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V4+R Series
Midea V4+R Series User Manual
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V4+R VRF 50/60Hz
20160
8
43
Part 5
- Diagnosis and T
r
oubleshooting
MDV-
400(14)
W/D2RN1T(C)
/
MD
V-450(16)
W/D2RN1T(
C)
Figure 5-1.3: Botto
m layer of electric con
trol box
Figure 5-1.4: T
op layer of electric control bo
x
T
able 5-1.1: MDV-400(14)W/D2RN1T(C) / MDV-450(16)W/D2RN1T(C)
Outdoor Unit Electric Contro
l Box Layout
No.
Cont
ent
1
Electric contr
o
l box ass
embly
2
Inv
erter module
3
Three-phase
bridge rectifier
4
T
empera
ture sensor
5
Outdoor power s
upply board
6
Outdoor curr
ent det
ection board
7
Outdoor power s
upply board
8
DC fan module
9
Int
ermediate
adapter board
10
Inv
erter module
11
Filter boar
d
12
Reactor
13
Powe
r supply te
rminals
14
Main PCB
15
T
rans
former
s
16
T
rans
former
s
17
Contact
or
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
44
46
Table of Contents
Cover 1
1
CONTENTS
3
Part 1 General Information
5
1 Indoor and Outdoor Unit Capacities
6
1.1 Indoor Units
6
1.2 Heat recovery ventilator
6
1.3 Outdoor Units
7
2 External Appearance
8
2.1 Indoor Units
8
2.2 Heat Recovery Ventilator
9
2.3 Outdoor Units
9
2.3.1 Single units
9
2.3.2 Combinations of units
9
2.4 MS boxes
10
3 Outdoor Unit Combinations
11
4 Combination Ratio
12
Part 2 Component Layout and Refrigerant Circuits
13
1 Layout of Functional Components
14
2 Piping Diagrams
16
3 Refrigerant Flow Diagrams
18
Part 3 Control
25
1 General Control Scheme Flowchart
26
2 Stop Operation
27
3 Standby Control
27
3.1 Crankcase Heater Control
27
4 Startup Control
28
4.1 Compressor Startup Delay Control
28
4.2 Startup Control for Cooling Operation
28
4.3 Startup Control for Heating Operation
28
5 Normal Operation Control
29
5.1 Component Control During Normal Operation
29
5.2 Compressor Output Control
29
5.3 Compressor Step Control
30
5.4 Operating Priority and Rotation of Compressors
30
5.5 Electronic Expansion Valve Control
32
5.6 Outdoor Fan Control
33
6 Protection Control
34
6.1 High Pressure Protection Control
34
6.2 Low Pressure Protection Control
34
6.3 Discharge Temperature Protection Control
34
6.4 Compressor and Inverter Module Protection Control
35
6.5 Disable Heating Control
35
7 Special Control
36
7.1 Outdoor Unit Duty Cycling
36
7.2 Oil Return Operation
36
7.3 Defrosting Operation
38
Part 4 Field Settings
39
1 Outdoor Unit Field Settings
40
1.1 PCB Switches and Switch Settings
40
1.2 Modes Set on Main PCB
42
1.2.1 Night silent time setting
42
Part 5 Diagnosis and Troubleshooting
43
1 Outdoor Unit Electric Control Box Layout
44
2 Outdoor Unit Main PCB
46
2.1 Ports
46
2.2 Components
48
2.2.1 Layout
48
2.2.2 Function of buttons SW1 to SW4
48
2.2.3 SW2 system check button
48
2.2.4 Digital display output
50
2.2.5 LED indicators LED1 to LED7
50
3 Error Code Table
50
4 Troubleshooting
52
4.1 Warning
52
4.2 E0 Troubleshooting
53
4.2.1 Digital display output
53
4.2.2 Description
53
4.2.3 Possible causes
53
4.2.4 Procedure
54
4.3 E1 Troubleshooting
55
