Midea V6R VRF Series User manual

Commercial Air Conditioners
R410A
Service
Manual
MV6-R252WV2RN1
MV6-R280WV2RN1
MV6-R335WV2RN1
MV6-R400WV2RN1
MV6-R450WV2RN1
MV6-R500WV2RN1
Series VRF

V6R VRF 50Hz
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CONTENTS
CONTENTS
Part 1 General Information ........................................................................ 3
Part 2 Component Layout and Refrigerant Circuits ................................ 13
Part 3 Control............................................................................................ 25
Part 4 Field Settings ................................................................................. 51
Part 5 Electrical Components and Wiring Diagrams............................... 57
Part 6 Diagnosis and Troubleshooting ..................................................... 83

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Midea V6R Series Service Manual

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Part 1 - General Information
Part 1
General Information
1 Indoor and Outdoor Unit Capacities...................................................... 4
2 External Appearance ................................................................................ 5
3 Outdoor Unit Combinations .................................................................. 10
4 Combination Ratio ................................................................................. 11

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Midea V6R Series Service Manual
1Indoor and Outdoor Unit Capacities
1.1 Indoor Units
1.1.1 VRF 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: Indoor unit capacity range
Capacity
Capacity
index
Q1
Q2
Q4C
Q4
T2
T1
G
DL
F
Z
kW
kBtu/h
HP
1.8
5
0.6
18
18
—
—
—
—
—
—
—
—
—
2.2
7
0.8
22
22
22
22
—
22
—
22
—
22
22
2.8
9
1
28
28
28
28
28
28
—
28
—
28
28
3.6
12
1.25
36
36
36
36
36
36
—
36
36
36
36
4.5
15
1.6
45
45
45
45
45
45
—
45
45
45
45
5.6
19
2
56
56
56
—
56
56
—
56
56
56
—
7.1
24
2.5
71
71
71
—
71
71
71
71
71
71
—
8.0
27
3
80
—
—
—
80
80
80
80
80
80
—
9.0
30
3.2
90
—
—
—
90
90
90
90
90
—
—
10.0
34
3.6
100
—
—
—
100
—
—
—
—
—
—
11.2
38
4
112
—
—
—
112
112
112
—
112
—
—
14.0
48
5
140
—
—
—
140
140
140
—
140
—
—
16.0
55
6
160
—
—
—
160
160
160
—
160
—
—
20.0
68
7
200
—
—
—
—
—
200
—
—
—
—
25.0
85
9
250
—
—
—
—
—
250
—
—
—
—
28.0
96
10
280
—
—
—
—
—
280
—
—
—
—
Notes:
1. V6R series outdoor units are compatible with the 2nd generation DC VRF indoor unit and 2nd generation AC VRF indoor units (which will be released soon).

