disconnected or shorted while the unit is running. Conditions ...
Page 184: Thermistor Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.14 Thermistor Abnormality Error Code Applicable FXMQ07~48P Models Method of Error The error is detected by temperature detected by thermistor. Detection Error Decision When the thermistor becomes disconnected or shorted while the unit is running. Conditions ...
Page 185: Humidity Sensor System Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.15 Humidity Sensor System Abnormality Error Code Applicable FXFQ Models Method of Error Even if an error occurs, operation still continues. Detection Error is detected according to the moisture (output voltage) detected by the moisture sensor. Error Decision When the moisture sensor is disconnected or short circuited Conditions...
Page 186: Room Temperature Thermistor In Remote Controller Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.16 Room Temperature Thermistor in Remote Controller Abnormality Error Code Applicable All indoor models Models Method of Error Error detection is carried out by temperature detected by room temperature thermistor in remote controller.
Page 187: Pcb Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.17 PCB Abnormality Error Code Applicable RWEYQ72P, 84P Models Method of Error Abnormality is detected under the communication conditions in the hardware section between the Detection indoor unit and condensing unit. Error Decision When the communication conditions in the hardware section between the indoor unit and the condensing unit are not normal.
Page 188: Ground Leakage By Leak Detection Pcb Assy
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.18 Ground Leakage by Leak Detection PCB Assy Error Code Applicable RWEYQ72P, 84P Models Method of Error Failure is to be detected by using leak detection PCB assy. Detection Error Decision Leakage is detected under the conditions condensing of the scope of high pressure switch operation.
Page 189 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Turn ON the power supply. Check whether there is continuity between No continuity (∗2) Replace the both X3A ends of the ground leakage ground leakage detection PCB detection PCB. (A3P). (A3P) Continuity Check whether there No continuity...
Page 190: Actuation Of High Pressure Switch
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.19 Actuation of High Pressure Switch Error Code Applicable RWEYQ72P, 84P Models Method of Error The error is detected by the protection device circuit that detects continuity at high pressure switch. Detection Error Decision When the protector circuit is partially opened (Reference) Operating pressure of high pressure switch...
Page 191 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Service Checker Connect the service checker to compare the “high pressure” value and the actual measurement value by pressure sensor (*1) by using the service checker. Check if the “high pressure” value and the actual Replace the condensing unit measurement value by...
Page 192: Actuation Of Low Pressure Sensor
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.20 Actuation of Low Pressure Sensor Error Code Applicable RWEYQ72P, 84P Models Method of Error Abnormality is detected by the pressure value with the low pressure sensor. Detection Error Decision Error is generated when the low pressure is dropped under compressor operation. Operating pressure: 10.15 psi Conditions ...
Page 193 SiUS30-1301 Troubleshooting by Indication on the Remote Controller 1. Make a comparison between the voltage of the pressure sensor and that read by the pressure Note: gauge. (As to the voltage of the pressure sensor, make measurement of voltage at the connector, and then convert it to pressure according to information on P.251.) 2.
Page 194: Inverter Compressor Motor Lock
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.21 Inverter Compressor Motor Lock Error Code Applicable RWEYQ72P, 84P Models Method of Error Inverter PCB takes the position signal from UVW line connected between the inverter and Detection compressor, and the error is detected when any abnormality is observed in the phase-current waveform.
Page 195 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Restart and check the operation. Conclude the work Check if the condition There is a possibility of defective occurs again. pressure equalizing. Check the refrigerant circuit. Power ON Is the start mode in the high differential Defective of pressure equalizing pressure (not less...
Page 196: Electronic Expansion Valve Coil (Y1E~Y5E) Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.22 Electronic Expansion Valve Coil (Y1E~Y5E) Abnormality Error Code Applicable RWEYQ72P, 84P Models Method of Error Check disconnection of connector Detection To be detected based on continuity existence of electronic expansion valve coil Error Decision No current is detected in the common (COM [+]) when power supply is ON.
Page 197 SiUS30-1301 Troubleshooting by Indication on the Remote Controller 1: Coil check method for the electronic expansion valve coil Note: Discount the electronic expansion valve from the PCB and check the continuity between the connector pins. (Normal) Pin No. 1. White 2.
