ComfortStar CXH09CD Service Manual
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ComfortStar CXH09CD Service Manual

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Revision A: 170816, Content updated.
Model Numbers:
CXH09CD CXH12CD
CXH24CD
CXH18CD

Table of Contents

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FoR HI-HEAt SERIES(CXH)
SERVICE MANUAL

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February 4, 2025

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Summary of Contents for ComfortStar CXH09CD

  • Page 1: Table Of Contents

    FoR HI-HEAt SERIES(CXH) SERVICE MANUAL Revision A: 170816, Content updated. Model Numbers: CXH09CD CXH12CD CXH24CD CXH18CD Table of Contents Precaution Part Names And Functions Dimension Refrigerant Cycle Diagram Wiring Diagram Installation Details Operation Characteristics Electronic Function Troubleshooting 10. Disassembly Instructions...
  • Page 2 CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution ........................... 1 1.2 Warning ............................1 2. Part Names And Functions ..........................4 2.1 Model Names of Indoor/Outdoor units ................... 4 2.2 Part names of Indoor/Outdoor units ....................5 3. Dimension ..............................6 3.1 Indoor Unit ............................6 3.2 Outdoor Unit ...........................

  • Page 3: Precaution

    Sharp edges could cause injury, be especially careful of the case edges and the fins on the 1. Precaution condenser and evaporator. For installation, always contact the  1.1 Safety Precaution dealer or an authorized service center. To prevent injury to the user or other Do not install the product on a ...
  • Page 4 product. There is risk of electric shock or fire. Stop operation and close the window It can avoid vibration of water leakage.  in storm or hurricane. If possible, remove Do not install the product where the  the product from the window before the noise or hot air from the outdoor unit could hurricane arrives.
  • Page 5 Use a firm stool or ladder when  cleaning or maintaining the product. Be careful and avoid personal injury. Replace the all batteries in the remote  control with new ones of the same type. Do not mix old and new batteries or different types of batteries.

  • Page 6: Part Names And Functions

    2. Part Names And Functions 2.1 Model Names of Indoor/Outdoor units Outdoor units Series Capacity Indoor units CXH09CD(O) CXH09CD(I) CXH12CD(I) CXH12CD(O) CXH18CD(I) CXH18CD(O) CXH24CD(I) CXH24CD(O)

  • Page 7: Part Names Of Indoor/Outdoor Units

    2.2 Part names of Indoor/Outdoor units...

  • Page 8: Dimension

    3. Dimension 3.1 Indoor Unit Model CXH09CD 835mm 198mm 280mm CXH12CD (32.9in) (7.8in) (11.0in) 990mm 218mm 315mm CXH18CD (39.0in) (8.6in) (12.4in) 1186mm 258mm 343mm CXH24CD (46.7in) (10.2in) (13.5in)
  • Page 9 For CXH09CD, CXH12CD, For CXH18CD , For CXH24CD ,...

  • Page 10: Outdoor Unit

    More than 70cm(27.6in) Note: The above drawing is only for reference. The appearance of your units may be different. Model W in(mm) D in(mm) H in(mm) W1 in(mm) A in(mm) B in(mm) CXH09CD 31.5(800) 13.11(333) 21.81(554) 34.25(870) 20.24(514) 13.39(340) CXH12CD(O) CXH18CD(O) 33.27(845)

  • Page 11: Refrigerant Cycle Diagram

    4. Refrigerant Cycle Diagram IN D O O R O U T D O O R E le c tro n ic C A P IL L A R Y e x p a n s io n va lve L IQ U ID S ID E tu b e 2 -W A Y V A L V E...

  • Page 12: Wiring Diagram

    6.2 Connecting the cables The power cord should be selected according to the following specifications sheet. Appliance Amps AWG Wire Size 7.5m 15g/m CXH09CD+ CXH09CD CXH12CD+ CXH12CD(O) (24.6ft) (32.8ft) (82.0ft) (0.16oz/ft) The cable size and the current of the fuse or...

  • Page 13: Installation For The First Time

    6.4 Installation for the first time 5) Operate the vacuum pump to evacuate. 6) Make evacuation for 30 minutes and check Air and moisture in the refrigerant system have whether the compound meter indicates undesirable effects as below: -0.1Mpa(14.5Psi). If the meter does not indicate -0.1Mpa(14.5Psi) after pumping 30 ●...