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Part 1 - General Information
1.1.2 Fresh air processing unit
Table 1-1.3: Fresh air processing unit capacity range
Capacity
12.5kW
14kW
20kW
25kW
28kW
Capacity index
125
140
200
250
280
Notes:
1. V6R series outdoor units are compatible with the 2nd generation DC Fresh air processing unit.
1.2 Heat recovery ventilator
Table 1-1.4: Heat recovery ventilator capacity range
Capacity
200m3/h
300m3/h
400m3/h
500m3/h
800m3/h
1000m3/h
1500m3/h
2000m3/h
Notes:
1. V6R series outdoor units are compatible with the DC type heat recovery ventilator.
1.3 High Temperature Hydro Module
Table 1-1.5: 1.3 High Temperature Hydro Module capacity range
Capacity
14kW
Capacity index
140
1.4 Outdoor Units
Table 1-1.6: Outdoor unit capacity range
Capacity
Model Name
Combination Type
8HP
MV6-R252WV2RN1
/
10HP
MV6-R280WV2RN1
/
12HP
MV6-R335WV2RN1
/
14HP
MV6-R400WV2RN1
/
16HP
MV6-R450WV2RN1
/
18HP
MV6-R500WV2RN1
/
20HP
MV6-R560WV2RN1
10HP+10HP
22HP
MV6-R615WV2RN1
10HP+12HP
24HP
MV6-R680WV2RN1
10HP+14HP
26HP
MV6-R735WV2RN1
12HP+14HP
28HP
MV6-R785WV2RN1
12HP+16HP
30HP
MV6-R835WV2RN1
12HP+18HP
32HP
MV6-R900WV2RN1
16HP+16HP
34HP
MV6-R950WV2RN1
16HP+18HP
36HP
MV6-R1000WV2RN1
18HP+18HP
38HP
MV6-R1070WV2RN1
12HP+12HP+14HP
40HP
MV6-R1120WV2RN1
12HP+12HP+16HP
42HP
MV6-R1185WV2RN1
12HP+14HP+16HP
44HP
MV6-R1235WV2RN1
12HP+16HP+16HP
46HP
MV6-R1300WV2RN1
14HP+16HP+16HP
48HP
MV6-R1350WV2RN1
16HP+16HP+16HP
50HP
MV6-R1400WV2RN1
16HP+16HP+18HP
52HP
MV6-R1450WV2RN1
16HP+18HP+18HP
54HP
MV6-R1500WV2RN1
18HP+18HP+18HP
Notes:
1. The combinations of units shown in the table are factory-recommended. Other combinations of units are also possible.

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Midea V6R Series Service Manual
2External Appearance
2.1 Indoor Units
Table 1-2.1: 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
2.1.1 Fresh air processing unit
Table 1-2.2: Fresh air processing unit appearance
Fresh Air Processing Unit
FA

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Part 1 - General Information
2.2 Heat Recovery Ventilator
Table 1-2.3: Heat recovery ventilator appearance
Heat Recovery Ventilator
2.3 High Temperature Hydro Module
Table 1-2.4: High temperature Hydro module appearance
High Temperature Hydro Module

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Midea V6R Series Service Manual
2.4 Outdoor Units
2.4.1 Single units
Table 1-2.5: Single outdoor unit appearance
8/10/12HP
(with single fan)
14/16/18HP
(with dual fan)
2.4.2 Combinations of units
Table 1-2.6: Combination outdoor unit appearance
20/22HP
24/26/28/30HP
32/34/36HP
38/40HP
42/44HP
46/48/50/52/54HP

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Part 1 - General Information
2.5 Mode Selection Box
Table 1-2.7: MS box appearance
Model name
Appearance
Max. number of
downstream indoor
units
MS01/N1-D1,2
8
MS04/N1-D
20
MS06/N1-D
30
MS08/N1-D
40
MS10/N1-D
47
MS12/N1-D
47
Notes:
1. MS01 can be ceiling-suspended installed and wall-mounted installed.
2. Low temperature cooling operation and leakage detection function are available in MS01.

