Midea MV6-252WV2GN1 User manual

Commercial Air Conditioners
R410A
Series
MV6-252WV2GN1
MV6-280WV2GN1
MV6-335WV2GN1
MV6-400WV2GN1
MV6-450WV2GN1
MV6-500WV2GN1
MV6-560WV2GN1
MV6-615WV2GN1
MV6-670WV2GN1
MV6-730WV2GN1
MV6-785WV2GN1
MV6-850WV2GN1
MV6-900WV2GN1
Service
Manual

V6 VRF 50/60Hz
1
CONTENTS
CONTENTS
Part 1 General Information............................................................................ 3
Part 2 Components Layout and Refrigerant Circuits .................................. 11
Part 3 Control ............................................................................................... 33
Part 4 Field Settings..................................................................................... 49
Part 5 Electrical Components and Wiring Diagrams .................................. 55
Part 6 Diagnosis and Troubleshooting......................................................... 69

V6 VRF 50/60Hz
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Midea V6 Series Service Manual

V6 VRF 50/60Hz
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Part 1 - General Information
Part 1
General Information
1Indoor and Outdoor Unit Capacities .................................................. 4
2External Appearance ............................................................................ 6
3Outdoor Unit Combinations ................................................................ 8
4Combination Ratio ............................................................................... 9

V6 VRF 50/60Hz
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Midea V6 Series Service Manual
1Indoor and Outdoor Unit Capacities
1.1 Indoor Units
1.1.1 Standard indoor units
Table 1-1.1: Standard indoor unit abbreviation codes
Abbreviation
code Type
Abbreviation
code Type
Q1 One-way Cassette T1 High Static Pressure Duct
Q2 Two-way Cassette G Wall-mounted
Q4C Compact Four-way Cassette DL Ceiling & Floor
Q4 Four-way Cassette F Floor Standing
T2 Medium Static Pressure Duct Z Console
Table 1-1.2: Standard indoor unit capacity range
Capacity Capacity
index Q1 Q2 Q4C Q4 T2 T1 G DL F Z
kW HP
1.8 0.6 18 18 —————————
2.2 0.8 22 22 22 22 —22 —22 —22 22
2.8 1 28 28 28 28 28 28 —28 —28 28
3.6 1.25 36 36 36 36 36 36 —36 36 36 36
4.5 1.6 45 45 45 45 45 45 —45 45 45 45
5.6 2 56 56 56 —56 56 —56 56 56 —
7.1 2.5 71 71 71 —71 71 71 71 71 71 —
8.0 3 80 ———80 80 80 80 80 80 —
9.0 3.2 90 ———90 90 90 90 90 ——
10.0 3.6 100 ———100 ——————
11.2 4 112 ———112 112 112 —112 ——
14.0 5 140 ———140 140 140 —140 ——
16.0 6 160 ———160 160 160 —160 ——
20.0 7 200 —————200 ————
25.0 9 250 —————250 ————
28.0 10 280 —————280 ————
40.0 14 400 —————400 ————
45.0 16 450 —————450 ————
56.0 20 560 —————560 ————
1.1.2 Fresh air processing unit
Table 1-1.3: Fresh air processing unit capacity range
Capacity 12.5kW 14kW 20kW 25kW 28kW 45kW 56kW
Capacity index 125 140 200 250 280 450 560
Table 1-1.4: Small airflow rate fresh air processing unit capacity range
Capacity 14kW 22.4kW 28kW
Capacity index 140 224 280
1.2 Heat recovery ventilator
Table 1-1.5: Heat recovery ventilator capacity range
Airflow rate 200m3/h 300m3/h 400m3/h 500m3/h 800m3/h 1000m3/h 1500m3/h 2000m3/h

