Midea MCH2U-18PHH2 Service Manual Download Page 107

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107

Remove the IPM board.

Disconnect the

connectors and wires

connected from PCB and other

parts.

Connectors:

CN17:T3/T4 temperature sensor

(2p/2p,white)

CN7: Discharge temperature sensor

(2p,white)

CN15:T2B-A,B temperature sensor

(2p/2p,white)

CN18/CN19: Electronic expansive

valve A,B (6p/6p,red/red)

CN25/CN23: S-A,S-B

(3p/3p,white/white)

Wires:

CN1/CN2: 4-way valve (blue-blue)

CN5/CN6: Crankcase heating cable

(red-red)

CN3:L-IN (red)

CN4:N-IN (black)

Disconnect the

grounding wire (yellow-green)

after removing the big handle

and the right-rear panel.

9) Remove the PCB board.

⑧

CN17

CN7

CN15

CN1/CN2

CN5/CN6

CN3

CN4

CN18/CN19 CN25/CN23

Summary of Contents for MCH2U-18PHH2

Page 1: ...for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments Installation or repairs made by unqualified persons can result in haza...

Page 2: ...rvicing the indoor unit refrigeration circuit 12 4 7 Evacuation after servicing the outdoor unit refrigeration circuit 14 6 Electronic Function 15 6 1 Abbreviation 15 6 2 Electric Control Working Envi...

Page 3: ...3 MCH4U 36PHH2 WD30 metal plate 118 MCH5U 48PHH2 WE30 metal plate 125...

Page 4: ...8 12 12 24 12 18 18 12 18 24 12 24 24 18 18 18 18 18 24 9 9 9 9 9 9 9 12 9 9 9 18 9 9 9 24 9 9 12 12 Multi DC Outdoor Unit Nominal capacity Suggested Combination Limit 1drive 3 7 8kW 9 9 None 9 12 9 1...

Page 5: ...12 12 9 12 12 18 9 12 12 24 9 12 18 18 9 18 18 18 12 12 12 12 12 12 12 18 12 12 12 24 12 12 18 18 9 9 9 9 9 9 9 9 9 12 9 9 9 9 18 9 9 9 9 24 9 9 9 12 12 9 9 9 12 18 9 9 9 18 18 9 9 12 12 12 9 9 12 12...

Page 6: ...923 540 350 inch 33 3 14 3 27 6 36 0 21 3 13 8 MCH3U 27PHH2 mm 946 410 810 1034 673 403 inch 37 2 16 5 31 9 40 6 26 5 15 9 MCH4U 36PHH2 mm 946 410 810 1034 673 403 inch 37 2 16 5 31 9 40 6 26 5 15 9 M...

Page 7: ...ILIARY B LIQUID VALVE B GAS VALVE B Accumulator T2B A Evaporator temp sensor outlet T2B B 3 2 Refrigeration circuit drawing of inverter 1 drive 3 type LIQUID VALVE A GAS VALVE A HEAT EXCHANGE EVAPORAT...

Page 8: ...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...

Page 9: ...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 EXV E CAPIL...

Page 10: ...l refrigerant charge 1 drive 2 1 drive 3 1 drive 4 1 drive 5 Pre charge pipe length m 15 49 2ft 22 5 73 8ft 30 98 4ft 37 5 123ft Additio nal refriger ant charge g 15 x length for all rooms 15 15 x len...

Page 11: ...h the push pin of the Handle Lo to the 3 way valve gas service port 3 Connect the charge hose of the Handle Hi to the vacuum pump 4 Fully open the Handle Lo of the manifold valve 5 Turn on the vacuum...

Page 12: ...for gas leaks 4 5 Adding Refrigerant after Long Term System Operation Procedure 1 Connect the charge hose to the 3 way service port and open the 2 way and 3 way valve Connect the charge hose to the va...

Page 13: ...re to check for gas leakage 2 Air purging with vacuum pump 1 Completely tighten the flare nuts of the indoor and outdoor units confirm that both the 2 way and 3 way valves are set to the closed positi...

Page 14: ...acuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom...

