Hokkaido HCKU 471 Z2 Service Manual

Heat pump multisplit models with dc fan motor 1 phase, 220-240v, 50/60hz power supply

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R32

Refrigerant

RAC Multisplit

Air Conditioners

SERVICE MANUAL

Heat Pump Multisplit Models with DC Fan Motor

1 Phase, 220-240V, 50/60Hz Power Supply

Dual, Trial, Poker Outdoor Units Models:

„

HCKU (471, 531) Z2

HCKU (601, 761) Z3

HCKU (810, 1060) Z4

[ Release 1.0 ]

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Page 1 Refrigerant RAC Multisplit Air Conditioners SERVICE MANUAL [ Release 1.0 ] Heat Pump Multisplit Models with DC Fan Motor 1 Phase, 220-240V, 50/60Hz Power Supply Dual, Trial, Poker Outdoor Units Models: „ HCKU (471, 531) Z2 HCKU (601, 761) Z3 HCKU (810, 1060) Z4...
Page 2: Product Overview And Lineup
PRODUCT OVERVIEW AND LINEUP RESIDENTIAL R32 - MULTISPLIT FEATURES MULTISPLIT EER* COP* SEER* SCOP* Outdoor unit 3.23 3.71 HCKU 471 Z2 3.23 3.71 HCKU 531 Z2 3.23 3.71 HCKU 601 Z3 3.23 3.71 HCKU 761 Z3 3.23 4.00 HCKU 810 Z4 3.23...
Page 3 RESIDENTIAL R32 - LINE UP MULTISPLIT 4.10 5.28 6.15 7.91 8.21 10.55 Number of connectable I.U. HCKU 471 Z2 HCKU 531 Z2 HCKU 601 Z3 HCKU 761 Z3 HCKU 810 Z4 HCKU 1060 Z4 • • • • • • HKEMM 262 ZAL •...
Page 4 Energy efficiency values refer to the following combinations: HCKU 471 Z2 + 2 x HKEU 203 ZL - HCKU 531 Z2 + 2 x HKEU 263 ZAL - HCKU 601 Z3 + 3 x HKEU 203 ZL - HCKU 761...
Page 5: Table Of Contents
RAC Multisplit Outdoor Units with R32 Refrigerant Table of Contents PRODUCT OVERVIEW AND LINEUP ....................2 1. GENERAL INFORMATION OF OUTDOOR UNITS ................6 2. FEATURES ............................7 3. DIMENSIONS ............................ 8 4. REFRIGERATION CYCLE DIAGRAMS ..................... 9 5. WIRING DIAGRAMS ........................11 6.
Page 6: General Information Of Outdoor Units
RAC Multisplit Outdoor Units with R32 Refrigerant 1. General information of Outdoor Units Model name Dimensions (mm) Compressor HCKU 471 Z2 805 x 330 x 554 KSN140D58UFZ HCKU 531 Z2 805 x 330 x 554 KSN140D58UFZ HCKU 601 Z3 890 x 342 x 673...
Page 7: Features
RAC Multisplit Outdoor Units with R32 Refrigerant 2. Features Outdoor unit Power relay control Low noise air flow system Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation. Anti-rust cabinet Valve protection cover It protects the valves and prevents water from dripping.
Page 8: Dimensions
RAC Multisplit Outdoor Units with R32 Refrigerant 3. Dimensions Unit: mm Model HCKU 471 Z2 HCKU 531 Z2 HCKU 601 Z3 990.00 HCKU 761 Z3 990.00 HCKU 810 Z4 1034 HCKU 1060 Z4 1034...
Page 9: Refrigeration Cycle Diagrams
RAC Multisplit Outdoor Units with R32 Refrigerant 4. Refrigeration Cycle Diagrams 4.1 Refrigeration circuit drawing of inverter 1 drive 2 type Models HCKU 471 Z2, HCKU 531 Z2 INDOOR OUTDOOR EXV A LIQUID VALVE A CAPILLARY EXV B LIQUID VALVE B Condenser temp.
Page 10 RAC Multisplit Outdoor Units with R32 Refrigerant 4.2 Refrigeration circuit drawing of inverter 1 drive 3 type Models HCKU 601 Z3, HCKU 761 Z3 INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B CAPILLARY TUBE LIQUID VALVE B EXV C Condenser LIQUID VALVE C temp.
Page 11: Wiring Diagrams
RAC Multisplit Outdoor Units with R32 Refrigerant 5. Wiring Diagrams Models HCKU 471 Z2, HCKU 531 Z2 BROWN 4 -WAY CRANKCASE HEATER HE ATER BLUE CA PACI T OR BLACK 16022300002793...
Page 12 RAC Multisplit Outdoor Units with R32 Refrigerant Note: S(1) & S(2) are used in other type of models. They don't need to be connected in multi models.
Page 13 RAC Multisplit Outdoor Units with R32 Refrigerant Models HCKU 601 Z3, HCKU 761 Z3...
Page 14 RAC Multisplit Outdoor Units with R32 Refrigerant Model HCKU 810 Z4...
Page 15 RAC Multisplit Outdoor Units with R32 Refrigerant Model HCKU 1060 Z4...
Page 16: Indoor Units Combinations
RAC Multisplit Outdoor Units with R32 Refrigerant 6. Indoor Units Combinations 6.1 Indoor Unit Combinations for HCKU 471 Z2 One Unit Two Units 9+12 7+12 6.2 Indoor Unit Combinations for HCKU 531 Z2 One Unit Two Units 9+12 7+12 12+12 6.3 Indoor Unit Combinations for HCKU 601 Z3...