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Part 1 - General Information
1.3 Outdoor Units
Table 1-1.6: Outdoor unit capacity range
Capacity
Model Name
Combination Type
8HP
MV6-252WV2GN1
/
10HP
MV6-280WV2GN1
/
12HP
MV6-335WV2GN1
/
14HP
MV6-400WV2GN1
/
16HP
MV6-450WV2GN1
/
18HP
MV6-500WV2GN1
/
20HP
MV6-560WV2GN1
/
22HP
MV6-615WV2GN1
/
24HP
MV6-670WV2GN1
/
26HP
MV6-730WV2GN1
/
28HP
MV6-785WV2GN1
/
30HP
MV6-850WV2GN1
/
32HP
MV6-900WV2GN1
/
34HP
MV6-950WV2GN1
12HP+22HP
36HP
MV6-1015WV2GN1
14HP+22HP
38HP
MV6-1065WV2GN1
16HP+22HP
40HP
MV6-1120WV2GN1
12HP+28HP
42HP
MV6-1175WV2GN1
20HP+22HP
44HP
MV6-1230WV2GN1
22HP+22HP
46HP
MV6-1285WV2GN1
22HP+24HP
48HP
MV6-1345WV2GN1
22HP+26HP
50HP
MV6-1400WV2GN1
22HP+28HP
52HP
MV6-1460WV2GN1
26HP+26HP
54HP
MV6-1515WV2GN1
26HP+28HP
56HP
MV6-1570WV2GN1
28HP+28HP
58HP
MV6-1635WV2GN1
28HP+30HP
60HP
MV6-1685WV2GN1
28HP+32HP
62HP
MV6-1750WV2GN1
30HP+32HP
64HP
MV6-1800WV2GN1
32HP+32HP
66HP
MV6-1850WV2GN1
12HP+22HP+32HP
68HP
MV6-1915WV2GN1
14HP+22HP+32HP
70HP
MV6-1965WV2GN1
16HP+22HP+32HP
72HP
MV6-2020WV2GN1
12HP+28HP+32HP
74HP
MV6-2075WV2GN1
20HP+22HP+32HP
76HP
MV6-2130WV2GN1
22HP+22HP+32HP
78HP
MV6-2185WV2GN1
22HP+24HP+32HP
80HP
MV6-2245WV2GN1
22HP+26HP+32HP
82HP
MV6-2300WV2GN1
22HP+28HP+32HP
84HP
MV6-2360WV2GN1
26HP+26HP+32HP
86HP
MV6-2415WV2GN1
26HP+28HP+32HP
88HP
MV6-2470WV2GN1
28HP+28HP+32HP
90HP
MV6-2535WV2GN1
28HP+30HP+32HP
92HP
MV6-2585WV2GN1
28HP+32HP+32HP
94HP
MV6-2650WV2GN1
30HP+32HP+32HP
96HP
MV6-2700WV2GN1
32HP+32HP+32HP
Notes:
1. The combinations of units shown in the table are factory-recommended. Other combinations of units are also available.

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Midea V6 Series Service Manual
2External Appearance
2.1 Indoor Units
2.1.1 Standard indoor units
Table 1-2.1: Standard indoor unit appearance
One-way Cassette
Two-way Cassette
Q1
Q2
Compact Four-way Cassette
Four-way Cassette
Q4C
Q4
Medium Static Pressure Duct
High Static Pressure Duct
T2
T1
Wall-mounted
Ceiling & Floor
G
DL
Floor Standing
Console
F
Z
2.1.2 Fresh air processing unit
Table 1-2.2: Fresh air processing unit appearance
Fresh Air Processing Unit Small Airflow Rate Fresh Air Processing Unit
FA FA
2.2 Heat Recovery Ventilator
Table 1-2.3: Heat recovery ventilator appearance
Heat Recovery Ventilator

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Part 1 - General Information
2.3 Outdoor Units
2.3.1 Single units
Table 1-2.4: Single outdoor unit appearance
8/10/12HP
(with single fan)
14/16HP
(with single fan)
18/20/22HP
(with dual fans)
24/26/28/30/32HP
(with dual fans)
2.3.2 Combinations of units
Table 1-2.5: Combination outdoor unit appearance
34HP 36/38HP 40HP
42/44HP 46/48/50HP 52/54/56/58/60/62/64HP
66HP
68/70HP
72HP
74/76HP
78/80/82HP
84/86/88/90/92/94/96HP

