Midea MV5-X252W/V2GN1 User manual

Commercial Air Conditioners
R410A
MV5-X252W/V2GN1
MV5-X280W/V2GN1
MV5-X335W/V2GN1
MV5-X400W/V2GN1
MV5-X450W/V2GN1
MV5-X500W/V2GN1
MV5-X560W/V2GN1
MV5-X615W/V2GN1
Service
Manual

V5 X VRF 50/60Hz
201608 1
CONTENTS
CONTENTS
Part 1 General Information............................................................................ 3
Part 2 Component Layout and Refrigerant Circuits ................................... 11
Part 3 Control ............................................................................................... 21
Part 4 Field Settings..................................................................................... 35
Part 5 Diagnosis and Troubleshooting......................................................... 41

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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

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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
Q4-C
Compact Four-way Cassette
DL
Ceiling & Floor
Q4
Four-way Cassette
F
Floor Standing
T3
Low Static Pressure Duct
Z
Console
T2
Medium Static Pressure Duct
Table 1-1.2: Standard indoor unit capacity range
Capacity
Capacity
index
Q1
Q2
Q4-C
Q4
T3
T2
T1
G
DL
F
Z
kW
HP
1.8
0.6
18
18
—
—
—
18
—
—
—
—
18
—
2.2
0.8
22
22
22
22
—
22
22
—
22
—
22
22
2.8
1
28
28
28
28
28
28
28
—
28
—
28
28
3.6
1.25
36
36
36
36
36
36
36
—
36
36
36
36
4.5
1.6
45
45
45
45
45
45
45
—
45
45
45
45
5.6
2
56
56
56
—
56
56
56
—
56
56
56
—
7.1
2.5
71
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
Model
HRV-200
HRV-300
HRV-400
HRV-500
HRV-800
HRV-1000
HRV-1500
HRV-2000
Capacity (m3/h)
200
300
400
500
800
1000
1500
2000

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Part 1 - General Information
1.3 Outdoor Units
Table 1-1.5: Outdoor unit capacity range
Capacity
8HP
10HP
12HP
14HP
16HP
18HP
20HP
22HP
Model
(MV5-*/V2GN1)
X252W
X280W
X335W
X400W
X450W
X500W
X560W
X615W
Capacity
24HP
26HP
28HP
30HP
32HP
34HP
36HP
38HP
Model
(MV5-*/V2GN1)
X670W
X730W
X780W
X840W
X895W
X950W
X1000W
X1065W
Outdoor unit 1
12HP
10HP
10HP
10HP
10HP
12HP
18HP
16HP
Outdoor unit 2
12HP
16HP
18HP
20HP
22HP
22HP
18HP
22HP
Capacity
40HP
42HP
44HP
46HP
48HP
50HP
52HP
54HP
Model
(MV5-*/V2GN1)
X1115W
X1175W
X1230W
X1285W
X1345W
X1395W
X1455W
X1510W
Outdoor unit 1
18HP
20HP
22HP
12HP
10HP
10HP
10HP
10HP
Outdoor unit 2
22HP
22HP
22HP
12HP
16HP
18HP
20HP
22HP
Outdoor unit 3
—
—
—
22HP
22HP
22HP
22HP
22HP
Capacity
56HP
58HP
60HP
62HP
64HP
66HP
68HP
70HP
Model
(MV5-*/V2GN1)
X1565W
X1615W
X1680W
X1730W
X1790W
X1845W
X1900W
X1960W
Outdoor unit 1
12HP
18HP
16HP
18HP
20HP
22HP
12HP
10HP
Outdoor unit 2
22HP
18HP
22HP
22HP
22HP
22HP
12HP
16HP
Outdoor unit 3
22HP
22HP
22HP
22HP
22HP
22HP
22HP
22HP
Outdoor unit 4
—
—
—
—
—
—
22HP
22HP
Capacity
72HP
74HP
76HP
78HP
80HP
82HP
84HP
86HP
Model
(MV5-*/V2GN1)
X2010W
X2070W
X2125W
X2180W
X2230W
X2295W
X2345W
X2405W
Outdoor unit 1
10HP
10HP
10HP
12HP
18HP
16HP
18HP
20HP
Outdoor unit 2
18HP
20HP
22HP
22HP
18HP
22HP
22HP
22HP
Outdoor unit 3
22HP
22HP
22HP
22HP
22HP
22HP
22HP
22HP
Outdoor unit 4
22HP
22HP
22HP
22HP
22HP
22HP
22HP
22HP
Capacity
88HP
Notes:
1. The full model names can be obtained by substituting the asterisk in the model name format given in the
left-hand column of the table above with the shortened model names given in the table. For example, the
model name for the 40HP model is MV5-X1115W/V2GN1.
2. The combinations of units shown in the table are factory-recommended. Other combinations of units are
also possible.
Model
(MV5-*/V2GN1)
X2460W
Outdoor unit 1
22HP
Outdoor unit 2
22HP
Outdoor unit 3
22HP
Outdoor unit 4
22HP

