Midea MV6-i252WV2GN1-E, MV6-i450WV2GN1-E, MV6-i280WV2GN1-E, MV6-i335WV2GN1-E, MV6-i400WV2GN1-E Service 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
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
1
V5 X VRF 50/60Hz
Midea V6-i Series Service Manual
2
V6-i VRF 50/60Hz
Part 1
- General Information
Part 1
General Information
1 Indoor and Outdoor Unit Capacities .................................................. 4
2 External Appearance ............................................................................ 6
3 Combination Ratio ................................................................................ 8
3
V6-i VRF 50/60Hz
Midea V6-i Series Engineering Data Book
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
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
— — —
—
Capacity
12.5kW
14kW
20kW
25kW
28kW
Capacity index
125
140
200
250
280
Capacity
200m3/h
300m3/h
400m3/h
500m3/h
800m3/h
1000m3/h
1500m3/h
2000m3/h
1 Indoor and Outdoor Unit Capacities
1.1 Indoor Units
1.1.1 Standard indoor units
Table 1-1.1: Standard indoor unit abbreviation codes
Table 1-1.2: Standard indoor unit capacity range
1.1.2 Fresh air processing unit
Table 1-1.3: Fresh air processing unit capacity range
1.2 Heat recovery ventilator
Table 1-1.4: Heat recovery ventilator capacity range
4
V6-i VRF 50/60Hz
Part 1 - General Information
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
1.3 Outdoor Units
Table 1-1.5: Outdoor unit capacity range
5
V6-i VRF 50/60Hz
Midea V6-i Series Engineering Data Book
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
Fresh Air Processing Unit
FA
Heat Recovery Ventilator
2 External Appearance
2.1 Indoor Units
2.1.1 Standard indoor units
Table 1-2.1: Standard indoor unit appearance
2.1.2 Fresh air processing unit
Table 1-2.2: Fresh air processing unit appearance
2.2 Heat Recovery Ventilator
Table 1-2.3: Heat recovery ventilator appearance
6
V6-i VRF 50/60Hz
Part 1
- General Information
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)
2.3 Outdoor Units
Table 1-2.4: Outdoor unit appearance
7
V6-i VRF 50/60Hz
Midea V6-i Series Engineering Data Book
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
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
3 Combination Ratio
Table 1-5.1: Indoor and outdoor unit combination ratio limitations
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
8
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
Part 2
Component Layout and
Refrigerant Circuits
1 Layout of Functional Components ....................................................... 10
2 Piping Diagrams .................................................................................. 16
3 Refrigerant Flow Diagrams .................................................................. 22
9
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
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
3
4 2
1
1 Layout of Functional Components
8/10/12HP
Figure 2-1.1: 8/10/12 layout of functional components
10
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
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
4
2
1
14/16/18HP
Figure 2-1.2: 14/16/18 layout of functional components
11
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
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
4
2
1
20/22HP
Figure 2-1.3: 20/22 layout of functional components
12
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
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
5
4
6
7
8
9
12
13
11
9
10
3
2
1
24HP
Figure 2-1.4: 24 layout of functional components
13
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
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
4
6
7
8
9
12
13
14
11
9
10
3
2
1
26/28HP
Figure 2-1.5: 26/28 layout of functional components
14
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
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
4
6
7
8
9
12
13
14
11
9
10
3
2
1
30/32HP
Figure 2-1.6: 30/32 layout of functional components
15
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
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
1
15 12
9
3
2
4
5
6
11
10
14
8
8
13
EXVA
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
SV6
2 Piping Diagrams
8/10/12HP
Figure 2-2.1: 8/10/12HP piping diagram
16
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
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
1
15
12
9
3
4
5
6
11
10
7
14
8
8
13
EXVA
EXVC
E
S
C
SV8A
SV4
SV7
SV5
SV6
T3
T4
T6B
T6A
2
T7C1
T7C2
14/16/18HP
Figure 2-2.2: 14/16/18HP piping diagram
17
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
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
1
15
12
9
3
4
5
6
11
11
10 10
8
13
EXVA
E
S
C
SV9
SV4
SV5
SV6
SV2
T3
T4
2
T7C1
T7C2
2
20/22/24HP
Figure 2-2.3: 20/22/24HP piping diagram
18
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
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
1
15
15
12
9
3
4
5
6
11
10
11
10
14
8
8
SV6
13
EXVA
EXVC
S
E
C
SV8A
SV8B
SV4
SV9
SV5
T3
T4
T6B
T6A
T7C1
T7C2
2
2
26/28HP
Figure 2-2.4: 26/28HP piping diagram
19
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
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
SV7
Refrigerant bypass indoor units 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
1
15
15
12
9
3
4
5
6
11
10
11
10
14
8
8
13
EXVA
EXVC
E
S
C
SV6
SV5
SV9
S
V7
S
V4
SV8A
SV8B
T3
T4
T6B
T6A
T7C1
T7C2
2
2
30/32HP
Figure 2-2.5: 30/32HP piping diagram
20
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
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. Accumulator:
Stores liquid refrigerant and oil to protect compressor from liquid hammering.