Page 15: ...door heat exchanger pipe temperature T4 Outdoor ambient temperature T5 Compressor discharge temperature 6 2 Electric Control Working Environment 6 2 1 Input voltage 230V 6 2 2 Input power frequency 60...

Page 16: ...sm has turned off 6 3 5 Low Voltage Protection VOLTAGE No lim it VOLT_LTM _FREQ1_ADD VOLT_LTM _FR EQ2_ADD Note If low voltage protection triggers and voltage is not restored to normal within 3 minutes...

Page 17: ...and resumes normal operation when T2 8 and the protection time is no less than 3 minutes 6 3 10 Oil Return Rules for Operation 1 If the compressor frequency continues to be lower than the frequency se...

Page 18: ...ty demand 0 1 2 24 25 The maximum running frequency is adjusted according to the outdoor ambient temperature 55 54 Fmax T4FREMAXC0 51 5 50 5 Fmax T4FREMAXC1 45 5 44 5 Fmax T4FREMAXC2 39 38 Fmax T4FREM...

Page 19: ...erature 34 33 Standby 28 27 Fmax T4FREHEATMAX1 25 24 Fmax T4FREHEATMAX2 22 21 Fmax T4FREHEATMAX3 19 18 Fmax T4FREHEATMAX4 17 16 Fmax T4FREHEATMAX5 15 14 Fmax T4FREHEATMAX6 12 11 Fmax T4FREHEATMAX7 6 5...

Page 20: ...rol off 480P 480P for 240s Condition of ending defrosting If any one of following items is satisfied defrosting will stop and the machine will turn to normal heating mode T3 TempQuitDefrost_ADD The de...

Page 21: ...ins fully closed while the device is powering up EXV then remains on standby with 350P open It opens to the target angle after the compressor starts 2 EXV closes with 160P when the compressor stops Th...

Page 22: ...oor unit s T2 with the average the outdoor gives the following modification commands If the T2 average 2 the relevant valve needs to close 16p more If average 2 the T2 average 2 the relevant valve s o...

Page 23: ...23 7 Wiring Diagrams 7 1 Wiring diagram of 1 drive 2 outdoor MCH2U 18PHH2...

Page 24: ...24 7 2 Wiring diagram of 1 drive 3 outdoor MCH3U 27PHH2...

Page 25: ...25 7 3 Wiring diagram of 1 drive 4 outdoor MCH4U 36PHH2...

Page 26: ...26 7 4 Wiring diagram of MCH5U 48PHH2...

Page 27: ...29 N OUT CN28 CN12 CompTop FUSE1 T5A 250VAC R120 LED1 P 2 GND CN3 L IN R117 R118 D33 D32 D31 R64 R49 R40 R29 IC13 IC12 IC10 IC8 IC7 IC5 IC4 IC2 C45 C36 C34 C29 C27 C19 C18 D34 C42 D14 CN4 N IN power s...

Page 28: ...14 IC13 IC12 IC11 IC9 IC8 IC7 IC4 IC1 C100 C101 C4 C95 C96 C97 C98 E14 E13 E12 E11 E9 E8 C102 E4 E1 DZ5 DZ1 D19 D13 D12 D11 D6 D3 D1 C78 C77 C76 C75 C74 C73 C72 C71 C70 C69 C68 C67 C 6 6 C65 C64 C 62...

Page 29: ...C21 C20 C19 C17 C16 C15 C14 C13 C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 JP1 JP2 D29 D30 CN23 SSR1 CN7 CN13 P 1 L1 R82 R83 R84 R85 R86 R87 R97 R119 R122 R132 CN35 N CN37 FAN L Q3 Q6 Q7 Q8 Q9 CN36 FAN H...

Page 30: ...256 IC14 24C08 IC10 IC7 IC4 IC2 E34 E33 E27 E25 E24 E 22 E21 E20 E17 E16 E15 E14 E13 E12 E10 E9 E8 E7 E6 E5 E4 E1 DZ9 DZ8 DZ7 DZ6 DZ1 D26 D14 D13 D12 D11 D10 D9 D8 D6 D5 D4 D3 D2 CN57 1 CN56 CN54 L IN...

Page 31: ...31 PCB board of MCH5U 48PHH2...

