ODMI-A-1110 SERVICE MANUAL MIDEA AIRCONDITIONER North America MARKET DC INVERTER MULTI TYPE M2OC-18HRDN1-M M3OC-27HRDN1-M M4OC-36HRDN1-M DC MULTI OUTDOOR UNITS
ODMI-A-1110 CONTENTS 1. General information of Outdoor Units ................................................. 3 2.Features.................................................................................................. 4 3. Dimensions ............................................................................................ 5 4. Wiring Diagram ...................................................................................... 6 5. Refrigeration Cycle Diagram ........................................
ODMI-A-1110 1. General information of Outdoor Units Model name Dimension (mm(in)) Compressor M2OC-18HRDN1-M 845x320x700(33.3x12.6x27.6) DA130S1C-20FZ M3OC-27HRDN1-M 845x320x700(33.3x12.6x27.6) DA150S1C-20FZ M4OC-36HRDN1-M 990x345x965(39x13.
ODMI-A-1110 2．Features Outdoor unit Power relay control Low noise air flow system Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation. Anti-rust cabinet Valve protection cover It protects the valves and prevents water from dripping.
ODMI-A-1110 3. Dimensions mm(in) Model W D H W1 A B 845((33.3) 320(12.6) 700(27.6) 908(35.7) 560(22) 335(13.2) 990(39) 345(13.6) 965(38) 1075(42.3) 624(24.6) 366(14.
ODMI-A-1110 4. Wiring Diagram 4.1 M2OC-18HRDN1-M 4.
ODMI-A-1110 4.
ODMI-A-1110 5. Refrigeration Cycle Diagram 8.1 Refrigeration circuit drawing of inverter dual zone Axial flow fan EXVA Exhaust temp. sensor Main Capillary Auxiliary Capillary Filter A Liquid valve A Filter B Liquid valve B Capillary A EXVB Condenser 4-way valve Check Valve Coil temp. sensor Evaporator Cross Indoor pipe out temp. sensor A Gas valve A Indoor pipe out temp. sensor B Compressor Gas valve B Indoor Unit Outdoor Unit 5.
ODMI-A-1110
ODMI-A-1110 6. Indoor units combination 6.1 Indoor unit combination for M2OC-18HRDN1-M Comb. Dual(1x1) Dual (1x2) Combinations Unit A Unit B 9k — 12k — 18k — 9k 9k 9k 12k 12k 12k 6.2 Indoor unit combination for M3OC-27HRDN1-M Comb. TRI (1x1) TRI (1x2) TRI (1x3) Combinations Unit A Unit B Unit C 9k — — 12k — — 18k — — 9k 9k — 9k 12k — 9k 18k — 12k 12k — 12k 18k — 9k 9k 9k 9k 9k 12k 9k 12k 12k 6.3 Indoor unit combination for M4OC-36HRDN1-M Comb.
ODMI-A-1110 7. Installation Details 7.1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque mm inch N.cm N.cm $ 6.35 1/4 1500(153kgf.cm) 1600(163kgf.cm) $ 9.52 3/8 2500(255kgf.cm) 2600(265kgf.cm) $ 12.7 1/2 3500(357kgf.cm) 3600(367kgf.cm) 7.2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. For power line: Unit AWG dual-zone(18K outdoor unit) 14 tri-zone (27K outdoor unit).
ODMI-A-1110 7.4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below: ● ● ● ● ● Pressure in the system rises. Operating 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.
ODMI-A-1110 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, and then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure.
ODMI-A-1110 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 to use a hexagonal wrench to operate the valve stems. 7). Mount the valve stems nuts and the service port cap. Be sure to use a torque wrench to tighten the service port cap to a torque 18N·m. Be sure to check the gas leakage. 3.
ODMI-A-1110 from the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose. 7). Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage. 7.5 Adding the refrigerant after running the system for many years Electronic scale Procedure: 1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.
ODMI-A-1110 7). Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N.m. Be sure to check for gas leakage. 7.6 Re-installation while the indoor unit need to be repaired 1. Collecting the refrigerant into the outdoor unit Procedure 1). Confirm that both the 2-way and 3-way valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position.
ODMI-A-1110 Use a torque wrench to tighten the 3-way valves service port cap to a torque of 1.8 kgf.m. Be sure to check for gas leakage. 2. Air purging by the refrigerant Procedure: 1). Confirm that both the 2-way and 3-way valves are set to the closed position. 2). Connect the charge set and a charging cylinder to the service port of the 3-way valve Leave the valve on the charging cylinder closed. 3). Air purging. Open the valves on the charging cylinder and the charge set.
