Midea DLCMB Service Manual

Multi-zone outdoor unit ductless system

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DLCM(R/H)B

Multi-zone Outdoor Unit Ductless System

Sizes 18R, 24HH, 30HH, 36R, 36HH, 48R and 48HH

Advanced Ideal Air Conditioning

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Summary of Contents for Midea DLCMB

Page 1 DLCM(R/H)B Multi-zone Outdoor Unit Ductless System Sizes 18R, 24HH, 30HH, 36R, 36HH, 48R and 48HH Advanced Ideal Air Conditioning...
Page 2 DLCMRBH18BAK DLCMHBH24CAK DLCMHBH30DAK DLCMRBH36DAK DLCMHBH36DAK DLCMRBH48EAK DLCMHBH48EAK...
Page 3 DLCM(R/H)B: Service Manual...
Page 4 DLCM(R/H)B: Service Manual Field Power Supply...
Page 5 DLCM(R/H)B: Service Manual FIELD POWER SUPPLY FIELD POWER SUPPLY...
Page 6 DLCM(R/H)B: Service Manual FIELD POWER SUPPLY FIELD POWER SUPPLY...
Page 7 DLCM(R/H)B: Service Manual LED display Correct Terminal block Indoor unit B Liquid/ Gas Pipe Indoor unit A Outdoor unit Incorrect wiring Terminal block Indoor unit B Liquid/ Gas Pipe Indoor unit A Outdoor unit Incorrect wiring Terminal block Indoor unit B Liquid/ Gas Pipe Indoor unit A...
Page 8: Dc Fan Motor
DLCM(R/H)B: Service Manual DC FAN MOTOR INDOOR COIL OUTLET TEMP. SENSOR(T2B) Connect to FAN U~V~W among voltage among phases 0~250VAC COMP TOP phases 0~200VAC CN32 CN29 CN26 CN30 CN28 CN16 CN13 Input:0-5VDC Input:0-5VDC Input:0-5VDC Input:0VDC Output:12VDC CN20 Output:230 VAC MAIN CONTROL BOARD CN21 Output:230 VAC CN36...
Page 9 DLCM(R/H)B: Service Manual...
Page 10 DLCM(R/H)B: Service Manual MAIN CONTROL BOARD CN20,CN23,CN25 Output:230VAC High voltage----REVERSE VALVE Output:230VAC High voltage----CRANKCASE HEATER Output:230VAC High voltage----CHASSIS HEATER CN18,CN19,CN22 IPM DRIVE BOARD...
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Page 12 DLCM(R/H)B: Service Manual MAIN CONTROL BOARD CN16,CN20, CN23,CN25 Output:230VAC High voltage----REVERSE VALVE Output:230VAC High voltage----CRANKCASE HEATER Output:230VAC High voltage----CHASSIS HEATER CN18,CN19, CN22,CN24 Input:Pin1,Pin3,Pin5,Pin7(5VDC) Pin2,Pin4,Pin6,Pin8(0-5VDC)--IDU Pipe Temp IPM DRIVE BOARD...
Page 13 DLCM(R/H)B: Service Manual BLACK BLACK BLACK IPM&PFC BOARD MAIN CONTROL BOARD BLACK BLUE CN16 BROWN BLACK BLACK BLUE BLUE CN21 BROWN W V U COMP BLACK BLUE CN29 DCFAN1 DCFAN2 BROWN BLACK BLUE CN37 BROWN ELECTRONIC EXPANSION VALVE A CN15 A BLACK CN20 HEAT_D...
