ODMI-1103-A
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
ODMI-1103-A
CONTENTS
1. General information of Outdoor Units .....................................3
2. Features ......................................................................................4
3. Dimensions .................................................................................5
4. Wiring Diagram ...........................................................................6
5. Refrigeration Cycle Diagram ...................................................10
6. Indoor units combination ........................................................12
7. Electronic control function .....................................................14
8. Troubleshooting .......................................................................23
ODMI-1103-A
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
ODMI-1103-A
2. Features
Outdoor unit
Power relay control
Low noise air flow system
Hydrophilic aluminum fin
The hydrophilic fin can improve the heating efficiency at operation mode.
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Anti-rust cabinet
Valve protection cover
It protects the valves and prevents water from dripping.
Discharge pipe temperature protection
Compressor crankcase heater
ODMI-1103-A
3. Dimensions
MODEL
M2OC-14HRDN1-Q
M2OC-14HRDN1
M2OC-18HRDN1
W
D
H
W1
A
B
760
285
590
823
530
290
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
M4OC-27HRDN1
M4OC1-27HRDN1-Q
M4OC-36HRDN1-Q
M5OA-36HRDN1-Q
845
320
700
908
560
335
900
315
860
980
590
333
990
345
965
1075
624
366
ODMI-1103-A
4. Wiring Diagram
4.1 M2OC-14HRDN1-Q
4.2 M2OC-14HRDN1
ODMI-1103-A
4.3 M2OC1-18HRDN1-Q 、M3OC1-21HRDN1-Q
4.4 M2OC-18HRDN1、M3OC-27HRDN1
ODMI-1103-A
4.5 M3OC1-27HRDN1-Q、M4OC-24HRDN1-Q
4.6 M4OC1-27HRDN1-Q、M4OC-27HRDN1
ODMI-1103-A
4.7 M4OC-36HRDN1
4.8
M5OA-36HRDN1-Q
ODMI-1103-A
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
ODMI-1103-A
5.4 Refrigeration circuit drawing of inverter quintuple type
ODMI-1103-A
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.
should only be wall mounted unit.
And the 18k indoor 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
Note: The 18k indoor unit should only be wall mounted unit.
7+9+9+12
ODMI-1103-A
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
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
6.8 Indoor unit combination for M5OA-36HRDN1-Q
One Unit
7
9
12
18
Two Unit
7+7
7+9
7+12
7+18
9+9
9+12
9+18
12+12
12+18
18+18
7+7+7+7
7+7+7+9
7+7+7+12
7+7+7+18
7+7+9+9
7+7+9+12
7+7+9+18
7+7+12+12
7+7+12+18
7+7+18+18
7+9+9+9
7+9+9+12
7+7+7+7+7
7+7+7+7+9
7+7+7+7+12
7+7+7+7+18
7+7+7+9+9
7+7+7+9+12
7+7+7+9+18
7+7+7+12+18
7+7+7+18+18
7+7+9+9+9
7+7+9+9+12
7+7+9+9+18
7+7+7
7+7+9
7+7+12
7+7+18
7+9+9
7+9+12
Four Unit
7+9+9+18
7+9+12+12
7+9+12+18
7+9+18+18
7+12+12+12
7+12+12+18
Five Unit
7+7+9+12+18
7+7+12+12+18
7+9+9+9+9
7+9+9+9+12
7+9+9+9+18
7+9+9+12+12
7+9+18
7+12+12
7+12+18
7+18+18
9+9+9
9+9+12
Three Unit
9+9+18
9+12+12
9+12+18
9+18+18
12+12+12
12+12+18
7+12+18+18
9+9+9+9
9+9+9+12
9+9+9+18
9+9+12+12
9+9+12+18
9+9+18+18
9+12+12+12
9+12+12+18
12+12+12+12
12+12+12+18
7+9+9+12+18
7+9+12+12+12
7+9+12+12+18
9+9+9+9+9
9+9+9+9+12
9+9+9+9+18
9+9+9+12+12
9+9+9+12+18
9+9+12+12+12
9+12+12+12+12
12+12+12+12+12
12+18+18
18+18+18
ODMI-1103-A
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
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
Off:0, Cooling:1, Heating:2
ODMI-1103-A
13
EXV open angle for 1# indoor unit
Actual data/8
14
EXV open angle for 2# indoor unit
Actual data/8
15
EXV open angle for 3# indoor unit
Actual data/8
16