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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
Q4-C
Q4
Low Static Pressure Duct
Medium Static Pressure Duct
T3
T2
High Static Pressure Duct
Wall-mounted
T1
G
Ceiling & Floor
Floor Standing
DL
F
Console
Z
2.1.2 Fresh air processing unit
Table 1-2.2: Fresh air processing unit appearance
Fresh Air Processing Unit

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

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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
20
22
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
2
●●
FQZHW-02N1D
73.0
26
2
●
●
78.0
28
2
●
●
84.0
30
2
●
●
89.5
32
2
●
●
95.0
34
2
●
●
100.0
36
2
●●
106.5
38
2
●
●
111.5
40
2
●
●
117.5
42
2
●
●
123.0
44
2
●●
128.5
46
3
●●
●
FQZHW-03N1D
134.5
48
3
●
●
●
139.5
50
3
●
●
●
145.5
52
3
●
●
●
151.0
54
3
●
●●
156.5
56
3
●
●●
161.5
58
3
●●
●
168.0
60
3
●
●●
173.0
62
3
●
●●
179.0
64
3
●
●●
184.5
66
3
●●●
190.0
68
4
●●
●●
FQZHW-04N1D
196.0
70
4
●
●
●●
201.0
72
4
●
●
●●
207.0
74
4
●
●
●●
212.5
76
4
●
●●●
218.0
78
4
●
●●●
223.0
80
4
●●
●●
229.5
82
4
●
●●●
234.5
84
4
●
●●●
240.5
86
4
●
●●●
246.0
88
4
●●●●
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
Minimum
combination ratio
Maximum combination ratio
Standard indoor
units only
Fresh air processing
units only
Fresh air processing units and
standard indoor units together
V5 X 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 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
78.0
28
780
390 to 1014
390 to 780
46
84.0
30
840
420 to 1092
420 to 840
50
89.5
32
895
447.5 to 1163.5
447.5 to 895
53
95.0
34
950
475 to 1235
475 to 950
56
100.0
36
1000
500 to 1300
500 to 1000
59
106.5
38
1065
532.5 to 1384.5
532.5 to 1065
63
111.5
40
1115
557.5 to 1449.5
557.5 to 1115
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
139.5
50
1395
697.5 to 1813.5
697.5 to 1395
145.5
52
1455
727.5 to 1891.5
727.5 to 1455
151.0
54
1510
755 to 1963
755 to 1510
156.5
56
1565
782.5 to 2034.5
782.5 to 1565
161.5
58
1615
807.5 to 2099.5
807.5 to 1615
168.0
60
1680
840 to 2184
840 to 1680
173.0
62
1730
865 to 2249
865 to 1730
179.0
64
1790
895 to 2327
895 to 1790
184.5
66
1845
922.5 to 2398.5
922.5 to 1845
190.0
68
1900
950 to 2470
950 to 1900
196.0
70
1960
980 to 2548
980 to 1960
201.0
72
2010
1005 to 2613
1005 to 2010
207.0
74
2070
1035 to 2691
1035 to 2070
212.5
76
2125
1062.5 to 2762.5
1062.5 to 2125
218.0
78
2180
1090 to 2834
1090 to 2180
223.0
80
2230
1115 to 2899
1115 to 2230
229.5
82
2295
1147.5 to 2983.5
1147.5 to 2295
234.5
84
2345
1172.5 to 3048.5
1172.5 to 2345
240.5
86
2405
1202.5 to 3126.5
1202.5 to 2405
246.0
88
2460
1230 to 3198
1230 to 2460
Combination ratio =
Sum of capacity indexes of the indoor units
Capacity index of the outdoor units