Page 14 DLCM(R/H)B: Service Manual MAIN CONTROL BOARD Input:230VAC High voltage CN1~CN3 Output:Pin1(Connection of the high voltage)”S” CN16 CN21 CN29 Pin2~Pin3(230VAC High voltage)”L1&L2” CN37 P5 P6 Connection to the earth Output:230VAC High voltage----REVERSING VALVE CN17~CN18 CN24~CN25 Output:230VAC High voltage----CRANKCASE HEATER Output:230VAC High voltage----CHASSIS HEATER CN19~CN20 CN11 Input:Pin1,Pin3,Pin5,Pin7,Pin9(5VDC)
Page 15 DLCM(R/H)B: Service Manual BLACK BLACK BLACK IPM&PFC BOARD BLACK BLUE CN13 BROWN MAIN CONTROL BOARD BLACK BLUE CN16 BROWN BLACK BLACK BLUE CN21 BLUE BROWN W V U COMP BLACK BLUE CN29 BROWN DCFAN1 DCFAN2 BLACK BLUE CN37 BROWN ELECTRONIC EXPANSION VALVE A CN15 A BLACK CN20...
Page 16 DLCM(R/H)B: Service Manual MAIN CONTROL BOARD Input:230VAC High voltage CN1~CN3 Output:Pin1(Connection of the high voltage)”S” CN13 CN16 CN21 CN29 Pin2~Pin3(230VAC High voltage)”L1&L2” CN37 P5 P6 P9 Connection to the earth Output:230VAC High voltage----REVERSING VALVE CN17~CN18 CN24~CN25 Output:230VAC High voltage----CRANKCASE HEATER Output:230VAC High voltage----CHASSIS HEATER CN19~CN20 CN11...
Page 17 DLCM(R/H)B: Service Manual BLACK BLACK BLACK OPTIONAL BLACK IPM&PFC BOARD BLUE BLACK W V U BLUE CN13 COMP BROWN BLACK BLUE DCFAN1 DCFAN2 CN16 BROWN BLACK BLUE CN21 BROWN Outdoor main Controller BLACK BLACK CN1-3 BLUE Applicable to the units adopting CN29 BLUE CN1-2...
Page 18 DLCM(R/H)B: Service Manual MAIN CONTROL BOARD Input:230VAC High voltage CN1~CN3 Output:Pin1(Connection of the high voltage)”S” CN13 CN16 CN21 CN29 Pin2~Pin3(230VAC High voltage)”L1&L2” CN37 P5 P6 P9 Connection to the earth Output:230VAC High voltage----REVERSING VALVE CN17~CN18 Output:230VAC High voltage----CRANKCASE HEATER CN24~CN25 Output:230VAC High voltage----CHASSIS HEATER CN19~CN20 CN11...
Page 19 DLCM(R/H)B: Service Manual EXV A LIQUID VALVE A EXV B LIQUID VALVE B CAPILLARY TUBE Condenser temp. sensor HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE temp. sensor temp. sensor (CONDENSER) T2B-A Evaporator T2 Evaporator temp. sensor outlet GAS VALVE A temp.
Page 20 DLCM(R/H)B: Service Manual INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B EXV C LIQUID VALVE C CAPILLARY TUBE Condenser EXV D temp. sensor LIQUID VALVE D HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE temp. sensor temp.
Page 21 DLCM(R/H)B: Service Manual INDOOR OUTDOOR EXV A LIQUID VALVE A EXV B LIQUID VALVE B EXV C LIQUID VALVE C CAPILLARY TUBE EXV D Condenser LIQUID VALVE D temp. sensor EXV E LIQUID VALVE E HEAT EXCHANGE HEAT T1 Room T4 Ambient (EVAPORATOR) EXCHANGE...
Page 22 DLCM(R/H)B: Service Manual...
Page 23 DLCM(R/H)B: Service Manual Manifold Gage 500 microns Low side valve High side valve Charge hose Charge hose Vacuum pump Low side valve 5000 4500 4000 LEAK IN 3500 SYSTEM 3000 2500 2000 VACUUM TIGHT 1500 TOO WET 1000 TIGHT DRY SYSTEM MINUTES...
Page 24 DLCM(R/H)B: Service Manual EVACUATE TO 1500 MICRONS BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG EVACUATE TO 1000 MICRONS BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG EVACUATE TO 500 MICRONS MINIMUM (HOLD FOR 30 MINUTES) CHECK FOR TIGHT, DRY SYSTEM (IF IT HOLDS DEEP VACUUM) RELEASE CHARGE INTO SYSTEM BY OPENING VALVES COMPLETELY VOLTAGE...