EXV open angle for 4# indoor unit
Actual data/8
17
18
19
Power supply of outdoor unit
Indoor unit number
The last error or protection code
AD data
The indoor unit can communicate with outdoor unit well.
00 means no malfunction
20
frequency value
Actual data
21
Ambient temp. of 1# indoor unit
Actual data
22
Condenser pipe temp. of 1# indoor unit
Actual data
23
Ambient temp. of 2# indoor unit
Actual data
24
Condenser pipe temp. of 2# indoor unit
Actual data
25
Ambient temp. of 3# indoor unit
Actual data
26
Condenser pipe temp. of 3# indoor unit
Actual data
27
Ambient temp. of 4# indoor unit
Actual data
28
Condenser pipe temp. of 4# indoor unit
Actual data
29
――
Check point over
For M5OA-36HRDN1-Q model:
Display
Remark
1
No.of indoor units in good connection
Actual data
2
Outdoor unit running mode code
Off:0, Cooling:2, Heating:3, Forced cooling:4
3
A indoor unit capacity
4
B indoor unit capacity
5
C indoor unit capacity
6
D indoor unit capacity
7
E indoor unit capacity
8
A Indoor unit capacity demand code
9
B Indoor unit capacity demand code
10
C Indoor unit capacity demand code
11
D Indoor unit capacity demand code
12
E Indoor unit capacity demand code
13
Total indoor units amendatory capacity
demand code
The frequency corresponding to the total
indoor units amendatory capacity demand
The frequency after the frequency limit
14
15
16
17
The frequency sending to compressor contol
chip
A indoor unit evaporator outlet temp.(T2BA)
18
B indoor unit evaporator outlet temp.(T2BB)
19
C indoor unit evaporator outlet temp.(T2BC)
20
D indoor unit evaporator outlet temp.(T2BD)
21
E indoor unit evaporator outlet temp.(T2BE)
22
A indoor unit room temp.(T1A)
23
B indoor unit room temp.(T1B)
24
C indoor unit room temp.(T1C)
25
D indoor unit room temp.(T1D)
26
E indoor unit room temp.(T1E)
The capacity unit is horse power.If the indoor unit is not
connected,the digital display tube will show: “――”
If the temp.is lower than -9 degree, the digital display tube will
show “-9”.If the temp.is higher than 70 degree,the digital display
tube will show “70”. If the indoor unit is not connected,the digital
display tube will show: “――”
ODMI-1103-A
27
A indoor unit evaporator outlet temp.(T2BA)
28
B indoor unit evaporator outlet temp.(T2BB)
29
C indoor unit evaporator outlet temp.(T2BC)
30
D indoor unit evaporator outlet temp.(T2BD)
31
E indoor unit evaporator outlet temp.(T2BE)
32
Condenser pipe temp.(T3)
33
Outdoor ambient temp.(T4)
34
Compressor discharge temp.(Tp)
35
36
AD value of current
AD value of voltage
37
EXV open angle for A indoor unit
38
EXV open angle for B indoor unit
39
EXV open angle for C indoor unit
40
EXV open angle for D indoor unit
41
EXV open angle for E indoor unit
42
If the temp.is lower than -9 degree, the digital display tube will
show “-9”.If the temp.is higher than 70 degree,the digital display
tube will show “70”. If the indoor unit is not connected,the digital
display tube will show: “――”
The display value is between 30~120 degree.If the temp.is lower
than 30 degree,the digital display tube will show “30”.If the
temp.is higher than 99 degree, the digital display tube will show
single digit and tens digit.For example,the digital display tube
show “0.5”,it means the compressor discharge temp.is 105
degree.)
The display value is hex number.
Actual data/4.
If the value is higher than 99, the digital display tube will show
single digit and tens digit.
For example,the digital display tube show “2.0”,it means the EXV
open angle is 120×4=480p.)
Bit7
0
Bit6
0
Bit5
Frequency limit caused by T4.
Bit4
Frequency limit caused by T2.
Bit3
