Carrier 38QUS018DS2 Series Service Manual Download

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Service Manual

AIR CONDITIONER

DC INVERTER MULTI TYPE

This manual applies to models:

High Wall

42QHF009DS

42QHF012DS

42QHF018DS

Duct

42QSM009DS

42QSM012DS

42QSM018DS

Cassette

42QTD009DS

42QTD012DS

42QTD018DS

Console

42QFA009DS

42QFA012DS

42QFA018DS

Universal CDU

38QUS018DS2

38QUS027DS3

38QUS036DS4

Summary of Contents for 38QUS018DS2 Series

Page 1: ...LTI TYPE This manual applies to models High Wall 42QHF009DS 42QHF012DS 42QHF018DS Duct 42QSM009DS 42QSM012DS 42QSM018DS Cassette 42QTD009DS 42QTD012DS 42QTD018DS Console 42QFA009DS 42QFA012DS 42QFA018DS Universal CDU 38QUS018DS2 38QUS027DS3 38QUS036DS4 ...

Page 2: ...mensions 11 4 Service space for light commercial indoor 18 5 Wiring Diagram 20 6 Refrigeration Cycle Diagram 25 7 Indoor units combination 27 8 Static Pressure Duct 28 9 Operation Characteristics 29 10 Installation Details 30 11 Electronic control function 40 12 Troubleshooting 57 ...

Page 3: ...990x345x965 TNB306FPGMC L Indoor High wall A5 Duct Four way cassette compact Console Model name Dimension mm 42QHF009DS 800x188x275 42QHF012DS 800x188x275 42QHF018DS 940x205x275 42QSM009DS 700x635x210 42QSM012DS 700x635x210 42QSM018DS 920x635x210 42QTD009DS 570x570x260 42QTD012DS 570x570x260 42QTD018DS 570x570x260 42QFA009DS 700x600x210 42QFA012DS 700x600x210 42QFA018DS 700x600x210 ...

Page 4: ... valves and prevents water from dripping 4 way valve control It is only operated in the heating operation mode except defrosting operation Outdoor unit Power relay control Hydrophilic aluminum fin Anti rust cabinet Valve protection cover Low noise air flow system Discharge pipe temperature protection High wall Filter Refrigerant leakage detect Anti rust cabinet Self diag Function Low noise air flo...

Page 5: ... are designed in the four corners of the body which can save installation space Electric control box built in design The E box is simply and safely built inside the indoor unit It s convenient for installation and maintenance Can check the control part easily you only need to open the air return grille Fresh air intake function Fresh air fulfills air quality more healthy and comfortable ...

Page 6: ...6 78 Air passage function Reserves the space for air outlet from the side of indoor unit It s availed to connect air duct from the two sides to the nearby small rooms Dimension Φ75mm Fresh Air ...

Page 7: ... frame from rear and bottom is same it s very easy to move the cover from bottom to rear side or from rear to the bottom in order to matching the installation condition Fresh air intake function Install one duct from the reserved fresh air intake to outdoor Continually inhale the fresh air to improve the quality of the indoor air fulfills air quality more healthy and comfortable Front Board Canvas...

Page 8: ...y Remove a half of blower housing and take out the motor with centrifugal fan Directly remove two bolts and then replace the motor or centrifugal fan easily Reserved remote on off and central control ports Reserved remote on off ports and central control ports can connect the cable of an on off controller or a central controller to realize remote on off control function or group control function M...

Page 9: ... The unit will realized remoter control The wired controller and the display board can display the error code or production code when the chips detect some failure 2 5 Console 1 New design more modern and elegant appearance 2 Convenient installation The console type can be easily installed into a corner of the console even if the console is very narrow It is especially useful when installation of ...

Page 10: ...air flow distribution to provide more comfortable air circulation no matter where the unit is set up 4 Three level fan speed more humanism design meets different air supply requirement 5 Water proof by utilizing the absorbing plastic film on water collector 6 Easy operation Auto restart function remote control and optional wire control method 7 Low noise level plus compact size Shape of the blades...

