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Carrier 38MARB, Service Manual

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Carrier 38MARB Service Manual Download Page 84

 © 2021 Carrier. All rights reserved.

 A Carrier Company

Edition Date: 07/21

Catalog No: SG-38MARB-02

Replaces: SG-38MARB-01

38MARB: Service Manual

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

84

Summary of Contents for 38MARB

Page 1: ...fies the most serious hazards which will result in severe personal injury or death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices...

Page 2: ...Q30AA3 3 00 36 000 38MARBQ36AA3 OUTDOOR UNIT 38 MA R B Q 36 3 38 OUTDOOR UNIT MA MODEL VOLTAGE 1 115 1 60 3 208 230 1 60 SYSTEM TYPE R OUTDOOR MAXIMUM NUMBER OF FAN COIL UNITS THAT CAN BE CONNECTED TO...

Page 3: ...d shielded wire can be used to replace L2 and S between outdoor unit and indoor unit landing the shield onto ground in the outdoor unit only NOTE Matches with multi family and residential fan coils re...

Page 4: ...1 Connection Diagram 12K 115V Fig 2 Connection Diagram 6K 12K 208 230 1 60V Fig 3 Connection Diagram 24K 36K 208 230 1 60V NOTES 1 Do not use thermostat wire for any connection between indoor and out...

Page 5: ...iagram Size 12K 115V Table 3 Wiring Diagram Size 12K 115V CN2 7 8 Input 115V AC CN18 Output 0 12V DC CN414 Output 0 160V AC CN60 Output 115V AC CN17 Input 0 5V DC CN16 Output 115V AC CN19 Output 115V...

Page 6: ...ng Diagram Sizes 6 12K 208 230V Table 5 Wiring Diagram Sizes 6 12K 208 230V CN1A Input 230V AC CN31 Output 0 12V DC CN7 Output 0 310V AC CN60 Output 230V AC CN21 Input 0 5V DC CN15 Output 230V AC CN17...

Page 7: ...Size 18K 208 230V Table 7 Wiring Diagram Size 18K 208 230V CN1A Input 230V AC CN4_2 4_3 Input 230V AC CN7 Output 0 310V AC CN60 Output 230V AC CN21 Input 0 5V DC CN31 Output 0 12V DC CN15 Output 230V...

Page 8: ...P Compressor Top OLP Temperature Sensor EEV Electronic Expansion Valve FM1 DC Fan Motor COMP Compressor HEAT_Y Crankcase Heater CT1 AC Current Detector H PRO High Pressure Switch L PRO Low Pressure Sw...

Page 9: ...H RI KHDW LQVXODWRU OORZDEOH KHLJKW GLIIHUHQFH IW P OORZDEOH SLSH OHQJWK 3XOVH 0RGXODWLQJ 9DOYH DW OLTXLG VLGH 6WUDLQHU 3URSHOOHU IDQ 2XWGRRU KHDW H FKDQJHU RPSUHVVRU PRGHO QXPEHU 6 8 0XIIOHU ZD YDOYH...

Page 10: ...VKDSH RI KHDW LQVXODWRU OORZDEOH KHLJKW GLIIHUHQFH IW P OORZDEOH SLSH OHQJWK 3XOVH 0RGXODWLQJ 9DOYH DW OLTXLG VLGH 6WUDLQHU 3URSHOOHU IDQ 2XWGRRU KHDW H FKDQJHU RPSUHVVRU PRGHO QXPEHU 71 8 0XIIOHU ZD...

Page 11: ...VKDSH RI KHDW LQVXODWRU OORZDEOH KHLJKW GLIIHUHQFH IW P OORZDEOH SLSH OHQJWK 3XOVH 0RGXODWLQJ 9DOYH DW OLTXLG VLGH 6WUDLQHU 3URSHOOHU IDQ 2XWGRRU KHDW H FKDQJHU RPSUHVVRU PRGHO QXPEHU 71 8 0XIIOHU ZD...