Page 17 RAC Multisplit Outdoor Units with R32 Refrigerant 6.6 Indoor Unit Combinations for HCKU 1060 Z4 One Unit Two Units Three Units Four Units 9+18 7+7+7 7+9+12 7+18+18 9+12+18 7+7+7+7 7+7+9+12 7+9+9+12 9+9+9+12 9+24 7+7+9 7+9+18 9+9+9 9+12+24 7+7+7+9 7+7+9+18 7+9+9+18 9+9+9+18 7+12 12+12 7+7+12 7+9+24...
Page 18: Sound Levels
7. Sound Levels Outdoor Unit Microphone 1.0m Note: H = 0.5 × Height of Outdoor Unit Model Noise Power dB(A) Noise level dB(A) HCKU 471 Z2 HCKU 531 Z2 HCKU 601 Z3 HCKU 761 Z3 HCKU 810 Z4 HCKU 1060 Z4...
Page 19: Installation Details
RAC Multisplit Outdoor Units with R32 Refrigerant 8. Installation Details N.cm 8.1 Wrench torque sheet for installation Additional tightening torque Outside diameter Torque N•cm N•cm 1500 (153kgf•cm) 1600 (163kgf•cm) Ф6.35 Ф9.52 2500 (255kgf•cm) 2600 (265kgf•cm) 3500 (357kgf•cm) 3600 (367kgf•cm) Ф12.7 8.2 Connecting the cables The power cord size of connected units should be selected according to the following specifications sheet.
Page 20 RAC Multisplit Outdoor Units with R32 Refrigerant Caution: ● Refrigerant pipe diameter is different according to indoor unit models to be connected. When using the extension pipe, refer to the tables below. ● When refrigerant pipe diameter is different from that of outdoor unit union (for 5.3kW and 7.1kW Indoor Units), additional transfer connector needs to be used on outdoor unit union.
Page 21: Installation For The First Time
RAC Multisplit Outdoor Units with R32 Refrigerant 8.4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below: ● Pressure in the system rises. ● Operating current rises. ● Cooling or heating efficiency drops. ●...
Page 22 RAC Multisplit Outdoor Units with R32 Refrigerant 8.4.1 Air purging with vacuum pump (Indoor unit) (Outdoor unit) (Liquid side) Two-way valve Close (Gas side) Three-way valve Gauge manifold Close Compound meter Pressure gauge -0.1MPa Handle Lo Handle Hi Charge hose Charge hose No-return valve Vacuum pump...
Page 23 RAC Multisplit Outdoor Units with R32 Refrigerant 8.4.2 Adding the refrigerant if the piping length exceeds the chargeless pipe length (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) Check valve 3-way valve Open OPEN CLOSE Electronic scale Procedure: 1) Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve.
Page 24: Adding The Refrigerant After Running The System For Many Years
RAC Multisplit Outdoor Units with R32 Refrigerant 8.5 Adding the refrigerant after running the system for many years (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) Check valve 3-way valve Open OPEN CLOSE Electronic scale Procedure: 1) Connect the charge hose to the 3-way valve’s service port, open the 2-way valve and the 3-way valve. Connect the charge hose to the valve at the bottom of the cylinder.
Page 25 RAC Multisplit Outdoor Units with R32 Refrigerant 8.6 Re-installation while the indoor unit needs to be repaired 8.6.1 Collecting the refrigerant into the outdoor unit (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) 3-way valve Close Open Close Procedure: 1) Check that both the 2-way and 3-way valves are set to the opened position.
Page 26 RAC Multisplit Outdoor Units with R32 Refrigerant 8.6.2 Air purging with vacuum pump (Indoor unit) (Outdoor unit) (Liquid side) Two-way valve Close (Gas side) Three-way valve Gauge manifold Close Compound meter Pressure gauge -0.1MPa Handle Lo Handle Hi Charge hose Charge hose No-return valve Vacuum pump...
Page 27 RAC Multisplit Outdoor Units with R32 Refrigerant 8.7 Re-installation while the outdoor unit needs to be repaired 8.7.1 Evacuation for the whole system (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) 3-way valve OPEN Open Vacuum pump CLOSE Procedure: 1) Confirm that both the 2-way and 3-way valves are set to the opened position.
Page 28: Refrigerant Charging
8.7.2 Refrigerant charging (Liquid side) (Indoor unit) (Outdoor unit) 2-way valve Open (Gas side) Check valve 3-way valve Open OPEN CLOSE Electronic scale Procedure: 1) Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.
