Midea Advantage Series User manual

1
Multi outdoor units
SERVICE MANUAL
Multi zone
CONDENSING UNITS
Revision E: ODMFI-E-1712
Model Numbers:
M2OF-18HFN1-M M3OF-27HFN1-M M4OF-36HFN1-M
M5OF-48HFN1-M
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

2
CONTENTS
1. Indoor Unit Combination.......................................................................................................................................... 4
2. Dimension Of Outdoor Unit...................................................................................................................................... 6
3. Refrigerant Cycle Diagram........................................................................................................................................ 8
4. Installation Details.................................................................................................................................................. 11
4.1 Wrench torque sheet for installation ...............................................................................................................11
4.2 Connecting the cables ......................................................................................................................................11
4.3 Pipe length and the elevation...........................................................................................................................11
4.4 First-Time Installation....................................................................................................................................... 11
4.5 Adding Refrigerant after Long-Term System Operation...................................................................................13
4.6 Procedure when servicing the indoor unit refrigeration circuit....................................................................... 13
4.7 Evacuation after servicing the outdoor unit refrigeration circuit ....................................................................14
5. Electronic Function................................................................................................................................................. 16
5.1 Abbreviation .....................................................................................................................................................16
5.2 Electric Control Working Environment............................................................................................................. 16
5.3 Main Protection................................................................................................................................................16
5.4 Control and Functions ......................................................................................................................................18
6. Wiring Diagrams .....................................................................................................................................................23
7. Troubleshooting .....................................................................................................................................................30
7.1Safety.................................................................................................................................................................30
7.2Indoor Unit Error Display...................................................................................................................................31
7.3 Outdoor Unit Display ........................................................................................................................................34
7.4 Diagnosis and Solution ..................................................................................................................................... 39
7.5 Trouble Criterion of Main Parts........................................................................................................................89
8. Disassembly Instructions ...................................................................................................................................... 100
M2OF-18HFN1-M (WCA30 metal plate).................................................................................................100
M3OF-27HFN1-M (WD30 metal plate).................................................................................................... 107

3
M4OF-36HFN1-M (WD30 metal plate).................................................................................................... 115
M5OF-48HFN1-M (WE30 metal plate) ....................................................................................................122

4
1. Indoor Unit Combination
Multi DC
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
1drive 2
5.2kW
12
None
9+9
9+12
12+12
Multi DC
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
1 drive 5
14kW
18+18
None
18+24
24+24
9+9+18
9+9+24
9+12+12
9+12+18
9+12+24
9+18+18
9+18+24
9+24+24
12+12+12
12+12+18
12+12+24
12+18+18
12+18+24
12+24+24
18+18+18
Multi DC
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
1drive 3
7.8kW
9+9
None
9+12
9+18
12+12
12+18
18+18
9+9+9
9+9+12
9+9+18
9+12+12
9+12+18
12+12+12
Multi DC
Outdoor Unit
Nominal
capacity
Suggested
Combination
Limit
1 drive 4
10.5kW
9+18
None
12+12
12+18
18+18
9+9+9
9+9+12
9+9+18
9+12+12
9+12+18
9+18+18
12+12+12
12+12+18
12+18+18
9+9+9+9
9+9+9+12
9+9+9+18
9+9+12+12
9+9+12+18
9+12+12+12
12+12+12+12

5
18+18+24
9+9+9+9
9+9+9+12
9+9+9+18
9+9+9+24
9+9+12+12
9+9+12+18
9+9+12+24
9+9+18+18
9+9+18+24
9+12+12+12
9+12+12+18
9+12+12+24
9+12+18+18
9+18+18+18
12+12+12+12
12+12+12+18
12+12+12+24
12+12+18+18
9+9+9+9+9
9+9+9+9+12
9+9+9+9+18
9+9+9+9+24
9+9+9+12+12
9+9+9+12+18
9+9+9+18+18
9+9+12+12+12
9+9+12+12+18
9+12+12+12+12
9+12+12+12+18
12+12+12+12+12

6
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
M3OF-27HFN1-M
mm
946
410
810
1034
673
403
inch
37.2
16.5
31.9
40.6
26.5
15.9
M4OF-36HFN1-M
mm
946
410
810
1034
673
403
inch
37.2
16.5
31.9
40.6
26.5
15.9

