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Carrier 42QTD012DS Service Manual
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Carrier 42QTD012DS Service Manual

12 18 24k light commercial
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SERVICE MANUAL
12 18 24K
LIGHT COMMERCIAL

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Summary of Contents for Carrier 42QTD012DS

  • Page 1 SERVICE MANUAL 12 18 24K LIGHT COMMERCIAL...
  • Page 2 Cassette indoor unit 42QTD012DS 12 18K 42QTD018DS 42QTD024DS Under-ceiling indoor unit 42QZL018DS 42QZL024DS Ducted indoor unit 42QSM012DS 42QSM018DS 42QSM024DS Universal outdoor unit 38QUS012DS 38QUS018DS 38QUS024DS...
  • Page 3 INDEX PART1 GENERAL INFORMATION PART1.1 DUCTED PART1.2 CASSETTE PART1.3 UNDERCEILING PART1.4 OUTDOOR UNIT PART2 ELECTRICAL DIAGRAM PART3 TROUBLE SHOOTING...

  • Page 4: General Information

    PART – 1 GENERAL INFORMATION Part 1.1 DUCTED Part 1.2 CASSETTE Part 1.3 UNDER-CEILING Part 1.4 OUTDOOR UNIT...
  • Page 5 PRODUCT LINEUP...
  • Page 6 UNIT MODEL INDENTIFICATION...
  • Page 7 PART – 1 GENERAL INFORMATION 1.1 DUCT...
  • Page 8 DIMENSIONS air inlet from rear side Air filter ( optional ) 4-install hanger Liquid side 25 Drain pipe Gas side 25 Drain pipe Test mouth & Test cover 25 Drain connecting pipe ( for pump ) Fresh air intake Electric control box Air filter ( optional ) air inlet from bottom side Note: standard product without filter...
  • Page 9 INSTALLTION SPACE...

  • Page 10: Static Pressure

    STATIC PRESSURE...
  • Page 11 STATIC PRESSURE - 42QSM012DS...
  • Page 12 STATIC PRESSURE - 42QSM018DS...
  • Page 13 STATIC PRESSURE - 42QSM024DS...

