Midea V6-i Series User manual

Commercial Air Conditioners
R410A
Series
MV6-i252WV2GN1-E
MV6-i280WV2GN1-E
MV6-i335WV2GN1-E
MV6-i400WV2GN1-E
MV6-i450WV2GN1-E
MV6-i500WV2GN1-E
MV6-i560WV2GN1-E
MV6-i615WV2GN1-E
MV6-i670WV2GN1-E
MV6-i730WV2GN1-E
MV6-i785WV2GN1-E
MV6-i850WV2GN1-E
MV6-i900WV2GN1-E
Service
Manual

V6-i VRF 50/60Hz
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CONTENTS
CONTENTS
Part 1 General Information............................................................................ 3
Part 2 Component 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

V5 X VRF 50/60Hz
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Midea V6-i Series Service Manual

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

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Midea V6-i Series Engineering Data Book
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
—
—
—
—
—
—
—
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
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
—
—
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
Capacity index
125
140
200
250
280
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

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Part 1 - General Information
1.3 Outdoor Units
Table 1-1.5: Outdoor unit capacity range
Capacity
Model Name
8HP
MV6-i252WV2GN1-E
10HP
MV6-i280WV2GN1-E
12HP
MV6-i335WV2GN1-E
14HP
MV6-i400WV2GN1-E
16HP
MV6-i450WV2GN1-E
18HP
MV6-i500WV2GN1-E
20HP
MV6-i560WV2GN1-E
22HP
MV6-i615WV2GN1-E
24HP
MV6-i670WV2GN1-E
26HP
MV6-i730WV2GN1-E
28HP
MV6-i785WV2GN1-E
30HP
MV6-i850WV2GN1-E
32HP
MV6-i900WV2GN1-E

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Midea V6-i Series Engineering Data Book
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
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
Table 1-2.4: Outdoor unit appearance
8/10/12HP
(with single fan)
14/16/18HP
(with single fan)
20/22HP
(with dual fans)
24/26/28/30/32HP
(with dual fans)

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Midea V6-i Series Engineering Data Book
3Combination Ratio
Table 1-5.1: 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-i 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 capacity of the outdoor unit and the combination ratio must not exceed 100%.
Table 1-5.2: 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
Combination ratio =
Sum of capacity indexes of the indoor units
Capacity index of the outdoor unit

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Part 2 - Component Layout and Refrigerant Circuits
Part 2
Component Layout and
Refrigerant Circuits
1Layout of Functional Components ....................................................... 10
2Piping Diagrams .................................................................................. 16
3Refrigerant Flow Diagrams .................................................................. 22

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Midea V6-i 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
Discharge temperature switch
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
56
7
8
12 13 14
11
9
10
34 2 1

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Part 2 - Component Layout and Refrigerant Circuits
14/16/18HP
Figure 2-1.2: 14/16/18 layout of functional components
Legend
No.
Parts name
1
Compressor
2
Discharge temperature switch
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
9
12 13 14
11
9
10
3
421

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Midea V6-i Series Service Manual
20/22HP
Figure 2-1.3: 20/22 layout of functional components
Legend
No.
Parts name
1
Compressor
2
Discharge temperature switch
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)
15
Accumulator
1556
7
8
9
12 13
11
9
10
3
421

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Part 2 - Component Layout and Refrigerant Circuits
24HP
Figure 2-1.4: 24 layout of functional components
Legend
No.
Parts name
1
Compressor
2
Discharge temperature switch
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)
15
Accumulator
15
54
6
7
8
9
12 13
11
9
10
321

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Midea V6-i Series Service Manual
26/28HP
Figure 2-1.5: 26/28 layout of functional components
Legend
No.
Parts name
1
Compressor
2
Discharge temperature switch
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
321

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Part 2 - Component Layout and Refrigerant Circuits
30/32HP
Figure 2-1.6: 30/32 layout of functional components
Legend
No.
Parts name
1
Compressor
2
Discharge temperature switch
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
321

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Midea V6-i 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
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)
7
115 12
9
3
2
45
6
11
10
14
8
8
13
EXVA
EXVC
ESC
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
SV6

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Part 2 - Component Layout and Refrigerant Circuits
14/16/18HP
Figure 2-2.2: 14/16/18HP 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
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)
SV7
Refrigerant bypass indoor units valve
13
Stop valve (gas side)
SV8A
Compressor A vapor injection valve
115 12
9
3
45
6
11
10
7
14
8
8
13
EXVA
EXVC
ESC
SV8A
SV4
SV7
SV5
SV6
T3
T4
T6B
T6A
2
T7C1
T7C2

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Midea V6-i Series Service Manual
20/22/24HP
Figure 2-2.3: 20/22/24HP piping diagram
Legend
No.
Parts name
No.
Parts name
1
Compressor
15
Accumulator
2
Discharge temperature switch
T3
Heat exchanger temperature sensor
3
High pressure switch
T4
Outdoor ambient temperature sensor
4
High pressure sensor
T6A
Plate heat exchanger inlet temperature sensor
5
Oil separator
T6B
Plate heat exchanger outlet temperature sensor
6
Four-way valve
T7C1
Compressor A discharge temperature sensor
7
Heat exchanger
T7C2
Compressor B discharge temperature sensor
8
Electronic expansion valve (EXV)
SV4
Oil return valve
9
Low pressure switch
SV5
Fast defrosting (in heating) and unloading (in cooling) valve
10
Fan motor
SV6
Refrigerant bypass EXV valve
11
Fan
SV8A
Compressor A vapor injection valve
12
Stop valve (liquid side)
SV8B
Compressor B vapor injection valve
13
Stop valve (gas side)
SV9
Compressor B pressure balance valve
14
Plate heat exchanger
7
1115 12
9
3
45
6
11 11
10 10
8
13
EXVA
ESC
SV9
SV4
SV5
SV6
SV2
T3
T4
2
T7C1 T7C2
2

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