Page 29: Electronic Control Functions
RAC Multisplit Outdoor Units with R32 Refrigerant 9. Electronic Control Functions 9.1 Abbreviations T1: Indoor ambient temperature. T2: Coil temperature of indoor heat exchanger middle. T2B: Coil temperature of indoor heat exchanger outlet. (This sensor is located in outdoor unit.) T3: Coil temperature of outdoor heat exchanger.
Page 30 RAC Multisplit Outdoor Units with R32 Refrigerant 9.4 Outdoor unit point check function A check switch is included on the outdoor PCB. Push SW1 to check the unit's status while running. The digital display shows the following codes each time the SW1 is pushed. For HCKU 601 Z3, HCKU 761 Z3 Display Remark...
Page 31 RAC Multisplit Outdoor Units with R32 Refrigerant Indoor unit E evaporator temperature (T Condenser pipe temperature (T3) Outdoor ambient temperature (T4) The display value is between 30-129°C. If the temperature is lower than 30°C, the digital display shows “30.” If the temperature is higher than Compressor discharge temperature (TP) 99°C, the digital display shows single and double digits.
Page 32 RAC Multisplit Outdoor Units with R32 Refrigerant For HCKU 1060 Z4 Display Remark Displays running frequency, running state, or malfunction code Normal display Actual data Display Number of indoor unit Quantity of indoor units with working connection Off: 0, Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4, Forced Outdoor unit running mode code defrosting: A, DHW: C, Heating and DHW: d Indoor unit A capacity...
Page 33 RAC Multisplit Outdoor Units with R32 Refrigerant The display value is between 30-129°C. If the temperature is lower than 30°C, the digital display shows “30.” If the temperature is higher than 99°C, Compressor discharge temperature (TP) the digital display shows single and double digits. For example, if the digital display shows “0.5", the compressor discharge temperature is 105°C.
Page 34 RAC Multisplit Outdoor Units with R32 Refrigerant Bit7 Reserved Bit6 Reserved Bit5 Reserved The display value is a decima- Bit4 Reserved lism number. For example, the digital display Bit3 Reserved Indoor unit status shows 07, then Bit2 = 1, Bit1 = Protection from falling off of wa- 1, and Bit0 = 1.
Page 35 RAC Multisplit Outdoor Units with R32 Refrigerant For HCKU (471, 531) Z2, HCKU 810 Z4 Display Remark Displays running frequency, running state, or malfunction code Normal display Actual data Display Number of indoor unit Quantity of indoor units with working connection Off: 0, Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4.
Page 36 RAC Multisplit Outdoor Units with R32 Refrigerant The display value is between 30-129°C. If the temperature is lower than 30°C, the digital display shows “30.” If the temperature is higher than 99°C, the digital display shows single and double digits. For example, if Compressor discharge temperature (TP) the digital display shows “0.5", the compressor discharge temperature is 105°C.
Page 37 RAC Multisplit Outdoor Units with R32 Refrigerant 9.5 Protection 9.5.1 Three-minutes delay at restart for compressor. 9.5.2 Temperature protection of compressor discharge. When the compressor discharge temperature is getting higher, the running frequency will be limited as below: Compressor off Frequency limit Frequency holding Normal...
Page 38 RAC Multisplit Outdoor Units with R32 Refrigerant Heating mode: HeatZone4 HeatZone3 HeatZone2 HeatZone1 9.5.5 Indoor / outdoor units communication protection If the indoor units cannot receive the feedback signal from the outdoor units for 2 minutes, or if the outdoor unit cannot receive the feedback signal from any of the indoor units for 3 minutes, the unit ceases operation and displays the failure.
Page 39: Troubleshooting
RAC Multisplit Outdoor Units with R32 Refrigerant 10. Troubleshooting 10.1 Indoor Unit Error Code Explanation: Please refer to the Service Manual of each Indoor Unit Type.
Page 40: Led Status
