Carrier QHC Series Service Manual
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Carrier QHC Series Service Manual

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QHC R32 Inverter Series
Service Manual
R32

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Summary of Contents for Carrier QHC Series

  • Page 1 QHC R32 Inverter Series Service Manual...

  • Page 2: Table Of Contents

    CONTENTS 1. Precaution ..............................1 1.1 Safety Precaution .......................... 1 1.2 Warning ............................1 2 Information servicing ........................... 3 3. Function ................................ 8 4. Dimension ..............................9 4.1 Indoor Unit ............................. 9 4.2 Outdoor Unit ..........................12 5. Refrigerant Cycle Diagram ........................13 6 Installation Details ............................

  • Page 3: Precaution

    cable. There is risk of fire or electric shock. 1. Precaution  Do not install, remove, or reinstall the unit by yourself (customer). 1.1 Safety Precaution There is risk of fire, electric shock, explosion,  To prevent injury to the user or other or injury.
  • Page 4   Do not use the product in a tightly Always check for gas (refrigerant) closed space for a long time. leakage after installation or repair of Oxygen deficiency could occur. product.  When flammable gas leaks, all naked Low refrigerant levels may cause failure of flames shall be removed or extinguished.

  • Page 5: Information Servicing

    Clean the filter every two weeks or more of work being carried out. Work in confined often if necessary. spaces shall be avoided. The area around the A dirty filter reduces the efficiency of the air work space shall be sectioned off. Ensure that conditioner and could cause product the conditions within the area have been malfunction or damage.
  • Page 6 atmosphere. sparking;  8. Checks to the refrigeration equipment that there no live electrical components and Where electrical components being wiring are exposed while charging, recovering changed, they shall be fit for the purpose and to or purging the system; ...
  • Page 7 Replace components only with parts specified (OFN) shall then be purged through the by the manufacturer. Other parts may result system both before and during the brazing in the ignition of refrigerant in the atmosphere process. from a leak. 15. Removal and evacuation 12.
  • Page 8 earthed prior to charging the system with i) Do not exceed the maximum working refrigerant. pressure of the cylinder, even temporarily.  Label the system when charging is complete j) When the cylinders have been filled correctly  (if not already). and the process completed, make sure that ...
  • Page 9 it is in satisfactory working order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt.  The recovered refrigerant shall be returned ...

  • Page 10: Function

    3. Function Model Names of Indoor/Outdoor Units Capacity Indoor units Outdoor units 15C R32 42QHC009D8S 38QHC009D8S 42QHC012D8S 38QHC012D8S Inverter 42QHC018D8S 38QHC018D8S 42QHC024D8S 38QHC024D8S 2 ways of drainage Filter Cold catalyst filter Louver Position Memory Function Super Ionizer(O) Refrigerant Leakage Detect Silver Ico Filter(O) Self-diag.

  • Page 11: Dimension

    4. Dimension 4.1 Indoor Unit Model 42QHC009 42QHC012 42QHC018 42QHC024 1082...
  • Page 12 For 42QHC009D8S， For 42QHC012D8S， For 42QHC018D8S，...
  • Page 13 For 42QHC024D8S，...

  • Page 14: Outdoor Unit

    4.2 Outdoor Unit Mounting Dimension(mm) Outdoor Unit Dimension(mm) Outdoor Unit 38QHC009D8S 38QHC012D8S 38QHC018D8S 38QHC024D8S...

  • Page 15: Refrigerant Cycle Diagram

    5. Refrigerant Cycle Diagram INDOOR OUTDOOR CHECK VALVE LIQUID SIDE (Heating Model only) 2-WAY VALVE T3 Condenser temp. sensor CAPILIARY TUBE HEAT EXCHANGE HEAT (EVAPORATOR) T4 Ambient T1 Room temp. EXCHANGE temp. sensor sensor (CONDENSER) T2 Evaporator temp. sensor GAS SIDE 4-WAY VALVE 3-WAY VALVE Accumulator...