Page 12: ...DW LQVXODWRU OORZDEOH KHLJKW GLIIHUHQFH IW P OORZDEOH SLSH OHQJWK 3XOVH 0RGXODWLQJ 9DOYH DW OLTXLG VLGH 6WUDLQHU 3URSHOOHU IDQ 2XWGRRU KHDW H FKDQJHU RPSUHVVRU PRGHO QXPEHU 70 8 7 0XIIOHU ZD YDOYH 0XI...

Page 13: ...KHDW LQVXODWRU OORZDEOH KHLJKW GLIIHUHQFH IW P OORZDEOH SLSH OHQJWK 3XOVH 0RGXODWLQJ 9DOYH DW OLTXLG VLGH 6WUDLQHU 3URSHOOHU IDQ 2XWGRRU KHDW H FKDQJHU RPSUHVVRU PRGHO QXPEHU 70 8 7 0XIIOHU ZD YDOYH 0...

Page 14: ...KHDW LQVXODWRU OORZDEOH KHLJKW GLIIHUHQFH IW P OORZDEOH SLSH OHQJWK 3XOVH 0RGXODWLQJ 9DOYH DW OLTXLG VLGH 6WUDLQHU 3URSHOOHU IDQ 2XWGRRU KHDW H FKDQJHU RPSUHVVRU PRGHO QXPEHU 7 807 0XIIOHU ZD YDOYH 0...

Page 15: ...HDW LQVXODWRU OORZDEOH KHLJKW GLIIHUHQFH IW P OORZDEOH SLSH OHQJWK 3XOVH 0RGXODWLQJ 9DOYH DW OLTXLG VLGH 6WUDLQHU 3URSHOOHU IDQ 2XWGRRU KHDW H FKDQJHU RPSUHVVRU PRGHO QXPEHU 7 807 0XIIOHU ZD YDOYH 0XI...

Page 16: ...up to the allowable length as specified in Table 10 Long Line Applications 1 No change in line sizing is required 2 Add refrigerant per Table 10 Table 10 Additional Charge System Size 12K 6K 9K 12K 1...

Page 17: ...ig 17 Deep Vacuum Graph Triple Evacuation Method The triple evacuation method should be used Refer to Fig 18 and proceed as follows 1 Pump system down to 500 MICRONS of mercury and allow pump to conti...

Page 18: ...stops and the LED displays the failure The correct zero crossing signal time interval should be between 6 13ms Sensor protection at open circuit and breaking disconnection If only one temperature sens...

Page 19: ...etting value the compressor stops HEATING Mode Compressor Running Rules When T1 Ts T the compressor stops When T1 Ts T 1 5 the compressor is on T is the programmed parameter for temperature compensati...

Page 20: ...door temperature reaches the setting temperature the compressor stops the indoor fan motor runs at the minimum speed or setting speed The anti cold air function is valid The indoor fan is controlled a...

Page 21: ...o exit the FORCED DEFROSTING mode press and hold AUTO COOL for 5s again Fig 27 Defrost Chart Defrost Exit Conditions Any of the following conditions will cancel the DEFROST mode and change the unit to...

Page 22: ...OPERATION function When the machine is off press TOUCH to engage the Forced Auto Mode Press TOUCH again within 5 seconds to engage the FORCED COOLING mode In FORCED AUTO FORCED COOLING or any other o...

Page 23: ...the digital code Press OK to send as well Table 12 Inquiry Codes and Symbols To exit the Inquiry Mode Press and hold together the On Off and Fan buttons for 2 seconds CODE INQUIRY SYMBOL DESCRIPTION...

Page 24: ...ly is shut off NOTE Remember to discharge the electricity power in capacitor Fig 30 Electrolytic Capacitors For other models connect discharge resistance approximately 100 40W or a soldering iron plug...

Page 25: ...it or has short circuited Page 35 5 times X EC 54 Compressor discharge temperature sensor TP is an open circuit or has short circuited 5 times X EC 56 Evaporator coil outlet temperature sensor T2B is...

Page 26: ...EN LED2 RED IU DISPLAY SOLUTION 1 IPM malfunction or IGBT over strong current protection X P0 Page 39 2 Over voltage or too low voltage protection O O P1 Page 42 3 EEPROM parameter error O E5 Page 27...