Frequency limit caused by T3.
Bit2
Frequency limit caused by Tp.
Bit1
Frequency limit caused by current
Bit0
Frequency limit caused by voltage
Frequency limit symbol
The display
value is hex
number.For
example,the
digital display
tube show
2A,then Bit5=1,
Bit3=1, Bit1=1.
It means
frequency limit
caused by
T4,T3 and
current.
43
Average value of T2
(Sum T2 value of all indoor units)/(indoor units number)
44
Outdoor unit fan motor state
Off:0, High speed:1, Med speed:2, Low speed:3
45
The last error or protection code
00 means no malfunction
7.4.1 Frequency of compressor:
Display
Frequency of compressor (Hz)
30
30
--
Stand by
60
60
Display
Corresponding mode
0
Off
1
Cooling mode
2
Heating mode
7.4.2 Running mode:
ODMI-1103-A
7.4.3 Capacity demand:
Cooling mode
Capacity
2000-2
500
2000-2
500
3000-3
800
4500-5
000
5000-5
500
5500-6
100
6100-7
000
7000-7
500
7500-8
000
>7500
Correspondi
ng Code
1
2
3
4
5
6
7
8
9
>=10
Heating mode
Capacity
2000-2
500
2000-2
500
3000-3
800
4500-5
000
5500-6
100
6100-7
000
6100-7
000
7000-7
500
7500-8
000
>8000
Correspondin
g Code
1
2
3
4
5
6
7
8
9-10
>=11
Note:
The capacity is just for reference.
ODMI-1103-A
7.4.4Number of indoor unit
Display
Number of indoor unit
1
1
2
2
3
3
7.4.5 Outdoor ambient temp:
Display
Corresponding temp.
Display
Corresponding
temp.
Display
Corresponding
temp.
15
-7.5
50
10
80
25
16
-7
51
10.5
81
25.5
17
-6.5
52
11
82
26
18
-6
53
11.5
83
26.5
19
-5.5
53
11.5
84
27
20
-5
54
12
85
27.5
21
-4.5
55
12.5
86
28
22
-4
56
13
87
28.5
23
-3.5
57
13.5
88
29
24
-3
58
14
89
29.5
26
-2
59
14.5
90
30
27
-1.5
60
15
91
30.5
28
-1
61
15.5
92
31
29
-0.5
62
16
93
31.5
30
0
63
16.5
93
31.5
31
0.5
63
16.5
94
32
32
1
64
17
95
32.5
33
1.5
65
17.5
96
33
34
2
65
17.5
97
33.5
35
2.5
66
18
98
34
36
3
67
18.5
99
34.5
37
3.5
68
19
10.
35~40
38
4
69
19.5
11.
40~45
39
4.5
70
20
12.
45~50
40
5
71
20.5
13.
50~55
41
5.5
72
21
14.
55~60
42
6
73
21.5
15.
60~65
43
6.5
74
22
16.
65~70
44
7
75
22.5
45
7.5
75
22.5
46
8
76
23
47
8.5
77
23.5
48
9
78
24
49
9.5
79
24.5
ODMI-1103-A
7.4.6 Opening degree of electronic expansion valve:
Opening degree equals the display data times 8
7.5 Protection
7.5.1 Three minutes delay at restart for compressor.
7.5.2 Temperature protection of compressor discharge.
When the compressor discharge temp. is getting higher, the running frequency will be limited as below
rules:
----If 102℃<T5<115℃, decrease the frequency to the lower level every 2 minutes till to F1.
---If T5>115℃ for 10 seconds, the compressor will stop and restart till T5<90℃.
7.5.3 Under voltage protection
VOLTAGE
VOLREL1
No limit
VOLLIMT1
VOLFRE1
VOLREL2
VOLLIMT2
VOLFRE2
VOLREL3
VOLLIMT3
Off
Mode
VOLLIMT1(V)
VOLLIMT2(V)
VOLLIMT3(V)
VOLREL1(V)
VOLREL2(V)
VOLREL3(V)
VOLFRE1(Hz)
VOLFRE2(Hz)
M2OC-14HRDN1
220
200
80
250
210
100
62
54
M2OC-14HRDN1-Q
220
200
80
250
210
100
62
54
M2OC-18HRDN1
230
200
80
260
210
100
62
54
M2OC1-18HRDN1-Q
230
200
120
260
210
135
62
54
M3OC1-21HRDN1-Q
245
220
80
265
240
100
78
45
M3OC-27HRDN1
245
220
80
265
240
100
78
45
M3OC1-27HRDN1-Q
245
220
120
265
240
135
78
45
M4OC-24HRDN1-Q
245
220
120
265
240
135
78
45
M4OC-27HRDN1
221
210
80
260
225
100
62
54
M4OC1-27HRDN1-Q
221
210
80
260
225
100
53
44
M4OC-36HRDN1-Q
200
185
80
210
195
100
54
42
For M5OA-36HRDN1-Q,
VOLTAGE
No limit
VOLT_RST1_ADD
VOLT_LTM1_ADD
VOLT_LTM_FREQ1_ADD
VOLT_RST2_ADD
VOLT_LTM2_ADD
VOLT_LTM_FREQ2_ADD
ODMI-1103-A
VOLT_RST1_ADD=210V, VOLT_LIM1_ADD=200V, VOLT_RST2_ADD=195V, VOLT_LIM2_ADD=185V.
VOLT_LIM_FREQ1_ADD=54Hz, VOLT_LIM_FREQ2_ADD=42Hz.
7.5.4 Compressor current limit protection
If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be