Page 198: Abnormal Discharge Pipe Temperature
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.23 Abnormal Discharge Pipe Temperature Error Code Applicable RWEYQ72P, 84P Models Method of Error Abnormality is detected according to the temperature detected by the discharge pipe temperature Detection thermistor. Error Decision When the discharge pipe temperature rises to an abnormally high level (275 °F or more) When the discharge pipe temperature rises suddenly (248 °F or more for 10 successive minutes) Conditions ...
Page 199: Refrigerant Overcharged
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.24 Refrigerant Overcharged Error Code Applicable RWEYQ72P, 84P Models Method of Error The error is detected according to the temperature detected by the discharge pipe temperature Detection during check operation Error Decision When the discharge pipe temperature drops during check operation Conditions ...
Page 200 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Carry out check operation again. Error is Continue the operation. displayed again? There is a possibility that there are other causes of refrigerant overfilling. : Remove the causes of wet operation. CHECK 5 CHECK 5 Refer to P.245.
Page 201: Water System Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.25 Water System Abnormality Error Code Applicable RWEYQ72P, 84P Models  Detect abnormalities using the thermistor on the heat exchanger gas side. Method of Error  Detect turned OFF interlock circuit. Detection (When interlock setting is provided.) ...
Page 202 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Is the connection between the thermistor on the heat exchanger gas side (R4T) Connect the connector properly. and the low pressure sensor (S1NPL) proper? Are characteristics of the thermistor on the heat exchanger gas side Replace the thermistor/sensor if (R4T) and the low any of its characteristics are...
Page 203: Thermistor System Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.26 Thermistor System Abnormality J3, J4, J5, J7, J9 Error Code Applicable RWEYQ72P, 84P 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...
Page 204: High Pressure Sensor Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.27 High Pressure Sensor Abnormality Error Code Applicable RWEYQ72P, 84P 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 611.9 psi, or 1.45 psi and below) Conditions ...
Page 205 SiUS30-1301 Troubleshooting by Indication on the Remote Controller 1. Connector code Note: Model name Connector RWEYQ72/84PTJU X46A RWEYQ72/84PTJU9 X32A RWEYQ72/84PYDN CHECK 12 Refer to P.251. CHECK 13 Refer to P.251. Service Diagnosis...
Page 206: Low Pressure Sensor Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.28 Low Pressure Sensor Abnormality Error Code Applicable RWEYQ72P, 84P Models Method of Error Error is detected from pressure detected by low pressure sensor. Detection Error Decision When the low pressure sensor is short circuit or open circuit (Not less than 256.65 psi, or -1.45 psi and below) Conditions ...
Page 207 SiUS30-1301 Troubleshooting by Indication on the Remote Controller 1. Connector code Note: Model name Connector RWEYQ72/84PTJU X45A RWEYQ72/84PTJU9 X31A RWEYQ72/84PYDN CHECK 12 Refer to P.251. CHECK 14 Refer to P.251. Service Diagnosis...
Page 208: Inverter Radiation Fin Temperature Rise Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.29 Inverter Radiation Fin Temperature Rise Abnormality Error Code Applicable RWEYQ72P, 84P Models Method of Error Fin temperature is detected by the thermistor of the radiation fin. Detection Error Decision When the temperature of the inverter radiation fin increases 188.6°F or more Conditions ...
Page 209 SiUS30-1301 Troubleshooting by Indication on the Remote Controller 1 Connector code Note: Model name Connector RWEYQ72/84PTJU RWEYQ72/84PTJU9 RWEYQ72/84PYDN X111A CHECK 11 Refer to P.250. Service Diagnosis...
Page 210: Momentary Overcurrent Of Inverter Compressor
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.30 Momentary Overcurrent of Inverter Compressor Error Code Applicable RWEYQ72P, 84P Models Method of Error Error is detected from current flowing in the power transistor. Detection Error Decision When an excessive current flows in the power transistor (Instantaneous overcurrent also causes activation.) Conditions ...
Page 211 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Compressor inspection Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the stop valve open? Open the stop valve. Are the compressor lead Replace the compressor wires normal?
Page 212: Momentary Overcurrent Of Inverter Compressor
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.31 Momentary Overcurrent of Inverter Compressor Error Code Applicable RWEYQ72P, 84P Models Method of Error Error is detected by current flowing in the power transistor. Detection Error Decision When overload in the compressor is detected 230V unit: 26.1A for 260 sec.
Page 213 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Output current check Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Is the stop valve Open the stop valve. open? Check if the compressor lead wires Replace the compressor...