Page 32: ...32 IPM board of MCH5U 48PHH2...

Page 33: ...Do not forget to discharge the electricity in the capacitors The value of resistance is about 1500 ohm to 2000 ohm Electrolytic Capacitors HIGH VOLTAGE CAUTION Bulb 25 40W The voltage in P3 and P4 in...

Page 34: ...unction or Outdoor unit EEPROM parameter error X Compressor top high temperature protection OLP X Compressor drive protection X Indoor units mode conflict Indoor fan speed malfunction X X In standby m...

Page 35: ...tdoor units error E1 Zero crossing signal detection error E2 Indoor fan speed malfunction E3 X X Outdoor temperature sensor coil sensor T3 or ambient temperature sensor T4 malfunction or Outdoor unit...

Page 36: ...times F7 Communication malfunction between Cassette optional lift panel and the unit 9 times F8 Cassette optional lift panel malfunction 10 times F9 Cassette optional lift panel not closed 1 times P0...

Page 37: ...t coil outlet temp sensor malfunction F6 No F Indoor unit coil outlet temp sensor malfunction P1 High pressure protection P2 P2 Low pressure protection P2 P3 Current overload protection F0 P4 Temperat...

Page 38: ...1 Cooling 2 Heating 3 Forced cooling 4 Forced defrost A 3 Indoor unit A capacity The capacity unit is horse power If the indoor unit is not connected the digital display shows the following 9K 1HP 12...

Page 39: ...higher than 70 the digital display shows 70 If the indoor unit is not connected the digital display shows 28 Indoor unit B evaporator temperature T2B 29 Indoor unit C evaporator temperature T2C 30 In...

Page 40: ...Unit Digital Display A digital display is featured on the outdoor PCB The LED displays different codes in the following situations Standby Compressor operation the running frequency Defrosting mode dF...

Page 41: ...6 PFC module protection E8 Outdoor fan speed malfunction F5 F1 No A Indoor unit coil outlet temp sensor malfunction F2 No B Indoor unit coil outlet temp sensor malfunction F3 No C Indoor unit coil out...

Page 42: ...or PCB main chip does not receive feedback from EEPROM chip Potential causes Installation mistake Faulty PCB Trouble shooting Yes Replace the indoor outdoor main PCB Power off then restart the unit 3...

Page 43: ...etween indoor and outdoor units diagnosis and solution Malfunction conditions If indoor unit does not receive the feedback from outdoor unit during 120 seconds Potential causes Wiring mistake Faulty i...

Page 44: ...44...

Page 45: ...tage between 2 old L2 port and S port of outdoor unit The red pin of multimeter connects with 2 old L2 port while the black pin is for S port When AC is normal running the voltage will move alternatel...

Page 46: ...46 Operating Standby Pic 2 IPM for 2 zone 3 zone...

Page 47: ...47 PIC3 Main board LED when power on and unit standby Pic 2 IPM for5 zone Power Standby Operating...

Page 48: ...o crossing signal time interval is abnormal Potential causes Connection mistake Faulty PCB Trouble shooting Check if the connections and power supply is normal Correct the connections Turn on the unit...

Page 49: ...ution Malfunction conditions When indoor fan speed is too low 300RPM for a certain period of time the unit ceases operation and the LED displays a failure code Potential causes Wiring mistake Faulty f...

Page 50: ...nd need to be replaced 2 Indoor DC fan motor control chip is inside 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...

Page 51: ...the LED displays a failure Potential causes Wiring mistake Faulty sensor Faulty PCB Trouble shooting Check the connections between temperature sensor and PCB Are the connections good Correct the conne...

Page 52: ...ion conditions When the voltage signal that IPM send to compressor drive chip is abnormal the display LED will show P6 and AC will turn off Potential causes Wiring mistake IPM malfunction Faulty outdo...

Page 53: ...No Replace the compressor 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...

Page 54: ...54 8 4 1 7 Over voltage or under voltage protection diagnosis and solution...

Page 55: ...ame with one of IPM module protection 8 4 1 9 Water level alarm malfunction diagnosis and solution Malfunction conditions If the sampling voltage is not 5V the LED will display the failure code Potent...

