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VC Pro MVC-224WV2WN1
Midea VC Pro MVC-224WV2WN1 - User Manual
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0WV2WN1
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Commer
cial Air Cond
itioner
s
R410A
Ser
vice
Manual
S
e
r
i
e
s
2
Table of Contents
Main Page
VC Pro Service Manual Front Cover
1
CONTENTS
2
Part 1 VC Pro General Information
4
1 Indoor and Outdoor Unit Capacities
5
1.1 Indoor Units
5
1.1.1 Standard indoor units
5
1.1.2 Fresh air processing unit
5
1.2 Heat recovery ventilator
5
1.3 Outdoor Units
6
2 External Appearance
7
2.1 Indoor Units
7
2.1.1 Standard indoor unit
7
2.1.2 Fresh air processing unit
7
2.2 Heat Recovery Ventilator
7
2.3 Outdoor Units
8
2.3.1 Single units
8
2.3.2 Combinations of units
8
3 Outdoor Unit Combinations
9
4 Combination Ratio
10
Part 2 Component Layout and Refrigerant Circuits
11
1 Layout of Functional Components
12
2 Piping Diagrams
15
3 Refrigerant Flow Diagrams
19
Part 3 Control
23
1 General Control Scheme Flowchart
24
2 Stop Operation
25
3 Startup Control
25
3.1 Compressor Startup Delay Control
25
3.2 Startup Control for Cooling Operation
25
4 Normal Operation Control
26
4.1 Component Control during Normal Operation
26
4.2 Compressor Output Control
26
4.3 Compressor Step Control
26
4.4 Operating Priority and Rotation of Compressors
26
4.5 Electronic Expansion Valve Control
27
4.6 Outdoor Fan Control
28
5 Protection Control
29
5.1 High Pressure Protection Control
29
5.2 Low Pressure Protection Control
29
5.3 Discharge Temperature Protection Control
29
5.4 Compressor and Inverter Module Protection Control
30
6 Special Control
31
6.1 Outdoor Unit Duty Cycling
31
6.2 Oil Return Operation
32
Part 4 Field Settings
33
1 Outdoor Unit Field Settings
34
1.1 PCB Switches and Switch Settings
34
1.2 Modes Set on Main PCB
36
1.2.1 Silent time setting
36
1.2.1.1 Night silent time setting
36
1.2.1.2 Silent mode setting
37
1.2.1.3 Maximum fan speed and capacity output control in different silent mode
37
Part 5 Electrical Components and Wiring Diagrams
39
1 Outdoor Unit Electric Control Box Layout
40
2 Outdoor Unit Main PCB
42
2.1 Ports
42
2.2 Components
44
2.2.1 Layout
44
2.2.2 Function of buttons SW3 to SW6
44
2.2.3 Menu mode
45
2.2.4 UP / DOWN system check button
47
2.2.5 Digital display output
48
3 Compressor Inverter Module
49
3.1 Ports
49
3.2 Layout
51
3.2.1 LED indicators LED1 and LED2
51
3.2.2 Dial switch S7 setting
51
4 Fan Module
52
4.1 Ports
52
5 Wiring Diagrams
53
Part 6 Diagnosis and Troubleshooting
55
1 Error Code Table
56
2 Troubleshooting
57
2.1 Warning
57
2.2 E0: Communication error between outdoor units
58
2.2.1 Digital display output
58
2.2.2 Description
58
2.2.3 Trigger / recover condition
58
2.2.4 Possible causes
58
2.2.5 Procedure
59
2.3 E1: Phase sequence error
60
2.3.1 Digital display output
60
2.3.2 Description
60
2.3.3 Trigger / recover condition
60
2.3.4 Possible causes
60
2.3.5 Procedure
61
2.4 E2: Communication error between indoor and master unit
62
2.4.1 Digital display output
62
2.4.2 Description
62
2.4.3 Trigger / recover condition
62
2.4.4 Possible causes
62
2.4.5 Procedure
63
2.5 E4: Temperature sensor (T3/T4) error
64
2.5.1 Digital display output
64
2.5.2 Description
64
2.5.3 Trigger / recover condition
64
2.5.4 Possible causes
64
2.5.5 Procedure
65
2.6 E5: Abnormal power supply voltage
66
2.6.1 Digital display output
66
2.6.2 Description
66
2.6.3 Trigger / recover condition
66
2.6.4 Possible causes
66
2.6.5 Procedure
67
2.7 E7: Temperature sensor (T7C1/2) error
68
2.7.1 Digital display output
68
2.7.2 Description
68
2.7.3 Trigger / recover condition
68
2.7.4 Possible causes
68
2.7.5 Procedure
69
2.8 E8: Outdoor unit address error
70
2.8.1 Digital display output
70
2.8.2 Description
70
2.8.3 Trigger / recover condition
70
2.8.4 Possible causes
70
2.8.5 Procedure
71
2.9 xE9: EEPROM mismatch
72
