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V6 Series
Midea V6 Series User Manual
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V6
VRF 50
Hz
107
Part
6 - Diagnosis and T
roublesho
oting
Step 8
:
V
acuum drying a
nd re
friger
ant char
ging

Once
all
the
compr
essors
and
other
compo
nents
have
been
fully
c
onnected,
vacuum
dry
the
s
yst
em
and
r
echarg
e
ref
riger
ant. R
ef
er to t
he
V6
Engineering Dat
a Boo
k, Part
3.
Figure 6-
2.10
:
Inspecting compressor oi
l
This oil is black
- it has been
carboniz
ed
This oil is a lit
tle
yellow
, but is clear
and tr
ansparent and
the condition is
acceptable
Th
is
oil is stil
l
tr
ansparent but ther
e
are impu
rities which
may clog the filt
er
Cloudy or gr
ay
oil indicat
es
abnormal
sy
ste
m
oper
ation
This oil con
tains
particles of copper
107
109
Table of Contents
V6 Service Manual Front Cover
1
CONTENTS
2
Part 1 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 units
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
12
1 Layout of Functional Components
13
2 Piping Diagrams
17
3 Refrigerant Flow Diagrams
23
Part 3 Control
34
1 General Control Scheme Flowchart
35
2 Stop Operation
36
3 Standby Control
36
3.1 Crankcase Heater Control
36
4 Startup Control
37
4.1 Compressor Startup Delay Control
37
4.2 Startup Control for Cooling Operation
37
4.3 Startup Control for Heating Operation
38
5 Normal Operation Control
39
5.1 Component Control during Normal Operation
39
5.2 Compressor Output Control
41
5.3 Compressor Step Control
41
5.4 Operating Priority and Rotation of Compressors
41
5.5 Electronic Expansion Valve Control
42
5.6 Outdoor Fan Control
43
6 Protection Control
44
6.1 High Pressure Protection Control
44
6.2 Low Pressure Protection Control
44
6.3 Discharge Temperature Protection Control
44
6.4 Compressor and Inverter Module Protection Control
44
6.5 Disable Heating Control
45
7 Special Control
46
7.1 Outdoor Unit Duty Cycling
46
7.2 Oil Return Operation
46
7.3 Defrosting Operation
49
Part 4 Field Settings
50
1 Outdoor Unit Field Settings
51
1.1 PCB Switches and Switch Settings
51
1.2 Modes Set on Main PCB
53
1.2.1 Priority mode setting
53
1.2.2 Silent time setting
54
1.2.2.1 Night silent time setting
54
1.2.2.2 Silent mode setting
55
1.2.2.3 Maximum fan speed and capacity output control in different silent mode
55
Part 5 Electrical Components and Wiring Diagrams
56
1 Outdoor Unit Electric Control Box Layout
57
2 Outdoor Unit Main PCB
59
2.1 Ports
59
2.2 Components
61
2.2.1 Layout
61
2.2.2 Function of buttons SW3 to SW6
61
2.2.3 Menu mode
62
2.2.4 UP / DOWN system check button
64
2.2.5 Digital display output
65
3 Compressor Inverter Module
66
3.1.1 Layout
66
3.1.2 LED indicators LED1 and LED2
66
3.1.3 Dial switch S7 setting
66
4 Wiring Diagrams
67
Part 6 Diagnosis and Troubleshooting
70
1 Error Code Table
71
2 Troubleshooting
72
2.1 Warning
72
2.2 E0: Communication error between outdoor units
73
2.2.1 Digital display output
73
2.2.2 Description
73
2.2.3 Trigger / recover condition
73
2.2.4 Possible causes
73
2.2.5 Procedure
74
2.3 E1: Phase sequence error
75
2.3.1 Digital display output
75
2.3.2 Description
75
2.3.3 Trigger / recover condition
75
2.3.4 Possible causes
75
2.3.5 Procedure
76
2.4 E2: Communication error between indoor and master unit
77
2.4.1 Digital display output
77
2.4.2 Description
77
2.4.3 Trigger / recover condition
77
2.4.4 Possible causes
77
2.4.5 Procedure
78
2.5 E4: Temperature sensor (T3/T4) error
79
2.5.1 Digital display output
79
2.5.2 Description
79
2.5.3 Trigger / recover condition
79
2.5.4 Possible causes
79
2.5.5 Procedure
80
2.6 E5: Abnormal power supply voltage
81
2.6.1 Digital display output
81
2.6.2 Description
81
2.6.3 Trigger / recover condition
81
2.6.4 Possible causes
81
2.6.5 Procedure
82
2.7 E7: Temperature sensor (T7C1/2) error
83
2.7.1 Digital display output
83
2.7.2 Description
83
2.7.3 Trigger / recover condition
83
2.7.4 Possible causes
83
2.7.5 Procedure
84
2.8 E8: Outdoor unit address error
85
2.8.1 Digital display output
85
2.8.2 Description
85
2.8.3 Trigger / recover condition
85
2.8.4 Possible causes
85
2.8.5 Procedure
86
2.9 xE9: EEPROM mismatch