  • Page 16: Installation Details

    6 Installation Details 6.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque inch N.cm N.cm Ф6.35 1500(153kgf.cm) 1600(163kgf.cm) Ф9.52 2500(255kgf.cm) 2600(265kgf.cm) Ф12.7 3500(357kgf.cm) 3600(367kgf.cm) Ф15.9 4500(459kgf.cm) 4700(479kgf.cm) Ф19 6500(663kgf.cm) 6700(683kgf.cm) 6.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Rated current of appliance Nominal cross-sectional area (mm²...

  • Page 17: Pipe Length And The Elevation

    6.3 Pipe length and the elevation The pipe length and refrigerant amount: Pipe size Standard Max. Max. Additional Model length Elevation Length refrigerant Liquid B (m) A (m) (g/m) 3/8’’ 1/4’’ 42QHC009D8S+38QHC009D8S (Ф6.35) 42QHC012D8S+38QHC012D8S (Ф9.52) 1/4’’ 1/2’’ 42QHC018D8S+ 38QHC018D8S (Ф12.7) (Ф6.35) 3/8’’...

  • Page 18: Installation For The First Time

    4) Fully open the handle Lo of the manifold 6.4 Installation for the first time valve. Air and moisture in the refrigerant system have 5) Operate the vacuum pump to evacuate. undesirable effects as below: 6) Make evacuation for 30 minutes and check ●...

  • Page 19: Adding The Refrigerant After Running The System For Many Years

    valve at the bottom of the cylinder. Make the purge the air (be careful of the liquid cylinder bottom up to ensure the liquid charge. refrigerant). 2). Purge the air from the charge hose. 3) Put the charging cylinder onto the electronic Open the valve at the bottom of the cylinder scale and record the weight.

  • Page 20: Re-Installation While The Outdoor Unit Need To Be Repaired

    Open the handle Lo valve of the manifold valve should be pumped 20 minutes more. If the pressure can’t achieve -0.1Mpa after slightly to purge air from the charge hose for 5 seconds and then close it quickly. pumping 50 minutes, please check if there 4).
  • Page 21 gauge needle does not move (approximately 5 the hose. minutes after turning off the vacuum pump). 6). Mounted the valve stem caps and the service 5).Disconnect the charge hose from the vacuum port pump. Use torque wrench to tighten the service port cap 2.

  • Page 22: Operation Characteristics

    7. Operation Characteristics Mode Cooling operation Heating operation Drying operation Temperature Room temperature 17℃~32℃ 0℃~30℃ 10℃~32℃ (62℉~90℉) (32℉~86℉) (50℉~90℉) Outdoor temperature 0℃~50℃ -15℃~30℃ 0℃~50℃ (32℉~122℉) (5℉~86℉) (32℉~122℉) -15℃~50℃ (5℉~122℉) (For the models with low temperature cooling system) CAUTION: 1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into operation and cause the unit to operate abnormally.

  • Page 23: Wiring Diagram

    8. Wiring Diagram 8.1 Indoor Unit 42QHC009D8S, 42QHC012D8S, 42QHC018D8S, 42QHC024D8S...

  • Page 24: Outdoor Unit

    8.2 Outdoor Unit 38QHC009D8S, 38QHC012D8S,...
  • Page 25 38QHC018D8S, 38QHC024D8S,...

  • Page 26: Electronic Function

    9. Electronic function 9.1 Abbreviation T1: Indoor room temperature T2: Coil temperature of evaporator T3: Coil temperature of condenser T4: Outdoor ambient temperature T5: Compressor discharge temperature 9.2 Display function 9.2.1 Icon explanation on indoor display board. Digital display: Displays the temperature settings when the air conditioner is operational. Displays the room temperature in FAN mode.

  • Page 27: Main Protection

    In one second interval. NOTE: A guide on using the infrared remote is not included in this literature package. 9.3 Main Protection 9.3.1 Three minutes delay at restart for compressor Less than 1 minute delay for the 1 time start-up and 3 minutes delay for others. 9.3.2 Temperature protection of compressor top The unit will stop working when the compressor top temp.

