Midea ODMFI-E-2110 User manual

1
Multi outdoor units
SERVICE MANUAL Multi zone
CONDENSING UNITS
WARNING
Installation MUST conform with local building codes or, in the absence of local
codes, with the National Electrical Code NFPA70/ANSI C1-1993 or current edition
and Canadian Electrical Code Part1 CSA C.22.1.
The information contained in the manual is intended for use by a qualified service
technician familiar with safety procedures and equipped with the proper tools and
test instruments
Installation or repairs made by unqualified persons can result in hazards to you
and others.
Failure to carefully read and follow all instructions in this manual can result in
equipment malfunction, property damage, personal injury and/or death.
Table of Contents
1. Indoor Unit Combination
2. Dimension Of Outdoor Unit
3. Refrigerant Cycle Diagram
4. Installation Details
5. Electronic Function
6. Wiring Diagrams
7. Trouble Shooting
8. Disassembly Instructions
Revision K: ODMFI-E-2110
Model Numbers:
M2OF-18HFN1-M M3OF-27HFN1-M M4OF-36HFN1-M
M5OF-48HFN1-M M2OH-18HFN1-M M3OH-27HFN1-M
M4OH-36HFN1-M M5OG-48HFN1-M-[X] M2OI-18HFN1-M
M3OJ-27HFN1-M M3OI-28HFN1-M M4OG-36HFN1-M
M2OA-18HFN1-M M4OI-36HFN1-M M5OG-48HFN1-M

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CONTENTS
1. Indoor Unit Combination ................................................................................................................... 5
2. Dimension Of Outdoor Unit............................................................................................................... 8
3. Refrigerant Cycle Diagram ...............................................................................................................10
4. Installation Details.............................................................................................................................14
4.1 Wrench torque sheet for installation ..............................................................................................14
4.2 Connecting the cables...................................................................................................................14
4.3 Pipe length and the elevation ........................................................................................................14
4.4 First-Time Installation....................................................................................................................14
4.5 Adding Refrigerant after Long-Term System Operation.................................................................16
4.6 Procedure when servicing the indoor unit refrigeration circuit........................................................16
4.7 Evacuation after servicing the outdoor unit refrigeration circuit......................................................17
5. Electronic Function...........................................................................................................................19
5.1 Abbreviation..................................................................................................................................19
5.2 Electric Control Working Environment...........................................................................................19
5.3 Main Protection .............................................................................................................................19
5.4 Control and Functions ...................................................................................................................21
6. Wiring Diagrams................................................................................................................................27
7. Troubleshooting................................................................................................................................54
7.1Safety.............................................................................................................................................54
7.2.............................................................................................................................Indoor Unit Error Display
55
7.3 Outdoor Unit Display .....................................................................................................................58
7.4 Diagnosis and Solution..................................................................................................................67
7.5 Trouble Criterion of Main Parts....................................................................................................126
8. Disassembly Instructions...............................................................................................................137
M2OF-18HFN1-M (WCA30 metal plate)......................................................................................137
M2OA-18HFN1-M (WX430 metal plate)......................................................................................137

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M2OH-18HFN1-M, M3OF-27HFN1-M, M3OH-27HFN1-M (WD30 metal plate) ..........................151
M4OF-36HFN1-M (WD30 metal plate) ........................................................................................159
M4OH-36HFN1-M, M5OF-48HFN1-M (WE30 metal plate)..........................................................166

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5
1. Indoor Unit Combination
Multi DC Outdoor
Unit
Nominal
capacity
Suggested
Combination
Limit
M2OF-18HFN1-M
M2OA-18HFN1-M
5.2kW
6+6
None
6+9
6+12
9+9
9+12
12+12
M2OH-18HFN1-M
M2OI-18HFN1-M
5.2kW
6+6
None
6+9
6+12
6+18
9+9
9+12
12+12
Multi DC Outdoor
Unit
Nominal
capacity
Suggested Combination
Limit
Two units
Three units
M3OF-27HFN1-M
M3OJ-27HFN1-M
7.8kW
6+12
6+6+6
6+12+12
None
6+18
6+6+9
6+12+18
9+9
6+6+12
9+9+9
9+12
6+6+18
9+9+12
9+18
6+9+9
9+9+18
12+12
6+9+12
9+12+12
12+18
6+9+18
12+12+12
18+18
M3OH-27HFN1-M
M3OI-28HFN1-M
7.8kW
6+12
6+6+6
6+9+18
None
6+18
6+6+9
6+12+12
9+9
6+6+12
9+9+9
9+12
6+6+18
9+9+12
9+18
6+6+24
9+9+18
9+24
6+9+9
9+12+12
12+12
6+9+12
12+12+12
12+18
12+24
18+18