  • Page 14: Re-Installation While The Indoor Unit Need To Be Repaired

    and press the check valve on the charge set to Open the handle Lo valve of the manifold valve purge the air (be careful of the liquid slightly to purge air from the charge hose for 5 refrigerant). seconds and then close it quickly. 3) Put the charging cylinder onto the electronic 4).
  • Page 15 pumping 50 minutes, please check if there are some leakage points. Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump). 7)Turn the flare nut of the 3-way valves about 45°...

  • Page 16: Operation Characteristics

    °C °C °C Outdoor temperature ～50 ～30 ～50 °F °F °F °F °F °F (-13 ～122 (-13 ～86 ～122 Outdoor temperature CXH09CD, °C °C °C °C °C °C ～50 ～30 ～50 CXH12CD, °F °F °F °F °F °F (-22 ～122 (-22 ～86...

  • Page 17: Electronic Function

    8. Electronic Function 8.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature TP: Compressor discharge temperature 8.2 Display function 8.2.1 Icon explanation on indoor display board. ION indication lamp(optional function)：This lamp illuminates when Clean Air feature is activated.

  • Page 18: Main Protection

    function. 8.3 Main Protection 8.3.7 Compressor preheating functions 8.3.1 Three minutes delay at restart for Preheating permitting condition: compressor When T4(outdoor ambient temperature)＜ Less than 1 minute delay for the 1 time 3°C(37.4°F), the preheating function will be stand-up and 3 minutes delay for others. activate 8.3.2 Temperature protection of compressor 8.3.8 Zero crossing detection error...

  • Page 19: Operation Modes And Functions

    8.4 Operation Modes and Functions and the speed can be selected as high, medium, low and auto. 8.4.1 Fan mode When the setting temp. is reached, if the (1) Outdoor fan and compressor stop. compressor stop running, indoor fan motor will (2) Temperature setting function is disabled, run in Minimum speed or setting speed.
  • Page 20 When the AC run in mute mode, the T 1 - T d + Δ T compressor will run with low frequency. When the current is more than setting value, the current protection function will be activated and the compressor will stop. 8.4.3.2 Outdoor fan running rules The outdoor unit will be run at different fan speed according to T4.
  • Page 21 operation mode, pressing touch button will turn T1-Ts off the machine. Cooling 8.4.6.2 In forced operation mode, all general protections and remote control are available. 8.4.6.3 Operation rules: Fan only Forced cooling mode: The compressor runs at F2 frequency and Heating* indoor fan runs as breeze.
  • Page 22 8.4.10 Point check function Press the LED DISPLAY or LED or MUTE button of the remote controller three times, and then press the AIR DIRECTION or SWING button three times in ten seconds, the buzzer will keep ring for two seconds.
  • Page 23 Enquiry Display value Meaning Remark information T1,T2,T3,T4, -1F,-1E,-1d,-1c,- -25,-24,-23,-22,-21,-2 1. All the displaying temperature is actual T2B,TP,TH, 1b,-1A value. Targeted 2. All the temperature is °C no matter what -19—99 -19—99 Frequency, kind of remote controller is used. A0,A1,…A9 100,101,…109 Actual 3.

  • Page 24: Troubleshooting

    9. Troubleshooting Safety Electricity power is still kept in capacitors even the power supply is shut off. Do not forget to discharge the electricity power in capacitor. Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) For other models, please connect discharge resistance (approx.100Ω 40W) or soldering iron (plug) between +, - terminals of the electrolytic capacitor on the contrary side of the outdoor PCB.

  • Page 25: Indoor Unit Error Display

    9.1 Indoor Unit Error Display Operation Timer lamp Display LED STATUS lamp ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆ 3 times Zero-crossing signal detection error ☆ 4 times Indoor fan speed has been out of control Indoor room temperature sensor T1 open circuit or short ☆...