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Midea V6R Series Service Manual
3Outdoor Unit Combinations
Table 1-3.1: Outdoor unit combinations
System capacity
Number
of units
Modules1
Outdoor branch
joint kit2
kW
HP
8
10
12
14
16
18
22.4
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
2
●●
FQZHW-02SB1
61.5
22
2
●
●
68.0
24
2
●
●
73.5
26
2
●
●
78.5
28
2
●
●
83.5
30
2
●
●
90.0
32
2
●●
95.0
34
2
●
●
100.0
36
2
●●
107.0
38
3
●●
●
FQZHW-03SB1
112.0
40
3
●●
●
118.5
42
3
●
●
●
123.5
44
3
●
●●
130.0
46
3
●
●●
135.0
48
3
●●●
140.0
50
3
●●
●
145.0
52
3
●
●●
150.0
54
3
●●●
Notes:
1. The combinations of units shown in the table are factory-recommended. Other combinations of units are also possible.
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
Total
combination ratio
Allowed combination ratio
VRF indoor units1
HT hydro
module
AHU
Fresh air
processing units
VRF indoor units only
50%~200% (Single)
50%~150% (2 units
combination)
50%~130% (3 units
combination)
50%~200% (Single)
50%~150% (2 units
combination)
50%~130% (3 units
combination)
/
/
/
V6R indoor units + HT hydro
module units
50%~200%
50%~130%
0%~100%2
/
/
V6R indoor units + AHUs
50%~100%
50%~100%
/
0%~50%3
/
V6R indoor units + fresh air
processing units
50%~100%
50%~100%
/
/
0%~30%3
Fresh air processing units only
50%~100%
/
/
/
/
Notes:
1. V6R series outdoor units are compatible with the 2nd generation DC VRF indoor unit and 2nd generation AC VRF indoor units (which will be released
soon).
2. When HT hydro module units are installed together with VRF indoor units, the total capacity of HT hydro module units must not exceed 100% of the total
capacity of the outdoor units and the combination ratio must not exceed 200%.
3. When AHUs are installed together with VRF indoor units, the total capacity of AHUs must not exceed 50% of the total capacity of the outdoor units and the
combination ratio must not exceed 100%.
4. When fresh air processing units are installed together with VRF 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 combination ratio must not exceed 100%.
Combination ratio =
Sum of capacity indexes of the indoor units
Capacity index of the outdoor units

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Midea V6R Series Service Manual
Table 1-4.2: Combinations of indoor and outdoor units
Outdoor unit capacity
Sum of capacity indexes
Maximum
number of
connected
indoor
units1
kW
HP
Capacity
index
VRF indoor units
only
VRF indoor units
+ HT hydro
module
VRF indoor units
+ AHUs
VRF indoor units +
fresh air processing
units
22.4
8
224
112 to 291.2
112 to 448
112 to 224
112 to 224
64
28
10
280
140 to 364
140 to 560
140 to 280
140 to 280
33.5
12
335
167.5 to 435.5
167.5 to 670
167.5 to 335
167.5 to 335
40
14
400
200 to 520
200 to 800
200 to 400
200 to 400
45
16
450
225 to 585
225 to 900
225 to 450
225 to 450
50
18
500
250 to 650
250 to 1000
250 to 500
250 to 500
56
20
560
280 to 728
280 to 1120
280 to 560
280 to 560
61.5
22
615
307.5 to 799.5
307.5 to 1230
307.5 to 615
307.5 to 615
68
24
680
340 to 884
340 to 1360
340 to 680
340 to 680
73.5
26
735
367.5 to 955.5
367.5 to 1470
367.5 to 735
367.5 to 735
78.5
28
785
392.5 to 1020.5
392.5 to 1570
392.5 to 785
392.5 to 785
83.5
30
835
417.5 to 1085.5
417.5 to 1670
417.5 to 835
417.5 to 835
90
32
900
450 to 1170
450 to 1800
450 to 900
450 to 900
95
34
950
475 to 1235
475 to 1900
475 to 950
475 to 950
100
36
1000
500 to 1300
500 to 2000
500 to 1000
500 to 1000
107
38
1070
535 to 1391
535 to 2140
535 to 1070
535 to 1070
112
40
1120
560 to 1456
560 to 2240
560 to 1120
560 to 1120
118.5
42
1185
592.5 to 1540.5
592.5 to 2370
592.5 to 1185
592.5 to 1185
123.5
44
1235
617.5 to 1605.5
617.5 to 2470
617.5 to 1235
617.5 to 1235
130
46
1300
650 to 1690
650 to 2600
650 to 1300
650 to 1300
135
48
1350
675 to 1755
675 to 2700
675 to 1350
675 to 1350
140
50
1400
700 to 1820
700 to 2800
700 to 1400
700 to 1400
145
52
1450
725 to 1885
725 to 2900
725 to 1450
725 to 1450
150
54
1500
750 to 1950
750 to 3000
750 to 1500
750 to 1500
Notes:
1. The Maximum number of connected indoor units depend upon indoor unit type and total combination ratio.