Page 25 DLCM(R/H)B: Service Manual Decrease Hold Resume Heatr4Zone4I Heatr4Zone3I Heatr4Zone2I Heatr4Zone1I T1 Ts...
Page 26 DLCM(R/H)B: Service Manual T1 Ts T4FREMAXC0 °C T2 average Decrease frequency Keep frequency Increase frequency...
Page 27 DLCM(R/H)B: Service Manual °C Exit low ambient cooling mode run with high fan for 1 minute compressor Max 10 minutes frequency Cool-F9 frequency Compressor stops TimeA 10S 30S Indoor fan Outdoor fan EXV open P 0 8 4 s 0 4 2 r o f P 0 8 4...
Page 28 DLCM(R/H)B: Service Manual Increase fan speed Keep current fan speed Decrease fan speed Fan stop...
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Page 37 DLCM(R/H)B: Service Manual Power off, then restart the unit 3 minutes later. Does a problem still remain? Replace the indoor/outdoor main PCB.
Page 38 DLCM(R/H)B: Service Manual Indoor / outdoor units communication error Start: Power oﬀ , then Power on the A/C by the Breaker. (Reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all Reconnect the wiring connecting correctly? Reconnect the wiring...
Page 39 DLCM(R/H)B: Service Manual Operating Standby...
Page 40 DLCM(R/H)B: Service Manual PIC2: IPM (for 4 zone and 5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. PIC 4: Check point button, press 1 time for check how many indoor units are connected.
Page 41 DLCM(R/H)B: Service Manual Are the connections and Check the connections. Replace power supply normal? power supply if necessary. Turn on the unit. Indoor main PCB is defective. Replace indoor main PCB.
Page 42 DLCM(R/H)B: Service Manual Power off and restart the unit after 3 minutes. Does The unit is operating normally the problem remain? Shut off the power supply. Find the cause of the . . d problem and resolve it Does it turn easily? Check the fan motor wiring.
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Page 44 DLCM(R/H)B: Service Manual Check the connections between the temperature Correct the connections. sensor and PCB. Are the connections good? Check the resistance value of the sensor via Appendix 1 and Appendix 2. Is it normal? . . B Replace the sensor.
Page 45 DLCM(R/H)B: Service Manual IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal: power supply is correct. check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz is working normally.
Page 46 DLCM(R/H)B: Service Manual Voltage protection Check the voltage of outdoor unit power supply. Make sure the voltage Check the power supply. between L(L1) and N (L2) is about 187~253VAC. Check whether the voltage of IPM board P and N is normal: DC277-356V for 18-27KBtu/h;...
Page 47 DLCM(R/H)B: Service Manual Power off, then restart the unit 3 minutes later. Is it still displaying the error code? c t i Insert the water level switch well. inserted well? Is the water -level switch Replace the water-level switch. broken? Replace the water pump.
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Page 49 DLCM(R/H)B: Service Manual High temperature protection of IPM board Check if the heat sink is Secure the heat sink well. secure. Check if the electronic Install the electronic control control box is installed well. box correctly. Check if the thermal Coat thermal grease again grease does not have a coating or uneven coating.
Page 50 DLCM(R/H)B: Service Manual Outdoor EEPROM malfunction Power off, then restart the unit 3 minutes later Replace the outdoor main PCB...
Page 51 DLCM(R/H)B: Service Manual Operating Standby...
Page 52 DLCM(R/H)B: Service Manual PIC2: IPM (For four or five zone) Standby Power...
Page 53 DLCM(R/H)B: Service Manual Communication malfunction between IPM board and outdoor main board Is there at least one LED in the IPM board light? Check the signal wire between the IPM module and the main board. Is the connection good? Reconnect and retry. Does the error still appear? Replace IPM board, and then check whether the...