ODMI-A-1110 Be sure to use a hexagonal wrench to operate the valve stems. 7). Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m. Be sure to check the gas leakage. 7.7 Re-installation while the outdoor unit need to be repaired 1. Evacuation for the whole system Procedure: 1). Confirm that both the 2-way and 3-way valves are set to the opened position. 2). Connect the vacuum pump to 3-way valve’s service port. 3).
ODMI-A-1110 2. Refrigerant charging Procedure: 1). Connect the charge hose to the charging cylinder; open the 2-way valve and the 3-way valve Connect the charge hose which you disconnected from the vacuum 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).
8. Electronic control function 8.1 Abbreviation T1: Indoor ambient temperature T2: Coil temperature of indoor heat exchanger middle. T2B: Coil temperature of indoor heat exchanger outlet. T3: Coil temperature of outdoor heat exchanger T4: Outdoor ambient temperature T5: Compressor discharge temperature Ts: Setting temp. 8.2 Electric control working environment. 8.2.1 Input voltage: 230V. 8.2.2 Input power frequency:60Hz. 8.2.3 Indoor fan normal working amp. is less than 1A. 8.2.4 Outdoor fan.
14 EXV open angle for 2# indoor unit Actual data divide 8 15 EXV open angle for 3# indoor unit Actual data divide 8 16 EXV open angle for 4# indoor unit Actual data divide 8 17 18 19 Power supply of outdoor unit Indoor unit number The last error or protection code AD data The indoor unit can communicate with outdoor unit well. 00 means no malfunction 20 frequency value Actual data 21 Ambient temp. of 22 Condenser pipe temp. of 23 Ambient temp. of 24 Condenser pipe temp.
8.4.4Number of indoor unit Display Number of indoor unit 1 1 2 2 3 3 8.4.5 Outdoor ambient temp: Display Corresponding temp. Display Corresponding temp. Display Corresponding temp. 15 -7.5 50 10 80 25 16 -7 51 10.5 81 25.5 17 -6.5 52 11 82 26 18 -6 53 11.5 83 26.5 19 -5.5 53 11.5 84 27 20 -5 54 12 85 27.5 21 -4.5 55 12.5 86 28 22 -4 56 13 87 28.5 23 -3.5 57 13.5 88 29 24 -3 58 14 89 29.5 26 -2 59 14.5 90 30 27 -1.
8.4.6 Opening degree of electronic expansion valve: Actual opening degree equals the display data divided 8 8.5 Protection 8.5.1 Three minutes delay at restart for compressor. 8.5.2 Temperature protection of compressor discharge. When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules: ----If 102℃115 ℃ for 10 seconds, the compressor will stop and restart till T5<90℃.
HEAT_F7 IHEATLMT3 HEAT_F6 IHEATLMT2 HEAT_F5 IHEATLMT1 (When the frequency>Heat_F4 via capacity demand). If the current frequency is lower than HEAT_F4, the frequency will not be limited. After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds and stop. The AC will restart 3 minutes later. 8.5.
9. Troubleshooting 9.
9.3 Trouble shooting 9.3.
Indoor unit display LED STATUS E1 Communication malfunction between indoor and outdoor units Turn off the power supply, after 1 minute, connect the power supply, turn on the unit with remote controller The unit does not work normally Check the wiring between indoor and outdoor unit. Is the connection of L, N, S and GND good? No Reconnect and retest Yes Is the LED4(red) bright and LED1(yellow) blinking on outdoor PCB? Yes Replace indoor PCB and repower No The power supply for outdoor PCB is fail.
Indoor unit display LED STATUS E2 Zero-crossing signal error Is power supply and connection of connectors good? NO Be sure the power supply is good and correct the connection YES Indoor PCB is defective. Replace the indoor PCB. Indoor unit display LED STATUS E3 Indoor fan speed out of control Is the indoor fan motor connector and connection good? NO Repair the connector and reconnect YES Is voltage being applied to the fan motor? YES Indoor PCB is defective. Replace the indoor PCB.
Indoor unit display LED STATUS E6 Open or short circuit of room or evaporator coil temperature sensor Is the indoor temperature and evaporator sensor connector and connection good? NO Repair the connector and reconnect YES YES Replace the sensor and check if E6 display again? Replace the.