Page 214: Inverter Compressor Startup Error
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.32 Inverter Compressor Startup Error Error Code Applicable RWEYQ72P, 84P Models Method of Error Detect the failure based on the signal waveform of the compressor. Detection Error Decision Starting the compressor does not complete. Conditions ...
Page 215 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Continued from the previous page. (Starting error due to aged operation.) Refrigerant is melting in refrigerant oil. (The unit Cancel the melting state of is out of power supply refrigerant. for more than 6 hours.) Is the insulation...
Page 216: Transmission Error Between Inverter And Condensing Unit
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.33 Transmission Error between Inverter and Condensing Unit Main PCB Error Code Applicable RWEYQ72P, 84P Models Method of Error Check the communication state between inverter PCB and condensing unit main PCB by micro- computer.
Page 217: Pcb
SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Are the connectors of the condensing unit main PCB Properly connect the connectors. and inverter PCB all securely connected?
Page 218: Inverter Over-Ripple Protection
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. 1: Measure voltage at the X1M power supply terminal block. Note: 2: Measure voltage at terminals R, S and T of the diode module inside the inverter PCB while the...
Page 219: Inverter Radiation Fin Temperature Thermistor Rise Abnormality
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.35 Inverter Radiation Fin Temperature Thermistor Rise Abnormality Error Code Applicable RWEYQ72P, 84P Models Method of Error Resistance of radiation fin thermistor is detected when the compressor is not operating. Detection Error Decision When the resistance value of thermistor becomes a value equivalent to open circuited or short Conditions circuited status...
Page 220: Field Setting Abnormality After Replacing Condensing Unit Main Pcb Or Combination Of Pcb Abnormality
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.36 Field Setting Abnormality after Replacing Condensing Unit Main PCB or Combination of PCB Abnormality Error Code Applicable RWEYQ72P, 84P 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 221: Refrigerant Shortage Alert
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.37 Refrigerant Shortage Alert Error Code Applicable RWEYQ72P, 84P Models Method of Error Detect refrigerant shortage based on the temperature difference between low pressure equivalent Detection saturation temperature or suction pipe and heat exchanger temperature. Error Decision [In cooling] Low pressure becomes 14.5 psi or less.
Page 222 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. In cooling Set up a pressure gauge at the service port on the low pressure side.
Page 223: Open Phase
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.38 Open Phase Error Code Applicable RWEYQ72P, 84P Models Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or Detection reverse phase are judged. Error Decision When a power supply is reverse phase, or T phase is open phase Conditions...
Page 224: Power Supply Insufficient Or Instantaneous Failure
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.39 Power Supply Insufficient or Instantaneous Failure Error Code Applicable RWEYQ72P, 84P 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 780V or not more than 320V, or when the...
Page 225 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check if power supply Correct the power voltage is 208/230V ±10% supply voltage. or 460V ±10%? Is the resistance between...
Page 226: Check Operation Is Not Executed
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.40 Check Operation is not Executed Error Code Applicable RWEYQ72P, 84P Models Method of Error Check operation is executed or not executed. Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions ...
Page 227: Transmission Error Between Indoor Units And Condensing Units
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.41 Transmission Error between Indoor Units and Condensing Units Error Code Applicable All indoor models Models RWEYQ72P, 84P Method of Error Micro-computer checks if transmission between indoor and condensing units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
Page 228 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check if indoor unit PCB or condensing unit PCB has been replaced. Or Press the RESET button on the check if indoor-condensing, condensing-condensing...
Page 229: Transmission Error Between Remote Controller And Indoor Unit
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.42 Transmission Error between Remote Controller and Indoor Unit Error Code Applicable All indoor models Models Method of Error Micro-computer checks if transmission between indoor unit and remote controller is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions...
Page 230: Transmission Error Between Condensing Units
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.43 Transmission Error between Condensing Units Error Code Applicable RWEYQ72P, 84P Models Method of Error Micro-computer checks if transmission between condensing units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions ...
Page 231 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the LED lamps for “Check 3” corresponding to the error code “ ”...
Page 232 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Diagnosis Flow 1 Check of error 3 Check of error 4 Check if any disconnection or connection error is detected in relay wires with Correct the connecting wiring external control adaptor with the external control adaptor for condensing for condensing unit.
Page 233 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Diagnosis Flow 2 Check of error 3 Check of error 4 Cool/Heat selection is unified. C/H SELECT of the external control adaptor for condensing unit is set to “IND”. Setting of C/H SELECT of the external control The unified addresses for adaptor for condensing unit...
