Carrier 38QUS012DS Service Manual Download

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SERVICE MANUAL

12 18 24K

LIGHT COMMERCIAL

Summary of Contents for 38QUS012DS

Page 1: ...SERVICE MANUAL 12 18 24K LIGHT COMMERCIAL ...

Page 2: ...indoor unit 12 18K 24K 42QTD012DS 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: ...PART 1 GENERAL INFORMATION Part 1 1 DUCTED Part 1 2 CASSETTE Part 1 3 UNDER CEILING Part 1 4 OUTDOOR UNIT ...

Page 5: ...2 PRODUCT LINEUP ...

Page 6: ...3 UNIT MODEL INDENTIFICATION ...

Page 7: ...PART 1 GENERAL INFORMATION 1 1 DUCT ...

Page 8: ... Drain pipe 25 Drain pipe Note standard product without filter Unit mm Model Outline dimension mm Air outlet opening size Air return opening size Size of install hanger Size of refrigerant pipe A B C D E F G H I J K L M H1 H2 W1 W2 42QSM012DS 700 210 635 570 65 493 35 119 595 200 80 740 350 120 143 95 150 42QSM018DS 920 210 635 570 65 713 35 119 815 200 80 960 350 120 143 95 150 42QSM024DS 920 270...

Page 9: ...2 INSTALLTION SPACE ...

Page 10: ...3 STATIC PRESSURE ...

Page 11: ...4 STATIC PRESSURE 42QSM012DS ...

Page 12: ...5 STATIC PRESSURE 42QSM018DS ...

Page 13: ...6 STATIC PRESSURE 42QSM024DS ...

Page 14: ...ture sensor wire 3 Screw off the screws to remove electronic control box 2 Remove the display board 1 Remove the cover of electronic control box Repeat the operation of step1 of No1 2 Disconnect the display board wire connected to PCB 3 Remove the sticker 3 Move the display board according to the arrow direction to disassemble it Four screws Connector Plug of room temperate sensor and evaporator t...

Page 15: ... the electronic control box 4 Remove the fan capacitor 1 Remove the cover of electronic control box Repeat the operation of step1 of No1 2 Disconnect the fan capacity wire Repeat the operation of step2 of No1 3 Screw off the screw to remover it 5 Remover the fan motor 1 Screw off the fixing screws to remove the rear cover board Press the four fixing holders from four corners to remove the PCB 1 sc...

Page 16: ...then you can remove the fan motor 6 Remove the water collector assembly 1 Remove the rear cover board Repeat the operation of step1 of No 5 2 Screw off the screws to remove the water collector assembly 4 screws Press the clips to take off the volute shell Press Press Rear beam Total four screws at the left side and right side The fan motor assembly and fan wheel assembly can be removed after took ...

Page 17: ... the water collector Repeat the operation of No 6 2 Remove the evaporator sensor 3 Remove the pipe clamp board 4 Remove the evaporator support board 3 screws 3 screws 3 screws Evaporator sensor 2 screws 4 screws Water collector assembly ...

Page 18: ...11 5 Screw off the fixing screws to remove the evaporator 1 screw ...

Page 19: ...PART 1 GENERAL INFORMATION 1 2 CASEETTE ...

Page 20: ...4 install hanger Body Drain pipe 32 Fresh air intake 65 647 647 50 Drain hole for Service 545 570 260 68 42 157 126 44 Wiring connection port 75 150 Distribution duct 2 E parts box 4 Screw hole for install panel 523 570 Wiring connection port 170 2 ...

Page 21: ...rt 680 780 780 680 136 126 91 196 132 A A B A A B A A B A B Service hole for draining pump Fresh air intake 75 55 80 80 4 install hanger Gas side Liquid side E parts box 135 90 Panel Body 92 92 92 92 D D 92 92 D D D D 92 92 92 92 92 92 92 92 D D Unit mm Model A B C D 42QTD024DS 160 95 245 60 ...

Page 22: ...3 INSTALLTION SPACE ...

Page 23: ...of step1 of No 1 2 Remove the grille Screw off two screws Disconnect the display board wire and swing motor wire connected to the PCB Remove the grille 3 Loose the four screws and two wireropes then the panel can be disassembled 3 Remove the display 1 Open the grille Repeat the operation of step1 of No 1 2 Remove the grille Repeat the operation of step2 of No 2 Grill switch 2 screws 4 screws 2 wir...