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Page 55 DLCM(R/H)B: Service Manual Check the connections between temperature Correct the connections. sensor and PCB. Are the connections good? Check the resistance value of the sensor via Appendix 1 and Appendix 2 Is it normal? Replace indoor or outdoor PCB. Replace the sensor...
Page 56 DLCM(R/H)B: Service Manual Voltage protection Check the outdoor unit’s power supply voltage. Is the voltage between Check the power supply L (L1) and N (L2) (about 187~264VAC). Check whether the voltage of IPM board P and N(GND) is normal? DC277—356V for 2-zone(18K Btu/h)/3 zone(27K Btu/h) DC277-410V For 4-zone(36K Btu/h)/5- zone(48K Btu/h)
Page 57 DLCM(R/H)B: Service Manual IPM board (for 2-zone /3-zone) Bridge rectifier (for 2-zone/3-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. P(or E1/E2/E3)-N(GND) (for 2-zone/3-zone) Bridge rectifier (for 2-zone/3-zone) IPM Module (for 2-zone/3-zone)
Page 58 DLCM(R/H)B: Service Manual IPM board (for 4-zone)
Page 59 DLCM(R/H)B: Service Manual Bridge rectifier (for 5-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. IPM board (for 5-zone) IPM Module for 5 - zone...
Page 60 DLCM(R/H)B: Service Manual PFC module protection Check whether the connecting line between main board and the PFC Connect well. module(IPM module) is connected well Check whether the voltage range of P-N on IPM Replace the outdoor main board module is normal: DC277- 356V for 18-27KBtu/h;...
Page 61 DLCM(R/H)B: Service Manual Inductance Two ports of the inductance...
Page 62 DLCM(R/H)B: Service Manual Power oﬀ, then restart the The unit operates normally. unit 3 minutes later. Is it still displaying the error code? Find the cause and x it. Shut o the power supply, For example, whether rotate the fan by hand. the fan is blocked or Does it rotate properly? the screws which secure...
Page 63 DLCM(R/H)B: Service Manual High pressure protection Is the wiring between the high pressure switch and the main control board is Connect it well connected well Is the high pressure protector broken? Method: Disconnect the plug. Method: Measure the resistance of high pressure protector, if , if Replace high pressure protector...
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Page 65 DLCM(R/H)B: Service Manual Low pressure protection Is the wiring between between the low pressure Tighten the connection protector and main control board is connected well? Is the low pressure protector broken? Method: Disconnect the plug. Method: Disconnect the plug. Measure the resistance of the Measure the resistance of the Replace the low pressure protector low pressure protector.
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Page 67 DLCM(R/H)B: Service Manual Current protec on of compressor Judge 1: Check whether the input current of the power supply wire is more than 15A(18K) (For 27K&hyper heat 18K, it is Replace outdoor main board 18.5A.For 36K&hyper heat 27K, it is 22.5A.For 48K&hyper heat 36K, it is 28A) Check whether the refrigerant system...
Page 68 DLCM(R/H)B: Service Manual Temperature protection of compressor discharge Check whether the Check whether the compressor discharge temp. is Stop the leak and add refrigerant refrigerant leaks high than 239°F (115°C) Check if the connection between the compressor discharge Correct the wiring connection temperature sensor and the PCB is correct according to the wiring diagrams.
Page 69 DLCM(R/H)B: Service Manual High temperature protection of condenser Check the connection Check the connection between temperature Correct the connection between temperature sensor and PCB. sensor and PCB. Is the condenser temperature Is the condenser higher than 149 F (65 ° °...
Page 70 DLCM(R/H)B: Service Manual IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal power supply is correct check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz can work normally DC277-410V for 36-48KBtu/h Is the connecting line between...
Page 71 DLCM(R/H)B: Service Manual Check if the air flow system Clear up the air inlet and outlet or the heat of indoor and outdoor units exchanger of indoor and outdoor units. are obstructed Turn of f the power supply and tur n back on 10 minutes later Check if all the connections, Check if the compressor top...