Page 11: ...11 78 3 Dimensions 3 1 Out door 38QUS018DS2 560 W1 H 6 D1 335 D2 360 845 W 313 D3 335 D1 R6 R5 A1 22 A2 50 B1 120 110 B2 700 W2 73 58 58 58 110 H1 H2 200 7 243 6 L1 L2 ...

Page 12: ...12 78 38QUS027DS3 900 W 590 W1 860 H 12 D2 355 D1 333 302 D3 333 D1 50 97 90 B2 B1 8 A2 55 55 55 55 55 110 62 W2 H1 H2 R6 238 4 285 7 L1 L2 ...

Page 13: ...13 78 38QUS036DS4 624 W1 990 W D2 397 D1 366 965 10 H 78 W2 340 366 D3 D1 125 145 B1 B2 60 22 A2 A1 55 140 H1 H2 R5 R6 ...

Page 14: ...14 78 3 2 High wall W H D Model W D H 42QHF009DS 42QHF012DS 800 188 275 42QHF018DS 940 205 275 ...

Page 15: ... parts box Gas side Liquid side 4 install hanger Body Wiring connection port Drain pipe 32 Fresh air intake 65 570 545 570 523 260 647 647 50 150 Distribution duct 170 2 2 4 Screw hole for install panel Drain hole for Service 75 156 125 68 40 44 ...

Page 16: ...16 78 3 4 A5 Duct ...

Page 17: ... 78 3 5 Console a Wall mounting installation Dimension Mode A B C D E F G H 42QFA009DS 990 660 206 505 506 907 200 203 42QFA012DS 990 660 206 505 506 907 200 203 42QFA018DS 990 660 206 505 506 907 200 203 ...

Page 18: ...al indoor 4 1 Four way cassette compact unit mm 4 2 A5 Duct unit mm Ensure enough space required for installation and maintenance All the indoor units reserve the hole to joint the fresh air pipe The hole size as following 4 3 Console unit mm ...

Page 19: ...19 78 ...

Page 20: ...20 78 5 Wiring Diagram Outdoor 38QUS018DS2 Outdoor 38QUS027DS3 ...

Page 21: ...21 78 Outdoor 38QUS036DS4 High wall 42QHF009DS 42QHF012DS 42QHF018DS ...

Page 22: ...22 78 A5 Duct 42QSM009DS A5 Duct 42QSM012DS 42QSM018DS ...

Page 23: ...23 78 Four way cassette 42QTD009DS Four way cassette 42QTD012DS 42QTD018DS ...

Page 24: ...24 78 Console ...

Page 25: ... B GAS VALVE B Accumulator T2B A Evaporator temp sensor outlet T2B B 6 2 Refrigeration circuit drawing of 38QUS027DS3 LIQUID VALVE A GAS VALVE A HEAT EXCHANGE EVAPORATOR HEAT EXCHANGE CONDENSER Compressor 4 WAY VALVE COOLING HEATING T2 Evaporator temp sensor middle T1 Room temp sensor T3 Condenser temp sensor T5 Discharge temp sensor T4 Ambient temp sensor INDOOR OUTDOOR EXV A CAPILIARY A CHECK VA...

Page 26: ... T3 Condenser temp sensor T5 Discharge temp sensor T4 Ambient temp sensor INDOOR OUTDOOR EXV A CAPILIARY A CHECK VALVE CAPILIARY TUBE EXV B CAPILIARY B LIQUID VALVE B GAS VALVE B EXV C CAPILIARY C LIQUID VALVE C GAS VALVE C EXV D CAPILIARY D LIQUID VALVE D GAS VALVE D Accumulator High pressure switch Low pressure switch T2B A Evaporator temp sensor outlet T2B B T2B C T2B D ...

Page 27: ... Two unit Three unit 9 9 9 12 18 9 9 9 9 12 12 12 9 12 12 18 9 9 12 12 12 12 18 9 18 18 18 9 9 18 7 3 Indoor unit combination for 38QUS036DS4 One unit Two unit Three unit Four unit 9 9 9 12 12 9 9 9 9 12 12 12 12 12 9 9 9 9 9 9 12 12 9 12 12 18 12 9 12 12 18 9 9 12 9 12 18 12 12 18 9 9 9 12 9 9 12 18 12 12 12 12 18 9 18 18 18 9 9 18 9 18 18 12 18 18 9 9 9 18 9 12 12 12 ...