  • Page 14: Disassembly Instruction

    DISASSEMBLY INSTRUCTION Parts name Procedures Remarks Remove the 1) Screw off the screws to electronic remove the cover of control box electronic control box Four screws 2) Disconnect the fan motor Plug of room temperate sensor wire, fan capacity wire, and evaporator room temperature sensor temperature sensor...
  • Page 15 Remove the 1) Remove the cover of Repeat the operation of step1 of No1 electronic control box Pull out all the plugs or connectors connected to the PCB and remove the ground wire after remove the screw. 2) Remove the PCB from the electronic control Press the four fixing holders...
  • Page 16 2) Screw off the fixing screws to remove the Rear beam rear beam Total four screws at the left side and right side 3) Remove room Cut off the fastening temperature sensor belt to take off the room temperature sensor 4) Remove the sticker Stickers 5) Remove the below volute...
  • Page 17 3 screws 3 screws 3 screws Water collector assembly Remove the 1) Remove the water Repeat the operation of No.6 evaporator collector 2) Remove the evaporator sensor Evaporator sensor 3) Remove the pipe clamp board 2 screws 4) Remove the evaporator support board 4 screws...
  • Page 18 5) Screw off the fixing screws to remove the evaporator 1 screw...
  • Page 19 PART – 1 GENERAL INFORMATION 1.2 CASEETTE...
  • Page 20 DIMENSIONS – 12 18K Liquid side Gas side Body Drain hole Wiring connection port ( for Service ) E-parts box 150 Distribution duct 4-Screw hole (for install panel) 4-install hanger Drain pipe Fresh air intake Wiring connection port Panel...
  • Page 21 DIMENSIONS – 24K 92 92 Fresh air intake 4-install hanger Body Gas side Liquid side Wiring connection port E-parts box Service hole for Test mouth & Test cover draining pump Drain hole 92 92 92 92 Panel Unit: mm Model 42QTD024DS*...
  • Page 22 INSTALLTION SPACE...
  • Page 23 DISASSEMBLY INSTRUCTION Parts name Procedures Remarks Remove the 1) Open the grille filter Grill switch 2) Remove the filter Note: the filter is easy to be damaged, be careful when removing it. Remove the 1) Open the grille Repeat the operation of step1 of No.1 panel 2) Remove the grille ...
  • Page 24 board 3) Disassemble the display board  Remove the display 4 screws board cover(4 screws)  Remove the display board(4 screws) 4 screws Remove the 1) Remove the panel Repeat the operation of step1,2,3 of No.2 swing 2) Screw off 3 screws to motor remove the swing motor assy.
  • Page 25 3) Pull Indoor fan Pump connection wires to other Water lever Temp. sensors parts, then the PCB can be replaced. Swing motor Power Input Display board 4) There buckles fixing the PCB. To draw out the PCB, you should open them. Remove the 1) Open the grille Repeat the operation of step1 of No.1(No need...
  • Page 26 3) Remove the fixing nut to disassemble the fan wheel 4) Pull out the fan wheel Remove the 1) Repeat the operation of fan motor No.6 2) Remove the fixing board of fan motor wire 3 nuts 3) Remove the 5 screws to disassemble motor 5 screws...
  • Page 27 assembly 3) Screw off the 4 screws inside 4 holes (1 is under a protection cover) to remove water collecting assembly. 4) Take water collecting assembly Remove the 1) Remove the panel Repeat the operation of No.2 draining 2) Remove the electronic Repeat the operation of No.6 pump control box...
  • Page 28 6) There are 2 screws under the supporter to fixing the pump. Release them to take the pump out of the supporter. Remove the 1) Remove water Repeat the operation of No.9 evaporator collecting assembly 2) Remove the seal board of evaporator 3 screws 3) Remove the evaporator...
  • Page 29 PART – 1 GENERAL INFORMATION 1.3 UNDER-CEILING...
  • Page 30 DIMENSIONS Wiring connection port Drain discharge port Fresh air intake Refrigerant pipe hole Hanging arm M0del 42QZL018/24DS* 1068...
  • Page 31 INSTALLTION SPACE...
  • Page 32 DISASSEMBLY INSTRUCTION Parts name Procedures Remarks Remove the 1) Pull the grille locker till outlet the screws appears, and grilles. release these screws. 2) Remove the air return grille (watch the lockers under the grilles). Remove the 1) Release 2 screws fixing control the control box, and then take it out.
  • Page 33 Fan Capacitor Main PCB Transformer Power cord terminal 3) Disconnect the fan motor wire, louver motor wire, room temperature and evaporator temperature wire, and display board wire remove electronic control box 4) Disconnect all the wires Input/output Power input Indoor fan control of plugs connected to the transformer Control wires for...
  • Page 34 2) Remove the below volute shell Press Press the clips to take off the volute shell 3) Disassemble the fan The fan motor assembly and motor fixing clamps to fan wheel assembly can be removed after took off the remove the fan motor 2screws used to fix the fan assembly and fan wheel motor fixing clamps.
  • Page 35 Remove the 1) Release the 2 screws Release the screw display (both sides) and push the panel upwards to remove Push it upwards 2) Release 11 screws (5 at the front and 6 at both sides). 3) Remove the front panel. The display board is on the back.
  • Page 36 2) Remove the air outlet grille assembly screwing of 8 screws release 8 screws 3) Release 2 screws fixing swing motor remove it Remove 1) Remove motor horizontal protective cover swing motors (on both sides 2) Screw off the 2 fixing off the unit) screws to remove swing motor...
  • Page 37 PART – 1 GENERAL INFORMATION 1.4 OUTDOOR UNIT...
  • Page 38 DIMENSIONS Model 38QUS012/18DS* 38QUS024DS*...
  • Page 39 INSTALLTION SPACE (Wall or obstacle) More than 30cm Air inlet More than 60cm More than 30cm Maintain channel Air inlet More than 60cm Air outlet More than 200cm...
  • Page 40 REFRIGENRANT 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 41 DISASSEMBLY INSTRUCTION Part name Procedures Remarks Panel plate How to remove the panel plate. Top cover Stop operation of the air conditioner and turn “OFF” the power breaker. Remove the top cover. (7 screws) Remove the front panel. (8 Front panel screws) Fan ass’y How to remove the fan ass’y.
  • Page 42 release the fan motor connector. ③ 4) Remove the four fixing screws. ④ Remove the fan motor. Electrical How to remove the electrical parts parts. 1) Perform work of item 1,2. 2) Remove the two fixing screws of wiring cover and the two fixing screws of wiring board.
  • Page 43 ③ Remove the wires connected with the reactor. ④ Remove the grounding wire. ⑤ Remove the two screws fixing the electronic control box. ⑥ Then remove the electrical parts. Compressor How to remove thecompressor. 1) Perform work of item1,2,3 ② 2) Remove the discharge pipe and suction pipe with a burner.
  • Page 44 compressor on bottom plate. ③ Lift the compressor from the base pan assembly.

