Midea M2OC-14HRDN1-Q, M3OC1-21HRDN1-Q, M2OC-18HRDN1, M2OC1-18HRDN1-Q, M3OC-27HRDN1 Technical & Service Manual
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ODMI-A-1202
GD Midea Refrigeration Equipment Co.,Ltd
MULTI SPLIT TYPE, HEAT PUMP AIR CONDITIONERS
Technical service manual
R410A Multi DC inverter
220~240V-1Ph-50Hz
Outdoor units Models
M2OC-14HRDN1
M2OC-14HRDN1-Q
M2OC-18HRDN1
M2OC1-18HRDN1-Q
M3OC1-21HRDN1-Q
M3OC-27HRDN1
M3OC1-27HRDN1-Q
M4OC-24HRDN1-Q
M4OC1-27HRDN1-Q
M4OC-27HRDN1
M4OC-36HRDN1-Q
M5OA-36HRDN1-Q
CONTENTS
1. General information of Outdoor Units ................................... 3
2. Features .................................................................................. 4
3. Dimensions ............................................................................. 5
4. Wiring Diagram ....................................................................... 6
5. Refrigeration Cycle Diagram ................................................ 11
6. Indoor units combination ..................................................... 13
7. Electronic control function .................................................. 15
8. Troubleshooting ................................................................... 24
1. General information of Outdoor Units
Model name Dimension (mm) Net/Gross weight (kg) Compressor
M2OC-14HRDN1 760*590*285 39/41 DA108X1C-20FZ3
M2OC-14HRDN1-Q 760*590*285 39/41 DA108X1C-20FZ3
M2OC-18HRDN1 845*700*320 57.5/61.5 C-6RVN93H0N
M2OC1-18HRDN1-Q 845*700*320 53.5/57 DA130S1C-20FZ
M3OC1-21HRDN1-Q 845*700*320 55/60 DA130S1C-20FZ
M3OC-27HRDN1 845*700*320 59/62 C-6RZ146H1A
M3OC1-27HRDN1-Q 845*700*320 57/60.5 DA150S1C-20FZ
M4OC-24HRDN1-Q 845*700*320 56/60 DA150S1C-20FZ
M4OC-27HRDN1 900*860*315 73/78 TNB220FLHMC-L
M4OC1-27HRDN1-Q 900*860*315 73/78 DA250S2C-30MT
M4OC-36HRDN1-Q
(220057200010)
990*965*345 86/90 TNB306FPGM
M4OC-36HRDN1-Q
(220057200011)
990*965*345 86/90 TNB306FPGMC-L
M5OA-36HRDN1-Q
(220057100360)
990*965*345 86.5/91 TNB306FPGM
M5OA-36HRDN1-Q
(220057100361)
990*965*345 86.5/91 TNB306FPGMC-L
2. Features
The hydrophilic fin can improve the heating efficiency at operation mode.
It is only operated in the heating operation mode ex
cept defrosting operation.
It protects the valves and prevents water from dripping.