Page 27: ...ameter Error or Compressor Driven Chip EEPROM Parameter Error EC51 Description Outdoor PCB main chip does not receive feedback from the EEPROM chip or the compressor driven chip Recommended parts to r...

Page 28: ...ng connection from indoor terminal to indoor PCB Are they OK Turn on the unit check if W and 1 L are connected Check that the power LED is on No Yes Yes Unplug all the high voltage components connecte...

Page 29: ...e black pin is for 3 port or N or S port the unit is normal running the voltage is moving alternately as positive values and negative values If the outdoor unit has malfunction the voltage will remain...

Page 30: ...sing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal Recommended parts to repair Connection wires Indoor main PCB Troubleshooting and Repair Note Zero crossing dete...

Page 31: ...the unit turns off Recommended parts to repair Connection wires Indoor main PCB Fan assembly Indoor main PCB Troubleshooting YES Turn the power off Wait 2 minutes then restart Is it within normal para...

Page 32: ...otor Outdoor main PCB Troubleshooting NOTE For certain models outdoor PCB could not be removed separately In this case the outdoor electric control box should be replaced as a whole YES Power off Afte...

Page 33: ...erwise proceed to step 2 2 Power on the unit and when the unit is in standby measure the pin4 5 voltage in the feedback signal connector If the value is not 5V change the PCB Otherwise proceed to step...

Page 34: ...is lower than 0 06V or higher than 4 94V the LED displays the failure code Recommended parts to repair Connection wires Sensors Indoor main PCB Troubleshooting Fig 33 Test NOTE Figure 33 and the valu...

Page 35: ...onnection wires Sensors outdoor main PCB Troubleshooting Fig 34 Test NOTE For certain model the outdoor PCB could not be removed separately In this case the outdoor electric control box should be repl...

Page 36: ...than 50Hz however it does not maintain for a minimum of three minutes and this issue occurs 3 times the LED displays the failure code and the unit turns off Recommended parts to repair T2 Sensor Indo...

Page 37: ...r PCB does not receive feedback from the display board Recommended parts to repair Communication wire Indoor PCB Display board Troubleshooting Is it still displaying the error code The unit functions...

Page 38: ...the power wiring Are the L and N wired properly Reconnect L and N Replace the outoor main PCB Is the voltage between L and N normal Is the current normal Power on and measure the voltage between P an...

Page 39: ...tdoor PCB Troubleshooting YES NO Is the IPM terminal resistance uniform NO YES Please refer to the Fan Speed is operating outside of normal range malfunction NO YES YES NO YES NO Check the wiring betw...

Page 40: ...the electrolytic capacitors and ensure all the energy storage has been discharge 3 Disassemble the outdoor PCB or disassemble the IPM board 4 Measure the resistance value between P and U V W N U V W a...

Page 41: ...ut notice and without obligations 41 DIAGNOSIS AND SOLUTION CONT Compressor Check Disconnect the compressor and check the resistance between U V V W and U W and all 3 values should be equal If not the...

Page 42: ...o repair Power supply wires IPM module board PCB Reactor Troubleshooting Check the power supply Is it in working order Turn off the unit NO Check the connections and wires YES Are they in working orde...

Page 43: ...blockages Troubleshooting NOTE For certain models the outdoor PCB can not be removed separately In this case the outdoor electric control box should be replaced as a whole Check if the air flow system...

Page 44: ...ure protector broken Check if the outdoor unit ventilation is good Ensure that the outdoor unit s ventiliation is functioning properly High pressure protection Connect the high pressure switch and mai...

Page 45: ...mmended parts to repair Connection wires IPM module board Outdoor fan assembly Compressor Outdoor PCB Troubleshooting Check the wiring between the PCB and the compressor Is it improperly wired Ensure...

Page 46: ...connect the low pressure protector and the main control board Is the low pressure protector broken Method Disconnect the plug Measure the low pressure protector resistance If the protector is normal t...

Page 47: ...he priority Examples If indoor unit A is operating in the COOLING mode or the FAN mode and indoor unit B is set to the HEATING mode unit A will power off and unit B will continue to operate in the HEA...