Page 56: ...in cooling mode or fan mode and indoor unit B is set to heating mode then A will change to off and B will work in heating mode Suppose Indoor unit A working in heating mode and indoor unit B is set t...

Page 57: ...ential causes Installation mistake Faulty PCB Trouble shooting Yes Replace the outdoor main PCB Replace the outdoor main PCB Power off then restart the unit 3 minutes later Power off then restart the...

Page 58: ...ution Error Code E2 Malfunction conditions Indoor unit does not receive the feedback from outdoor unit during 120 seconds or outdoor unit does not receive the feedback from any one indoor unit during...

Page 59: ...59...

Page 60: ...tage between 2 old L2 port and 3 port of outdoor unit The red pin of multimeter connects with 2 old L2 port while the black pin is for 3 port When AC is normal running the voltage will move alternatel...

Page 61: ...61 Operating Standby Pic 2 IPM board for 2 zone 3 zone...

Page 62: ...62 PIC3 Main board LED when power on and unit standby Pic 2 IPM for5 zone Power Standby Operating...

Page 63: ...ntrol board diagnosis Error Code E3 Malfunction conditions PCB main chip does not receive feedback from IPM module during 60 seconds Potential causes Wiring mistake Faulty PCB Trouble shooting PIC 4 C...

Page 64: ...64...

Page 65: ...o test the DC voltage between black pin and white pin of signal wire The normal value should be around 5V Use a multimeter to test the DC voltage between black pin and red pin of signal wire The norma...

Page 66: ...on diagnosis and solution F1 F2 F3 F4 F5 No A B C D E Indoor unit coil outlet temp sensor malfunction diagnosis and solution Error Code E4 F1 F2 F3 F4 F5 Malfunction conditions If the sampling voltage...

Page 67: ...Check the voltage of outdoor unit power supply whether the voltage between L L1 and N L2 is about 187 264VAC Check the power supply Check whether the voltage of IPM board P and N GND is normal DC277...

Page 68: ...68 IPM board for 2 zone 3 zone...

Page 69: ...2 E3 N GND for 2 zone 3 zone Bridge rectifier for 2 zone 3 zone Bridge rectifier for 2 zone 3 zone IPM Module for 2 zone 3 zone Remark Measure the DC voltage between and port The normal value should b...

Page 70: ...70 IPM board for 4 zone...

Page 71: ...71 IPM board for 5 zone Bridge rectifier for 5 zone Remark Measure the DC voltage between and port The normal value should be 190V 250V IPM Module for 5 zone...

Page 72: ...e E6 Malfunction conditions When the voltage signal that PFC sends to main control board is abnormal the display LED will show E6 and AC will turn off Potential causes Wiring mistake Faulty outdoor PC...

Page 73: ...73 Two ports of the inductance Inductance...

Page 74: ...ror Code E8 Malfunction conditions When outdoor fan speed keeps too low 300RPM or too high 2400RPM for certain time the unit will stop and the LED will display the failure Potential causes Wiring mist...

Page 75: ...in1 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 have problems and need to be replaced DC motor voltage input and output NO...

Page 76: ...76 Vs Vcc Vsp FG...

Page 77: ...n diagnosis and solution Error Code P1 Malfunction conditions If the sampling voltage is not 5V the LED will display the failure Potential causes Wiring mistake Faulty over load protector System block...

Page 78: ...78...

Page 79: ...79...

Page 80: ...n diagnosis and solution Error Code P2 Malfunction conditions If the sampling voltage is not 5V the LED will display the failure Potential causes Wiring mistake Faulty over load protector System block...

Page 81: ...81...

Page 82: ...82...

Page 83: ...sis and solution Error Code P3 Malfunction conditions If the outdoor current exceeds the current limit value the LED will display the failure Potential causes Wiring mistake Faulty over load protector...

Page 84: ...84...

Page 85: ...85...

Page 86: ...ode P4 Malfunction conditions When the compressor discharge temperature T5 is more than 115 for 10 seconds the compressor will stop and restart till T5 is less than 90 Potential causes Refrigerant lea...

Page 87: ...87...