  • Page 26: Outdoor Unit Error Display

    9.2 Outdoor unit error display CXH18CD(O) For CXH09CD, CXH12CD(O), 290-330VDC standby connect to the DR module 210-300VDC running bridge connect to reactance connect to earth fuse 250V 30A [V1.8] 2015-01-16 CN22 C N6 R1 41 CN6-1 PTC1 D SA1 R1 54...
  • Page 27 For others connect to PFC Capacitor when is on, 100-130V AC output connect to reactor when is on, 100-130V AC output US-KFR-35W/BP3N1-(115V+RX62T+41560).D.13.WP2-1 CN4_1CN4_2 CN4_3CN4_4 connect to Ground bridge REACTOR connect to N-line DSA1 (100-130VAC INPUT) connect to L-line (100-130VAC INPUT) CN16 connect to indoor unit T20A/ 25 0V AC...
  • Page 28 For CXH24CD(O) Connect to the Indoor evap.pipe out temp. sensor T2B-A、T2B-B、T2B-C、T2B-D、T2B-E external drive DC fan 6 5 4 3 2 1 motor connector Electric Expansion Electric Expansion testPort Electric Expansion Electric Expansion Electric Expansion external drive DC fan external drive DC fan Value C Value E communication...
  • Page 29 IPM board, connect to DC fan motor TO MAIN 0VAC (standby) CN19 CN55 10-200VAC (running) EU-KFR105W/BP2T3N1-350(767).D.13.MP2-1 202302141237 IPM2 CN57 Debug connect to the compressor 0VAC (standby) 10-200VAC (running) CAPACITOR Voltage IPM1 290-330VDC (standby) 210-300VDC (Running) CN54 L-IN2 EARTH PFC-L1 [1.6]2014.10.16 CN58 CN53 CN54...

  • Page 30: Diagnosis And Solution

    9.3 Diagnosis and Solution 9.3.1 EEPROM parameter error diagnosis and solution(E0/F4) E0/F4 Error Code Malfunction decision Indoor or outdoor PCB main chip does not receive feedback conditions from EEPROM chip. Supposed causes Installation mistake ● PCB faulty ● Trouble shooting: EEPROM: a read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.
  • Page 31 9.3.2 Indoor / outdoor unit’s communication diagnosis and solution(E1) Error Code Malfunction decision Indoor unit does not receive the feedback from outdoor unit during conditions 110 seconds and this condition happens four times continuously. Supposed causes Wiring mistake ● Indoor or outdoor PCB faulty ●...
  • Page 32 Remark: Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port. When AC is normal running, the voltage will move alternately between -25V to 25V.
  • Page 33 9.3.3 Zero crossing detection error diagnosis and solution (E2) Error Code Malfunction decision When PCB does not receive zero crossing signal feedback for 4 conditions minutes or the zero crossing signal time interval is abnormal. Supposed causes Connection mistake ● PCB faulty ●...
  • Page 34 9.3.4 Fan speed has been out of control diagnosis and solution(E3) E3/F5 Error Code Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, conditions the unit will stop and the LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 35 Index 1: 1:Indoor or Outdoor DC Fan Motor(control chip is in 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 showing in below table, the PCB must has problems and need to be replaced.
  • Page 36 9.3.5 Open circuit or short circuit of temperature sensor diagnosis and solution(E5) E4/E5/F1/F2/F3 Error Code Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, conditions the LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 37 9.3.6 Refrigerant Leakage Detection diagnosis and solution(EC) Error Code Malfunction decision Define the evaporator coil temp.T2 of the compressor just starts conditions running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2 °C( Tcool－35.6 °F) does not keep continuous 4 ＜Tcool－2 seconds and this situation happens 3 times, the display area will show “EC”...
  • Page 38 9.3.6 Overload current protection diagnosis and solution(F0) Error Code Malfunction decision An abnormal current rise is detected by checking the specified conditions current detection circuit. Supposed causes Power supply problems. ● System blockage ● PCB faulty ● Wiring mistake ● Compressor malfunction ●...