RAC Multisplit Outdoor Units with R32 Refrigerant 10.2 Outdoor Unit Error Code Explanation: For HCKU (471, 531) Z2, HCKU 810 Z4, HCKU 1060 Z4 Display LED STATUS Outdoor EEPROM malfunction Indoor / outdoor units communication error Communication malfunction between IPM board and outdoor main board Open or short circuit of outdoor unit temperature sensor (T3, T4,T5) Voltage protection PFC module protection...
Page 41 RAC Multisplit Outdoor Units with R32 Refrigerant For HCKU (601, 761) Z3, HCKU 1201 Z5 Display LED STATUS EC 51 Outdoor EEPROM malfunction EL 01 Indoor / outdoor units communication error PC 40 Communication malfunction between IPM board and outdoor main board PC 08 Outdoor overcurrent protection Outdoor unit low AC voltage protection...
Page 42 RAC Multisplit Outdoor Units with R32 Refrigerant For HCKU (601, 761) Z3, HCKU 1201 Z5 Display LED STATUS EC 52 Condenser coil temperature sensor T3 is in open circuit or has short circuited EC 53 Outdoor room temperature sensor T4 is in open circuit or has short circuited EC 54 Compressor discharge temperature sensor T5 is in open circuit or has short circuited EC 56...
Page 43 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3 Troubleshooting 10.3.1 For the Indoor Unit 10.3.1.1 Indoor EEPROM parameter error Power off, then restart the unit 2 minutes later. Is it still displaying the error code? Replace the indoor main PCB. EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogram- med using a pulsed voltage.
Page 44 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.1.2 Indoor / outdoor units communication error (E1 (IDU) / E2 (ODU) / EL 01 (IDU /ODU) Indoor / outdoor units communication error. Start: Power off, then power on the AC/DC by the breaker (reconnect the power wire).
Page 45 RAC Multisplit Outdoor Units with R32 Refrigerant PIC 1: Check the voltage of N to S (Vs), is it moving alternately between positive value and negative value? Pic 2: Operating Self-Check PIC 2: IPM or outdoor main PCB. Power Self-Check Operating...
Page 46 RAC Multisplit Outdoor Units with R32 Refrigerant PIC 3: Main board LED when power is on and unit is in standby. PIC 4: Check point button. Press once (1 time) to check how many indoor units are connected.
Page 47 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.1.3 Indoor unit fan speed has been out of control Power off then restart the unit 2 minutes later. The unit operates normally. Is it still displaying the error code? Find out the cause and have it sol- Shut off the power supply, ro- ved.
Page 48 RAC Multisplit Outdoor Units with R32 Refrigerant 2. Indoor DC fan motor (control chip is inside fan motor) Power on and when the unit is in standby, measure the voltage of Pin1 - Pin3, Pin4 - Pin3 in fan motor connector. If the value of the voltage is not in the range shown in below table, the PCB must have problems and needs to be repla- ced.
Page 49 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.1.4 Open or short circuit of temperature sensor (IDU E4 / E5 / EH 60 / EH 61) Check the connections be- tween temperature sensor Correct the connections. and PCB. Are the connec- tions good? Measure the resistance value of the sensor via Appendix 1.
Page 50 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.1.6 Communication error between the indoor PCB and display board (IDU Eb / EH 0b) Power off, then restart the unit 2 minutes later. Correct the connection Check the wirings and connection. or replace the wirings. Replace the indoor main PCB.
Page 51 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.1.9 Refrigerant Leakage Detection (IDU EC / EL 0C) Power off, then restart the unit 2 minutes later. Does a problem remain? Put your hands in front of the indoor air outlet Is there cool air blowing Check the T2 sensor.
Page 52 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3 For the outdoor unit 10.3.3.1 Outdoor EEPROM malfunction (ODU E0 / EC 51) Power off, then restart the unit 2 minutes later. Replace the outdoor main PCB. EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and reprogram- med using a pulsed voltage.