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Part 2 - Component Layout and Refrigerant Circuits
Part 2
Component Layout and
Refrigerant Circuits
1Layout of Functional Components ....................................................... 12
2Piping Diagrams .................................................................................. 14
3Refrigerant Flow Diagrams .................................................................. 16

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1Layout of Functional Components
MV5-X252W/V2GN1 / MV5-X280W/V2GN1 / MV5-X335W/V2GN1
Figure 2-2.1: MV5-X252(280, 335)W/V2GN1 top view
High pressure sensor
Discharge temperature switch
Compressor top
temperature sensor
Figure 2-2.2: MV5-X252(280, 335)W/V2GN1 front view
DC fan motor Solenoid valve SV5
(fast defrosting)
Solenoid valve SV4
(oil balance)
Solenoid valve SV2
(liquid refrigerant injection)
Low pressure switch
Discharge pipe
temperature sensor
DC inverter compressor
Unloading valve
Four-way valve
Solenoid valve SV6
(EXV bypass)
Heat exchanger
temperature sensor
High pressure switch
Crankcase heater
Outdoor ambient
temperature sensor
Electronic
expansion valve

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Part 2 - Component Layout and Refrigerant Circuits
MV5-X400W/V2GN1 / MV5-X450W/V2GN1 / MV5-X500W/V2GN1/ MV5-X560W/V2GN1 /
MV5-X615W/V2GN1
Figure 2-2.3: MV5-X400(450, 500, 560, 615)W/V2GN1 top view
Compressor top
temperature sensor
Compressor top
temperature sensor
Discharge temperature switch
Discharge temperature switch
Figure 2-2.4: MV5-X400(450, 500, 560, 615)W/V2GN1 front view
Solenoid valve SV5
(fast defrosting)
DC fan motor DC fan motor
Solenoid valve SV4
(oil balance)
Solenoid valve SV2
(liquid refrigerant injection)
Low pressure switch
Crankcase heater
DC inverter compressor
Crankcase heater
High pressure switch
DC inverter compressor
Heat exchanger
temperature sensor
Outdoor ambient
temperature sensor
Electronic
expansion valve
Solenoid valve SV6
(EXV bypass)
Four-way valve
High pressure sensor
Unloading valve
Electronic
expansion valve

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2Piping Diagrams
MV5-X252W/V2GN1 / MV5-X280W/V2GN1 / MV5-X335W/V2GN1
Figure 2-1.1: MV5-X252(280, 335)W/V2GN1 piping diagram
Filter
Four-way
valve
High pressure sensor
Pressure
regulating
valve
Compressor
Oil
Separator
Accumulator
Solenoid
valve SV2
Electronic expansion valve
High
pressure
switch
Heat exchanger 1-way valve
1-way valve
1-way valve
1-way
valve
Filter
Solenoid
valve SV4
Solenoid
valve SV6
Solenoid
valve SV5
Stop valve
Stop valve
Stop valve
Capillary
tube
Liquid pipe
Gas pipe
Oil balance pipe
MV5-X400W/V2GN1 / MV5-X450W/V2GN1 / MV5-X500W/V2GN1/ MV5-X560W/V2GN1 /
MV5-X615W/V2GN1
Figure 2-1.2: MV5-X400(450, 500, 560, 615)W/V2GN1 piping diagram
Solenoid
valve SV2
Heat exchanger
Four-way
valve
Low pressure
switch
High pressure
switch
Pressure
regulating
valve
Compressor
Compressor
Oil
Separator
Accumulator
Capillary
tube
High
pressure
sensor
1-way
valve
Filter Stop valve
Stop valve
Stop valve
1-way
valve
1-way
valve
Solenoid
valve SV5
Solenoid
valve SV6
Solenoid
valve SV4
Capillary
tube
Filter
Electronic
expansion valve
Electronic
expansion valve
Liquid pipe
Gas pipe
Oil balance pipe

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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 SV2:
Protects the compressor. If compressor discharge temperature rises above 100°C, SV2 opens and sprays a small
amount of liquid refrigerant to cool the compressor. SV2 closes again once the discharge temperature has fallen
below 90°C.
6. 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.
7. Solenoid valve SV5:
Enables fast defrosting. During defrosting operation, opens to shorten the refrigerant flow cycle and quicken the
defrosting process. Closed in cooling mode.
8. Solenoid valve SV6:
Allows refrigerant to bypass the expansion valves. Open in cooling mode when discharge temperature exceeds the
limit. Closed in heating mode or standby.
9. 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.