  • Page 39 9.3.7 IPM malfunction or IGBT over-strong current protection diagnosis and solution(P0) Error Code Malfunction decision When the voltage signal that IPM send to compressor drive chip conditions is abnormal, the display LED will show “P0” and AC will turn off. Supposed causes Wiring mistake ●...
  • Page 40 For example: Note: The photos below are only for reference, it’s may be not same totally with the ones on your side.
  • Page 43 For 24K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below:...
  • Page 44 9.3.8 Over voltage or too low voltage protection diagnosis and solution(P1) Error Code Malfunction decision An abnormal voltage rise or drop is detected by checking the conditions specified voltage detection circuit. Supposed causes Power supply problems. ● System leakage or block ●...
  • Page 45 9.3.9 High temperature protection of IPM module diagnosis and solution(P2) Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes PCB faulty ● Trouble shooting:...
  • Page 46 9.3.10 Inverter compressor drive error diagnosis and solution(P4) Error Code Malfunction decision An abnormal inverter compressor drive is detected by a special conditions detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Supposed causes Wiring mistake ●...
  • Page 47 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 UVWN; UVW and N. Digital tester Normal resistance value Digital tester Normal resistance value (+)Red (-)Black...
  • Page 48 For 24K~36K: At first test the resistance between every two ports of U, V, W of IPM and P, N. If any result of them is 0 or close to 0, the IPM is defective. Otherwise, please follow the procedure below:...
  • Page 49 9.3.11 Low pressure protection diagnosis and solution(P6) Error Code Malfunction decision When the pressure of system reach a certain value, the low conditions pressure protector will switch off. After the pressure resume to normal ,the protection code will disappear. Supposed causes Wiring mistake ●...
  • Page 50 Main parts check 1. Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(TP) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 51 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (°C--K) K Ohm K Ohm K Ohm K Ohm °C °F °C °F °C °F °C °F 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865...
  • Page 52 Appendix 2 Temperature Sensor Resistance Value Table for TP (°C --K) K Ohm K Ohm K Ohm K Ohm °C °F °C °F °C °F °C °F 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5...
  • Page 53 Appendix 3: °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 129.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8 188.6 244.4 32.9 78.8 134.6 190.4 246.2 33.8...
  • Page 54 Appendix 4 Normal voltage of P and N 208-240V(1-phase,3-phase) 380-420V(3-phase) In standby around 310VDC around 530VDC In operation With partial With fully With passive active PFC active PFC PFC module module module >200VDC >310VDC >370VDC >450VDC...
  • Page 55 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value ASM98D32UFZ ATM115D43UFZ2 ATM150D23UFZ ATF235D22UMT ATF250D22UMT Blue – 2.25Ω 1.87Ω 1.72Ω 0.75Ω 0.75Ω Blue - (20°C (20°C (20°C (20°C (20°C Black /68°F) /68°F) /68°F) /68°F) /68°F) Red –...
  • Page 56 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 UVWN; UVW and N. Digital tester Normal resistance value Digital tester Normal resistance value (+)Red...
  • Page 57 5: Pressure On Service Port Cooling chart: °F ° (23.89) (29.44) (35) (40.56) (46.11) 70/59 10.1 75/63 10.7 80/67 11.2 °F ° (23.89) (29.44) (35) (40.56) (46.11) 70/59 75/63 80/67 °F ° (23.89) (29.44) (35) (40.56) (46.11) 70/59 0.82 0.78 0.81 0.86 1.01...
  • Page 58 Heating Chart: 57/53 47/43 37/33 27/23 17/13 °F (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) (-8.33/-10.56) °C 30.3 28.5 25.3 22.8 20.8 32.5 30.0 26.6 25.4 23.3 33.8 31.5 27.8 26.3 24.9 57/53 47/43 37/33 27/23 17/13 °F (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) (-8.33/-10.56) °C 57/53 47/43...