Page 88: ...n Error Code P5 Malfunction conditions When outdoor pipe temperature is more than 65 C the unit will stop and unit runs again when outdoor pipe temperature is less than 52 C Potential causes Faulty co...

Page 89: ...Malfunction conditions When the voltage signal that IPM send to compressor drive chip is abnormal the display LED will show P6 and AC will turn off Potential causes Wiring mistake IPM malfunction Fau...

Page 90: ...er 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 r...

Page 91: ...or unit Model 9k Oasis 12k Oasis 18k Oasis 24k Oasis Indoor fan motor WZDK20 38G WZDK20 38G WZDK58 38G WZDK60 38G Model MEHSU 09CHD2 MEHSU 12CHD2 MEHSU 18CHD2 MEHSU 24CHD2 Indoor fan motor WZDK55 38GS...

Page 92: ...B 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...

Page 93: ...6 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...

Page 94: ...5 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 1...

Page 95: ...25 26 27 28 29 30 31 32 33 34 35 74 76 78 80 82 84 86 88 90 92 94 96 98 2 Compressor check Measure the resistance value of each winding by using the tester Position Resistance Value ATM150D23UFZ ATF2...

Page 96: ...l resistance value Red Black Several M Red Black Several M P N U N U V V W W Red 4 AC Fan Motor Measure the resistance value of each winding by using the tester Position Resistance Value RPG20B RPG28H...

Page 97: ...8 20 Yellow Blue 76 8 20 19 8 20 252 8 20 88 8 20 150 8 20 374 3 8 20 138 8 20 5 4 way valve 1 Power on use a digital tester to measure the voltage when the unit operates in cooling it is 0V When the...

Page 98: ...98 6 EXV check Disconnect the connectors...

Page 99: ...99 Resistance to EXV coil Color of lead wire Normal Value Red Blue About 50 Red Yellow Brown Orange Brown White...

Page 100: ...100 Red Blue Red Yellow...

Page 101: ...101 Brown Orange...

Page 102: ...102 Brown White...

Page 103: ...A30 metal plate No Part name Procedures Remarks 1 Fan assembly How to remove the fan assembly 1 Turn off the air conditioner and turn off the power breaker 2 Remove the screws of air outlet grille 4 s...

Page 104: ...the fan motor connector CN14 3p white from the IPM board 8 Remove the fan motor after unfastening four fixing screws 2 Panel plate How to remove the panel plate 1 Remove the screws of front panel and...

Page 105: ...and remove the big handle 4 screws 3 Remove two screws of terminal board and seven screws of right rear panel and remove the right rear panel Screws of big handle Screws of terminal board Screws of r...

Page 106: ...ws fixing the IPM board 3 Unfasten the connector of the reactor 4 Unfasten the connector of the compressor 5 Disconnect following 3 pieces of connection wires and connectors between IPM and main contr...

Page 107: ...temperature sensor 2p 2p white CN18 CN19 Electronic expansive valve A B 6p 6p red red CN25 CN23 S A S B 3p 3p white white Wires CN1 CN2 4 way valve blue blue CN5 CN6 Crankcase heating cable red red C...

Page 108: ...s 4 Remove the sound insulation material and crankcase heating cable 5 Remove terminal cover of compressor and disconnect wires of crankcase electric heater and compressor from the terminal 6 Remove t...

Page 109: ...109 5 Reactor How to remove the reactor 1 Perform work of item 2 2 Unfasten the connector between IPM and reactor 3 Remove three screws of reactor and remove the reactor Screws of cover of inductance...

Page 110: ...e 7 The expansion valve How to remove the expansion valve 1 Perform work of item 1 2 2 Remove the electrical parts from item 3 3 Remove the coils 4 Detach the welded parts of expansion valves and pipe...

Page 111: ...front side panel and remove the right front side panel 1 screws 5 Remove the screws of front panel and remove the front panel 8 screws 6 Remove two screws of terminal board screws of water collector...

Page 112: ...112 Screws of front panel Screws of right rear panel Screws of front panel...

Page 113: ...bly 1 Remove the top cover right front side panel and front panel from item 1 step 1 4 2 Remove the hex nut fixing the fan 3 Remove the fan 4 Remove the cover of electrical control box cover 5 Disconn...