87
2.9.1 Digital display output
87
2.9.2 Description
87
2.9.3 Trigger / recover condition
87
2.9.4 Possible causes
87
2.9.5 Procedure
88
2.10 xF1: DC bus voltage error
89
2.10.1 Digital display output
89
2.10.2 Description
89
2.10.3 Trigger / recover condition
89
2.10.4 Possible causes
89
2.10.5 Procedure
90
2.11 F3, F5: Temperature sensor (T6B/T6A) error
91
2.11.1 Digital display output
91
2.11.2 Description
91
2.11.3 Trigger / recover condition
91
2.11.4 Possible causes
91
2.11.5 Procedure
92
2.12 F6: Electronic expansion valve connection error
93
2.12.1 Digital display output
93
2.12.2 Description
93
2.12.3 Trigger / recover condition
93
2.12.4 Possible causes
93
2.12.5 Procedure
94
2.13 xH0: Communication error
95
2.13.1 Digital display output
95
2.13.2 Description
95
2.13.3 Trigger / recover condition
95
2.13.4 Possible causes
95
2.13.5 Procedure
95
2.14 H2, H3: Slave units decreased/increased
97
2.14.1 Digital display output
97
2.14.2 Description
97
2.14.3 Trigger / recover condition
97
2.14.4 Possible causes
97
2.14.5 Procedure
98
2.15 xH4: Inverter module protection
99
2.15.1 Digital display output
99
2.15.2 Description
99
2.15.3 Trigger / recover condition
99
2.15.4 Possible causes
99
2.15.5 Specific error codes for xH4 inverter module protection
99
2.15.6 L0: Inverter module protection
101
2.15.7 L1: DC bus low voltage protection
102
2.15.8 L2: DC bus high voltage protection
103
2.15.9 L4: MCE error
104
2.15.10 L7: Phase sequence error
105
2.15.11 L8: Compressor frequency variation greater than 15Hz within one second protection
106
2.15.12 Compressor replacement procedure
107
2.16 H7: Unmatched total number of indoor units
110
2.16.1 Digital display output
110
2.16.2 Description
110
2.16.3 Trigger / recover condition
110
2.16.4 Possible causes
110
2.16.5 Procedure
111
2.17 H8: High pressure sensor error
112
2.17.1 Digital display output
112
2.17.2 Description
112
2.17.3 Trigger / recover condition
112
2.17.4 Possible causes
112
2.17.5 Procedure
113
2.18 yHd: Slave unit malfunction
114
2.18.1 Digital display output
114
2.18.2 Description
114
2.18.3 Trigger / recover condition
114
2.18.4 Possible causes
114
2.18.5 Procedure
115
2.19 P1: Discharge pipe high pressure protection
116
2.19.1 Digital display output
116
2.19.2 Description
116
2.19.3 Trigger / recover condition
116
2.19.4 Possible causes
116
2.19.5 Procedure
116
2.20 P2, H5: Suction pipe low pressure protection
118
2.20.1 Digital display output
118
2.20.2 Description
118
2.20.3 Trigger / recover condition
118
2.20.4 Possible causes
118
2.20.5 Procedure
119
2.21 xP3: Compressor current protection
120
2.21.1 Digital display output
120
2.21.2 Description
120
2.21.3 Trigger / recover condition
120
2.21.4 Possible causes
120
2.21.5 Procedure
120
2.22 P4, H6: Discharge temperature protection
122
2.22.1 Digital display output
122
2.22.2 Description
122
2.22.3 Trigger / recover condition
122
2.22.4 Possible causes
122
2.22.5 Procedure
122
2.23 P5: Outdoor heat exchanger temperature protection
124
2.23.1 Digital display output
124
2.23.2 Description
124
2.23.3 Trigger / recover condition
124
2.23.4 Possible causes
124
2.23.5 Procedure
125
2.24 P9, H9: Fan module protection
126
2.24.1 Digital display output
126
2.24.2 Description
126
2.24.3 Trigger / recover condition
126
2.24.4 Possible causes
126
2.24.5 Procedure
126
2.25 PL, C7: Inverter module temperature protection
128
2.25.1 Digital display output
128
2.25.2 Description
128
2.25.3 Trigger / recover condition
128
2.25.4 Possible causes
128
2.25.5 Procedure
129
2.26 PP: Compressor discharge insufficient superheat protection
130
2.26.1 Digital display output
130
2.26.2 Description
130
2.26.3 Trigger / recover condition
130
2.26.4 Possible causes
130
2.26.5 Procedure
131
3 Appendix to Part 6
132
3.1 Temperature Sensor Resistance Characteristics
132
3.2 Normal Operating Parameters of Refrigerant System
135
V6 Service Manual Back Cover
136
5
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Midea V6 Series Specifications
General
Brand
Midea
Model
V6 Series
Category
Air Conditioner
Language
English
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