Page 234 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Diagnosis Flow 3 Check of error 3 Check of error 4 Check the connection status of relay wires of the condensing multi to SLAVE Replace the condensing unit 1. Check if the wiring is disconnected or is about to main PCB of the SLAVE 1.
Page 235 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Diagnosis Flow 6 Check of error 3 Check of error 4 Check the connection status of one of the relay wires of Replace the condensing unit main condensing multi. Check if the PCB.
Page 236: Transmission Error Between Main And Sub Remote Controllers
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.44 Transmission Error between Main and Sub Remote Controllers Error Code Applicable All indoor models Models Method of Error In case of controlling with 2-remote controllers, check the system using micro-computer if signal transmission between indoor unit and remote controller (main and sub) is normal.
Page 237: Transmission Error Between Indoor And Condensing Units In The Same System
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.45 Transmission Error between Indoor and Condensing Units in the Same System Error Code Applicable All indoor models Models RWEYQ72P, 84P Method of Error Detect the error signal for the other indoor units within the circuit by condensing unit PCB. Detection Error Decision When the error decision is made on any other indoor unit within the system concerned.
Page 238: Improper Combination Of Indoor, Branch Selector And Condensing Units
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.46 Improper Combination of Indoor, Branch Selector and Condensing Units Error Code Applicable All indoor models Models Branch Selector unit RWEYQ72P, 84P  A difference occurs in data by the type of refrigerant between indoor, Branch Selector and Method of Error Detection condensing units.
Page 239 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the LED lamps for “Confirmation of error 3” corresponding to the error code “ ”...
Page 240 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Diagnosis Flow 2 Check of error 3 Check of error 4 Check if the refrigerant type of the condensing unit Replace the condensing unit corresponds to that of main PCB. the indoor unit. Match the refrigerant types of the condensing unit and the indoor unit.
Page 241 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Check of error 3 Check of error 4 Is the model BSVQ-P Connect the model BSVQ-P. connected? Replace the condensing unit PCB as shown below. • With single systems, replace the service monitor PCB 1 (A1P). •...
Page 242: Address Duplication Of Centralized Control Equipment
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.47 Address Duplication of Centralized Control Equipment Error Code Applicable All indoor models Models Central remote 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 243: Transmission Error Between Centralized Control Equipment And Indoor Unit
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.48 Transmission Error between Centralized Control Equipment and Indoor Unit Error Code Applicable All indoor models intelligent Touch Controller Models intelligent Touch Manager Central remote controller Schedule timer Method of Error Micro-computer checks if transmission between indoor unit and centralized control equipment is Detection normal.
Page 244 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the indoor unit for which “ ” is displayed. Is the Continued to A (on the transmission error “...
Page 245 SiUS30-1301 Troubleshooting by Indication on the Remote Controller Check transmission wiring between centralized control equipment for any broken Abnormal Correct the wiring. wire. For details, refer to information in the “Procedure for checking broken wires” section. Normal Check transmission wiring between main centralized control equipment for any broken Abnormal...
Page 246: System Is Not Set Yet
Troubleshooting by Indication on the Remote Controller SiUS30-1301 3.49 System is not Set yet Error Code Applicable All indoor models Models RWEYQ72P, 84P Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that Detection of indoor units that have made changes in temperature.
Page 247: System Error, Refrigerant System Address Undefined
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.50 System Error, Refrigerant System Address Undefined Error Code Applicable All indoor models Models RWEYQ72P, 84P 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 ...
Page 248 Troubleshooting by Indication on the Remote Controller SiUS30-1301 Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. electricity Does an being introduce for error occur even the first time after after 12 minutes Normal installation or after an indoor...
Page 249: Check
SiUS30-1301 Troubleshooting by Indication on the Remote Controller 3.51 Check CHECK 1 Check for Causes of Rise in High Pressure Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points.  Check to be sure the stop valve is open. Stop valve closed Local High pipe...
Page 250 Troubleshooting by Indication on the Remote Controller SiUS30-1301 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? (See 1.) Defective low pressure sensor Defective ...
Page 251 SiUS30-1301 Troubleshooting by Indication on the 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  Check if coil resistance and insulation gas bypass valve coil control...
Page 252 Troubleshooting by Indication on the Remote Controller SiUS30-1301 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 253 SiUS30-1301 Troubleshooting by Indication on the 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 Overcharge of refrigerant ¬Refer to information in the CHECK 6 section.