limited as below table.
For models except M5OA-36HRDN1-Q.
Cooling mode:
Current frequency(Hz)
Current limit value(A)
Frequency limit
COOL_F10
ICOOLLMT6
COOL_F9
ICOOLLMT5
Decrease the frequecny to COOL_F4 and
run at COOL_F4 for 3 minutes.
COOL_F8
ICOOLLMT4
COOL_F7
ICOOLLMT3
COOL_F6
ICOOLLMT2
COOL_F5
ICOOLLMT1
After that,the frequency will be adjusted
according to the capacity demand and rise
to the upper level every 3 minutes
(When the frequency>COOL_F4 via
capacity demand).
If the current frequency is lower than COOL_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>ICOOL,the AC will display the failure for 30 seconds
and stop. The AC will restart 3 minutes later.
Heating mode:
Current frequency(Hz)
Current limit value(A)
Frequency limit
HEAT_F12
IHEATLMT8
HEAT_F11
IHEATLMT7
Decrease the frequecny to HEAT_F4 and
run at HEAT_F4 for 3 minutes.
HEAT_F10
IHEATLMT6
HEAT_F9
IHEATLMT5
HEAT_F8
IHEATLMT4
HEAT_F7
IHEATLMT3
HEAT_F6
IHEATLMT2
HEAT_F5
IHEATLMT1
After that,the frequency will be adjusted
according to the capacity demand and rise
to the upper level every 3 minutes
(When the frequency>Heat_F4 via capacity
demand).
If the current frequency is lower than HEAT_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds
and stop. The AC will restart 3 minutes later.
For M5OA-36HRDN1-Q model:
Cooling mode:
Current
(Hz)
frequency
Current limit value(A)
COOL_F16
ICOOLLMT12
COOL_F15
ICOOLLMT11
COOL_F14
ICOOLLMT10
COOL_F13
ICOOLLMT9
COOL_F12
ICOOLLMT8
COOL_F11
ICOOLLMT7
COOL_F10
ICOOLLMT6
Frequency limit
Decrease the frequecny to COOL_F4 and run at
COOL_F4 for 3 minutes.
After that,the frequency will be adjusted according to
the capacity demand and rise to the upper level every
3 minutes
(When the frequency>COOL_F4 via capacity
demand).
ODMI-1103-A
COOL_F9
ICOOLLMT5
COOL_F8
ICOOLLMT4
COOL_F7
ICOOLLMT3
COOL_F6
ICOOLLMT2
COOL_F5
ICOOLLMT1
If the current frequency is lower than COOL_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>ICOOL,the AC will display the failure for 30 seconds
and stop. The AC will restart 3 minutes later.
Heating mode:
Current
(Hz)
frequency
Current limit value(A)
HEAT_F16
IHEATLMT12
HEAT_F15
IHEATLMT11
HEAT_F14
IHEATLMT10
HEAT_F13
IHEATLMT9
HEAT_F12
IHEATLMT8
HEAT_F11
IHEATLMT7
HEAT_F10
IHEATLMT6
HEAT_F9
IHEATLMT5
HEAT_F8
IHEATLMT4
HEAT_F7
IHEATLMT3
HEAT_F6
IHEATLMT2
HEAT_F5
IHEATLMT1
Frequency limit
Decrease the frequecny to HEAT_F4 and run at
HEAT_F4 for 3 minutes.
After that,the frequency will be adjusted according to
the capacity demand and rise to the upper level every
3 minutes
(When the frequency>Heat_F4 via capacity
demand).
If the current frequency is lower than HEAT_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>IHEAT,the AC will display the failure for 30 seconds
and stop. The AC will restart 3 minutes later.
6.5.5 Indoor / outdoor units communication protection
If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes,the AC will stop
and display the failure.
7.5.6 High condenser coil temp. protection.
When T3>65℃ for 3 seconds, the compressor will stop while the indoor fan and outdoor fan will continue.
When T3<52℃, the protection will release and the compressor will restart after 3 minutes.
7.5.7 Outdoor unit anti-freezing protection
When T2B<0℃ for 250 seconds,the indoor unit capacity demand will be zero and resume to normal when
T2B>10℃.
7.5.8 Oil return
Running rules:
ODMI-1103-A
1. If the compressor frequency keeps lower than RECOILINFRE for Te minutes,the AC will rise the
frequency to RECOILFRE for Tf seconds and then resume to former frequency.For M4OC-36HRDN1-Q,