Page 24: ... Repeat the operation of step1 2 3 of No 2 2 Screw off 3 screws to remove the swing motor assy 3 Screw off 1 screws to remove the swing motor 5 Remove the PCB 1 Open the grille Repeat the operation of step1 of No 1 No need to remove the panel 2 Disassemble the electronic control box cover after remove the 2 screws 2 screws 4 screws 4 screws 3 screws 1 screw ...

Page 25: ... 2 Remove the electronic control box cover Repeat the operation of step 2 of No 5 3 Pull out all the plugs or connectors connected to the electronic control box 4 Remove the electronic control box Remove the 2 screws to disassemble the electronic control box 7 Remover the fan wheel 1 Repeat the operation of No 5 2 Remove the ventilation ring Release the 4 screws to disassemble it 2 screws Pump RY2...

Page 26: ...fan motor 1 Repeat the operation of No 6 2 Remove the fixing board of fan motor wire 3 Remove the 5 screws to disassemble the fan motor 9 Remove the water collecting 1 Remove the panel Repeat the operation of No 2 2 Remove the electronic control box Repeat the operation of No 6 3 nuts 5 screws ...

Page 27: ...r collecting assembly 10 Remove the draining pump 1 Remove the panel Repeat the operation of No 2 2 Remove the electronic control box Repeat the operation of No 6 3 Remove the water collecting assembly Repeat the operation of No 9 4 Disconnect the drain pipe 5 Release 2 screws to remove the pump supporter Be careful of the connection wires ...

Page 28: ...ut of the supporter 11 Remove the evaporator 1 Remove the water collecting assembly Repeat the operation of No 9 2 Remove the seal board of evaporator 3 Remove the evaporator fixing board 4 Remove the evaporator fixing clamps to disassemble the evaporator 3 screws Fixing clamps 1 screw 4 screws ...

Page 29: ...PART 1 GENERAL INFORMATION 1 3 UNDER CEILING ...

Page 30: ...2 DIMENSIONS A B 220 222 C 120 2 40 120 140 2 33 Wiring connection port 204 94 Fresh air intake Drain discharge port Refrigerant pipe hole Hanging arm D M0del A B C D 42QZL018 24DS 1068 675 235 983 ...

Page 31: ...3 INSTALLTION SPACE ...

Page 32: ...Pull the grille locker till the screws appears and release these screws 2 Remove the air return grille watch the lockers under the grilles 2 Remove the control PCB 1 Release 2 screws fixing the control box and then take it out 2 Screw off the 2 screws to remove the cover of the control box 1 2 ...

Page 33: ...the wires of plugs connected to the PCB 5 Remove the PCB from the fixing pins 3 Remove the fan motor and fan wheel 1 Remove the stickers stick to the volute shell Main PCB Fan Capacitor Transformer Power cord terminal Control wires for outdoor unit Power input Indoor fan control Temperature sensors T1 T2 To Display board Input output of transformer Swing motor control Stickers ...

Page 34: ...eel assembly 4 Release the screws locking the fan wheel on the shaft you can remove the fan wheels Press the clips to take off the volute shell The fan motor assembly and fan wheel assembly can be removed after took off the 2screws used to fix the fan motor fixing clamps Press Take off the screw to remove the fan wheel ...

Page 35: ... it 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 4 Release 2 screws fixing the display PCB 5 Unplug the wires 5 Remove the vertical swing motor 1 Remove the drain pan assembly Release the 2 screws Release the screw Push it upwards ...

Page 36: ...emove it 6 Remove 2 horizontal swing motors on both sides off the unit 1 Remove the motor protective cover 2 Screw off the 2 fixing screws to remove swing motor 7 Remove the evaporator assembly 1 Remove the 4 screws 2 on left side and 2 on right side fixing the evaporator on both sides of the unit 2 Remove the evaporator 2 screws ...

Page 37: ...PART 1 GENERAL INFORMATION 1 4 OUTDOOR UNIT ...

Page 38: ...2 DIMENSIONS Model W D H W1 A B 38QUS012 18DS 810 310 558 874 549 325 38QUS024DS 845 320 700 908 560 335 ...