Indoor unit display LED STATUS P2 Temperature protection of compressor top. Does the compressor operate? No Is the connection good? Yes No Reconnect it Yes Is refrigerant circulation volume normal? Is protector normal? No, Charge refrigerant Is the abnormality the same after gas charging? No Replace it Yes Replace the outdoor PCB. There is block (Such as capillary or welded points of the pipes.) Indoor unit display LED STATUS P3 Outdoor temp.
9.3.2 Outdoor unit trouble shooting Outdoor unit display LED STATUS E0 EEPROM parameter error Shut off the power supply and turn on it 1 minute later The problem comes out again Is the EEPROM chip plugged in indoor PCB No Correct the connection Replace the main PCB of indoor unit Outdoor unit display LED STATUS No 1 Indoor units pipe temp. sensor or connector of pipe temp. sensor is E1 defective Is connection to connector of pipe temp.
Is connection to connector of pipe temp. sensor good? No Yes Repair connector Check the resistance of the temp. sensor according to Annex 1 Replace the sensor Outdoor unit display LED STATUS No 3 Indoor units pipe temp. sensor or connector of pipe temp. sensor is E3 defective Is connection to connector of pipe temp. sensor good? No Yes Repair connector Check the resistance of the temp. sensor according to Annex 1 Replace the sensor Outdoor unit display LED STATUS No 4 Indoor units pipe temp.
Outdoor unit display LED STATUS E4 Open or short circuit of outdoor temperature sensor Is connection to connector of pipe temp. sensor good? No Yes Repair connector Check the resistance of the temp.
Outdoor unit display LED STATUS E7 Communication error between outdoor IC and DSP Is the LED in outdoor main PCB light? Yes No No Check the signal wires between outdoor PCBs, is it connected good. 1.Is the +5 voltage in outdoor main board? Power Board: CN4, Red wire and yellow (GND) Outdoor main PCB: CZ1 2.Is the +12v voltage in outdoor main board? Power Board: CN1, Purple wire and yellow (GND) Inverter module defective.
Outdoor unit display LED STATUS P0 Temperature protection of compressor top. Off: 105c; On: 90c The trouble shooting is same with the one of indoor unit P2 protection. Outdoor unit display LED STATUS P3 Compressor current protection Check the resistance of compressor, normally U and V is 0.6 ohm U and W is 0.6 ohm V and W is 0.
Outdoor unit display LED STATUS P6 Condenser high-temperature protection When outdoor pipe temp. is more than 52°C. 65°C, the unit will stop, and unit runs again when outdoor pipe temp. less than Is the outdoor pipe temp.
Outdoor unit display LED STATUS PF PFC module protection Check the voltage of power supply, if the voltage is about 220V, turn off the power supply and turn it on again after 1 minute Does the unit work normally ? No Check whether the power supply of bridge rectifiers input port is normal. No Replace the outdoor PCB Yes No Check whether the power supply of bridge rectifiers output port is 325VDC Replace bridge rectifiers Yes Check whether the voltage between P and N port in IPM is 380V.
Annex 1 Characteristic of temp. sensor Temp. ℃ Resistance K© Temp. ℃ Resistance K© Temp. ℃ Resistance K© -10 62.2756 17 14.6181 44 4.3874 -9 58.7079 18 13.918 45 4.2126 -8 56.3694 19 13.2631 46 4.0459 -7 52.2438 20 12.6431 47 3.8867 -6 49.3161 21 12.0561 48 3.7348 -5 46.5725 22 11.5 49 3.5896 -4 44 23 10.9731 50 3.451 -3 41.5878 24 10.4736 51 3.3185 -2 39.8239 25 10 52 3.1918 -1 37.1988 26 9.5507 53 3.0707 0 35.2024 27 9.1245 54 2.
Annex 2 1. Reference voltage data: a) Rectifier : Input :220-230V(AC), output :310V(DC) b) Inverter module: U,V, W 3ph. Result U-V 60-150V(AC) U-W 60-150V(AC) V-W 60-150V(AC) P-N DC 310V c) Photo-couple PC817, PC851: Control side <+5V, AC side :< 24V(AC) d) S terminal and N: changeable from 0-24V 2. Check the Diode Bridge component ( In wiring diagram, rectifier) Remark: If this part is abnormal, the LED will not light.
