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VRF Series
Midea VRF Series
167 pages
Manual
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V6R VRF 50/60
Hz
113
Part
6
-
Diagnosis and T
r
oubleshooting
LA
:
PED softwa
re veri
ficatio
n fai
led
Replace the inverter module
Short circuit high pressure sensor
connection on the inverter module, the
error code “LA” disappeared
High pressure sensor has short-
circuited or failed, replace the
sensor
No
Yes
L
A
F
a
u
l
t
Disconnect the
power supply
Notes
1. The high pr
essure s
ensor connect
ion is port CN21 on
the inv
erter module.
LA Prot
ection
113
115
Table of Contents
Main Page
Contents
2
General Information
4
Indoor and Outdoor Unit Capacities
5
VRF Indoor Units
5
Standard Indoor Unit Abbreviation Codes
5
Indoor Unit Capacity Range
5
Fresh Air Processing Unit
6
Heat Recovery Ventilator
6
High Temperature Hydro Module
6
Outdoor Units
6
External Appearance
7
Indoor Unit Appearance
7
Fresh Air Processing Unit Appearance
7
Heat Recovery Ventilator Appearance
8
High Temperature Hydro Module Appearance
8
Single Units
9
Single Outdoor Unit Appearance
9
Combination Outdoor Unit Appearance
9
Mode Selection Box
10
MS Box Appearance
10
Outdoor Unit Combinations
11
Combination Ratio
12
Indoor and Outdoor Unit Combination Ratio Limitations
12
Combinations of Indoor and Outdoor Units
13
Component Layout and Refrigerant Circuits
14
Layout of Functional Components
15
8/10/12HP Top View
15
8/10/12HP Front View
15
14/16/18/20HP Top View
16
14/16/18/20HP Front View
16
Piping Diagrams
17
8HP/10HP/12HP Piping Diagram
17
14HP/16HP/18/20HP Piping Diagram
18
Key Components
19
Oil Separator
19
Gas-Liquid Separator
19
Electronic Expansion Valve
19
Refrigerant Flow Diagrams
20
Cooling Operation
20
Refrigerant Flow During Cooling Operation
20
Main Cooling Operation
21
Refrigerant Flow During Main Cooling Operation
21
Heating Operation
22
Refrigerant Flow During Heating Operation
22
Main Heating Operation
23
Refrigerant Flow During Main Heating Operation
23
Oil Return Operation in Cooling Mode
24
Refrigerant Flow During Oil Return Operation in Cooling Mode
24
Oil Return Operation in Heating Mode and Defrosting Operation
25
Control
26
Table of Contents
26
General Control Scheme Flowchart
27
Stop Operation
28
Component Control During Stop Operation
28
Standby Control
29
Startup Control
29
Crankcase Heater Control
29
Startup Sequence and Frequency Control in Combination Modules
29
Component Control During Startup in Cooling Only/Main Cooling Mode
30
Component Control During Startup in Heating Only / Main Heating Mode
31
Normal Operation Control
32
Outdoor Unit Component Control During Normal Operation
32
Indoor Unit Component Control During Normal Operation
32
MS04-12 Component Control During Normal Operation
33
MS01 Component Control During Normal Operation
33
Compressor Control
34
Simultaneous Cooling and Heating Operation
34
Rotation of Compressors
35
Compressor Priority and Rotation – Two Outdoor Units
35
Compressor Priority and Rotation – Three Outdoor Units
35
Heat Exchanger Control
35
Electronic Expansion Valve Control
36
EEVA Control
36
EEVC Control
36
Outdoor Fan Control
37
Outdoor Fan Speed Steps
37
Upper Limit Fan Step in Static Pressure Mode
37
Protection Control
38
High Pressure Protection Control
38
Low Pressure Protection Control
38
