Midea M2OC-14HRDN1 Operating manual

ODMI-A-1202
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

CONTENTS
1. General information of Outdoor Units ................................... 3
2. Features .................................................................................. 4
3. Dimensions ............................................................................. 5
4. Wiring Diagram ....................................................................... 6
5. Refrigeration Cycle Diagram ................................................ 11
6. Indoor units combination ..................................................... 13
7. Electronic control function .................................................. 15
8. Troubleshooting ................................................................... 24

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

2. Features
The hydrophilic fin can improve the heating efficiency at operation mode.
It is only operated in the heating operation mode ex
cept 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

3. Dimensions
More than 30cm
More than 60cm
More than 70cm
More than 30cm
More than 60cm
(Service space
Fence or
obstacles
MODEL W D H W1 A B
M2OC-14HRDN1-Q
M2OC-14HRDN1 760 285 590 823 530 290
M2OC-18HRDN1 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 845 320 700 908 560 335
M4OC-27HRDN1
M4OC1-27HRDN1-Q 900 315 860 980 590 333
M4OC-36HRDN1-Q
M5OA-36HRDN1-Q 990 345 965 1075 624 366

4. Wiring Diagram
4.1 M2OC-14HRDN1-Q
4.2 M2OC-14HRDN1

4.3 M2OC1-18HRDN1-Q
4.4 M3OC1-21HRDN1-Q M3OC1-27HRDN1-Q M3OC-27HRDN1

4.5 M2OC-18HRDN1
4.6 M4OC-24HRDN1-Q

4.7 M4OC1-27HRDN1-Q、M4OC-27HRDN1
4.8 M4OC-36HRDN1-Q

4.9 M5OA-36HRDN1-Q

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

5.4 Refrigeration circuit drawing of inverter quintuple type

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. And the 18k indoor unit
should only be wall mounted 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 7+9+9+12
Note: The 18k indoor unit should only be wall mounted unit.

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
6.8 Indoor unit combination for M5OA-36HRDN1-Q
One Unit Two Unit Three Unit
7 7+7 9+12 7+7+7 7+9+18 9+9+18 12+18+18
9 7+9 9+18 7+7+9 7+12+12 9+12+12 18+18+18
12 7+12 12+12 7+7+12 7+12+18 9+12+18
18 7+18 12+18 7+7+18 7+18+18 9+18+18
9+9 18+18 7+9+9 9+9+9 12+12+12
7+9+12 9+9+12 12+12+18
Four Unit
7+7+7+7 7+7+9+18 7+9+9+18 7+12+18+18 9+9+18+18
7+7+7+9 7+7+12+12 7+9+12+12 9+9+9+9 9+12+12+12
7+7+7+12 7+7+12+18 7+9+12+18 9+9+9+12 9+12+12+18
7+7+7+18 7+7+18+18 7+9+18+18 9+9+9+18 12+12+12+12
7+7+9+9 7+9+9+9 7+12+12+12 9+9+12+12 12+12+12+18
7+7+9+12 7+9+9+12 7+12+12+18 9+9+12+18
Five Unit
7+7+7+7+7 7+7+7+9+18 7+7+9+12+18 7+9+9+12+18 9+9+9+12+12
7+7+7+7+9 7+7+7+12+18 7+7+12+12+18 7+9+12+12+12 9+9+9+12+18
7+7+7+7+12 7+7+7+18+18 7+9+9+9+9 7+9+12+12+18 9+9+12+12+12
7+7+7+7+18 7+7+9+9+9 7+9+9+9+12 9+9+9+9+9 9+12+12+12+12
7+7+7+9+9 7+7+9+9+12 7+9+9+9+18 9+9+9+9+12 12+12+12+12+12
7+7+7+9+12 7+7+9+9+18 7+9+9+12+12 9+9+9+9+18
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

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 Off:0, Cooling:1, Heating:2
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

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
Power supply of outdoor unit AD data
18 Indoor unit number The indoor unit can communicate with outdoor unit well.
19 The last error or protection code 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
The capacity unit is horse power. If the indoor unit is not
connected, the digital display tube will show: “――”
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
14
The frequency corresponding to the total
indoor units amendatory capacity demand
15
The frequency after the frequency limit
16
The frequency sending to compressor control
chip
17
A indoor unit evaporator outlet temp.(T2BA)
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: “――”
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)

27
A indoor unit evaporator outlet temp.(T2BA)
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: “――”
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) 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.)
35
AD value of current
The display value is hex number.
36
AD value of voltage
37
EXV open angle for A indoor unit
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.)
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 Frequency limit symbol
Bit7 0 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.
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
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
7.4.2 Running mode:
Display Corresponding mode
0 Off
1 Cooling mode
2 Heating mode

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.

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

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 freq℃uency 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
VOLLIMT1
VOLTAGE
No limit
VOLLIMT2
VOLLIMT3
Off
VOLFRE2
VOLFRE1
VOLREL1
VOLREL2
VOLREL3
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,
VOLT_RST1_ADD
VOLTAGE
No limit
VOLT_LTM1_ADD
VOLT_RST2_ADD
VOLT_LTM2_ADD
VOLT_LTM_FREQ1_ADD
VOLT_LTM_FREQ2_ADD