RECOILINFRE=45Hz, RECOILFRE=48Hz,Te=120,Tf=180; For M5OA-36HRDN1-Q, RECOILINFRE=45Hz,
RECOILFRE=48Hz, Te=90,Tf=100; For other models, RECOILINFRE=50Hz, RECOILFRE=62Hz,
Te=120,Tf=180.
2. During the Tf seconds, the EXV and indoor units keep the current running mode(except
M5OA-36HRDN1-Q model), the frequency will not be limited by the compressor discharge temp.and the
current.For M5OA-36HRDN1-Q model,the EXV will keep 300p while the indoor units will keep the current
running mode.
3. If the outdoor ambient is higher than 15℃ during the oil return,the AC quit oil return.
7.5.9 Compressor preheating functions
----Preheating permitting condition:
If T4(outdoor ambient temperature)<3℃ and the machine connects to power supply no longer than 5
seconds or if T4<3℃ and compressor has stopped for over 3 hours, the compressor heating cable will work.
----Preheating mode:
A weak current flow through the coil of compressor from the wiring terminal of compressor, then the
compressor is heated without operation.
----Preheating release condition:
If T4≧5℃ or the compressor starts running, preheating function will stop.
7.5.10 Compressor crankcase heater
When T4<3℃ and the compressor is not running,the crankcase heater will be active.
When T4≧5℃ or the compressor starts up,the crankcase heater will stop work.(For M5OA-36HRDN1-Q,T4
≧8℃)
ODMI-1103-A
8. Troubleshooting
8.1 Indoor unit error code explanation:
R series(except model MSR1I-07HRDN1-Q&MSR1I-09HRDN1-Q)+X series+Y series:
MALFUNCTION
Display
E0
EEPROM parameter error
E1
Indoor / outdoor units communication protection
E2
Zero-crossing signal error
E3
Fan speed out of control
E5
Open or short circuit of outdoor temperature sensor
E6
Open or short circuit of room or evaporator temperature sensor
P0
IGBT over-strong current protection
P1
Over voltage or too under voltage protection
P2
Temperature protection of compressor top.
P4
Inverter compressor drive error
9V series+VERTU series
1
EEPROM error
O
O
O
O
DISPLAY
DIGITAL TUBE
E0
2
Indoor / outdoor units communication protection
☆
☆
☆
☆
E1
3
Zero-crossing signal error
Indoor fan speed out of control
O
O
☆
☆
☆
☆
E2
4
O
O
5
Outdoor unit temp. sensor or connector of temp. sensor is
defective
X
O
X
☆
O
O
O
O
O
☆
☆
☆
E6
7
Open or short circuit of room or evaporator temperature
sensor
Outdoor fan speed out of control
8
IBM malfunction or IGBT over-strong current protection
X
X
O
☆
P0
9
Over voltage or too under voltage protection
X
O
O
☆
P1
10
11
Temperature protection of compressor top.
Compressor position protection
O
O
X
X
X
☆
☆
☆
P2
P4
12
Inverter module protection
X
O
☆
☆
P5
NO.
6
MALFUNCTION
☆ Flash(at 0.5Hz, P5 at 0.25Hz)
O light
DEF
TIMER
AUTO
RUN
E3
E5
E7
X(off)
9A series+R series(Only for model MSR1I-07HRDN1-Q&MSR1I-09HRDN1-Q)
DEF
TIMER
AUTO
RUN
EEPROM error
O
O
O
O
DISPLAY
DIGITAL TUBE
E0
2
Indoor / outdoor units communication protection
☆
☆
☆
☆
E1
3
Zero-crossing signal error
Indoor fan speed out of control
O
O
☆
☆
☆
☆
E2
4
O
O
5
Outdoor unit temp. sensor or connector of temp. sensor is
defective
X
O
X
☆
☆
☆
E6
NO.
1
MALFUNCTION
E3
E5
O
O
7
Open or short circuit of room or evaporator temperature
sensor
Outdoor fan speed out of control
☆
O
O
☆
8
IBM malfunction or IGBT over-strong current protection
X
X
O
☆
P0
9
Over voltage or too under voltage protection
X
O
O
☆
P1
10
11
Temperature protection of compressor top.
Compressor position protection
O
O
X
X
X
☆
☆
☆
P2
P4
12
Inverter module protection
X
O
☆
☆
P5
6
☆ Flash(at 0.5Hz, P5 at 0.25Hz)
O light
X(off)
E7
ODMI-1103-A
Cassette/Ceiling&Floor series:
Operation
Timer
De-frost
Alarm
LED STATUS