Page 28: ...igh speed 500 400 300 200 Low speed 10 20 30 40 50 60 70 80 90 Pa 600 700 800 900 1000 1100 Air volume m h 3 External static pressure Pa High speed Mid speed 1200 0 100 200 300 400 500 600 700 800 0 5 10 15 20 25 30 35 40 Air flow rate m3 h External static pressure Pa ...

Page 29: ...conditions certain safety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set HIGH fan mode 3 The optimum perfo...

Page 30: ...ble fuse and switch 10 3 Pipe length and the elevation Maximum piping length and height difference 1 drive 2 1 drive 3 1 drive 4 Max length for all rooms m 30 45 60 Max length for one IU m 20 25 30 Max height difference between IU and OU m OU higher than IU 10 10 10 OU lower than IU 15 15 15 Max height difference between IUs m 10 10 10 Charge less length m 10 15 20 Additional refrigerant charge R4...

Page 31: ...perating current rises Cooling or heating efficiency drops Moisture in the refrigerant circuit may freeze and block capillary tubing Water may lead to corrosion of parts in the refrigerant system Therefore the indoor units and the pipes between indoor and outdoor units must be leak tested and evacuated to remove gas and moisture from the system Gas leak check Soap water method Apply soap water or ...

Page 32: ... 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 counterclockwise for 6 or 7seconds after the gas coming out then tighten the flare nut again Make sure th...

Page 33: ...leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 M Pa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench ...

Page 34: ...electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 6 When the electronic scale displays the proper weight refer to the table disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount ...

Page 35: ...he weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 6 When the electronic scale displays the proper weight refer to the gauge and the pressure of the low side disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mo...

Page 36: ...le Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly 4 Set the 2 way valve to the close position 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1MPa 6 Set the 3 way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0 3 to 0 5Mpa Disconnect the charg...

Page 37: ... way valve 4 Check the gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 MPa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure ...

Page 38: ...ed position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 4 Close the valve Low side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 5 Disconnect the charge hose from the vacuum pump ...

Page 39: ... refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g each time operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedure 5 When the electronic scale displays the proper weight disconnect the charge hose from the 3 way val...

Page 40: ...tandby the LED displays In compressor operation the LED display the running frequency In defrosting mode The LED displays dF or alternative displays between running frequency and dF each displays 0 5s In compressor pre heating The LED displays PH or alternative displays between running frequency and PH each displays 0 5s During the oil return process The LED displays RO or alternative displays bet...

Page 41: ...emp is lower than 9 degree the digital display tube will show 9 If the temp is higher than 70 degree the digital display tube will show 70 If the indoor unit is not connected the digital display tube will show 18 B indoor unit evaporator outlet temp T2BB 19 C indoor unit evaporator outlet temp T2BC 20 D indoor unit evaporator outlet temp T2BD 21 E indoor unit evaporator outlet temp T2BE 22 A indoo...

Page 42: ... Frequency limit caused by T2 Bit3 Frequency limit caused by T3 Bit2 Frequency limit caused by T5 Bit1 Frequency limit caused by current Bit0 Frequency limit caused by voltage 43 Average value of T2 Sum T2 value of all indoor units number of indoor units in good connection 44 Outdoor unit fan motor state Off 0 High speed 1 Med speed 2 Low speed 3 Breeze 4 Super breeze 5 45 The last error or protec...

Page 43: ...ndoor display board 11 5 1 High wall 1 DEFROST indication lamp For cooling heating models only Lights up when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating operation 2 OPERATION indication lamp This lamp illuminates when the air conditioner is in operation 3 TIMER indication lamp Lights up during Timer operation 4 Temperature indic...

Page 44: ...ing frequency will be limited as below rules If 102 T5 115 decrease the frequency to the lower level every 2 minutes till to F1 If T5 115 for 10 seconds the compressor will stop and restart till T5 90 11 6 3 Low voltage protection OPERATION TIMER DEF FAN ALARM Temporary button Operation lamp Timer indicator Infrared signal receiver Alarm indicator PRE DEF indicator cooling and heating type or fan ...