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Part 2 - Component Layout and Refrigerant Circuits
Part 2
Component Layout and
Refrigerant Circuits
1 Layout of Functional Components........................................................ 14
2 Piping Diagrams ..................................................................................... 16
3 Refrigerant Flow Diagrams .................................................................... 19

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Midea V6R Series Service Manual
1Layout of Functional Components
8/10/12HP
Figure 2-1.1: 8/10/12HP top view
Figure 2-1.2: 8/10/12HP front view
12345
16
17
678
18
12 131110914 15
20
19
21
Legend
No.
Parts name
1
Inverter compressor
2
Discharge temperature switch
3
Plate heat exchanger
4
Electronic expansion valve (EEVC)
5
Stop valve (liquid side)
6
Stop valve (high pressure gas side)
7
Stop valve (low pressure gas side)
8
Refrigerant charge solenoid valve(SVC)
(customization option)
9
Electronic expansion valve (EEVA)
10
High pressure sensor
11
Hot gas bypass solenoid valve(SV7)
12
Low pressure sensor
13
Oil separator
14
High pressure switch
15
Gas-liquid separator
16
Heat exchanger
17
Compressor vapor injection valve ( SV8A)
18
Injection bypass solenoid valve(SV5)
19
FAN A
20
4-way valve
21
Pressure relief valve (customization option)

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Part 2 - Component Layout and Refrigerant Circuits
14/16/18HP
Figure 2-1.3: 14/16/18HP top view
Figure 2-1.4: 14/16/18HP front view
123
4
56
14
15
12 13
11
109
7
8
17
20
16
22
21
19
18
Legend
No.
Parts name
1
Inverter compressor
2
Discharge temperature switch
3
Plate heat exchanger
4
Electronic expansion valve (EEVC)
5
Stop valve (liquid side)
6
Stop valve (high pressure gas side)
7
Stop valve (low pressure gas side)
8
Electronic expansion valve (EEVA)
9
High pressure sensor
10
Hot gas bypass solenoid valve(SV7)
11
Low pressure sensor
12
Oil separator
13
High pressure switch
14
Gas-liquid separator
15
Heat exchanger
16
FAN B
17
Compressor vapor injection valve ( SV8A)
18
Refrigerant charge solenoid valve(SVC)
(customization option)
19
Pressure relief valve (customization option)
20
4-way valve
21
Injection bypass solenoid valve(SV5)
22
FAN A

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Midea V6R Series Service Manual
2Piping Diagrams
Figure 2-2.1: 8HP/10HP/12HP piping diagram
Legend
No.
Parts name
No.
Parts name
1
Inverter compressor
17
Compressor vapor injection valve ( SV8A)
2
Discharge temperature switch
18
Injection bypass solenoid valve(SV5)
3
Plate heat exchanger
19
FAN A
4
Electronic expansion valve (EEVC)
20
4-way valve
5
Stop valve (liquid side)
21
Pressure relief valve (customization option)
6
Stop valve (high pressure gas side)
Sensor Code
Description
7
Stop valve (low pressure gas side)
T3
Heat exchanger deicer temperature sensor
8
Refrigerant charge solenoid valve(SVC) (customization option)
T4
Outdoor air temperature sensor
9
Electronic expansion valve (EEVA)
T5
Liquid pipe temperature sensor
10
High pressure sensor
T6A
Injection liquid temperature sensor
11
Hot gas bypass solenoid valve(SV7)
T6B
Subcooling gas temperature sensor
12
Low pressure sensor
T7
Suction temperature sensor
13
Oil separator
T8
Heat exchanger gas temperature sensor
14
High pressure switch
T9
Heat sink temperature sensor
15
Gas-liquid separator
TL
Heat exchanger liquid temperature sensor
16
Heat exchanger
T7C1
Compressor discharge temperature sensor