X
X
X
Indoor room temp. sensor open or short-circuit
X
X
★
X
Indoor pipe temp. sensor open or short-circuit
X

X
X
Indoor and outdoor communication error
X
X
X
★
Water level alarm


X
X
EEPROM error

X
X

Inverter module protection


X
X
Outdoor sensor open or short circuit


X

Outdoor voltage protection

X

X
Compressor top temp. protection

X


Mode conflict

X


Outdoor current protection
 flash,  light, X extinguished.
A5 Duct:
LED STATUS
DISPLAY
DIGITAL
TUBE
E0
Operation
Timer
De-frost
Alarm
★
X
X
X
Indoor room temp. sensor open or
short-circuit
X
★
X
Indoor pipe temp. sensor open or
short-circuit
E1
X
★
X
X
Indoor and outdoor communication
error
E2
X
X
X
X
★
Water level alarm
E3
★
★
X
X
EEPROM error
E4
★
X
X

Inverter module protection
E5
★

X
X
Outdoor sensor open or short circuit
E6
★
●
★
X
Outdoor fan speed out of control
★

X

Outdoor voltage protection
P0
★
★
★
★
Compressor top temp. protection
P3
★
◎
X
X
Compressor position. protection
P4
★
X

X
Mode conflict
P5
 flash at 5Hz,  light, X extinguished ◎flash at 0.5Hz
E7
ODMI-1103-A
8.2 Outdoor unit error code explanation:
For units(except M5OA-36HRDN1-Q model)
Display
LED STATUS
E0
EEPROM error
E1
No A Indoor unit coil outlet temp. sensor or connector of sensor is defective
E2
No B Indoor unit coil outlet temp. sensor or connector of sensor is defective
E3
No C Indoor unit coil outlet temp. sensor or connector of sensor is defective
E6
No D Indoor unit coil outlet temp. sensor or connector of sensor is defective
E4
Outdoor unit temp. sensor or connector of temp. sensor is defective
E5
Compressor voltage protection
E7
Communication malfunction between outdoor main chip and compressor control chip
Temperature protection of compressor discharge or compressor top.
P0
For M4OC-36HRDN1-Q,it only means compressor discharge temp.protection.
P1
High pressure protection(only for M4OC1-27HRDN1-Q, M4OC-36HRDN1-Q)
P2
Low pressure protection(only for M4OC1-27HRDN1-Q, M4OC-36HRDN1-Q)
P3
Compressor current protection
P4
Inverter module protection
P6
Condenser high-temperature protection
ODMI-1103-A
For M5OA-36HRDN1-Q model
Display
LED STATUS
E0
EEPROM error
E2
Communication malfunction between outdoor unit and indoor units
E3
Communication malfunction between outdoor main chip and compressor control chip.
E4
Outdoor unit temp. sensor or connector of temp. sensor is defective
E5
Compressor voltage protection
E6
PFC module protection
F1
No A Indoor unit coil outlet temp. sensor or connector of sensor is defective
F2
No B Indoor unit coil outlet temp. sensor or connector of sensor is defective
F3
No C Indoor unit coil outlet temp. sensor or connector of sensor is defective
F4
No D Indoor unit coil outlet temp. sensor or connector of sensor is defective
F5
No E Indoor unit coil outlet temp. sensor or connector of sensor is defective
P0
Compressor top. temperature
P1
High pressure protection
P2
Low pressure protection
P3
Compressor current protection
P4
Compressor discharge high-temperature protection
P5
Condenser high-temperature protection
P6
Inverter module protection
protection
ODMI-1103-A
8.3Trouble shooting