Page 45: ...hen the frequency COOL_F4 via capacity demand COOL_F15 ICOOLLMT11 COOL_F14 ICOOLLMT10 COOL_F13 ICOOLLMT9 COOL_F12 ICOOLLMT8 COOL_F11 ICOOLLMT7 COOL_F10 ICOOLLMT6 COOL_F9 ICOOLLMT5 COOL_F8 ICOOLLMT4 COOL_F7 ICOOLLMT3 COOL_F6 ICOOLLMT2 COOL_F5 ICOOLLMT1 If the current frequency is lower than COOL_F4 the frequency will not be limited After 10s of the compressor start if the current ICOOL the AC will ...

Page 46: ...n T2 4 for 250 seconds or T2 0 the indoor unit capacity demand will be zero and resume to normal when T2 8 and the time of protection is no less than 3 minutes 11 6 8 Oil return Running rules 1 If the compressor frequency keeps lower than RET_OIL_FREQ1_ADD for RET_OIL_TIME1_ADD the AC will rise the frequency to RET_OIL_FREQ2_ADD for RET_OIL_TIME2_ADD and then resume to former frequency 2 The EXV w...

Page 47: ...For the other types When T1 TA 3 transfer high to medium speed When T1 TA 1 transfer medium speed to low When T1 TA 1 transfer low to medium speed When T1 TA 4 transfer medium speed to high For Four way cassette compact TA 23 For A2 four way cassette compact A5 Duct TA 24 5 PTC function and sleep mode are invalid 11 7 2 Cooling mode 11 7 2 1 Compressor running rules The compressor will run at corr...

Page 48: ...ty demand 0 1 2 15 16 Meanwhile the maximum running frequency will be adjusted according to the outdoor ambient temp 43 41 38 T4LimFre1_ADD No limit T4LimFre2_ADD T4LimFre3_ADD 42 39 37 49 46 T4LimFre4_ADD T4LimFre5_ADD 48 45 ...

Page 49: ...ps running fan speed can be set in high mid low Auto by using a remote controller 2 Auto fan in cooling mode acts as follow For Console A3 four way cassette compact 3 5 T1 Ts 3 High Low 1 Medium 1 5 For A5 duct 4 T1 Ts 3 High Low 1 Medium 1 5 For the other types 21 19 A C 18 16 D 15 13 12 10 B E 28 26 E C 25 23 B 22 20 19 17 D A Cooling Heating ...

Page 50: ...nd can t be changed The louver angle is the same as in cooling mode 11 7 3 2 Low indoor room temperature protection In drying mode if room temperature is lower than 10 the indoor fan will stop and not resume until room temperature exceeds 12 11 7 3 3 Evaporator anti freezing protection and condenser high temperature protection are active and the same as that in cooling mode 11 7 3 4 The outdoor fa...

Page 51: ...ng mode Indoor Fan can be set at HIGH MID LOW AUTO by using a remote controller but Anti cold wind function prevails Anti cold wind control function in heating mode 2 Auto wind in heating mode For Console 2 5 T1 Ts ΔT 2 High Low 1 Medium 1 5 For A5 duct 2 5 T1 Ts 6 ΔT 2 High Low 1 Medium 1 5 For the other types ...

Page 52: ...an and compressor stop the Indoor fan will run in setting fan speed otherwise the Indoor fan will run in low Anti cold wind function has the priority 11 7 4 6 Defrosting mode Condition of defrosting If any one of the following items is satisfied AC will enter the defrosting mode After the compressor starts up and keeps running mark the minimum value of T3 from the 10th minutes to 15th minutes as T...

Page 53: ... in relevant mode If the machine switches mode between heating and cooling the compressor will keep stopping for 15 minutes and then choose mode according to T1 Ts If the setting temperature is modified the machine will choose running function again 11 7 6 Forced operation function 11 7 6 1 Enter forced operation function Pressing the touch button once the machine will transfer into forced auto mo...