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Multi DC Outdoor Unit
Nominal capacity
Suggested Combination
Limit
Two units
Three units
Four units
M4OF-36HFN1-M
M4OG-36HFN1-M
10.5kW
6+18
6+6+12
9+9+12
6+6+6+6
6+9+9+18
None
6+24
6+6+18
9+9+18
6+6+6+9
6+9+9+24
9+18
6+6+24
9+9+24
6+6+6+12
6+9+12+12
9+24
6+9+12
9+12+12
6+6+6+18
6+9+12+18
12+12
6+9+18
9+12+18
6+6+6+24
6+12+12+12
12+18
6+9+24
9+12+24
6+6+9+9
6+12+12+18
12+24
6+12+12
9+18+18
6+6+9+12
9+9+9+9
18+18
6+12+18
12+12+12
6+6+9+18
9+9+9+12
18+24
6+12+24
12+12+18
6+6+9+24
9+9+9+18
24+24
6+18+18
12+12+24
6+6+12+12
9+9+12+12
6+18+24
12+18+18
6+6+12+18
9+9+12+18
9+9+9
6+6+12+24
9+12+12+12
6+9+9+9
12+12+12+12
6+9+9+12
M4OH-36HFN1-M
M4OI-36HFN1-M
10.5kW
6+18
6+6+12
9+9+9
6+6+6+6
6+9+9+12
None
6+24
6+6+18
9+9+12
6+6+6+9
6+9+9+18
6+30
6+6+24
9+9+18
6+6+6+12
6+9+9+24
9+18
6+6+30
9+9+24
6+6+6+18
6+9+12+12
9+24
6+9+12
9+9+30
6+6+6+24
6+9+12+18
9+30
6+9+18
9+12+12
6+6+6+30
6+12+12+12
12+12
6+9+24
9+12+18
6+6+9+9
6+12+12+18
12+18
6+9+30
9+12+24
6+6+9+12
9+9+9+9
12+24
6+12+12
9+18+18
6+6+9+18
9+9+9+12
12+30
6+12+18
12+12+12
6+6+9+24
9+9+9+18
18+18
6+12+24
12+12+18
6+6+12+12
9+9+12+12
18+24
6+12+30
12+12+24
6+6+12+18
9+9+12+18
18+30
6+18+18
12+18+18
6+6+12+24
9+12+12+12
24+24
6+18+24
6+9+9+9
12+12+12+12

