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V6-i Series
Midea V6-i Series Service Manual
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V6
-i VRF 50/60Hz
98
Midea
V6
-i Series Service Manual
L2: DC bus hi
gh vol
tage pr
ot
ection
2.13.8
Note:
1.
The
normal
DC
voltag
e
between
terminals
P
and
N
on
invert
er
module
should
be
450
-650V
.
When
the
voltag
e
is
hi
gher
than
700V
,
L2
prot
ection will be appeared.
Figure 6-
2.
7: Inverter mo
dule terminals
L2
protecti
on
The pow
e
r
supp
l
y i
s a
bnormal
Che
ck
the
pow
e
r
suppl
y
e
qui
pme
n
t
The DC
bus vol
tage
(
P,
N)
i
s
abnormal
1
Re
pl
ace the
3
-p
hase
br
i
d
ge
recti
f
i
e
r
Re
pl
ace the
i
nv
e
rte
r
modul
e
No
No
Yes
Yes
98
100
Table of Contents
Contents
2
General Information
2
General Information
4
Fresh Air Processing Unit
5
Indoor and Outdoor Unit Capacities
5
Standard Indoor Unit Capacity Range
5
Standard Indoor Units
5
Outdoor Unit Capacity Range
6
External Appearance
7
Heat Recovery Ventilator
7
Standard Indoor Unit Appearance
7
Combination Ratio
9
Combinations of Indoor and Outdoor Units
9
Indoor and Outdoor Unit Combination Ratio Limitations
9
Component Layout and Refrigerant Circuits
10
8/10/12 Layout of Functional Components
11
Layout of Functional Components
11
14/16/18 Layout of Functional Components
12
20/22 Layout of Functional Components
13
26/28 Layout of Functional Components
15
30/32 Layout of Functional Components
16
8/10/12HP Piping Diagram
17
14/16/18HP Piping Diagram
18
20/22/24HP Piping Diagram
19
26/28HP Piping Diagram
20
30/32HP Piping Diagram
21
Key Components
22
Part 3 Control
22
8/10/12HP Refrigerant Flow During Cooling Operation
23
Cooling Operation
23
Oil Return Operation in Cooling Mode
23
Refrigerant Flow Diagrams
23
Heating Operation
24
Oil Return Operation in Heating Mode and Defrosting Operation
24
Table of Contents
34
Control
34
General Control Scheme Flowchart
35
Crankcase Heater Control
36
Crankcase Heater Controlled According to Outdoor Ambient Temperature
36
Startup Control
37
Standby Control
36
Stop Operation
36
Compressor Startup Delay Control
37
Startup Control for Cooling Operation
37
Component Control During Startup in Heating Mode
38
Startup Control for Heating Operation
38
Component Control During Normal Cooling Operation
39
Component Control During Normal Operation
39
Normal Operation Control
39
Component Control During Heating Operation
40
Compressor Output Control
41
Compressor Step Control
41
Operating Priority and Rotation of Compressors
41
Electronic Expansion Valve Control
42
Outdoor Fan Control
42
Outdoor Fan Speed Steps
42
Discharge Temperature Protection Control
44
High Pressure Protection Control
44
Low Pressure Protection Control
44
Protection Control
44
Compressor and Inverter Module Protection Control
45
Disable Heating Control
45
Oil Return Operation
46
Special Control
46
Timing of Oil Return Operation
46
Defrosting Operation
48
Indoor Unit Component Control During Defrosting Operation
48
Outdoor Unit Component Control During Defrosting Operation
48
Field Settings
50
Outdoor Unit Field Settings
51
PCB Switches and Switch Settings
51
Heating Priority Mode
53
Modes Set on Main PCB
53
Priority Mode Setting
53
Night Silent Time Setting
54
Silent Time Setting
54
Maximum Fan Speed and Capacity Output Control in Different Silent Mode
55
Silent Mode Setting
55
Electrical Components and Wiring Diagrams
56
8-18HP Bottom Layer of Electric Control Box
57
8-18HP Top Layer of Electric Control Box
57
Outdoor Unit Electric Control Box Layout
57
20-32HP Bottom Layer of Electric Control Box
58
20-32HP Top Layer of Electric Control Box
58
Outdoor Unit Main PCB
59
Outdoor Unit Main PCB Ports
59
Main PCB Ports
60
Function of Buttons SW3 to SW6
61
Layout
61
Outdoor Unit Main PCB Components
61
Menu Mode
62
Menu Mode Selection Flowchart
62
Menu Mode Function
63
How to Exit Specified Menu Mode
64
UP / down System Check Button
64
Digital Display Output
65
Compressor Inverter Module
66
Compressor Inverter Module Components
66
Dial Switch S7 Setting
66
Wiring Diagrams
67
LED Indicators LED1 and LED2
66
Part 6 Diagnosis and Troubleshooting
70
Error Code Table
71
Troubleshooting
72
E1: Phase Sequence Error
73
Trigger / Recover Condition
73
E2: Communication Error between Indoor and Outdoor Unit
75
E4: Temperature Sensor (T3/T4) Error
77
E5: Abnormal Power Supply Voltage
79
E7: Temperature Sensor (T7C1/2) Error
81
E8: Outdoor Unit Address Error
83
Xe9: EEPROM Mismatch
85
Xf1: DC Bus Voltage Error
87
F3, F5: Temperature Sensor (T6B/T6A) Error
89
F6: Electronic Expansion Valve Connection Error
91
Xh0: Communication Error
93
Xh4: Inverter Module Protection
95
LED Indicators LED1 and LED2 on Inverter Module
96
L0: Inverter Module Protection
97
L1: DC Bus Low Voltage Protection
98
L2: DC Bus High Voltage Protection
99
L4: MCE Error
100
L7: Phase Sequence Error
101
Check Oil in Other Compressors in the System
103
Compressor Replacement Procedure
103
Inspect Oil from Faulty Compressor
103
Replace Oil Separator(S) and Accumulator(S)
103
Inspecting Compressor Oil
104
Vacuum Drying and Refrigerant Charging
104
Effects of Spoiled Compressor Oil
105
Unmatched Total Number of Indoor Units
106
H8: High Pressure Sensor Error
108
P1: Discharge Pipe High Pressure Protection
110
P2, H5: Suction Pipe Low Pressure Protection
112
Combination Ratio
114
Xp3: Compressor Current Protection
114
P4, H6: Discharge Temperature Protection
116
P5: Outdoor Heat Exchanger Temperature Protection
118
P9, H9: Fan Module Protection
120
PL, C7: Inverter Module Temperature Protection
122
PP: Compressor Discharge Insufficient Superheat Protection
124
Temperature Sensor Resistance Characteristics
126
Normal Operating Parameters of Refrigerant System
129
Outdoor Unit Cooling Mode Operating Parameters
129
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Midea V6-i Series Specifications
General
Brand
Midea
Model
V6-i Series
Category
Air Conditioner
Language
English
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