Page 39: ...3 INSTALLTION SPACE More than 60cm More than 30cm More than 60cm More than 200cm Air inlet Air inlet More than 30cm Air outlet Wall or obstacle Maintain channel ...

Page 40: ...IQUID SIDE GAS SIDE HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER Compressor 2 WAY VALVE 3 WAY VALVE 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor T1 Room temp sensor T3 Condenser temp sensor Accumulator T5 Discharge temp sensor T4 Ambient temp sensor INDOOR OUTDOOR ...

Page 41: ...onditioner and turn OFF the power breaker 2 Remove the top cover 7 screws 3 Remove the front panel 8 screws 2 Fan ass y How to remove the fan ass y 1 Remove the panel plate from procedure 1 2 Remove the hex nut fixing the fan and then the fan can be removed 3 Open the electronic box cover fixing with clips and Top cover Front panel ...

Page 42: ...e fan motor 3 Electrical parts How to remove the electrical 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 3 Remove the wires connected with the compressor the 4 way valve and the temp sensors T3 T4 T5 ...

Page 43: ... wire 6 Remove the two screws fixing the electronic control box 7 Then remove the electrical parts 4 Compressor How to remove thecompressor 1 Perform work of item1 2 3 2 Remove the discharge pipe and suction pipe with a burner 3 Remove the hex nuts and washers fixing the ...

Page 44: ...8 compressor on bottom plate 4 Lift the compressor from the base pan assembly ...

Page 45: ...PART 2 ELECTRICAL DIAGRAM ...

Page 46: ...1 WIRING DIAGRAM 42QSM012 18 24DS ...

Page 47: ...2 WIRING DIAGRAM 42QTD012 18DS ...

Page 48: ...3 WIRING DIAGRAM 42QTD024DS ...

Page 49: ...4 WIRING DIAGRAM 42QZL018 24DS ...

Page 50: ...5 WIRING DIAGRAM 38QUS012DS ...

Page 51: ...6 WIRING DIAGRAM 38QUS018DS ...

Page 52: ...7 WIRING DIAGRAM 38QUS024DS ...

Page 53: ...PART 3 TROUBLE SHOOTING ...

Page 54: ...ge 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 Note The picture above is only for reference The plug of your side may be different ...

Page 55: ...ODE 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: ...ain pump 1 time O F0 Operation current protection 2 times O F1 Open circuit or short circuit of outdoor ambient T4 temperature sensor 3 times O F2 Open circuit or short circuit of condenser coil temperature T3 sensor 4 times O F3 Open circuit or short circuit of compressor discharge T5 temperature sensor 5 times O F4 Outdoor unit EEPROM parameter error 6 times O F5 Outdoor fan speed has been out o...

Page 57: ...chip Supposed causes Installation mistake PCB faulty Trouble shooting Yes Replace the indoor outdoor main PCB Power off then restart the unit 2 minutes later EEPROM An electrically erasable programmable read only memory whose contents can be erased and reprogrammed using a pulsed voltage Indoor PCB Outdoor PCB Note The two photos above are only for reference it may be not same totally with the one...

Page 58: ... N Yes Power off then restart the unit 2 minutes later Power off then restart the unit 2 minutes later No Replace the outdoor main PCB Power on Is the error extinguished Replace the outdoor main PCB Power on Is the error extinguished Check the outdoor wiring connection Check the outdoor wiring connection Replace the indoor main PCB Power on Is the error extinguished Replace the indoor main PCB Pow...

Page 59: ...3 Zero crossing detection error diagnosis and solution E2 Yes Indoor main PCB is defective Replace indoor main PCB Power off then restart the unit 2 minutes later Only available for AC motor of high wall ...

Page 60: ...ilure Supposed causes Wiring mistake Fan ass y faulty Fan motor faulty PCB faulty Power off then restart the unit 2 minutes later Shut off the power supply Rotate the fan by hand The unit operates normally Find out the cause and have it solved Check the wiring of fan motor No Yes No Correct the connections No No Replace the fan motor Yes Yes Measure the voltage for the fan motor from the main PCB ...