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3Refrigerant Flow Diagrams
MV5-X252W/V2GN1 / MV5-X280W/V2GN1 / MV5-X335W/V2GN1
Cooling operation
Figure 2-3.1: MV5-X252(280, 335)W/V2GN1 refrigerant flow during cooling operation
M
M
M
M
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
FAN
ON
FAN
ON
FAN
OFF
FAN
ON
Normal control
Filter
Filter
Normal control
Four-way
valve
High pressure sensor
Pressure
regulating
valve
Compressor
Oil
Separator
Accumulator
Solenoid
valve SV2
Electronic expansion valve
closed
High
pressure
switch
Heat exchanger
Heat exchanger
1-way valve
1-way valve
1-way valve
1-way
valve
Filter
Solenoid
valve SV4
Solenoid
valve SV6
Solenoid
valve SV5 Filter
Filter
Filter
Stop valve
Stop valve
Stop valve
Capillary
tube
"ON"
"ON"
"OFF"
"ON"
Indoor unit operation
closed
Oil return operation in cooling mode
Figure 2-3.2: MV5-X252(280, 335)W/V2GN1 refrigerant flow during oil return operation in cooling mode
M
M
M
M
1-way
valve
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
Heat exchanger
Heat exchanger
High pressure
sensor
Low pressure
switch
Compressor
Pressure
regulating
valve
Oil
Separator
Accumulator
Filter
Filter
Filter
Filter
FAN
ON
Normal control
Normal control
300 steps
Electronic expansion valve
Four-way
valve
Filter
High
pressure
switch
"ON"
"ON"
"OFF"
"ON"
Filter
Stop valve
Indoor unit operation
Filter
Capillary
tube
Stop valve
Stop valve
Solenoid
valve SV2
Solenoid
valve SV4
Solenoid
valve SV6
Solenoid
valve SV5
1-way
valve
1-way
valve
1-way valve
Filter
Filter
FAN
ON
FAN
OFF
FAN
ON
300 steps

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Part 2 - Component Layout and Refrigerant Circuits
Oil return operation in heating mode and defrosting operation
Figure 2-3.3: MV5-X252(280, 335)W/V2GN1 refrigerant flow during oil return operation in heating mode and during defrosting operation
M
M
M
M
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
FAN
OFF
Heat exchanger
FAN
OFF
FAN
OFF
FAN
OFF
Heat exchanger
High
pressure
switch
High pressure
sensor
Low pressure
switch
Compressor
Oil
Separator
Accumulator
Electronic expansion valve Filter
480 steps
Filter
"ON"
"ON"
"OFF"
"ON"
Filter
Stop valve
Indoor unit operation
Filter
Solenoid
valve SV4
Stop valve
Stop valve
Capillary
tube
Filter
Filter
Filter
Solenoid
valve SV2
1-way valve
Solenoid
valve SV5
480 steps
480 steps
480 steps
Filter
Filter
Heating operation
Figure 2-3.4: MV5-X252(280, 335)W/V2GN1 refrigerant flow during heating operation
M
M
M
M
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
FAN
ON
FAN
ON
FAN
OFF
FAN
ON
Filter
Normal control
Filter
Normal control
Four-way
valve
Low pressure
switch
High pressure
sensor
Pressure
regulating
valve
Compressor
Oil
Separator
Accumulator
Electronic expansion valve
High
pressure
switch
Heat exchanger
closed
Heat exchanger
Solenoid
valve SV2
Solenoid
valve SV4
Solenoid
valve SV6
Solenoid
valve SV5
Stop valve
Stop valve
Stop valve
1-way valve
1-way
valve
1-way
valve
Filter
Filter
Filter
Filter
"ON"
"ON"
"OFF"
"ON"
Indoor unit operation
Capillary
tube
Filter
Filter
closed