Page 54: ... 7 4 Timer on off The machine will turn on automatically when reaching the setting on time and then turn off automatically when reaching the setting off time 11 7 7 5 Timer off on The machine will turn off automatically when reaching the setting off time and then turn on automatically when reaching the setting on time 11 7 7 6 The timer function will not change the AC current operation mode Suppos...

Page 55: ...d turn to auto mode as 24 setting temp If AC is off before power off and AC is required to start up now the compressor will have 1 minute delay when power on Other conditions the compressor will have 3 minutes delay when restarts 11 7 10 Drain pump control For Duct Cassette Adopt the water level switch to control the action of drain pump Main action under different condition every 5 seconds the sy...

Page 56: ...o heating mode after compressor stop 3 minutes In case of one Indoor unit working in heating mode and another indoor unit is set to cooling mode or fan mode the indoor unit setting to cooling mode or fan mode will change to stand by The outdoor unit will continue working in heating mode If heating mode stops not including the indoor unit in heating mode reaching the set temperature 3 minutes after...

Page 57: ... protection Just matching with 38QUS036DS4 O light X off flash Light Commercial series Cassette Duct NO MALFUNCTION RUN Timer DEF Alarm DISPLAY DIGITAL TUBE 1 Open or short circuit of T1 temperature sensor X X X E0 2 Open or short circuit of T2 temperature sensor X X X E1 3 Indoor outdoor units communication error X X X E2 4 Full water malfunction X X X E3 5 Indoor EEPROM malfunction X X E4 6 IPM ...

Page 58: ...temperature sensor E5 Voltage protection E8 Outdoor fan speed has been out of control F1 No A Indoor unit coil outlet temperature sensor or connector of sensor is defective F2 No B Indoor unit coil outlet temperature sensor or connector of sensor is defective F3 No C Indoor unit coil outlet temperature sensor or connector of sensor is defective F4 No D Indoor unit coil outlet temperature sensor or...

Page 59: ...ther the EEPROM chip plugged in PCB well Yes No Yes Insert the EEPROM well Replace the indoor PCB Shut off the power supply and turn it on 1 minute later Is it still displaying the error code EEPROM An electrically erasable programmable read only memory whose contents can be erased and reprogrammed using a pulsed voltage 12 3 1 2 Indoor outdoor units communication error ...

Page 60: ... by remote controller Is all indoor unit display Turn off the all indoor units Is IPM power LED or operating LED lamp On Refer PIC2 Yes A Is all the wiring between terminal and Indoor PCB connect ok No Yes A No Reconnect the wiring Is indoor units number correct Check on the outdoor check point 2 for dual zone 3 for tri zone 4 for qua zone Refer PIC 4 Yes No first time Yes Yes Change the Indoor PC...

Page 61: ...D when power on and unit standby Self Check Operating Pic 3 IPM or outdoor main PCB For 38VNM327713 38VNM436713 Pic 1 check the voltage of N to S Vs is it moving alternately between positive value and negative value PIC 5 check point button Press 1 time for check how many indoor units are connected ...

Page 62: ...ons good Check the wiring of fan motor Are all the connections good No Yes No Correct the connections Correct the connections No Replace the fan motor Replace the fan motor Yes Yes Replace the main PCB Replace the main PCB No Check whether the main PCB is normal through index 1 Check whether the main PCB is normal through index 1 Yes No Index 1 1 Indoor AC fan motor Power on and set the unit runni...

Page 63: ...olor Signal Voltage 1 Red Vs Vm 280V 380V 2 3 Black GND 0V 4 White Vcc 14 17 5V 5 Yellow Vsp 0 5 6V 6 Blue FG 14 17 5V For other types NO Color Signal Voltage 1 Red Vs Vm 192V 380V 2 3 Black GND 0V 4 White Vcc 13 5 16 5V 5 Yellow Vsp 0 6 5V 6 Blue FG 13 5 16 5V ...

Page 64: ...s 12 3 1 5 Full water malfunction For cassette A5 duct If the water level switch is inserted well If the water level switch is inserted well No Insert 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 n...