Page 114: ...ctrical parts How to remove the electrical parts 1 Perform work of item 1 2 2 Remove the four screws fixing the IPM board 3 Unfasten the connector of the reactor 4 Unfasten the connector of the compre...

Page 115: ...CN17 T3 T4 temperature sensor 2p 2p white CN7 Discharge temperature sensor 2p white CN12 Ttop temperature sensor 2p white CN15 T2B A B C temperature sensor 2p 2p 2p white CN18 CN19 CN22 Electronic ex...

Page 116: ...Remove the PCB board 4 Compressor How to remove the compressor 1 Perform work of item 1 2 3 2 Remove the electrical control box and partition plate 3 Extract refrigerant gas 4 Remove the sound insulat...

Page 117: ...or 1 Perform work of item 1 2 2 Unfasten the connector between IPM and reactor 3 Remove two screws of cover of inductance and remove the cover of inductance 4 Disconnect two pieces of wires connected...

Page 118: ...arts of 4 way valve and pipe 7 The expansion valve How to remove the expansion valve 1 Perform work of item 1 2 2 Remove the electrical parts from item 3 3 Remove the coils 4 Detach the welded parts o...

Page 119: ...ight front side panel and remove the right front side panel 1 screw 5 Remove the screws of front panel and remove the front panel 8 screws 6 Remove two screws of terminal board screws of water collect...

Page 120: ...120 Screws of front panel Screws of right rear panel Screws of front panel...

Page 121: ...nt side panel and front panel from item 1 step 1 4 2 Remove the hex nut fixing the fan 3 Remove the fan 4 Unfix the hooks and remove the screws then open the electronic control box 5 Disconnect the fa...

Page 122: ...of the reactor 3 Unfasten the connector of the compressor 4 Unfasten the connector of the PFC inductor 5 Disconnect following 3 pieces of connection wires and connectors between driver board and PCB C...

Page 123: ...p red red red CN30 CN29 CN28 CN27 S A S B S C S D 3p 3p 3p 3p white CN9 High and low pressure switch 2p 2p white Wires CN3 CN22 4 way valve blue blue CN4 CN40 Crankcase heating cable black red CN10 CN...

Page 124: ...igerant gas 4 Remove the sound insulation material and crankcase heating cable 5 Remove terminal cover of compressor and disconnect wires of compressor thermo and compressor from the terminal 6 Remove...

Page 125: ...etach the welded parts of 4 way valve and pipe 6 The expansion valve How to remove the expansion valve 1 Perform work of item 1 2 2 Remove the electrical parts from item 3 3 Remove the coils 4 Detach...

Page 126: ...of air outlet grille 8 screws 3 Remove the hex nut fixing the fan 4 Remove the fan 5 Remove the screws of top cover and remove the top cover 4 screws 6 Remove the screws of front side panel and remov...

Page 127: ...unfastening fixing screws 2 Panel plate How to remove the panel plate 4 Remove big handle 2 screws and water collector 2 screws 5 Remove 2 screws of terminal board and 15 screws of right rear panel a...

Page 128: ...ollowing 8 pieces of connection wires and connectors between IPM and other parts CN2 yellow CN1 red CN6 black CN3 yellow U V W black CN9 10p white 4 Remove the fixing screws then remove the IPM board...

Page 129: ...c expansive valve 6p 6p 6p 6p 6p red CN37 CN29 CN21 CN16 CN13 S A S B S C S D S E 3p 3p 3p 3p 3p white CN10 High and low pressure switch 2p 2p white Wires CN17 CN18 4 way valve blue blue CN19 CN20 con...

Page 130: ...sound insulation material and crankcase heating cable 4 Remove terminal cover of compressor and disconnect wires of crankcase electric heater and compressor from the terminal 5 Remove the discharge p...

Page 131: ...e electrical parts from item 3 9 Remove fixing screw of the coil and remove the coil 10 Detach the welded parts of 4 way valve and pipe 6 The expansion valve How to remove the expansion valve 5 Perfor...

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Midea MCH2U-18PHH2, Service Manual

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