  • Page 45: Electrical Diagram

    PART – 2 ELECTRICAL DIAGRAM...
  • Page 46 WIRING DIAGRAM - 42QSM012/18/24DS*...
  • Page 47 WIRING DIAGRAM - 42QTD012/18DS*...
  • Page 48 WIRING DIAGRAM - 42QTD024DS*...
  • Page 49 WIRING DIAGRAM - 42QZL018/24DS*...
  • Page 50 WIRING DIAGRAM – 38QUS012DS*...
  • Page 51 WIRING DIAGRAM – 38QUS018DS*...
  • Page 52 WIRING DIAGRAM – 38QUS024DS*...

  • Page 53: Troubleshooting

    PART – 3 TROUBLE SHOOTING...

  • Page 54: Safety Caution

    SAFETY CAUTION 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!) 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 55: Error Code

    ERROR CODE Abbreviation T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger middle. T3: Coil temperature of outdoor heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperature...
  • Page 56 Indoor Unit Operation Timer Digital Led Status Remark lamp lamp Display ☆ 1 time Indoor unit EEPROM parameter error ☆ 2 times Indoor / outdoor units communication error ☆ 3 times Zero crossing signal detection error Only available for AC motor of high-wall Indoor fan speed has been out of control ☆...
  • Page 57 Trouble Shooting of Indoor Error Code 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 from conditions EEPROM chip. Supposed causes Installation mistake ● PCB faulty ●...
  • Page 58 2 Indoor unit and outdoor unit communication protection error diagnosis and solution (E1) Error Code Malfunction decision Indoor unit does not receive the feedback from outdoor unit during 110 conditions seconds and this condition happens four times continuously. Supposed causes Wiring mistake ●...
  • Page 59 3 Zero crossing detection error diagnosis and solution (E2) Power off, then restart the unit 2 minutes later Indoor main PCB is defective. Replace indoor main PCB. Only available for AC motor of high-wall.
  • Page 60 4 Fan speed has been out of control diagnosis and solution (E3/F5) E3/F5 Error Code Malfunction decision When indoor fan speed keeps too low (300RPM) for certain time, the unit conditions will stop and the LED will display the failure. Supposed causes Wiring mistake ●...
  • Page 61 5 Open circuit or short circuit of temperature sensor diagnosis and solution (E4/E5/F1/F2/F3) Error Code E4/E5/F1/F2/F3 Malfunction decision If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED conditions will display the failure. Supposed causes Wiring mistake ●...
  • Page 62 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 ＜Tcool－2℃ does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...
  • Page 63 7 Water-level alarm malfunction diagnosis and solution Error Code Malfunction decision conditions If the sampling voltage is not 5V, the LED will display the failure. ● Wiring mistake Supposed causes ● Water-level switch faulty ● Water pump faulty ● Indoor PCB faulty Power off, then restart the unit 3 minutes Power off, then restart the unit 3 minutes later.
  • Page 64 8 Operation current protection (F0) Current protection of compressor Judge 1: Check whether the input current of the power supply wire is higher than max protection current value Check whether the refrigerant system is ok Judge 2: Check whether the outdoor ambient Stop the unit temperature is higher than...
  • Page 65 9 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 66 10 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 67 11 High temperature protection of compressor top diagnosis and solution (P2) Error Code Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Power supply problems. ● System leakage or block ● PCB faulty ●...
  • Page 68 12 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 69 APPENDIX 1 Temperature Sensor Resistance Value Table, B=4100K K Ohm K Ohm K Ohm K Ohm ℃ ℃ ℃ ℃ 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5000 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865 10.4736 2.03732 0.56038 84.2190 10.000 1.96532...
  • Page 70 APPENDIX 2 Compressor Discharge Temperature Sensor Resistance Value Table, B=3950K K Ohm K Ohm K Ohm K Ohm ℃ ℃ ℃ ℃ 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 57.37 11.79 3.296 406.7 54.89...

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