7
H
W
A
D
W1
B
Model
Unit：
W
D
H
W1
A
B
M5OF-48HFN1-M
mm
952
415
1333
1060
634
404
inch
37.5
16.3
52.5
41.7
25.0
15.9

8
3. Refrigerant Cycle Diagram
3.1 Refrigeration circuit drawing of inverter 1 drive 2 type
L IQ U ID V A L V E A
G A S V A L V E A
H E A T
E X C H A N G E
(E V A P O R A T O R )
H E A T
E X C H A N G E
(C O N D E N S E R )
C o m p re s s o r
4 -W A Y V A L V E
C O O L IN G
H E A T IN G
T 2 E v a p o ra to r
te m p . s e n so r
m id d le
T 1 R o o m
te m p . s e n so r
T3
C o n d e n s e r
te m p . s e n so r
T 5 D is c h a rg e
te m p . s e n so r
T 4 A m b ie n t
te m p . s e n so r
IN D O O R O U T D O O R
E X V A C A P IL LA R Y A
C H E C K V A L V E
C A P IL LA R Y T U B E
E X V B C A P IL LA R Y B
L IQ U ID V A L V E B
G A S V A L V E B
A c c u m u la to r
T 2 B -A E v a po ra to r
te m p. s en so r ou tle t
T 2 B -B
3.2 Refrigeration circuit drawing of inverter 1 drive 3 type
L IQ U ID V A L V E A
G A S V A L V E A
H E A T
E X C H A N G E
(E V A P O R A T O R )
H E A T
E X C H A N G E
(C O N D E N S E R )
C om pre ssor
4 -W A Y V A L V E
C O O L IN G
H E A T IN G
T 2 E v a p o ra to r
te m p. se ns or
m id dle
T 1 R o o m
te m p. se ns or
T3
C o n d e n s e r
te m p. se ns or
T 5 D is ch a rg e
te m p. se ns or
T 4 A m b ie n t
te m p. se ns or
IN D O O R O U T D O O R
E X V A C A P IL LA R Y A
C H E C K V A L V E
C A P IL LA R Y T U B E
E X V B C A P IL LA R Y B
L IQ U ID V A L V E B
G A S V A L V E B
E X V C C A P IL L A R Y C
L IQ U ID V A L V E C
G A S V A L V E C
A cc um u la to r
T 2 B -A E v ap o ra to r
te m p . s e n s o r o u tle t
T 2 B -B
T 2 B -C

9
3.3 Refrigeration circuit drawing of inverter 1 drive 4 type
L IQ U ID V A L V E A
G A S V A L V E A
H E A T
E X C H A N G E
(E V A P O R A T O R )
H E A T
E X C H A N G E
(C O N D E N S ER )
C om p re ssor
4 -W A Y V A L V E
C O O LIN G
H E A T IN G
T 2 E v a po ra to r
te m p . se n s o r
m id d le
T 1 R o o m
te m p . se n s o r
T3
Condenser
te m p . se n s o r
T 5 D is ch a rg e
te m p . se n s o r
T 4 A m b ie n t
te m p . se n s o r
IN D O O R O U TD O O R
E X V A C A P ILL A R Y A
C H E C K V A L V E
C A P IL L A R Y T U B E
E X V B C A P ILL A R Y B
L IQ U ID V A L V E B
G A S V A L V E B
E X V C C A P IL LA R Y C
L IQ U ID V A L V E C
G A S V A L V E C
E X V D C A P IL LA R Y D
L IQ U ID V A L V E D
G A S V A L V E D A cc um u la to r
H ig h p re s s u re
sw itch
L o w p re s s u re
sw itch
T 2 B -A E v ap ora to r
te m p. s e ns o r outle t
T 2 B -B
T 2 B -C
T 2 B -D
3.4 Refrigeration circuit drawing of inverter 1 drive 5 type
L IQ U ID V A L V E A
G A S V A L V E A
H E A T
E X C H A N G E
(E V A P O R A T O R ) H E A T
E X C H A N G E
(C O N D E N S E R )
C O O LIN G
H E A T IN G
T 2 E v a p o ra to r
te m p . se n s o r
T 1 R o o m
te m p . se n s o r
T3
C o n d e n s e r
te m p . se n s o r
T 4 A m b ie n t
te m p . se n s o r
IN D O O R O U T D O O R
E X V A C A P IL L A R Y A
C H E C K V A LV E
C A P IL LA R Y T U B E
E X V B C A P IL L A R Y B
L IQ U ID V A L V E B
G A S V A L V E B
E X V C C A P IL L A R Y C
L IQ U ID V A L V E C
G A S V A L V E C
E X V D C A P IL L A R Y D
L IQ U ID V A L V E D
G A S V A L V E D
E X V E C A P IL L A R Y E
L IQ U ID V A L V E E
G A S V A L V E E
C o m p re s so r
4 -W A Y V A L V E
T 5 D is ch a rg e
te m p . se n s o r
A c cu m u la to r H ig h p res su re
sw itch
Lo w p re s s u re
sw itch
T 2 B -A E v a p o ra to r
te m p . s e n s o r o u tle t
T 2 B -B
T 2 B -C
T 2 B -D
T 2 B -E

10