Page 72 DLCM(R/H)B: Service Manual Power off,then restart the unit The unit operates 2 minutes later.Is it still normally displaying the error code? Check the fan motor wiring Correct the connections Are all the connections good? Check whether the three- phase resistance of the fan is Replace the fan motor symmetrical Check the fan three-phase...
Page 73 DLCM(R/H)B: Service Manual Power off,then restart the unit The unit operates 2 minutes later.Is it still normally displaying the error code? Check both ends of the Correct the connections compressor connecting line. Are the connections good? Check whether the three- phase resistance of the Replace the compressor compressor is symmetrical...
Page 74 DLCM(R/H)B: Service Manual Power off, then restart the unit after 3 minutes. Does a problem remain? The unit is operating normally Check the wirings and connections Are all the Ensure proper connections connections good? Replace the adapter main PCB Problem solved Does the error still exist? Replace the outdoor main control board...
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Page 79 DLCM(R/H)B: Service Manual Red Brown Blue Orange Yellow White...
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Page 83 DLCM(R/H)B: Service Manual Front panel screws Handle screws Terminal board screws Right rear panel screws Right - rear panel screws...
Page 84 DLCM(R/H)B: Service Manual PCB Board IPM Board CN1(5p,white) CN14(3p,white) CN4(red or brown) CN5(blue) CN17 CN15 CN 18/CN 19 CN 25/CN 23 CN 7 CN 5/CN 6 CN 1/CN 2...
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Page 86 DLCM(R/H)B: Service Manual Inductance Cover screws Coil Welded parts Expansion valves Coils...
Page 87 DLCM(R/H)B: Service Manual Handle screws Top cover screws Top cover screws Front panel screws Front panel screws...
Page 88 DLCM(R/H)B: Service Manual Water Collector screws Terminal board screws Right side board screws...
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Page 90 DLCM(R/H)B: Service Manual Coil Welded Parts Expansion Valves...
Page 91 DLCM(R/H)B: Service Manual Handle Screws Top Cover Screws Top Cover Screws Front Panel Screws...
Page 92 DLCM(R/H)B: Service Manual Front Panel Screws Front Panel Screws Right-Rear Panel Screws Terminal Board Screws...
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Page 94 DLCM(R/H)B: Service Manual IPM Board PCB Board CN1(5p,white) CN14(3p,white) CN3(red or brown) CN5(blue) CN 20 CN 23 CN 25 CN1/CN 2 CN5/CN 6...
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Page 102 DLCM(R/H)B: Service Manual Expansion Valves Top Screws...
Page 103 DLCM(R/H)B: Service Manual Handle Screws Water Collector Screws Terminal Board Screws Right-Rear Panel Screws Right-Rear Panel Screws...
Page 104 DLCM(R/H)B: Service Manual DC Fan Driver Board IPM Board PCB Board CN2(yellow) CN1(red) CN6(black) CN3(yellow) U V W(black) CN9(10p,white)
Page 105 DLCM(R/H)B: Service Manual CN 13 CN16 CN 21 CN29 CN 37 CN 8 CN 12 CN 9 CN 11 CN 10 CN30/CN23/CN33/CN26/CN15 CN17/CN18 CN19/CN20 CN24/CN25 Coil Welded Parts...
Page 106 DLCM(R/H)B: Service Manual Expansion Valves Top Screws...
Page 107 DLCM(R/H)B: Service Manual Handle Water Collector Screws Terminal Board Screws Right-Rear Panel Screws Right-Rear Panel Screws...
Page 108 DLCM(R/H)B: Service Manual Adapter board IPM board PCB board CN3(red) CN2(black) ,V(red),W(black) CN9(10p,white) CN8,CN5(3p) CN 7 CN 13 CN16 CN 21 CN29 CN 37 CN 8 CN 12 CN 9 CN 11 CN 10 CN30/CN23...
Page 109 DLCM(R/H)B: Service Manual Coil Welded Parts Expansion Valves...
Page 110 DLCM(R/H)B: Service Manual Ai-Midea Air Conditioning Catalog No: SM-DLCMRHB-01...

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