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Part 2 - Component Layout and Refrigerant Circuits
Figure 2-2.2: 14HP/16HP/18HP piping diagram
Legend
No.
Parts name
No.
Parts name
1
Inverter compressor
18
Refrigerant charge solenoid valve(SVC) (customization option)
2
Discharge temperature switch
19
Pressure relief valve (customization option)
3
Plate heat exchanger
20
4-way valve
4
Electronic expansion valve (EEVC)
21
Injection bypass solenoid valve(SV5)
5
Stop valve (liquid side)
22
FAN A
6
Stop valve (high pressure gas side)
Sensor Code
Description
7
Stop valve (low pressure gas side)
T3
Heat exchanger deicer temperature sensor
8
Electronic expansion valve (EEVA)
T4
Outdoor air temperature sensor
9
High pressure sensor
T5
Liquid pipe temperature sensor
10
Hot gas bypass solenoid valve(SV7)
T6A
Injection liquid temperature sensor
11
Low pressure sensor
T6B
Subcooling gas temperature sensor
12
Oil separator
T7
Suction temperature sensor
13
High pressure switch
T8
Heat exchanger gas temperature sensor
14
Gas-liquid separator
T9
Heat sink temperature sensor
15
Heat exchanger
TL
Heat exchanger liquid temperature sensor
16
FAN B
T7C1
Compressor discharge temperature sensor
17
Compressor vapor injection valve ( SV8A)

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Midea V6R Series Service Manual
Key components:
1. Oil separator:
Separates oil from gas refrigerant pumped out of the compressor and quickly returns it to the compressor. Separation
efficiency is up to 99%.
2. Gas-liquid separator:
Separates liquid refrigerant from gas refrigerant, stores liquid refrigerant and oil to protect compressor from liquid
hammering.
3. Electronic expansion valve (EEV):
Controls refrigerant flow and reduces refrigerant pressure.
4. Four-way valve:
Controls heat exchanger function. When open, the heat exchanger functions as an evaporator; When closed, the heat
exchanger functions as a condenser. Refer to part 3, “Heat Exchanger Control”.
5. Plate heat exchanger:
In cooling mode, it can improve super-cooling degree and the super-cooled refrigerant can achieve better heat exchange
in indoor side. In heating mode, the refrigerant comes from the plate heat exchanger going to the compressor can
enhance the refrigerant enthalpy and improve the heating capacity in low ambient temperature. Refrigerant volume in
plate heat exchanger is controlled according to temperature different between plate heat exchanger inlet and outlet or
the temperature different between discharge temperature and target discharge temperature.
6. Solenoid valve SV5:
Controls the refrigerant from plate heat exchanger to gas-liquid separator.
7. Solenoid valve SV7:
Bypass pressure at start-up stage and control capacity at low load condition; High-pressure-rise prevention; Discharge
superheat protection.
8. Solenoid valve SV8A
Allows refrigerant from plate heat exchanger inject directly to the compressor. SV8A opens when compressor startup
and closes when compressor stop.
9. High pressure switch
Regulate system pressure. When system pressure rises above the upper limit, the high pressure switch turn off, stopping
the compressor. When the high pressure protection recovers, the compressor restarts.

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Part 2 - Component Layout and Refrigerant Circuits
3Refrigerant Flow Diagrams
Cooling operation
Figure 2-3.1: Refrigerant flow during cooling operation
EXV
EVAP
T2b
T1
T2
EXV
EVAP
T2b
T1
T2
EXV
EVAP
T2b
T1
T2
EXV
T2b
T1
T2
T7C1
T3
TL T9
T8
T6A
T6B
T7
E S C
EXVA
T5
T4
Cooling Mode Thermo-ON Cooling Mode Thermo-ON Cooling Mode Thermo-ON OFF
MS box
10
13
1
14
20
16
93
4
18
12
11
15
5
6
7
19
17
High pressure Gas High pressure Liquid/Gas Medium pressure Gas
Low pressure Gas
2