Midea M2OG-14HFN8-Q User manual

SERVICE MANUAL
MIDEA AIRCONDITIONER
EUROPE MARKET
SUPER DC INVERTER MULTI TYPE
M2OG-14HFN8-Q
M2OC-18HFN8-Q
M2OD-18HFN8-Q
M3OF-21HFN8-Q
M3OF-27HFN8-Q
M3OE-27HFN8-Q
M4OB-36HFN8-Q
M5OD-42HFN8-Q
M4OE-28HFN8-Q
M5OE-42HFN8-Q
DC MULTI OUTDOOR UNITS

CONTENTS
1. General information of Outdoor Units .................................. 2
2. Features .................................................................................. 3
3. Dimensions ............................................................................. 4
4. Refrigeration Cycle Diagram ................................................. 5
5. Wiring diagram ....................................................................... 7
6. Indoor units combination .................................................... 14
7. Sound Levels ........................................................................ 17
8. Installation Details ............................................................... 18
8.1 Wrench torque sheet for installation ........................................................................... 18
8.2 Connecting the cables ................................................................................................ 18
8.3 Pipe length and the elevation ..................................................................................... 18
8.4 Installation for the first time ......................................................................................... 19
8.5 Adding the refrigerant after running the system for many years ................................ 22
8.6 Re-installation while the indoor unit need to be repaired ........................................... 23
8.7 Re-installation while the outdoor unit need to be repaired ......................................... 24
9. Electronic control function .................................................. 27
10. Troubleshooting ................................................................. 32
Caution: Risk of fire/flammable materials

1.
General information of Outdoor Units
Model name Dimension (mm) Compressor
M2OG-14HFN8-Q 800x333x554
KSN140D21UFZ
M2OC-18HFN8-Q 800x333x554
KSM135D23UFZ
M2OD-18HFN8-Q 800x333x554
KSN140D21UFZ
M3OF-21HFN8-Q 845x363x702
KSN140D21UFZ
M3OE-27HFN8-Q 845x363x702
KTF235D22UMT
M3OF-27HFN8-Q 845x363x702
KTM240D57UMT
M4OB-36HFN8-Q 946x410x810
KTF310D43UMT
M4OE-28HFN8-Q 946x410x810
KTM240D57UMT
M5OD-42HFN8-Q 946x410x810
KTF310D43UMT
M5OE-42HFN8-Q 946x410x810
KTF310D43UMT

2.
Features
The hydrophilic fin can improve the heating efficiency at operation mode.
It protects the valves and prevents water from dripping.
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Outdoor unit
Power relay control
Hydrophilic aluminum fin
Anti-rust cabinet
Valve protection cover
Low noise air flow system
Discharge pipe temperature protection

3.
Dimensions
Model Unit：mm
W D H W1 A B
M2OG-14HFN8-Q 800 333 554 860 514 340
M2OC-18HFN8-Q 800 333 554 860 514 340
M2OD-18HFN8-Q 800 333 554 860 514 340
M3OF-21HFN8-Q 845 363 702 923 540 350
M3OE-27HFN8-Q 845 363 702 923 540 350
M3OF-27HFN8-Q 845 363 702 923 540 350
M4OE-28HFN8-Q 946 410 810 1034 673 403
M4OB-36HFN8-Q 946 410 810 1034 673 403
M5OD-42HFN8-Q 946 410 810 1034 673 403
M5OE-42HFN8-Q 946 410 810 1034 673 403
A
B
D

4.
Refrigeration Cycle Diagram
4.1
Refrigeration circuit drawing of inverter 1 drive 2 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
Accumulator
T2B-A
Evaporator
temp. sensor outlet
T2B-B
4.2 Refrigeration circuit drawing of inverter 1 drive 3 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILLARY C
LIQUID VALVE C
GAS VALVE C
Accumulator
T2B-A
Evaporator
temp. sensor outlet
T2B-B
T2B-C

4.3 Refrigeration circuit drawing of inverter 1 drive 4 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCH ANGE
(EVAP ORATOR)
HEAT
EXCHANGE
(CONDENSER)
Compressor
4-WAY VALVE
COO LING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILLA RY C
LIQUID VALVE C
GAS VALVE C
EXV D CAPILLA RY D
LIQUID VALVE D
GAS VALVE D
Accumulator
High pressure
switch
Low pressure
switch
T2B-A Evapora tor
temp. sensor outlet
T2B-B
T2B-C
T2B-D
4.4 Refrigeration circuit drawing of inverter 1 drive 5 type
LIQUID VALVE A
GAS VALVE A
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
COOLING
HEATING
T2 Evaporator
temp. sensor
middle
T1 Room
temp. sensor
T3
Condenser
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
EXV A CAPILLARY A
CHECK VALVE
CAPILLARY TUBE
EXV B CAPILLARY B
LIQUID VALVE B
GAS VALVE B
EXV C CAPILLARY C
LIQUID VALVE C
GAS VALVE C
EXV D CAPILLARY D
LIQUID VALVE D
GAS VALVE D
EXV E CAPILLARY E
LIQUID VALVE E
GAS VALVE E
Compressor
4-WAY VALVE
T5 Discharge
temp. sensor
Accumulator
High pressure
switch
Low pressure
switch
T2B-A
Evaporator
temp. sensor outlet
T2B-B
T2B-C
T2B-D
T2B-E

5.
Wiring diagram
M2OC-18HFN8-Q
M2OG-14HFN8-Q

M2OD-18HFN8-Q

Note: S(1)&S(2) are used in other type of models. They don't need to be connected in multi
models.