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Midea V6 Series Service Manual
3Outdoor Unit Combinations
Table 1-3.1: Outdoor unit combinations
System capacity
Number
of units
Modules
1
Outdoor branch
joint kit
2
kW
HP
8
10
12
14
16
18
20
22
24
26
28
30
32
25.2
8
1
●
—
28.0
10
1
●
33.5
12
1
●
40.0
14
1
●
45.0
16
1
●
50.0
18
1
●
56.0
20
1
●
61.5
22
1
●
67.0
24
1
●
73.0
26
1
●
78.5
28
1
●
85.0
30
1
●
90.0
32
1
●
95.0
34
2
●
●
FQZHW-02N1E
101.5
36
2
●
●
106.5
38
2
●
●
112.0
40
2
●
●
117.5
42
2
●
●
123.0
44
2
●●
128.5
46
2
●
●
134.5
48
2
●
●
140.0
50
2
●
●
146.0
52
2
●●
151.5
54
2
●
●
157.0
56
2
●●
163.5
58
2
●
●
168.5
60
2
●
●
175.0
62
2
●
●
180.0
64
2
●●
185.0
66
3
●
●
●
FQZHW-03N1E
191.5
68
3
●
●
●
196.5
70
3
●
●
●
202.0
72
3
●
●
●
207.5
74
3
●
●
●
213.0
76
3
●●
●
218.5
78
3
●
●
●
224.5
80
3
●
●
●
230.0
82
3
●
●
●
236.0
84
3
●●
●
241.5
86
3
●
●
●
247.0
88
3
●●
●
253.5
90
3
●
●
●
258.5
92
3
●
●●
265.0
94
3
●
●●
270.0
96
3
●●●
Notes:
1. The combinations of units shown in the table are factory-recommended. Other combinations of units are also available.
2. For systems with two or more outdoor units, outdoor branch joints (sold separately) are required.

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Part 1 - General Information
4Combination Ratio
Table 1-4.1: Indoor and outdoor unit combination ratio limitations
Type Minimum
combination ratio
Maximum combination ratio
Standard indoor
units only
Fresh air processing
units only
Fresh air processing units and
standard indoor units together
V6 Series outdoor units
50%
130%
100%
100%1
Notes:
1. When fresh air processing units are installed together with standard indoor units, the total capacity of the fresh air processing units must not exceed 30%
of the total capacity of the outdoor units and the total combination ratio must not exceed 100%.
Table 1-4.2: Combinations of indoor and outdoor units
Outdoor unit capacity
Sum of capacity indexes of
connected indoor units (standard
indoor units only)
Sum of capacity indexes of connected indoor
units (fresh air processing units and standard
indoor units together)
Maximum number of
connected indoor
units
kW HP
Capacity
index
25.2
8
252
126 to 327.6
126 to 252
13
28.0
10
280
140 to 364
140 to 280
16
33.5
12
335
167.5 to 435.5
167.5 to 335
20
40.0
14
400
200 to 520
200 to 400
23
45.0
16
450
225 to 585
225 to 450
26
50.0
18
500
250 to 650
250 to 500
29
56.0
20
560
280 to 728
280 to 560
33
61.5
22
615
307.5 to 799.5
307.5 to 615
36
67.0
24
670
335 to 871
335 to 670
39
73.0
26
730
365 to 949
365 to 730
43
78.5
28
785
392.5 to 1020.5
392.5 to 785
46
85.0
30
850
425 to 1105
425 to 850
50
90.0
32
900
450 to 1170
450 to 900
53
95.0
34
950
475 to 1235
475 to 950
56
101.5
36
1015
507.5 to 1319.5
507.5 to 1015
59
106.5
38
1065
532.5 to 1384.5
532.5 to 1065
63
112.0
40
1120
560 to 1456
560 to 1120
64
117.5
42
1175
587.5 to 1527.5
587.5 to 1175
123.0
44
1230
615 to 1599
615 to 1230
128.5
46
1285
642.5 to 1670.5
642.5 to 1285
134.5
48
1345
672.5 to 1748.5
672.5 to 1345
140.0
50
1400
700 to 1820
700 to 1400
146.0
52
1460
730 to 1898
730 to 1460
151.5
54
1515
757.5 to 1969.5
757.5 to 1515
157.0
56
1570
785 to 2041
785 to 1570
163.5
58
1635
817.5 to 2125.5
817.5 to 1635
168.5
60
1685
842.5 to 2190.5
842.5 to 1685
175.0
62
1750
875 to 2275
875 to 1750
180.0
64
1800
900 to 2340
900 to 1800
185.0
66
1850
925 to 2405
925 to 1850
191.5
68
1915
957.5 to 2489.5
957.5 to 1915
196.5
70
1965
982.5 to 2554.5
982.5 to 1965
202.0
72
2020
1010 to 2626
1010 to 2020
207.5
74
2075
1037.5 to 2697.5
1037.5 to 2075
213.0
76
2130
1065 to 2769
1065 to 2130
218.5
78
2185
1092.5 to 2840.5
1092.5 to 2185
224.5
80
2245
1122.5 to 2918.5
1122.5 to 2245
230.0
82
2300
1150 to 2990
1150 to 2300
236.0
84
2360
1180 to 3068
1180 to 2360
241.5
86
2415
1207.5 to 3139.5
1207.5 to 2415
247.0
88
2470
1235 to 3211
1235 to 2470
253.5
90
2535
1267.5 to 3295.5
1267.5 to 2535
258.5
92
2585
1292.5 to 3360.5
1292.5 to 2585
265.0
94
2650
1325 to 3445
1325 to 2650
270.0
96
2700
1350 to 3510
1350 to 2700
Combination ratio = Sum of capacity indexes of the indoor units
Capacity index of the outdoor units