4.3.1 Digital display output
55
4.3.2 Description
55
4.3.3 Possible causes
55
4.3.4 Procedure
56
4.4 E2 Troubleshooting
57
4.4.1 Digital display output
57
4.4.2 Description
57
4.4.3 Possible causes
57
4.4.4 Procedure
58
4.5 E4, E7 Troubleshooting
59
4.5.1 Digital display output
59
4.5.2 Description
59
4.5.3 Possible causes
59
4.5.4 Procedure
60
4.6 E5 Troubleshooting
61
4.6.1 Digital display output
61
4.6.2 Description
61
4.6.3 Possible causes
61
4.6.4 Procedure
62
4.7 E8 Troubleshooting
63
4.7.1 Digital display output
63
4.7.2 Description
63
4.7.3 Possible causes
63
4.7.4 Procedure
64
4.8 xE9 Troubleshooting
65
4.8.1 Digital display output
65
4.8.2 Description
65
4.8.3 Possible causes
65
4.8.4 Procedure
66
4.9 xH0, H1 Troubleshooting
67
4.9.1 Digital display output
67
4.9.2 Description
67
4.9.3 Possible causes
67
4.9.4 Procedure
68
4.10 H2, H3 Troubleshooting
69
4.10.1 Digital display output
69
4.10.2 Description
69
4.10.3 Possible causes
69
4.10.4 Procedure
70
4.11 H7 Troubleshooting
71
4.11.1 Digital display output
71
4.11.2 Description
71
4.11.3 Possible causes
71
4.11.4 Procedure
72
4.12 H8 Troubleshooting
73
4.12.1 Digital display output
73
4.12.2 Description
73
4.12.3 Possible causes
73
4.12.4 Procedure
74
4.13 yHd Troubleshooting
75
4.13.1 Digital display output
75
4.13.2 Description
75
4.13.3 Possible causes
75
4.13.4 Procedure
76
4.14 P0, P4, H6 Troubleshooting
77
4.14.1 Digital display output
77
4.14.2 Description
77
4.14.3 Possible causes
77
4.14.4 Procedure
77
4.15 P1 Troubleshooting
79
4.15.1 Digital display output
79
4.15.2 Description
79
4.15.3 Possible causes
79
4.15.4 Procedure
79
4.16 P2, H5 Troubleshooting
81
4.16.1 Digital display output
81
4.16.2 Description
81
4.16.3 Possible causes
81
4.16.4 Procedure
82
4.17 xP3 Troubleshooting
83
4.17.1 Digital display output
83
4.17.2 Description
83
4.17.3 Possible causes
83
4.17.4 Procedure
83
4.18 P5 Troubleshooting
85
4.18.1 Digital display output
85
4.18.2 Description
85
4.18.3 Possible causes
85
4.18.4 Procedure
86
4.19
86
4.19 xP6, xH4 Troubleshooting
87
4.19.1 Digital display output
87
4.19.2 Description
87
4.19.3 Possible causes
87
4.19.4 Specific error codes for xH4 inverter module protection
87
4.19.5 First troubleshooting step
89
4.19.6 xL0 troubleshooting
89
4.19.7 xL1/xL4 troubleshooting
90
4.19.8 xL2 troubleshooting
91
4.19.9 xL8/xL9 troubleshooting
91
4.19.10 Compressor replacement procedure
92
4.20 P9, H9 Troubleshooting
95
4.20.1 Digital display output
95
4.20.2 Description
95
4.20.3 Possible causes
95
4.20.4 Procedure
95
4.21 PL, C7 Troubleshooting
97
4.21.1 Digital display output
97
4.21.2 Description
97
4.21.3 Possible causes
97
4.21.4 Procedure
98
5 Appendix to Part 5
99
5.1 Temperature Sensor Resistance Characteristics
99
5.2 Normal Operating Parameters of Refrigerant System
102
Cover 2
104
5
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Midea V4+R Series Specifications
General
Brand
Midea
Model
V4+R Series
Category
Air Conditioner
Language
English
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