Page 48: ...tdoor Main Chip and Compressor Driven Chip PC40 Description The main chip cannot detect the compressor driven chip Recommended parts to repair Outdoor PCB Electric control box Troubleshooting YES NO N...

Page 49: ...sor Check 1 Disconnect the temperature sensor from PCB 2 Measure the sensor s resistance value using a multi meter 3 Check the corresponding temperature sensor s resistance value table Fig 36 Test Be...

Page 50: ...Check 1 Disconnect the compressor power cord from the outdoor PCB 2 Measure the resistance valve of each winding using a multi meter 3 Check the resistance valve of each winding in Table 16 Table 16...

Page 51: ...s and ensure all energy has been discharged 3 Dissemble the outdoor PCB or dissemble the IPM board 4 Measure the resistance valve between P and U V W N U V W and N Fig 38 Testing Digital Tester Resist...

Page 52: ...wer on use a digital tester to measure the voltage when the unit operates in the COOLING mode the voltage is 0V If the voltage value is not in range the PCB is faulty and needs to be replaced Fig 39 M...

Page 53: ...e of each winding using a multi meter 3 Check the resistance value of each winding in Table 17 Fig 41 EXV Check Table 17 Winding Colors LEAD WINDING COLOR NORMAL VALUE Red Blue About 50 Red Yellow Bro...

Page 54: ...1 Temperature sensor checking Disconnect the temperature sensor from PCB measure the resistance value with a tester Fig 42 Tester Temperature sensors Room temp T1 sensor Indoor coil temp T2 sensor Out...

Page 55: ...44 7 1 7 2 8 5 9 5 9 3 8 9 9 1 9 6 11 2 11 9 90 73 32 22 22 78 7 7 7 8 9 6 10 5 10 3 9 5 10 0 10 6 12 4 13 0 PSI 70 59 21 11 15 93 94 106 116 119 113 117 125 147 154 75 63 23 89 17 22 97 99 115 125 12...

Page 56: ...2 78 0 56 27 23 2 78 5 17 13 8 33 10 56 0 2 17 19 17 18 27 28 BAR 55 12 78 30 3 28 5 25 3 22 8 20 8 18 5 16 5 65 18 33 32 5 30 0 26 6 25 4 23 3 20 5 19 0 75 23 89 33 8 31 5 27 8 26 3 24 9 21 5 20 0 P...

Page 57: ...52 596 126 673 1050 10 5 152 25 8 901 48 022 3300 33 478 5 53 27 127 886 1100 11 159 5 10 471 50 848 3350 33 5 485 75 53 935 129 083 1150 11 5 166 75 11 988 53 578 3400 34 493 54 593 130 267 1200 12...

Page 58: ...Unit Sizes 12 115V and 6 12K 208 230V Panel Plate NOTE This part is for reference only and the photos may differ from your actual unit Procedure Illustration 1 Turn off the air conditioner and the po...

Page 59: ...ns without notice and without obligations 59 Procedure Illustration 4 Remove the water collecting cover screws 2 then remove the water collecting cover 5 Remove the front panel screws and then remove...

Page 60: ...Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 60 Procedure Illustration 6 Remove the right panel screws 5 then remove the rig...

Page 61: ...es 18K 208 230V Panel Plate NOTE This part is for reference only and the photos may differ from your actual unit Procedure Illustration 1 Turn off the air conditioner and the power breaker 2 Remove th...

Page 62: ...gns without notice and without obligations 62 Procedure Illustration 4 Remove the water collecting cover screws 2 then remove the water collecting cover 5 Remove the front panel screws then remove the...

Page 63: ...Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 63 Procedure Illustration 6 Remove the right panel screws 6 then remove the rig...

Page 64: ...24 36K 208 230V Panel Plate NOTE This part is for reference only and the photos may differ from your actual unit Procedure Illustration 1 Turn off the air conditioner and the power breaker 2 Remove t...

Page 65: ...time specifications and designs without notice and without obligations 65 Procedure Illustration 4 Remove the front right panel screws 2 and then remove the front right panel 5 Remove the front panel...