Page 53 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.2 Condenser coil temperature sensor T3 is in open circuit or has short circuited (EC 52) Outdoor room temperature sensor T4 is in open circuit or has short circuited (EC 53) Compressor discharge temperature sensor T5 is in open circuit or has short circuited (EC 54) Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited (EC 56) Open or short circuit of outdoor unit temperature sensor (T3, T4, T5) (E4 / EC 50) Check the connection be-...
Page 54 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.3 Communication malfunction between IPM board and outdoor main board (ODU E3 / PC 40) E3 display. Communication malfunction between IPM board and outdoor main board. Is there at least one LED light in the IPM board? Check the signal wire between the IPM board and the main...
Page 55 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.4 Voltage protection (ODU E5) Outdoor unit low AC voltage protection (PC 10) Outdoor unit main control board DC bus high voltage protection (PC 11) Outdoor unit main control board DC bus high voltage protection / 341 MCE error (PC 12) Voltage protection.
Page 56 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.5 E6 (PFC module protection) PFC module protection. Check whether the connecting Connect line between main board and it tightly, check if it is the PFC module (IPM module) normal or not. is connected tightly. Check whether the voltage range of P-N on IPM module is normal? Replace the outdoor main board.
Page 57 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.6 Outdoor fan speed has been out of control or compressor speed has been out of control (ODU E8 / EC 07) Over current failure of outdoor DC fan motor (ODU EC 71) Power off, then restart the unit after 2 minutes.
Page 58 RAC Multisplit Outdoor Units with R32 Refrigerant Index 1: 1. Outdoor DC fan motor (control chip is inside fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range shown in below table, the PCB must have problems and needs to be replaced.
Page 59 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.7 High pressure protection (ODU P1 / PC 30) (for HCKU 1060 Z4) High pressure protection. Check whether the wiring be- tween the high pressure switch Connect it well. and main control board is con- nected well and correctly.
Page 60 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.8 Low pressure protection (ODU P2 / PC 31) (for HCKU 1060 Z4) Low pressure protection. Check whether the wiring be- tween the low pressure switch Connect it well. and main control board is con- nected well and correctly.
Page 61 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.9 Current protection of compressor (ODU P3 / PC 08) Outdoor unit zero speed protection (ODU PC 44) Compressor speed has been out of control (ODU PC 46) Compressor overcurrent failure (ODU PC 49) Current protection of compressor.
Page 62 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.10 Temperature protection of compressor discharge (ODU P4 / PC 06) Temperature protection of compres- sor’s discharge. Check Check whether the compres- Repair leaking and whether the refrigerant sor discharge temp. is more add refrigerant.
Page 63 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.11 High temperature protection of condenser (ODU P5 / PC 0A) When outdoor heat exchanger temperature is more than 65°C, the unit will stop. Unit runs again when outdoor heat exchanger temperature is less than 52°C. Check the connection between temperature...
Page 64 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.12 IPM module protection (ODU P6 / PC 00) IPM module protection. Regulate Check whether the voltage ran- Check it to correct, then ge of P-N on IPM module is nor- whether the input mal (DC 277-356V for 531-810 check whether the power supply is correct?