2.9.1 Digital display output
72
2.9.2 Description
72
2.9.3 Trigger / recover condition
72
2.9.4 Possible causes
72
2.9.5 Procedure
73
2.10 xF1: DC bus voltage error
74
2.10.1 Digital display output
74
2.10.2 Description
74
2.10.3 Trigger / recover condition
74
2.10.4 Possible causes
74
2.10.5 Procedure
74
2.11 F6: Electronic expansion valve connection error
75
2.11.1 Digital display output
75
2.11.2 Description
75
2.11.3 Trigger / recover condition
75
2.11.4 Possible causes
75
2.11.5 Procedure
76
2.12 xH0: Communication error
77
2.12.1 Digital display output
77
2.12.2 Description
77
2.12.3 Trigger / recover condition
77
2.12.4 Possible causes
77
2.12.5 Procedure
77
2.13 H2, H3: Slave units decreased/increased
79
2.13.1 Digital display output
79
2.13.2 Description
79
2.13.3 Trigger / recover condition
79
2.13.4 Possible causes
79
2.13.5 Procedure
80
2.14 xH4: Inverter module protection
81
2.14.1 Digital display output
81
2.14.2 Description
81
2.14.3 Trigger / recover condition
81
2.14.4 Possible causes
81
2.14.5 Specific error codes for xH4 inverter module protection
81
2.14.6 L0: Inverter module protection
83
2.14.7 L1: DC bus low voltage protection
84
2.14.8 L2: DC bus high voltage protection
85
2.14.9 L4: MCE error
86
2.14.10 L7: Phase sequence error
87
2.14.11 L8: Compressor frequency variation greater than 15Hz within one second protection
88
2.14.12 Compressor replacement procedure
89
2.15 H7: Unmatched total number of indoor units
90
2.15.1 Digital display output
90
2.15.2 Description
90
2.15.3 Trigger / recover condition
90
2.15.4 Possible causes
90
2.15.5 Procedure
91
2.16 H8: High pressure sensor error
92
2.16.1 Digital display output
92
2.16.2 Description
92
2.16.3 Trigger / recover condition
92
2.16.4 Possible causes
92
2.16.5 Procedure
93
2.17 yHd: Slave unit malfunction
94
2.17.1 Digital display output
94
2.17.2 Description
94
2.17.3 Trigger / recover condition
94
2.17.4 Possible causes
94
2.17.5 Procedure
95
2.18 P1: Discharge pipe high pressure protection
96
2.18.1 Digital display output
96
2.18.2 Description
96
2.18.3 Trigger / recover condition
96
2.18.4 Possible causes
96
2.18.5 Procedure
96
2.19 P2, H5: Suction pipe low pressure protection
98
2.19.1 Digital display output
98
2.19.2 Description
98
2.19.3 Trigger / recover condition
98
2.19.4 Possible causes
98
2.19.5 Procedure
99
2.1 xP3: Compressor current protection
100
2.1.1 Digital display output
100
2.1.2 Description
100
2.1.3 Trigger / recover condition
100
2.1.4 Possible causes
100
2.1.5 Procedure
100
2.2 P4, H6: Discharge temperature protection
102
2.2.1 Digital display output
102
2.2.2 Description
102
2.2.3 Trigger / recover condition
102
2.2.4 Possible causes
102
2.2.5 Procedure
102
2.3 P5: Outdoor heat exchanger temperature protection
104
2.3.1 Digital display output
104
2.3.2 Description
104
2.3.3 Trigger / recover condition
104
2.3.4 Possible causes
104
2.3.5 Procedure
105
2.4 xP9, xH9: Fan module protection
106
2.4.1 Digital display output
106
2.4.2 Description
106
2.4.3 Trigger / recover condition
106
2.4.4 Possible causes
106
2.4.5 Procedure
106
2.5 PL, C7: Inverter module temperature protection
108
2.5.1 Digital display output
108
2.5.2 Description
108
2.5.3 Trigger / recover condition
108
2.5.4 Possible causes
108
2.5.5 Procedure
109
2.6 PP: Compressor discharge insufficient superheat protection
110
2.6.1 Digital display output
110
2.6.2 Description
110
2.6.3 Trigger / recover condition
110
2.6.4 Possible causes
110
2.6.5 Procedure
111
3 Appendix to Part 6
112
3.1 Temperature Sensor Resistance Characteristics
112
3.2 Normal Operating Parameters of Refrigerant System
115
VC Pro Service Manual Back Cover
116
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Midea VC Pro MVC-224WV2WN1 Specifications
General
Brand
Midea
Model
VC Pro MVC-224WV2WN1
Category
Air Conditioner
Language
English
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