Page 66: ...t any time specifications and designs without notice and without obligations 66 Procedure Illustration 6 Remove the water collecting cover screws 2 then remove the water collecting cover 7 Remove the...

Page 67: ...Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 67 Procedure Illustration 8 Remove the right panel screws 8 then remove the rig...

Page 68: ...d without obligations 68 ELECTRICAL PARTS PCB Board 12K 115V Procedure Illustration 1 Disconnect the compressor connector and release the ground wire 1 screw 2 Pull out the wires from the electrical s...

Page 69: ...ht to change at any time specifications and designs without notice and without obligations 69 Procedure Illustration 4 Remove the board 2 hooks 5 Disconnect the connectors from the electronic control...

Page 70: ...ce and without obligations 70 PCB Board 6K 12K 208 230V Procedure Illustration 1 Disconnect the compressor connector and release the ground wire 1 screw 2 Pull out the wires from the electrical suppor...

Page 71: ...ht to change at any time specifications and designs without notice and without obligations 71 Procedure Illustration 4 Remove the board 2 hooks 5 Disconnect the connectors from the electronic control...

Page 72: ...box cover 5 screws and 2 hooks 2 Disconnect the fan motor connector motor from the electronic control board 3 Remove the compressor connector 4 Pull out the two blue wires connected with the four way...

Page 73: ...ecifications and designs without notice and without obligations 73 PCB Board 24K 36K 208 230V Procedure Illustration 1 Loosen the hooks 4 then open the electronic control box cover 2 Remove the screws...

Page 74: ...cturer reserves the right to change at any time specifications and designs without notice and without obligations 74 Procedure Illustration 3 Pull out the connectors 4 Remove the 4 screws then remove...

Page 75: ...nd without obligations 75 Fan Assembly Fan Motor NOTE Remove the panel plate and the connection of fan motor on PCB before disassembling fan motor Procedure Illustration 1 Remove the nut securing the...

Page 76: ...turer reserves the right to change at any time specifications and designs without notice and without obligations 76 Sound Blanket Procedure Illustration 1 Remove the sound blanket side and top Sound B...

Page 77: ...rant left in the system before removing the four way valve and the compressor For R32 R290 evacuate the system with the vacuum pump flush the system with nitrogen then repeat the two steps before heat...

Page 78: ...confirm that there is no refrigerant left in the system before removing the four way valve and the compressor For R32 R290 you should evacuate the system with the vacuum pump flush the system with ni...

Page 79: ...tice and without obligations 79 Procedure Illustration 3 Remove the hex nuts and washers securing the compressor located on the bottom plate 4 Heat up the brazed parts and then remove the discharge pi...

Page 80: ...oltage is lower than 36V the capacitors are fully discharged Fig 45 Testing Be sure to turn off all the power supplies or disconnect all wires to avoid electric shock While checking the indoor or outd...

Page 81: ...36 97 6 13059 76 169 1 34105 116 241 0 4006 3 27 41 5878 37 99 5 87359 77 171 1 29078 117 243 0 38991 2 28 39 8239 38 100 5 62961 78 172 1 25423 118 244 0 37956 1 30 37 1988 39 102 5 39689 79 174 1 2...

Page 82: ...37 3 74 165 8 358 114 237 2 489 5 23 234 9 35 95 35 78 75 167 8 084 115 239 2 422 4 25 222 8 36 97 34 32 76 169 7 82 116 241 2 357 3 27 211 4 37 99 32 94 77 171 7 566 117 243 2 294 2 28 200 7 38 100 3...

Page 83: ...4 3 37 4 31 87 8 62 143 6 93 199 4 124 255 2 3 5 38 3 32 89 6 63 145 4 94 201 2 125 257 4 39 2 33 91 4 64 147 2 95 203 126 258 8 4 5 40 1 34 93 2 65 149 96 204 8 127 260 6 5 41 35 95 66 150 8 97 206...

Page 84: ...ed A Carrier Company Edition Date 07 21 Catalog No SG 38MARB 02 Replaces SG 38MARB 01 38MARB Service Manual Manufacturer reserves the right to change at any time specifications and designs without not...

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