Outdoor unit
Power relay control
Hydrophilic aluminum fin
Anti-rust cabinet
Valve protection cover
4 way valve control
Low noise air flow system
Discharge pipe temperature protection
Compressor crankcase heater
3. Dimensions
More than 30cm
More than 60cm
More than 70cm
More than 30cm
More than 60cm
(Service space
Fence or
obstacles
MODEL W D H W1 A B
M2OC-14HRDN1-Q
M2OC-14HRDN1
760 285 590 823 530 290
M2OC-18HRDN1 845 320 700 908 560 335
M2OC1-18HRDN1-Q 845 320 700 908 560 335
M3OC1-21HRDN1-Q 845 320 700 908 560 335
M3OC-27HRDN1 845 320 700 908 560 335
M3OC1-27HRDN1-Q 845 320 700 908 560 335
M4OC-24HRDN1-Q
845 320 700 908 560 335
M4OC-27HRDN1
M4OC1-27HRDN1-Q
900 315 860 980 590 333
M4OC-36HRDN1-Q
M5OA-36HRDN1-Q
990 345 965 1075 624 366
4. Wiring Diagram
4.1 M2OC-14HRDN1-Q
4.2 M2OC-14HRDN1
4.3 M2OC1-18HRDN1-Q
4.4 M3OC1-21HRDN1-Q M3OC1-27HRDN1-Q M3OC-27HRDN1
4.5 M2OC-18HRDN1
4.6 M4OC-24HRDN1-Q
4.7 M4OC1-27HRDN1-Q、M4OC-27HRDN1
4.8 M4OC-36HRDN1-Q
4.9 M5OA-36HRDN1-Q
5. Refrigeration Cycle Diagram
5.1 Refrigeration circuit drawing of inverter binary type
4.2 Refrigeration circuit drawing of inverter trinary type
5.3 Refrigeration circuit drawing of inverter quadplex type
5.4 Refrigeration circuit drawing of inverter quintuple type
6. Indoor units combination
6.1 Indoor unit combination for M2OC-14HRDN1-Q、M2OC-14HRDN1
One unit Two unit
7 7+7 9+9
9 7+9 9+12
12 7+12
Note: There should be no more than one cassette or duct or console or ceiling & floor unit.
6.2 Indoor unit combination for M2OC1-18HRDN1-Q、M2OC-18HRDN1
One unit Two unit
7 7+7 9+9
9 7+9 9+12
12 7+12 12+12
18 7+18
Note: The 18k indoor unit should only be wall mounted unit.
6.3 Indoor unit combination for M3OC1-21HRDN1-Q
One unit Two unit Three unit
7 7+7 9+9 7+7+7 7+9+12
9 7+9 9+12 7+7+9 9+9+9
12 7+12 9+18 7+7+12 9+9+12
18 7+18 12+12 7+9+9
Note: There should be no more than one cassette or duct or console or ceiling & floor unit. And the 18k indoor unit
should only be wall mounted unit.
6.4 Indoor unit combination for M3OC1-27HRDN1-Q、M3OC-27HRDN1
One unit
Two unit Three unit
7 7+7 9+9 12+12 7+7+7 7+9+9 9+9+9
9 7+9 9+12 12+18 7+7+9 7+9+12 9+9+12
12 7+12 9+18 7+7+12 7+12+12 9+12+12
18 7+18 7+7+18
Note: The 18k indoor unit should only be wall mounted unit.
6.5 Indoor unit combination for M4OC-24HRDN1-Q
One unit Two unit Three unit Four unit
7 7+7 9+9 12+12 7+7+7 7+9+9 9+9+9 7+7+7+7 7+7+9+9 9+9+9+9
9 7+9 9+12 12+18 7+7+9 7+9+12 9+9+12 7+7+7+9 7+7+9+12 9+9+9+12
12 7+12 9+18 7+7+12 7+12+12 9+12+12 7+7+7+12 7+9+9+9
18 7+18 7+7+18 7+9+9+12
Note: The 18k indoor unit should only be wall mounted unit.