V5 X VRF 50/60Hz
18 201608
Midea V5 X Series Service Manual
MV5-X400W/V2GN1 / MV5-X450W/V2GN1 / MV5-X500W/V2GN1/ MV5-X560W/V2GN1 /
MV5-X615W/V2GN1
Cooling operation
Figure 2-3.5: MV5-X400(450, 500, 560, 615)W/V2GN1 refrigerant flow during cooling operation
Solenoid
valve SV2
M
M
M
M
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
FAN
ON
FAN
OFF
FAN
ON
Heat exchanger
Heat exchanger
FAN
ON
Filter
Normal control
Normal control
Four-way
valve
Low pressure
switch
High pressure
switch
Pressure
regulating
valve
Compressor
Compressor
Oil
Separator
Accumulator
Capillary
tube
closed
High
pressure
sensor
1-way
valve
Filter "ON"
"ON"
"OFF"
"ON"
Filter
Filter
Filter
Stop valve
Stop valve
Stop valve
1-way
valve
1-way
valve
Solenoid
valve SV5
Solenoid
valve SV6
Solenoid
valve SV4
Indoor unit operation
Capillary
tube
Filter
Electronic
expansion valve
Electronic
expansion valve
closed
Oil return operation in cooling mode
Figure 2-3.6: MV5-X400(450, 500, 560, 615)W/V2GN1 refrigerant flow during oil return operation in cooling mode
Four-way
valve
M
M
M
M
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
FAN
FAN
FAN
Heat exchanger
Heat exchanger
FAN
ON
ON
OFF
ON
Filter
Filter
300 steps
Normal control
Normal control
Low pressure
switch
High
pressure
sensor
High pressure switch Pressure
regulating
valve
Compressor
Compressor
Oil
Separator
Accumulator
Electronic
expansion valve
"ON"
"ON"
"OFF"
"ON"
Filter
Stop valve
Indoor unit operation
Filter
Capillary
tube
Stop valve
Stop valve
Filter
Solenoid
valve SV4
Solenoid
valve SV2
Solenoid
valve SV5 Filter
Filter
Filter
1-way
valve
Solenoid
valve SV6
Filter
Electronic
expansion valve
300 steps

V5 X VRF 50/60Hz
201608 19
Part 2 - Component Layout and Refrigerant Circuits
Oil return operation in heating mode and defrosting operation
Figure 2-3.7: MV5-X400(450, 500, 560, 615)W/V2GN1 refrigerant flow during oil return operation in heating mode and during defrosting
operation
M
M
M
M
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
FAN
OFF
FAN
OFF
FAN
OFF
Heat exchanger
Heat exchanger
FAN
OFF
Filter
Four-way
valve
Low pressure
switch
High pressure switch
High
pressure
sensor
Pressure
regulating
valve
Compressor
Compressor
Oil
Separator
Accumulator
Electronic
expansion valve
Filter
Filter "ON"
"ON"
"OFF"
"ON"
Stop valve
Indoor unit operation
Filter
Filter
Filter
Filter
Filter
Stop valve
Stop
valve
Solenoid
valve SV4
Solenoid
valve SV2
Solenoid
valve SV5
480 steps
Solenoid
valve SV6
1-way
valve
Capillary
tube
Filter
Electronic
expansion valve
480 steps
480 steps
480 steps
Heating operation
Figure 2-3.8: MV5-X400(450, 500, 560, 615)W/V2GN1 refrigerant flow during heating operation
M
M
M
M
High temperature, high pressure gas
High temperature, high pressure liquid
Low temperature, low pressure
FAN
ON
FAN
OFF
FAN
ON
1-way value
Heat exchanger
Heat exchanger
Filter
Normal control
Filter
Normal control
Four-way
valve
Low pressure
switch
High pressure
switch
Pressure
regulating
valve
Compressor
Electronic
expansion valve
High
pressure
sensor
closed
Compressor
Oil
Separator
Accumulator
FAN
ON
"ON"
"ON"
"OFF"
"ON"
Filter
Stop valve
Indoor unit operation
Stop valve
Stop valve
Filter
Filter
1-way
valve
Filter
Filter
Filter
1-way
valve
Solenoid
valve SV2
Solenoid
valve SV5
Solenoid
valve SV6
Solenoid
valve SV4
1-way
valve
Capillary
tube
Filter
Electronic
expansion valve
closed