3. Electronic expansion valve (EXV):
Controls refrigerant flow and reduces refrigerant pressure.
4. Four-way valve:
Controls refrigerant flow direction. Closed in cooling mode and open in heating mode. When closed, the heat
exchanger functions as a condenser; when open, the heat exchanger functions as an evaporator.
5. Solenoid valve SV4:
Returns oil to the compressor. Opens once the compressor has run for 200 seconds and closes 600 seconds later and
then opens for 3 minutes every 20 minutes.
6. Solenoid valve SV5:
Enables fast defrosting in heating mode and unloading in cooling mode. During defrosting operation, opens to
shorten the refrigerant flow cycle and quicken the defrosting process. In cooling mode, SV5 opens when outdoor
ambient temperature is above 40oC or compressor frequency is below 41Hz.
7. Solenoid valve SV6:
Allows refrigerant to bypass the expansion valves. Opens in cooling mode when discharge temperature exceeds the
limit. Closed in heating mode and standby.
8. Solenoid valve SV7:
Allows refrigerant to return directly to the compressor. Opens when indoor air temperature is close to the set
temperature to avoid frequent compressor on/off.
9. Solenoid valve SV8A / SV8B:
Allows refrigerant from plate heat exchanger inject directly to the compressor. SV8A opens when compressor A
startup and closes when compressor A stop. SV8B delays opening when compressor B startup and closes when
compressor B stop.
10. Solenoid valve SV9:
Balances compressor B pressure. Opens before compressor B startup and closed after compressor B running for 15
seconds. Opens after compressor B stops 10s and keep opening 60s.
11. High and low pressure switches:
Regulate system pressure. When system pressure rises above the upper limit or falls below the lower limit, the high or
low pressure switches turn off, stopping the compressor. After 10 minutes, the compressor restarts.
21
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
7
1
15
12
9
3
2
4
5
6
11
10
14
8
13
EXVA
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
SV6
Closed
Filter
Filter
Closed
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
Fan
on
Fan
off
Fan
on
Fan
on
7
1
15
12
9
3
2
4
5
6
11
10
14
8
13
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
EXVA
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
SV6
300 steps
Filter
Filter
300 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
3 Refrigerant Flow Diagrams
8/10/12HP
Cooling operation
Figure 2-3.1: 8/10/12HP refrigerant flow during cooling operation
Oil return operation in cooling mode
Figure 2-3.2: 8/10/12HP refrigerant flow during oil return operation in cooling mode
22
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
7
1
15
12
9
3
2
4
5
6
11
10
14
8
13
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
EXVA
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
SV6
480 steps
Filter
Filter
480 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
480 steps
Filter
Filter
480 steps
Filter
Filter
Fan
off
Fan
off
Fan
off
Fan
off
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
7
1
15
12
9
3
2
4
5
6
11
10
14
8
13
EXVA
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
SV6
Closed
Closed
Filter
Filter
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Normal control
Filter
Filter
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
Oil return operation in heating mode and defrosting operation
Figure 2-3.3: 8/10/12HP refrigerant flow during oil return operation in heating mode and during defrosting operation
Heating operation
Figure 2-3.4: 8/10/12HP refrigerant flow during heating operation
23
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
SV7
7
1
15
12
9
3
2
4
5
6
11
10
14
13
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
EXVA
8
SV6
Closed
Filter
Filter
Closed
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
SV7
EXVA
8
SV6
7
1
15
12
9
5
6
11
10
14
13
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
300 steps
Filter
Filter
300 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
14/16/18HP
Cooling operation
Figure 2-3.5: 14/16/18 refrigerant flow during cooling operation
Oil return operation in cooling mode
Figure 2-3.6: 14/16/18HP refrigerant flow during oil return operation in cooling mode
24
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
SV7
EXVA
8
SV6
7
1
15
12
9
3
2
4
5
6
11
10
14
13
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