8.3.1 EEPROM parameter error diagnosis and solution
Shut off the power supply and turn on it 5s later
The problem comes out again
No
Correct the connection
Is the EEPROM chip plugged in PCB well?
Replace the PCB
8.3.2 Indoor / outdoor units communication protection(Only for M5OA-36HRDN1-Q model)
Disconnect the power supply, after 1
minute, connect the power supply , turn on
the unit with remote controller
Does the unit work
normally ?
No
Check the wiring between
indoor and outdoor unit. Is
the connection of L, N, S
and GND good?
Is the GND connection on
outdoor PCB good?
No
Reconnect and retest
in
Yes
Is the LED4(red) on
outdoor PCB bright and
LED1(yellow) blinking?
Replace indoor PCB
and repower on. Is
the failure cleared?
Yes
No
The power supply for
outdoor PCB is fail. Check
the wiring on outdoor PCB
comparing with wiring plate.
Is the connection good?
Yes
No
No
Replace outdoor e-box.
Correct the connection.
ODMI-1103-A
8.3.3 Zero-crossing signal error
Is power supply and
connection
of
connectors good?
No
Be sure the power supply
is good and correct the
connection
Yes
Indoor PCB is defective.
Replace the indoor PCB.
8.3.4 Fan speed out of control diagnosis
Shut off the power supply and turn on it 5s later
The unit does not work normally
Turn off the unit, rotate the indoor
fan.Does it rotate freely?
No
Disassemble
the
connection
between fan and motor, check if the
bearing is normal. If not, change the
bearing.If yes, follow the below step.
Yes
Is the indoor fan motor connector and
connection good?
Yes
Check the voltage of motor power
input .Is it in range of AC90-160V?
No
Replace the indoor PCB
Yes
Replace the indoor fan motor
ODMI-1103-A
8.3.5 Open or short circuit of temperature sensor diagnosis and solution.
Check the connections between
the sensors and the PCB. Are the
connections good?
Yes
Replace the sensor and check if
the errors happen again?
Yes
Replace outdoor PCB
8.3.6 Compressor voltage protection
Check the voltage of power supply, if the voltage is about 220V, turn off the power
supply to indoor unit and turn it on again after 1 minute
Does the trouble occur again?
Yes
Check the voltage of P,N port in IPM board.
If it is not higher than 310V, follow the below step.
No
Replace the IPM board
ODMI-1103-A
8.3.7 Communication malfunction between outdoor main chip and compressor control chip.
Check whether the IPM board has error display
No
Yes
Replace the outdoor PCB
Replace the IPM board
No
Replace the electric control box
No
ODMI-1103-A
8.3.8 Temperature protection of compressor discharge or compressor top.
No
Does
compressor
operate?
Yes
Is refrigerant
circulation
volume
normal?
Is
the
connection
good?
No
Reconnect and retest.
Yes
Is
protector
normal?
No
Replace the protector.
Yes
No
Charge
refrigerant
Check
the
outdoor
main
PCB. Is there
some problem?
Yes
Is abnormality
the same after
gas charging?
Replace the outdoor
PCB.
No
Check refrigerant system
(such as clogging of
capillary, etc)
ODMI-1103-A
8.3.9 Compressor current protection
Check the resistance of compressor, is it
normal?
No
Turn one indoor unit only, Does the compressor start