Page 61: ...conditions If the sampling voltage is lower than 0 06V or higher than 4 94V the LED will display the failure Supposed causes Wiring mistake Sensor faulty Check the connection between temperature sensor and PCB Correct the connection bo Yes Replace indoor or outdoor main PCB Measure the resistance value of the sensor Repalce the sensor bo Yes ...

Page 62: ...ntinuous 4 seconds and this situation happens 3 times the display area will show EC and AC will turn off Supposed causes T2 sensor faulty Indoor PCB faulty System problems such as leakage or blocking Check cool air blowing out from indoor air outlet Yes Yes Check if T2 sensor No Check leakage of system No Power off then restart the unit 2 minutes later Replace indoor PCB Yes Repair the leakage and...

Page 63: ... the water level switch well Insert the water level switch well If the water level switch is broken If the water level switch is broken Yes Replace the water level switch Replace the water level switch Replace the water pump If malfunction is still not solved Replace the water pump If malfunction is still not solved Yes No Yes Replace the indoor main PCB Replace the indoor main PCB Power off then ...

Page 64: ...ature is higher than 50 No Stop the unit Yes Judge 3 Check whether the outdoor unit is bad ventilation No Make the outdoor unit ventilate well Yes Judge 5 The refrigerant pipe is blocked No Let the refrigerant out then use the high pressure nitrogen or refrigerant to blow pipe vacuumize and charge the refrigerant again Yes Judge 4 Check whether the heat exchanger is dirty No Clean the heat exchang...

Page 65: ...lfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Check the wiring between main PCB and compressor Correct the connection or replace the wires and connectors Yes No Check the IPM No Yes Replace the IPM board or replace the main PCB Check the outdoor fan and the outdoor unit ventilation No Please refer to the solution of Fan Speed Has Been Out Of Control malfunction Yes C...

Page 66: ...pposed causes Power supply problems System leakage or block PCB faulty Check the power supply Check the connections and wires Stop the unit No Yes No Correct the connections or replace the wires Yes Replace the reactor Yes No Replace the IPM board Check the voltage between P and N Check the reactor Yes No Replace outdoor main PCB Remark Measure the DC voltage between P and N port The normal value ...

Page 67: ...aulty Check the air flow system of indoor and outdoor units Clear up the air inlet and outlet or the heat exchanger of indoor and outdoor units Yes No Yes Yes Power off then restart the unit 10 minutes later Check if the temperature of compressor No Check refrigerant system Yes Check the overload protector Correct the connection No Measure the resistance between the two ports of the OLP Is it zero...

Page 68: ...s Wiring mistake IPM malfunction Outdoor fan ass y faulty Compressor malfunction Outdoor PCB faulty Check the wiring between main PCB and compressor Correct the connection or replace the wires and connectors Yes No Check the IPM No Yes Replace the IPM board or replace the main PCB Check the outdoor fan and the outdoor unit ventilation No Please refer to the solution of Fan Speed Has Been Out Of Co...

Page 69: ...5 116 0 40060 3 41 5878 37 5 87359 77 1 29078 117 0 38991 2 39 8239 38 5 62961 78 1 25423 118 0 37956 1 37 1988 39 5 39689 79 1 21330 119 0 36954 0 35 2024 40 5 17519 80 1 17393 120 0 35982 1 33 3269 41 4 96392 81 1 13604 121 0 35042 2 31 5635 42 4 76253 82 1 09958 122 0 3413 3 29 9058 43 4 57050 83 1 06448 123 0 33246 4 28 3459 44 4 38736 84 1 03069 124 0 32390 5 26 8778 45 4 21263 85 0 99815 125...

Page 70: ... 37 3 74 8 358 114 2 489 5 234 9 35 35 78 75 8 084 115 2 422 4 222 8 36 34 32 76 7 82 116 2 357 3 211 4 37 32 94 77 7 566 117 2 294 2 200 7 38 31 62 78 7 321 118 2 233 1 190 5 39 30 36 79 7 086 119 2 174 0 180 9 40 29 15 80 6 859 120 2 117 1 171 9 41 28 81 6 641 121 2 061 2 163 3 42 26 9 82 6 43 122 2 007 3 155 2 43 25 86 83 6 228 123 1 955 4 147 6 44 24 85 84 6 033 124 1 905 5 140 4 45 23 89 85 5...

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