6.6 Indoor unit combination for M4OC1-27HRDN1-Q、M4OC-27HRDN1
One unit Two unit Three unit Four unit
7 7+7 9+9 12+12 7+7+7 7+9+12 9+9+9 7+7+7+7 7+7+9+9 7+9+9+12
9 7+9 9+12 12+18 7+7+9 7+9+18 9+9+12 7+7+7+9 7+7+9+12 7+9+12+12
12 7+12 9+18 18+18 7+7+12 7+12+12 9+9+18 7+7+7+12 7+7+12+12 9+9+9+9
18 7+18 7+7+18 7+12+18 9+12+12 7+7+7+18 7+9+9+9 9+9+9+12
7+9+9 12+12+12 9+12+18
6.7 Indoor unit combination for M4OC-36HRDN1-Q
6.8 Indoor unit combination for M5OA-36HRDN1-Q
One Unit Two Unit Three Unit
7 7+7 9+12 7+7+7 7+9+18 9+9+18 12+18+18
9 7+9 9+18 7+7+9 7+12+12 9+12+12 18+18+18
12 7+12 12+12 7+7+12 7+12+18 9+12+18
18 7+18 12+18 7+7+18 7+18+18 9+18+18
9+9 18+18 7+9+9 9+9+9 12+12+12
7+9+12 9+9+12 12+12+18
Four Unit
7+7+7+7 7+7+9+18 7+9+9+18 7+12+18+18 9+9+18+18
7+7+7+9 7+7+12+12 7+9+12+12 9+9+9+9 9+12+12+12
7+7+7+12 7+7+12+18 7+9+12+18 9+9+9+12 9+12+12+18
7+7+7+18 7+7+18+18 7+9+18+18 9+9+9+18 12+12+12+12
7+7+9+9 7+9+9+9 7+12+12+12 9+9+12+12 12+12+12+18
7+7+9+12 7+9+9+12 7+12+12+18 9+9+12+18
Five Unit
7+7+7+7+7 7+7+7+9+18 7+7+9+12+18 7+9+9+12+18 9+9+9+12+12
7+7+7+7+9 7+7+7+12+18 7+7+12+12+18 7+9+12+12+12 9+9+9+12+18
7+7+7+7+12 7+7+7+18+18 7+9+9+9+9 7+9+12+12+18 9+9+12+12+12
7+7+7+7+18 7+7+9+9+9 7+9+9+9+12 9+9+9+9+9 9+12+12+12+12
7+7+7+9+9 7+7+9+9+12 7+9+9+9+18 9+9+9+9+12 12+12+12+12+12
7+7+7+9+12 7+7+9+9+18 7+9+9+12+12 9+9+9+9+18
One unit
Two unit Three unit Four unit
7 7+7 9+9 12+12 7+7+7 7+12+12 9+12+18 7+7+7+7 7+7+12+12 7+9+12+18 9+9+12+12
9 7+9 9+12 12+18 7+7+9 7+12+18 9+18+18 7+7+7+9 7+7+12+18 7+9+18+18 9+9+12+18
12 7+12 9+18 18+18 7+7+12 7+18+18 12+12+12 7+7+7+12 7+7+18+18 7+12+12+12 9+12+12+12
18 7+18
7+7+18 9+9+9 12+12+18 7+7+7+18 7+9+9+9 7+12+12+18 9+12+12+18
7+9+9 9+9+12 12+18+18 7+7+9+9 7+9+9+12 9+9+9+9 12+12+12+12
7+9+12 9+9+18 7+7+9+12 7+9+9+18 9+9+9+12 12+12+12+18
7+9+18 9+12+12
7+7+9+18 7+9+12+12 9+9+9+18
7. Electronic control function
7.1 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.
7.2 Electric Control working environment.
7.2.1 Input voltage: 190~264V.
7.2.2 Input power frequency:50Hz.
7.2.3 Indoor fan normal working amp. is less than 1A.
7.2.4 Outdoor fan. Normal working amp. is less than 1.5A.
7.2.5 Four-way valve normal working amp. is less than 1A.
7.2.6 Swing motor: DC12V.
7.3 Outdoor unit’s digital display tube
There is a digital display tube in outdoor PCB.
Digital display tube display function
In standby , 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 2s)
In compressor pre-heating, The LED displays “- -”
In protection or malfunction, the LED displays error code or protection code.
7.4 Outdoor unit point check function
There is a check switch in outdoor PCB.
Push the switch SW1 to check the states of unit when the unit is running. The digital display tube will display
the follow procedure when push SW1 each time.
For units except M5OA-36HRDN1-Q model:
Display Remark
1
Indoor unit capacity demand code
2
Outdoor unit running mode code Off:0, Cooling:1, Heating:2
3
Amendatory capacity demand code
4
Outdoor unit fan motor state Off:0, Low speed:1, High speed:2
5
Evaporator outlet temp. for 1# indoor unit Actual data
6
Evaporator outlet temp. for 2# indoor unit Actual data
7
Evaporator outlet temp. for 3# indoor unit Actual data
8
Evaporator outlet temp. for 4# indoor unit Actual data
9
Condenser pipe temp. Actual data
10
Ambient temp. Actual data
11
Compressor discharge temp. Actual data
12
Inverter current Actual data
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