480 steps
Filter
Filter
480 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
480 steps
Filter
Filter
480 steps
Filter
Filter
Fan
off
Fan
off
Fan
off
Fan
off
SV7
EXVA
8
SV6
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
7
1
15
12
9
3
2
4
5
6
11
10
14
13
EXVC
E
S
C
T3
T4
T6B
T7C1
T7C2
T6A
SV8A
SV4
SV5
Closed
Closed
Filter
Filter
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Normal control
Filter
Filter
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
Oil return operation in heating mode and defrosting operation
Figure 2-3.7: 14/16/18HP refrigerant flow during oil return operation in heating mode and during defrosting operation
Heating operation
Figure 2-3.8: 14/16/18HP refrigerant flow during heating operation
25
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
7
1
1
159
3
4
5
6
11
11
10 10
8
13
EXVA
E
S
C
T3
T4
2
T7C1
T7C2
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
Closed
Filter
Filter
Closed
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
12
SV2
300 steps
Filter
Filter
300 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
7
1
1
159
3
4
5
6
11
11
10 10
8
13
EXVA
E
S
C
T3
T4
2
T7C1
T7C2
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
12
SV2
20/22/24HP
Cooling operation
Figure 2-3.9: 20/22/24 refrigerant flow during cooling operation
Oil return operation in cooling mode
Figure 2-3.10: 20/22/24HP refrigerant flow during oil return operation in cooling mode
26
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
480 steps
Filter
Filter
480 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
480 steps
Filter
Filter
480 steps
Filter
Filter
Fan
off
Fan
off
Fan
off
Fan
off
7
1
1
159
3
4
5
6
11
11
10 10
8
13
EXVA
E
S
C
T3
T4
2
T7C1
T7C2
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
12
SV2
Closed
Closed
Filter
Filter
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Normal control
Filter
Filter
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
7
1
1
159
3
4
5
6
11
11
10 10
8
13
EXVA
E
S
C
T3
T4
2
T7C1
T7C2
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
12
SV2
Oil return operation in heating mode and defrosting operation
Figure 2-3.11: 20/22/24HP refrigerant flow during oil return operation in heating mode and during defrosting operation
Heating operation
Figure 2-3.12: 20/22/24HP refrigerant flow during heating operation
27
V6-i VRF 50/60Hz
Midea V6-i Series Service Manual
15
15
7
1
1
12
9
3
4
5
6
11
11
10 10
14
8
8
13
EXVA
EXVC
E
S
C
T3
T4
2
T7C1
T7C2
T6B
T6A
SV8A
SV8B
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
Closed
Filter
Filter
Closed
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
300 steps
Filter
Filter
300 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Filter
Filter
Normal control
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
15
15
7
1
1
12
9
3
4
5
6
11
11
10 10
14
8
8
13
EXVA
EXVC
E
S
C
T3
T4
2
T7C1
T7C2
T6B
T6A
SV8A
SV8B
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
26/28HP
Cooling operation
Figure 2-3.13: 26/28 refrigerant flow during cooling operation
Oil return operation in cooling mode
Figure 2-3.14: 26/28HP refrigerant flow during oil return operation in cooling mode
28
-i V6-i VRF 50/60Hz
Part 2
- Component Layout
and
Refrigerant Circuits
480 steps
Filter
Filter
480 steps
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
480 steps
Filter
Filter
480 steps
Filter
Filter
Fan
off
Fan
off
Fan
off
Fan
off
15
15
7
1
1
12
9
3
4
5
6
11
11
10 10
14
8
8
13
EXVA
EXVC
E
S
C
T3
T4
2
T7C1
T7C2
T6B
T6A
SV8A
SV8B
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
Closed
Closed
Filter
Filter
Unit on
Thermostat off
Unit on
Thermostat on
Unit on
Thermostat on
Unit off
Filter
Indoor unit operation
Filter
Normal control
Normal control
Filter
Filter
Filter
Filter
Fan
on
Fan
off
Fan
on
Fan
on
15
15
7
1
1
12
9
3
4
5
6
11
11
10 10
14
8
8
13
EXVA
EXVC
E
S
C
T3
T4
2
T7C1
T7C2
T6B
T6A
SV8A
SV8B
SV9
SV4
SV5
SV6
2
High temperature, high pressure gas
High temperature, high pressure liquid
Medium temperature, medium pressure gas
Low temperature, low pressure
Oil return operation in heating mode and defrosting operation
Figure 2-3.15: 26/28HP refrigerant flow during oil return operation in heating mode and during defrosting operation
Heating operation
Figure 2-3.16: 26/28HP refrigerant flow during heating operation
29
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