after 3 minutes?
No
The compressor is defective
No
Yes
The compressor is defective
Does the trouble occur again after compressor
running some time?
Yes
Check the refrigerant circulation volume and pressure
If refrigerant circulation volume and pressure is OK, change the outdoor main PCB.
ODMI-1103-A
8.3.10 Inverter module protection
Are the U,V,W connected to compressor and inverter module right?
No
Yes
Repair connector
Replace the IPM board
If the problem comes to again, check wingding resistance of inverter compressor, is it right?
No
Replace inverter compressor
8.3.11 Condenser high-temperature protection
When outdoor pipe temp. is more than 65°C, the unit will stop, and unit runs again when outdoor pipe
temp. less than 52°C.
Is the outdoor pipe temp. more than 65°C ?
No
Is the outdoor pipe temp sensor right according to the annex 1
Yes
Replace the outdoor main board
No
Replace the outdoor pipe temp sensor
ODMI-1103-A
8.3.12 PFC module protection
Check the voltage of power supply, if the voltage
is about 220V, turn off the power supply and
turn it on again after 1 minute
Does the unit work
normally ?
No
Check whether the
power supply of bridge
rectifiers input port is
normal.
No
Replace the
outdoor PCB
Yes
No
Check whether the power
supply of bridge rectifiers
output port is 325VDC
Replace bridge rectifiers
Yes
Check whether the
voltage between P and
N port in IPM is 380V.
No
Check whether
the PFC
inductance is
normal.
No
Yes
Yes
Check whether the
wiring between PCB
and PFC module is
normal.
Yes
Yes
Replace outdoor e-box.
Replace the PFC inductance
Replace PFC
ODMI-1103-A
Annex 1
Characteristic of temp. sensor
Temp.℃
Resistance KΩ
-10
62.2756
17
14.6181
44
4.3874
-9
58.7079
18
13.918
45
4.2126
-8
56.3694
19
13.2631
46
4.0459
-7
52.2438
20
12.6431
47
3.8867
-6
49.3161
21
12.0561
48
3.7348
-5
46.5725
22
11.5
49
3.5896
-4
44
23
10.9731
50
3.451
-3
41.5878
24
10.4736
51
3.3185
-2
39.8239
25
10
52
3.1918
-1
37.1988
26
9.5507
53
3.0707
0
35.2024
27
9.1245
54
2.959
1
33.3269
28
8.7198
55
2.8442
2
31.5635
29
8.3357
56
2.7382
3
29.9058
30
7.9708
57
2.6368
4
28.3459
31
7.6241
58
2.5397
5
26.8778
32
7.2946
59
2.4468
6
25.4954
33
6.9814
60
2.3577
7
24.1932
34
6.6835
61
2.2725
8
22.5662
35
6.4002
62
2.1907
9
21.8094
36
6.1306
63
2.1124
10
20.7184
37
5.8736
64
2.0373
11
19.6891
38
5.6296
65
1.9653
12
18.7177
39
5.3969
66
1.8963
13
17.8005
40
5.1752
67
1.830
14
16.9341
41
4.9639
68
1.7665
15
16.1156
42
4.7625
69
1.7055
16
15.3418
43
4.5705
70
1.6469
Temp.℃
Resistance KΩ
Temp.℃
Resistance KΩ
ODMI-1103-A
Annex 2
1. Reference voltage data:
a)
Rectifier : Input :220-230V(AC), output :310V(DC)
b)
Inverter module: U,V, W 3ph.
Result
U-V
60-150V(AC)
U-W
60-150V(AC)
V-W
60-150V(AC)
P-N
DC
310V
c)
Photo-couple PC817, PC851:
Control side <+5V, AC side :< 24V(AC)
d)
S terminal and N: changeable from 0-24V
2. Check the Diode Bridge component ( In wiring diagram, rectifier)
Remark: If this part is abnormal, the LED will not light.
~
+
-
~
Multi-meter
+
~
~
-
Result
_
+
~
~
Forward Resistance
Backward Resistance
Infinite
Infinite
~500 ohm
Infinite
~500 ohm
Infinite