Page 65 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.13 Top temperature protection of compressor (ODU P0 / PC 02) Check if the air flow system Clear up the air inlet and outlet or the heat of indoor and outdoor units exchanger of indoor and outdoor units. are obstructed? Turn off the power supply and turn it on 10 minutes later.
Page 66 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.14 Lack phase failure of outdoor DC fan motor (EC 72) Power off, then restart the unit 2 The unit operates normally. minutes later. Is it still displaying the error code? Check the wiring of fan motor. Correct the connections.
Page 67 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.15 Outdoor compressor lack phase protection (PC 43) Power off, then restart the unit 2 The unit operates normally. minutes later. Is it still displaying the error code? Check both ends of compressor connecting line.
Page 68 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.16 Outdoor unit IR chip drive failure (PC 45) Power off, then restart the unit 2 minutes later. Replace the inverter module PCB. 10.3.3.17 The cooling operation or heating operation does not operate. Potential causes ●...
Page 69 RAC Multisplit Outdoor Units with R32 Refrigerant 10.3.3.19 Automatic correction of wiring / piping error: Press the “check switch” (SW1) on the outdoor unit PCB board for 5 seconds until LED displays “CE”, which means this function is working. Approximately 5-10 minutes after the switch is pressed, the “CE” indication disappears, the wiring / piping error will be corrected, and wiring / piping is properly connected.
Page 70: Temperature Sensors
RAC Multisplit Outdoor Units with R32 Refrigerant 10.4 Main Parts Check 10.4.1. Temperature sensor checking Disconnect the temperature sensor from PCB, then measure the resistance value with a tester. Tester  Temperature Sensors: • Room temperature (T1) sensor. • Indoor coil temperature (T2) sensor. •...
Page 71: Appendix 1: Temperature Sensor Resistance Value Table For T1, T2, T3, T4, T2B (°C - K)
RAC Multisplit Outdoor Units with R32 Refrigerant  Appendix 1: Temperature Sensor Resistance Value Table for T1, T2, T3, T4, T2B (°C - K) °C k Ω °C k Ω °C k Ω °C k Ω 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249...
Page 72: Appendix 2: Temperature Sensor Resistance Value Table For T5 (°C - K)
RAC Multisplit Outdoor Units with R32 Refrigerant  Appendix 2: Temperature Sensor Resistance Value Table for T5 (°C - K) °C k Ω °C k Ω °C k Ω °C k Ω 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492...
Page 73: Compressor Checking
RAC Multisplit Outdoor Units with R32 Refrigerant 10.4.2 Compressor checking Measure the resistance value of each winding by using the tester. Blue Input Terminal Blue Black Black Compressor Model KSM135D23UFZ KTF235D22UMT KTF310D43UMT Resistance Values Position Blue - Red 1.75Ω (20°C) 0.65Ω...
Page 74 RAC Multisplit Outdoor Units with R32 Refrigerant 10.4.3 IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and U, V, W and N and between U, V, W and N. Normal resistance value Digital tester Digital tester...
Page 75 RAC Multisplit Outdoor Units with R32 Refrigerant 10.4.4 4-way valve 1. Power on, use a digital tester to measure the voltage. When the unit operates in cooling, it is 0V. When the unit operates in heating, it is about 230VAC. If the value of the voltage is not in the range, the PCB must have problems and needs to be replaced.
Page 76 RAC Multisplit Outdoor Units with R32 Refrigerant 10.4.5 EXV check  Disconnect the connectors: 1 White 2 Yellow 3 Orange 4 Blue 5 Brown 6 Red  Measure resistance to EXV coil: Color of lead wire Normal value Red - Blue About 50Ω...
Page 77 RAC Multisplit Outdoor Units with R32 Refrigerant Notes Notes-1...
Page 78 RAC Multisplit Outdoor Units with R32 Refrigerant Notes Notes-2...
Page 79 RAC Multisplit Outdoor Units with R32 Refrigerant Due to on-going technological development of the products by the manufacturer, we reserve the right to vary the technical specifications at any time without notice.

This manual is also suitable for:

Hcku 531 z2 Hcku 601 z3 Hcku 761 z3 Hcku 810 z4 Hcku 1060 z4