Page 254 Troubleshooting by Indication on the Remote Controller SiUS30-1301 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 255 SiUS30-1301 Troubleshooting by Indication on the Remote Controller CHECK 7 Check for Refrigerant Shortage. In case of VRV Systems, the only way to judge as the refrigerant shortage 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 256 Troubleshooting by Indication on the Remote Controller SiUS30-1301 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 257 SiUS30-1301 Troubleshooting by Indication on the Remote Controller CHECK 9 How to Check the Electronic Expansion Valve Coil Remove the connector for electronic expansion valve (X7A) from PCB. Measure the resistance value between pins and check the continuity to judge the condition. 1) White White (1) 2) Yellow...
Page 258 Troubleshooting by Indication on the Remote Controller SiUS30-1301 CHECK 11 Thermistor Resistance / Temperature Characteristics Indoor unit For suction air Indoor unit For liquid pipe For discharge pipe For gas pipe Condensing unit Condensing unit For suction pipe Condensing unit For radiation fin For heat exchanger gas pipe R4T For discharge pipe...
Page 259 SiUS30-1301 Troubleshooting by Indication on the Remote Controller CHECK 12 Pressure Sensor = 1.38V -0.69 : Output Voltage [High Side] V Detected Pressure = 0.57V -0.28 : Output Voltage [Low Side] V : High pressure : Low pressure High Pressure (P Low Pressure (P Output Voltage (V CHECK 13...
Page 260: Procedure For Mounting / Dismounting Of Switch Box
SiUS30-1301 Part 7 Procedure for Mounting / Dismounting of Switch Box 1. Procedure for Mounting / Dismounting of Switch Box......253 1.1 Procedure for Dismounting............... 253 1.2 Procedure for Mounting................253 Procedure for Mounting / Dismounting of Switch Box...
Page 261: Procedure For Mounting / Dismounting Of Switch Box
SiUS30-1301 Procedure for Mounting / Dismounting of Switch Box 1. Procedure for Mounting / Dismounting of Switch Box Procedure for Dismounting 1. Dismount the lid from the switch box. 2. Disconnect high voltage and low voltage wirings from the PCB and the terminal blocks, referring to Figure below.
Page 262 Procedure for Mounting / Dismounting of Switch Box SiUS30-1301 Screw/Unscrew the mounting screws. Connect/Disconnect the wirings. Procedure for Mounting / Dismounting of Switch Box...
Page 263: Part 8 Appendix
SiUS30-1301 Part 8 Appendix 1. Piping Diagrams..................256 1.1 Indoor Unit....................256 1.2 Branch Selector Unit ................258 1.3 Centralized Branch Selector Unit ............. 259 2. Wiring Diagrams for Reference...............260 2.1 Condensing Unit..................260 2.2 Indoor Unit....................263 2.3 Branch Selector Unit ................268 2.4 Centralized Branch Selector Unit .............
Page 264: Piping Diagrams
Piping Diagrams SiUS30-1301 1. Piping Diagrams Indoor Unit FXFQ 09P / 12P / 18P / 24P / 30P / 36P / 48PVJU FXZQ 07M7 / 09M7 / 12M7 / 18M7VJU FXMQ 07P / 09P / 12P / 18P / 24P / 30P / 36P / 48PVJU FXMQ72M / 96MVJU FXHQ 12M / 24M / 36MVJU FXAQ 07P / 09P / 12P / 18P / 24PVJU...
Page 265 SiUS30-1301 Piping Diagrams FXDQ Gas side Liquid side Electronic expansion valve Filter Filter Indoor heat exchanger 4D043864N  Refrigerant pipe connection port diameters Model Liquid 1/2 1/4 FXDQ07M / 09M / 12M / 18MVJU 5/8 3/8 FXDQ24MVJU Appendix...
Page 266: Branch Selector Unit
Piping Diagrams SiUS30-1301 Branch Selector Unit Liquid pipe Liquid pipe connection port connection port Electronic Double pipe heat Expansion Valve exchanger (EVSC) Filter Capillary tube Electronic Gas pipe Expansion Valve connection port (EVHS) Filter Electronic HP/LP gas pipe Expansion Valve connection port (EVH) Filter...
Page 267: Centralized Branch Selector Unit
SiUS30-1301 Piping Diagrams Centralized Branch Selector Unit BSV4Q36PVJU Suction gas pipe connection port HP/LP gas pipe connection port Liquid pipe connection port Liquid pipe Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe connection port connection port connection port connection port...