V6 VRF 50/60Hz
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Midea V6 Series Service Manual

V6 VRF 50/60Hz
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Part 2 - Components Layout and Refrigerant Circuits
Part 2
Components Layout and
Refrigerant Circuits
1Layout of Functional Components ....................................................... 12
2Piping Diagrams .................................................................................. 16
3Refrigerant Flow Diagrams .................................................................. 22

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Midea V6 Series Service Manual
1Layout of Functional Components
8/10/12HP
Figure 2-1.1: 8/10/12 layout of functional components
Legend
No. Parts name
1 Compressor
2 Temperature sensor for discharge gas
3 High pressure switch
4 High pressure sensor
5 Oil separator
6 Four-way valve
7 Heat exchanger
8 Electronic expansion valve (EXV)
9 Low pressure switch
10 Fan motor
11 Fan
12 Stop valve (liquid side)
13 Stop valve (gas side)
14 Plate heat exchanger
15 Accumulator
15
5
6
7
8
12 13 14
11
9
10
34 2 1

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Part 2 - Components Layout and Refrigerant Circuits
14/16HP
Figure 2-1.2: 14/16 layout of functional components
Legend
No. Parts name
1 Compressor
2 Temperature sensor for discharge gas
3 High pressure switch
4 High pressure sensor
5 Oil separator
6 Four-way valve
7 Heat exchanger
8 Electronic expansion valve (EXV)
9 Low pressure switch
10 Fan motor
11 Fan
12 Stop valve (liquid side)
13 Stop valve (gas side)
14 Plate heat exchanger
15 Accumulator
15
5
6
7
8
12 13 14
11
9
10
3
421

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Midea V6 Series Service Manual
18/20/22HP
Figure 2-1.3: 18/20/22 layout of functional components
Legend
No. Parts name
1 Compressor
2 Temperature sensor for discharge gas
3 High pressure switch
4 High pressure sensor
5 Oil separator
6 Four-way valve
7 Heat exchanger
8 Electronic expansion valve (EXV)
9 Low pressure switch
10 Fan motor
11 Fan
12 Stop valve (liquid side)
13 Stop valve (gas side)
14 Plate heat exchanger
15 Accumulator
155
6
7
8
12 13 14
11
9
10
3
421

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Part 2 - Components Layout and Refrigerant Circuits
24/26/28/30/32HP
Figure 2-1.4: 24/26/28/30/32 layout of functional components
Legend
No. Parts name
1 Compressor
2
Temperature sensor for
discharge gas
3 High pressure switch
4 High pressure sensor
5 Oil separator
6 Four-way valve
7 Heat exchanger
8
Electronic expansion valve
(EXV)
9 Low pressure switch
10 Fan motor
11 Fan
12 Stop valve (liquid side)
13 Stop valve (gas side)
14 Plate heat exchanger
15 Accumulator
15
54
6
7
8
9
12 13 14
11
9
10
3 2 1

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Midea V6 Series Service Manual
2Piping Diagrams
8/10/12HP
Figure 2-2.1: 8/10/12HP piping diagram
Legend
No. Parts name No. Parts name
1 Compressor 14 Plate heat exchanger
2 Discharge temperature switch 15 Accumulator
3 High pressure switch 16 Heat exchanger cooling electric control box
4 High pressure sensor T3 Heat exchanger temperature sensor
5 Oil separator T4 Outdoor ambient temperature sensor
6 Four-way valve T6A Plate heat exchanger inlet temperature sensor
7 Heat exchanger T6B Plate heat exchanger outlet temperature sensor
8 Electronic expansion valve (EXV) T7C1 Compressor A discharge temperature sensor
9 Low pressure switch T7C2 Discharge pipe temperature sensor
10 Fan motor SV4 Oil return valve
11 Fan SV5 Fast defrosting (in heating) and unloading (in cooling) valve
12 Stop valve (liquid side) SV6 Refrigerant bypass EXV valve
13 Stop valve (gas side) SV8A Compressor A vapor injection valve
7
115 12
9
3
2
45
6
11
10
9
14
8
8
13
EXVA
EXVC
ESC
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
SV6
16