Page 65: ...ck whether the EEPROM chip plugged in PCB well Yes No Yes Insert the EEPROM well Replace the outdoor main board Outdoor EEPROM malfunction EEPROM An electrically erasable programmable read only memory whose contents can be erased and reprogrammed using a pulsed voltage 12 3 2 2 Communication malfunction between IPM board and outdoor main board ODU E3 ...

Page 66: ...ard and the main board is it connected good Reconnect and retry Is error still display Replace IPM board and then check whether the system can run normally Replace the electric control box No No No No Yes Trouble is solved No Yes Replace outdoor main board and then check whether the system can run normally No Yes Yes E3 display 12 3 2 3 Voltage protection ODU E5 ...

Page 67: ...e power supply Check whether the voltage of IPM board P and N is normal DC277 356V for 18 27KBtu h DC277 410V for 36 42KBtu h Replace bridge rectifiers and then check whether the system can run normally Replace IPM board and then check whether the system can run normally Replace outdoor main board Yes No No No No Yes Trouble is solved Yes Yes ...

Page 68: ...ix the fan are tighten Check the wiring of fan motor Are all the connections good Check the wiring of fan motor Are all the connections good No Yes No Correct the connections Correct the connections No Replace the fan motor Replace the fan motor Yes Yes Replace the main PCB Replace the main PCB No Check whether the main PCB is normal through index 1 Check whether the main PCB is normal through ind...

Page 69: ...nt temperature is higher than 50 Check whether the outdoor ambient temperature is higher than 50 No Stop the unit Stop the unit Yes Check if the outdoor unit ventilation is good Check if the outdoor unit ventilation is good Yes Make the outdoor unit ventilate well Make the outdoor unit ventilate well Check whether the heat exchanger is dirty Check whether the heat exchanger is dirty No Clean the h...

Page 70: ... protector is broken Whether the low pressure protector is broken Check whether the outdoor ambient temperature is too low Check whether the outdoor ambient temperature is too low No Stop the unit Stop the unit Yes Open fully valve core of high pressure valve Open fully valve core of high pressure valve No Check whether valve core of high pressure valve is opened Check whether valve core of high p...

Page 71: ...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 exchanger Yes Yes Replace outdoor main ...

Page 72: ...wiring diagrams Measure the resistance value of compressor discharge temp sensor If the value is not normal is normal refer to the Appendix 2 Measure the resistance value of compressor discharge temp sensor If the value is not normal is normal refer to the Appendix 2 No Yes Yes No Correct the wiring connection Correct the wiring connection Stop leaking and add refrigerant Stop leaking and add refr...

Page 73: ...oor unit ventilation is good Check if the outdoor unit ventilation is good Yes Make the outdoor unit ventilate well Make the outdoor unit ventilate well Check whether the heat exchanger is dirty Check whether the heat exchanger is dirty No Clean the heat exchanger Clean the heat exchanger Yes Check whether the refrigerant system is ok Check whether the refrigerant system is ok Replace outdoor main...

Page 74: ...ressor check whether the system can work normally Check whether the lines in E part box are connected tightly Yes Connect it tightly check ok or not No No Yes No Replace the bridge rectifiers Check whether the bridge rectifiers are normal Use the multimeter to measure the resistance between each two terminals check whether there is the condition that value of resistance is 0 Check whether the conn...

Page 75: ...7 29464 72 1 53668 112 0 44699 7 52 2438 33 6 98142 73 1 48481 113 0 43482 6 49 3161 34 6 68355 74 1 43498 114 0 42304 5 46 5725 35 6 40021 75 1 38703 115 0 41164 4 44 0000 36 6 13059 76 1 34105 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 96...

Page 76: ...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 5 844 125 1 856 6 133 ...

Page 77: ...g Measure the resistance value of each winding by using the tester Position Resistance Value Unit model 38QUS018DS2 38QUS027DS3 38QUS036DS4 Compressor DA150S1C 20FZ DA250S2C 30MT TNB306FPGMC L Blue Red 0 95Ω 20 0 55Ω 20 0 53Ω 20 ...

Page 78: ...rolytic 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 Several MΩ Red Black Several MΩ P N U N U V V W W Red ...

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Carrier 38QUS018DS2 Series, Service Manual

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