Midea M2OC-18HRDN1-M User manual

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 ................................................................8
6.Indoor units combination....................................................................10
7.Installation Details...............................................................................11
8.Electronic control function.................................................................20
9.Troubleshooting..................................................................................25

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(39x13.6x38) TNB306FPGMC-L

ODMI-A-1110
2
．
Features
The hydrophilic fin can improve the heating efficiency at operation mode.
It is only operated in the heating operation mode except 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

ODMI-A-1110
3. Dimensions
mm(in)
Model W D H W1 A B
M2OC-18HRDN1-M 845((33.3) 320(12.6) 700(27.6) 908(35.7) 560(22) 335(13.2)
M3OC-27HRDN1-M
M4OC-36HRDN1-M 990(39) 345(13.6) 965(38) 1075(42.3) 624(24.6) 366(14.4)

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4. Wiring Diagram
4.1 M2OC-18HRDN1-M
4.2 M3OC-27HRDN1-M

ODMI-A-1110
4.3 M4OC-36HRDN1-M

ODMI-A-1110
5. Refrigeration Cycle Diagram
8.1 Refrigeration circuit drawing of inverter dual zone
5.2 Refrigeration circuit drawing of inverter tri-zone
8.3 Refrigeration circuit drawing of inverter qua-zone
Liquid valve A
Gas valve C
EXV C
4
-
way
valve
Compressor
Condenser
Axial
flow fan
EXV B
EXV A
Gas valve A
Gas valve B
Liquid valve C
Liquid valve B
Evaporator
Cross
flow fan
Indoor Unit
Capillary A
Capillary B
Capillary C
Filter A
Filter B
Filter C
Main
Capillary
Auxiliary
Capillary
Check
Valve
Exhaust
temp. sensor
Indoor pipe out
temp.
sens
or B
Indoor pipe out
temp. sen
sor A
Indoor pipe out
temp. sen
s
or C
Outdoor Unit
Coil temp.
sensor
Indoor Unit
Cross
flow fan
Evaporator
Liquid valve A
Liquid valve B
Gas valve B
Gas valve A
EXVA
EXVB
Axial
flow fan
Condenser
Compressor
4
-
way
valve
Auxiliary
Capillary
Capillary A
Capillary B
Exhaust
temp. sensor
Indoor pipe out
temp. sen
s
or A
Indoor pipe out
temp. sen
s
or B
Filter A
Filter B
Outdoor Unit
Main
Capillary
Check
Valve
Coil temp.
sensor

ODMI-A-1110

ODMI-A-1110
6. Indoor units combination
6.1 Indoor unit combination for M2OC-18HRDN1-M
Comb.
Combinations
Unit A
Unit B
Dual(1x1)
9k
—
12k
—
18k
—
Dual (1x2)
9k
9k
9k
12k
12k
12k
6.2Indoor unit combination for M3OC-27HRDN1-M
Comb.
Combinations
Unit A
Unit B
Unit C
TRI (1x1)
9k
—
—
12k
—
—
18k
—
—
TRI (1x2)
9k
9k
—
9k
12k
—
9k
18k
—
12k
12k
—
12k
18k
—
TRI (1x3)
9k
9k
9k
9k
9k
12k
9k
12k
12k
6.3Indoor unit combination for M4OC-36HRDN1-M
Comb.
Combinations
Unit A
Unit B
Unit C
Unit D
QUA (1x1)
9k
—
—
—
12k
—
—
—
18k
—
—
—
QUA (1x2)
9k
9k
—
—
9k
12k
—
—
9k
18k
—
—
12k
12k
—
—
12k
18k
—
—
18k
18k
—
—
QUA (1x3)
9k
9k
9k
—
9k
9k
12k
—
9k
9k
18k
—
9k
12k
12k
—
9k
12k
18k
—
9k
18k
18k
—
12k
12k
12k
—
12k
12k
18k
—
12k
18k
18k
—
QUA(1x4)
9k
9k
9k
9k
9k
9k
9k
12k
9k
9k
9k
18k
9k
9k
12k
12k
9k
9k
12k
18k
9k
12k
12k
12k
9k
12k
12k
18k
12k
12k
12k
12k
12k
12k
12k
18k