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Part 2 - Components Layout and Refrigerant Circuits
14/16HP
Figure 2-2.2: 14/16HP piping diagram
Legend
No. Parts name No. Parts name
1 Compressor 15 Accumulator
2 Discharge temperature switch 16 Heat exchanger cooling electric control box
3 High pressure switch T3 Heat exchanger temperature sensor
4 High pressure sensor T4 Outdoor ambient temperature sensor
5 Oil separator T6A Plate heat exchanger inlet temperature sensor
6 Four-way valve T6B Plate heat exchanger outlet temperature sensor
7 Heat exchanger T7C1 Compressor A discharge temperature sensor
8 Electronic expansion valve (EXV) T7C2 Discharge pipe temperature sensor
9 Low pressure switch SV4 Oil return valve
10 Fan motor SV5 Fast defrosting (in heating) and unloading (in cooling) valve
11 Fan SV6 Refrigerant bypass EXV valve
12 Stop valve (liquid side) SV7 Refrigerant bypass indoor units valve
13 Stop valve (gas side) SV8A Compressor A vapor injection valve
14 Plate heat exchanger
2
115 12
9
3
45
6
11
10
7
14
88
8
13
EXVAEXVB
EXVC
ESC
T3
T4
T7C1
T7C2
T6B
T6A
SV8A
SV4
SV7
SV5
SV6
16

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Midea V6 Series Service Manual
18/20/22HP
Figure 2-2.3: 18/20/22HP piping diagram
Legend
No. Parts name No. Parts name
1 Compressor 15 Accumulator
2 Discharge temperature switch 16 Heat exchanger cooling electric control box
3 High pressure switch T3 Heat exchanger temperature sensor
4 High pressure sensor T4 Outdoor ambient temperature sensor
5 Oil separator T6A Plate heat exchanger inlet temperature sensor
6 Four-way valve T6B Plate heat exchanger outlet temperature sensor
7 Heat exchanger T7C1 Compressor A discharge temperature sensor
8 Electronic expansion valve (EXV) T7C2 Compressor B discharge temperature sensor
9 Low pressure switch SV4 Oil return valve
10 Fan motor SV5 Fast defrosting (in heating) and unloading (in cooling) valve
11 Fan SV6 Refrigerant bypass EXV valve
12 Stop valve (liquid side) SV8A Compressor A vapor injection valve
13 Stop valve (gas side) SV8B Compressor B vapor injection valve
14 Plate heat exchanger SV9 Compressor B pressure balance valve
7
1115 12
9
3
45
6
11 11
10 10
14
8
8
8
13
EXVB
EXVA
EXVC
ESCT3
T4
2
T7C1 T7C2
T6B
T6A
SV8A SV8B
SV9
SV4
SV5
SV6
2
16

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Part 2 - Components Layout and Refrigerant Circuits
24/26/28HP
Figure 2-2.4: 24/26/28HP piping diagram
Legend
No. Parts name No. Parts name
1 Compressor 15 Accumulator
2 Discharge temperature switch 16 Heat exchanger cooling electric control box
3 High pressure switch T3 Heat exchanger temperature sensor
4 High pressure sensor T4 Outdoor ambient temperature sensor
5 Oil separator T6A Plate heat exchanger inlet temperature sensor
6 Four-way valve T6B Plate heat exchanger outlet temperature sensor
7 Heat exchanger T7C1 Compressor A discharge temperature sensor
8 Electronic expansion valve (EXV) T7C2 Compressor B discharge temperature sensor
9 Low pressure switch SV4 Oil return valve
10 Fan motor SV5 Fast defrosting (in heating) and unloading (in cooling) valve
11 Fan SV6 Refrigerant bypass EXV valve
12 Stop valve (liquid side) SV8A Compressor A vapor injection valve
13 Stop valve (gas side) SV8B Compressor B vapor injection valve
14 Plate heat exchanger SV9 Compressor B pressure balance valve
7
1
115 15 12
9
3
45
6
11 10
11 10
14
8
8
8
SV6
13
EXVB
EXVA
EXVC
E
SCT3
T4
T6B
T6A
SV8A
SV8B
SV4
SV9
SV5
T7C1 T7C2
22
16