  • Page 28: Operation Modes And Functions

    9.4 Operation Modes and Functions 9.4.1 Fan mode ( 1) Outdoor fan and compressor stop. (2) Temperature setting function is disabled, and no setting temperature is displayed. (3) Indoor fan can be set to high/med/low/auto. (4) The louver operates same as in cooling mode. (5) Auto fan: 9.4.2 Cooling Mode 9.4.2.1 Compressor running rules...
  • Page 29 Minimum speed or setting speed. The indoor fan is controlled as below: Setting fan T1-Td ℃(° F) Actual fan speed speed H+(H+=H+G) H（=H） H-（H-=H-G) M+(M+=M+Z) M(M=M) M-(M-=M-Z) L+(L+=L+D) L(L=L) L-(L-=L-D) The auto fan acts as below rules: 9.4.2.4 Condenser temperature protection Decrease Hold Increase...
  • Page 30 9.4.3.2 Outdoor fan running rules The outdoor unit will be run at different fan speed according to T4. For different outdoor units, the fan speeds are different 9.4.3.3 Indoor fan running rules When the compressor is on, the indoor fan can be set to high/med/low/auto/mute. When indoor unit coil temp.
  • Page 31 T1-Td+ΔT 9.4.3.4Defrosting mode AC will enter the defrosting mode according to the value of temp. of T3 and the value range of temp. change of T3 and also the compressor running time. During the defrosting mode, the compressor keep running, indoor and outdoor motor will stop, defrost lamp of the indoor unit will be lighted “...
  • Page 32 T1-Ts Cooling Fan only Heating* Heating*: For cooling only models, they will run at fan speed Indoor fan will run at auto fan of the relevant mode. The louver operates same as in relevant mode. If the machine switches mode between heating and cooling, the compressor will keep stopping for certain time and then choose mode according to T1-Ts.
  • Page 33 9.4.8 Refrigerant Leakage Detection With this new technology, the display area will show “EC” when the outdoor unit detects refrigerant leakage. This function is only available in cooling mode. 9.4.9 Louver Position Memory Function When starting the unit again after shutting down, its louver will restore to the angle originally set by the user, but the precondition is that the angle must be within the allowable range, if it exceeds, it will memorize the maximum angle of the louver.
  • Page 34 faint breeze, which will reduce the noise to the lowest level and create a quiet and comfortable room for you.
  • Page 35 9.4.14 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 36 When the AC enter into the information enquiry status, it will display the code value in the next 25s , the details are as follows. 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.

  • Page 37: Troubleshooting

    10. 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 38: Indoor Unit Error Display

    10.1 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 ☆ 4 times Indoor fan speed has been out of control Indoor room temperature sensor T1 open circuit or short ☆...

  • Page 39: Trouble Shooting

    10.2 Trouble shooting 10.2.1 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: Power off, then restart the unit 2 minutes later.
  • Page 40 10.2.2 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 seconds and this condition happens four times continuously. Supposed causes Wiring mistake ● Indoor or outdoor PCB faulty ●...
  • Page 41 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 is moving alternately as positive values and negative values...
  • Page 42 10.2.4 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 43 Index1: 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 44 10.2.4 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 ＜Tcool－2℃ does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...
  • Page 45 10.2.5 Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3) 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 46 10.2.6 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 47 10.2.7 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 is abnormal, the display LED will show “P0” and AC will turn off. conditions Supposed causes Wiring mistake ●...
  • Page 48  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 49 10.2.8 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 50 10.2.9 High temperature protection of IPM module diagnosis and solution (P2) Error Code Malfunction decision If the temperature of IPM module is higher than limited value, the conditions LED will display the failure. Supposed causes IPM radiator problem ● PCB faulty ●...
  • Page 51 10.2.10 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 52 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.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 53 Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4 (° C--K) ° C ° F ° C ° F ° C ° F ° C ° F K Ohm K Ohm K Ohm K Ohm 115.266 12.6431 2.35774 0.62973 109.146 12.0561 2.27249 0.61148...
  • Page 54 Appendix 2 Temperature Sensor Resistance Value Table for T5 (° C --K) ° C ° F ° C ° F ° C ° F ° C ° F K Ohm K Ohm K Ohm K Ohm 542.7 69.66 13.59 3.702 511.9 65.62 13.11...
  • Page 55 2.Compressor checking Measure the resistance value of each winding by using the tester. Position Resistance Value KSN98D22UFZ KSM135D23UFZ KTF235D22UMT Blue - Blue - 1.57Ω 1.72Ω 0.75Ω Black (20℃/68℉) (20℃/68℉) (20℃/68℉) Red - Blue...

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