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Multi DC
Outdoor
Unit
Nominal
capacity
Suggested Combination
Limit
Two
units
Three units
Four units
Five units
M5OG-
42HFN1-
M-[X]
&M5OF-
48HFN1-M
& M5OG-
48HFN1-
M-
[X]&M5OG-
48HFN1-M
14kW
9+24
6+6+24
9+12+18
6+6+6+18
6+9+18+30
6+6+6+6+9
6+6+12+12+12
None
9+30
6+6+30
9+12+24
6+6+6+24
6+12+12+12
6+6+6+6+12
6+6+12+12+18
9+36
6+6+36
9+12+30
6+6+6+30
6+12+12+18
6+6+6+6+18
6+6+12+12+24
12+24
6+9+24
9+12+36
6+6+6+36
6+12+12+24
6+6+6+6+24
6+6+12+18+18
12+30
6+9+30
9+18+18
6+6+9+18
6+12+12+30
6+6+6+6+30
6+9+9+9+9
12+36
6+9+36
9+18+24
6+6+9+24
6+12+18+18
6+6+6+6+36
6+9+9+9+12
18+18
6+12+18
9+18+30
6+6+9+30
6+12+18+24
6+6+6+9+9
6+9+9+9+18
18+24
6+12+24
9+18+36
6+6+9+36
9+9+9+9
6+6+6+9+12
6+9+9+9+24
18+30
6+12+30
9+24+24
6+6+12+12
9+9+9+12
6+6+6+9+18
6+9+9+9+30
18+36
6+12+36
9+24+30
6+6+12+18
9+9+9+18
6+6+6+9+24
6+9+9+12+12
24+30
6+18+18
12+12+12
6+6+12+24
9+9+9+24
6+6+6+9+30
6+9+9+12+18
24+36
6+18+24
12+12+18
6+6+12+30
9+9+9+30
6+6+6+9+36
6+9+9+12+24
30+30
6+18+30
12+12+24
6+6+12+36
9+9+9+36
6+6+6+12+12
6+9+9+18+18
6+18+36
12+12+30
6+6+18+18
9+9+12+12
6+6+6+12+18
6+9+12+12+12
6+24+24
12+12+36
6+6+18+24
9+9+12+18
6+6+6+12+24
6+9+12+12+18
6+24+30
12+18+18
6+6+18+30
9+9+12+24
6+6+6+12+30
6+9+12+12+24
9+9+18
12+18+24
6+6+24+24
9+9+12+30
6+6+6+18+18
6+12+12+12+12
9+9+24
12+18+30
6+9+9+12
9+9+18+18
6+6+6+18+24
6+12+12+12+18
9+9+30
12+24+24
6+9+9+18
9+9+18+24
6+6+9+9+9
9+9+9+9+9
9+9+36
18+18+18
6+9+9+24
9+12+12+12
6+6+9+9+12
9+9+9+9+12
9+12+12
18+18+24
6+9+9+30
9+12+12+18
6+6+9+9+18
9+9+9+9+18
6+9+9+36
9+12+12+24
6+6+9+9+24
9+9+9+9+24
6+9+12+12
9+12+12+30
6+6+9+9+30
9+9+9+12+12
6+9+12+18
9+12+18+18
6+6+9+12+12
9+9+9+12+18
6+9+12+24
9+12+18+24
6+6+9+12+18
9+9+9+12+24
6+9+12+30
12+12+12+12
6+6+9+12+24
9+9+12+12+12
6+9+12+36
12+12+12+18
6+6+9+12+30
9+9+12+12+18
6+9+18+18
12+12+12+24
6+6+9+18+18
9+12+12+12+12
6+9+18+24
12+12+18+18
6+6+9+18+24
12+12+12+12+12

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2. Dimension Of Outdoor Unit
H
D
A
B
Model
Unit
W
D
H
W1
A
B
M2OF-18HFN1-M
mm
845
363
702
923
540
350
inch
33.3
14.3
27.6
36.0
21.3
13.8
M2OA-18HFN1-M
mm
890
342
673
990
663
354
inch
35.04
13.46
26.50
38.98
26.10
13.94
M2OH-18HFN1-M
M3OF-27HFN1-M
M3OH-27HFN1-M
M2OI-18HFN1-M
M3OJ-27HFN1-M
M3OI-28HFN1-M
mm
946
410
810
1034
673
403
inch
37.2
16.5
31.9
40.6
26.5
15.9
M4OF-36HFN1-M
M4OG-36HFN1-M
mm
946
410
810
1034
673
403
inch
37.2
16.5
31.9
40.6
26.5
15.9

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H
W
A
D
W1
B
Model
Unit
W
D
H
W1
A
B
M4OH-36HFN1-M
M5OF-48HFN1-M
M5OG-48HFN1-M-[X]
M4OI-36HFN1-M
M5OG-48HFN1-M
mm
952
415
1333
1060
634
404
inch
37.5
16.3
52.5
41.7
25.0
15.9

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3. Refrigerant Cycle Diagram
3.1 Refrigeration circuit drawing of M2OF-18HFN1-M, M2OA-18HFN1-M
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 TUBE
EXV B
LIQUID VALVE B
GAS VALVE B
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
3.2 Refrigeration circuit drawing of M2OH-18HFN1-M, M2OI-18HFN1-M
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 TUBE
EXV B
LIQUID VALVE B
GAS VALVE B
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