Page 268: Wiring Diagrams For Reference
Wiring Diagrams for Reference SiUS30-1301 2. Wiring Diagrams for Reference Condensing Unit RWEYQ72PTJU / RWEYQ84PTJU Appendix...
Page 269 SiUS30-1301 Wiring Diagrams for Reference RWEYQ72PTJU / RWEYQ84PTJU (In case of manufacturing code: RWEYQ72PTJU9 / RWEYQ84PTJU9) Appendix...
Page 270 Wiring Diagrams for Reference SiUS30-1301 RWEYQ72PYDN / RWEYQ84PYDN Appendix...
Page 271: Indoor Unit
SiUS30-1301 Wiring Diagrams for Reference Indoor Unit FXFQ09P / 12P / 18P / 24P / 30P / 36P / 48PVJU INDOOR UNIT PRINTED CIRCUIT BOARD PRINTED CIRCUIT BOARD C105 CAPACITOR POWER SUPPLY FUSE ( B , 5A , 250V ) t°...
Page 272 Wiring Diagrams for Reference SiUS30-1301 FXDQ07M / 09M / 12M / 18M / 24MVJU PRINTED CIRCUIT BOARD CAPACITOR (M1F) FUSE (F5A/250V) LIGHT EMITTING DIODE (SERVICE MONITOR GREEN) MAGNETIC RELAY (M1P) MOTOR (INDOOR FAN) MOTOR (DRAIN PUMP) NOTE) 5 POWER THERMAL PROTECTOR (M1F EMBEDDED) INPUT FROM SUPPLY THERMISTOR (AIR)
Page 273 SiUS30-1301 Wiring Diagrams for Reference FXMQ72M / 96MVJU THERMISTOR (AIR) INDOOR UNIT PRINTED CIRCUIT BOARD THERMISTOR (COIL) R2T · R3T ELECTRICAL COMPONENTS BOX CAPACITOR (M1F · 2F) SELECTOR SWITCH C1R · C2R POWER SUPPLY FUSE ( B , 5A, 250V) (STATIC PRESSURE) TRANSFORMER (280V/230V 25VA) LIGHT EMITTING DIODE...
Page 274 Wiring Diagrams for Reference SiUS30-1301 FXHQ12M / 24M / 36MVJU LIGHT EMITTING DIODE INDOOR UNIT PRINTED CIRCUIT BOARD (DEFROST-ORANGE) NOTE-4 CAPACITOR (M1F) SELECTOR SWITCH (MAIN/SUB) RECEIVER/DISPLAY UNIT FUSE ( B 5A, 250V) SELECTOR SWITCH POWER SUPPLY (WIRELESS REMOTE CONTROLLER) LIGHT EMITTING DIODE (WIRELESS ADDRESS SET) ~208-230V (SERVICE MONITOR-GREEN)
Page 275 SiUS30-1301 Wiring Diagrams for Reference FXTQ12PAVJU / FXTQ18PAVJU / FXTQ24PAVJU / FXTQ30PAVJU / FXTQ36PAVJU / FXTQ42PAVJU / FXTQ48PAVJU / FXTQ54PAVJU INPUT FROM CONDENSING UNIT NOTE) 3 TRANSMISSION WIRING POWER CENTRAL REMOTE SUPPLY CONTROLLER NOTE) 2 NOTE) 7 280/230V WIRED REMOTE 60Hz CONTROLLER (OPTIONAL ACCESSORY)
Page 276: Branch Selectorr Unit
Wiring Diagrams for Reference SiUS30-1301 Branch Selector Unit BSVQ36P / 60P / 96PVJU Appendix...
Page 277: Centralized Branch Selector Unit
SiUS30-1301 Wiring Diagrams for Reference Centralized Branch Selector Unit BSV4Q36PVJU Appendix...
Page 278 Wiring Diagrams for Reference SiUS30-1301 BSV6Q36PVJU Appendix...
Page 279 SiUS30-1301 Wiring Diagrams for Reference Appendix...
Page 280 Be sure to follow these instructions and warnings. If you have any inquiries, please contact your local importer, distributor and/or retailer. Daikin, Daikin AC Absolute Comfort, and its design, VRV, REFNET, and Quaternity are trademarks of Daikin Industries, LTD. All rights reserved. Cautions on product corrosion 1.

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Daikin VRV-WIII RWEYQ72PTJU Service Manual

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