  • Page 59: Disassembly Instructions

    10 Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine. 10.1 Indoor unit Parts name Procedures Remarks Front panel How to remove the front Overview: panel. One screw Panel Pull the below side of fixing the cover the panel and release the clips.
  • Page 60 Electrical How to remove the Room temp. parts electrical parts. sensor Grounding screws After remove the front panel from Swing motor procedure 1, pull out the room temp. sensor and evaporator coil sensor. Remove the grounding screws. Pull out the clip toward the left side and open the cover.
  • Page 61 Evaporator remove evaporator. 1) After remove the front panel ass’ y and electrical parts following procedure 1 and procedure 2, remove the pipe holder at the rear side of the unit. 2) Remove the two screws on the evaporator at the base bearing side. 3) Remove two screws on the evaporator at the fixed plates and then...
  • Page 62 Fan and How to remove the fan motor and motor. After remove the evaporator ass’y following procedure 1, procedure 2 and procedure 3, remove the three screws fixing the cover Remove the screw fixing the motor and then pull out the motor. Three screws One screw...

  • Page 63: Outdoor Unit

    10.2 Outdoor unit MOB30-09HFN1-BW0W, CXH09CD, MOB30-12HFN1-BV0W, CXH12CD(O) Part name Procedures Remarks Panel plate How to remove the panel plate. Screws of top panel (3 screws, 1 screw is under the big handler) 1) Stop operation of the air conditioner and 3 screws turn “OFF”...
  • Page 64 Fan ass’y ○ How to remove the fan ass’y. 1) After remove the panel plate following procedure 1, remove the hex nut fixing the fan and then remove ○ the fan. 2) Unfix the hooks and compressor T3,T4,T5 sensor then open the electronic control box cover.
  • Page 65 3) Disconnect the ○ connector for fan motor from the electronic control board. ○ 4) Remove the four fixing screws of the fan motor. Then remove the fan motor. Electrical How to remove the parts ○ electrical parts. 1) After finish work of item 1 and item 2, remove the connectors for the compressor.
  • Page 66 ○ 3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp. sensor(T4) and discharge temp. sensor(TP). 4) disconnect the ○ electronic expansion valve wire 5) Remove the ○ ○ grounding screw. 6) Remove the Wires (1,2,3). Then remove the electronic control box.
  • Page 67 Four-way How to remove the valve The picture of four-way valve may be different from four-way valve. the one on your side. ○ ○ 1) Perform work of item1,3. 2) Recover refrigerant from the refrigerant circuit. 3) Remove the screw of the coil and then remove the coil.
  • Page 68 CXH18CD(O), Part name Procedures Remarks Panel plate How to remove the panel plate. 1) Stop operation of 3 screws of top panel the air conditioner and turn “OFF” the power 3 screws of breaker. big handle 2) Remove the top panel(3 screws).
  • Page 69 Fan ass’y How to remove the fan ass’y. ○ 1) After remove the panel plate following procedure 1, remove the hex nut fixing the fan and then remove the fan. ○ 2) After remove the top cover . Unfix the hooks and then open the electronic control box cover.
  • Page 70 3) Disconnect the ○ connector for fan motor from the electronic control board. 4) Remove the four fixing ○ screws of the fan motor. Then remove the fan motor. Electrical How to remove the parts ○ electrical parts. 1) After finish work of item 1 and item 2, remove the connectors for the compressor and reactor.
  • Page 71 ○ 2) Pull out the two blue ○ wires connected with the four way valve. ○ ○ 3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp. sensor(T4) and discharge temp. sensor(TP). ○ 4) disconnect the electronic expansion valve wire...
  • Page 72 5) remove the electric ○ heaters. 6) Remove the grounding screw. 7) Remove the Wires (1,2,3 or L1,L2,S).Then remove the electronic control box. ⑥ ○...
  • Page 73 Four-way How to remove the valve The picture of four-way valve may be different from four-way valve. the one on your side. 1) Perform work of ④ ○ item1,3. 2) Recover refrigerant from the refrigerant circuit. 3) Remove the screw of the coil and then remove the coil.
  • Page 74 CXH24CD(O), MOD30-30HFN1-MR0W, MOD30-36HFN1-MP0W, Part name Procedures Remarks Panel plate How to remove the panel 4 screws of big handle plate. Screws of top panel(3screws,1screws is under the big handle) 1) Stop operation of the air conditioner and turn “OFF” the power breaker. 2) Remove the big handle Screws of front panel(11 screws) first,then remove the top...
  • Page 75 Fan ass’y How to remove the fan ass’y. Electronic control box 1) After remove the panel plate following procedure 1 2) Remove the nut fixing the fan,and remove the fan. compressor ○ 3) Unfix the hooks and remove the screws, then open the electronic control ○...
  • Page 76 Compressor T3,T4,T5,sensor Pressure switch wire ○ Motor wire Electronic expansion 4 way valve 4) Disconnect the ○ connector for fan motor from the electronic control board. 5) Remove the four fixing screws of the fan motor, then remove the motor. ○...
  • Page 77 Electrical How to remove the parts ○ electrical parts. 1) After finish work of item 1 and item 2, remove the connector for the compressor ○ 2) Pull out the two blue wires connected with the four way valve. 3) Pull out connectors of ○...
  • Page 78 4)Disconnect the pressure ○ switch connector. 5) Disconnect the electronic expansion valve ○ wire from the control board ○ ○ 6) Remove the ground wires . 7) Remove the wires(1,2,3 or L1,L2,S). Then remove the electronic control box.
  • Page 79 Four-way How to remove the valve The picture of four-way valve may be different from four-way valve. the one on your side. 1) Perform work of item 1,3. 2) Recover refrigerant from the refrigerant circuit. 3) Remove the screw of the coil and then remove the coil.
  • Page 80 Wiring Diagram 9k,12k indoor and outdoor unit...

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