Low Pressure Protection Control in Cooling Operation
38
Discharge Temperature Protection Control
39
Low Pressure Protection Control in Heating Operation
39
Over-Current Protection Control
39
Current Limitation for Compressor Inverter Modules
39
Ambient Temperature out of Range Protection Control
40
Disable Cooling Control
40
Inverter Module Temperature Protection Control
40
Wet Compression Protection Control
41
High Pressure Ratio Protection Control
41
Special Control
42
Oil Return Operation
42
Cooling Only/Main Cooling Oil Return Control
42
Timing of Oil Return Operation
42
Heating Oil Return Control
43
Defrosting Operation
44
Reverse Cycle Defrosting Operation
44
Indoor Unit Component Control During Defrosting Operation
45
Rotating Defrosting Operation
45
Switching Action of Two-Module Parallel System Heat Exchanger
45
Switching Action of Three-Module Parallel System Heat Exchanger
46
Other Control
47
Overload Control
47
Pump-Down Control
47
Recover Refrigerant to Outdoor Unit
47
Recover Refrigerant to Indoor Units and MS Boxes
48
Recover Refrigerant to Indoor Units and MS Units
48
Vacuum Control
48
Auto Snow-Blowing Control
49
Auto Mode and Dual Set Points
49
Timing of Auto Snow-Blowing Operation
49
Low Noise Mode
51
8.6 Power Limitation Mode
51
Field Settings
52
Outdoor Unit Field Settings
53
PCB Switches and Switch Settings
53
Outdoor Unit Main PCB Switches
53
Modes Set on Main PCB
55
Night Silent Mode Setting
55
Silent Mode Setting
55
Mode Selection Box Field Settings
56
MS01 Switches Settings
56
MS01 PCB Switches
56
MS04-12 Switches Settings
57
MS04-12 PCB Switch Settings
57
Manually Address Setting
57
Electrical Components and Wiring Diagrams
58
Outdoor Unit Electric Control Box Layout
59
8-12HP Top Layer of Electric Control Box
59
8-12HP Bottom Layer of Electric Control Box
59
14-20HP Top Layer of Electric Control Box
60
14-20HP Bottom Layer of Electric Control Box
60
Outdoor Unit Main PCB
61
Ports
61
Main PCB Port
62
Components
63
Outdoor Unit Main PCB Components
63
Main Control Chip
63
Function of Buttons SW3 to SW6
63
Menu Mode
64
Menu Mode Selection Flowchart
64
Menu Mode Function
65
How to Exit Specified Menu Mode
66
Exit Specified Menu Mode Method
66
Digital Display Output
68
Digital Display Output in Different Operating States
68
Data Transfer Module
69
Data Transfer Module Layout
69
PCB Components
69
Data Transfer Module PCB Components
69
Sync Information from Main PCB Digital Display
70
Auto Snow-Blowing Setting
70
Data Acquisition
70
Fault Data Storage
70
Compressor Inverter Module
71
8-12HP Compressor Inverter Module Ports
71
14-20HP Compressor Inverter Module Ports
73
Fan Module
75
Fan Module Ports
75
Mode Selection Box Main PCB
76
MS01 Main PCB Ports
76
MS04-12 Main PCB Ports
77
Spot Check
78
MS04-12 Spot Check
78
Wiring Diagrams
79
‐7.1: V6R Outdoor Unit Wiring Diagram
79
MS01 Wiring Diagram
80
MS04/MS06 Wiring Diagram
81
MS08/MS10/MS12 Wiring Diagram
82
Diagnosis and Troubleshooting
84
Error Code Table
85
MS04-12 Error Code Table
87
MS01 Error Code Table
87
Troubleshooting for Outdoor Unit
88
E0: Communication Error between Outdoor Units
88
Trigger / Recover Condition
88
Possible Causes
88
E2: Communication Error between MS Box and Master Unit
90
E4: T3/T4 Temperature Sensor Error
92
E5: Abnormal Power Supply Voltage
93
E7: Discharge Temperature Sensor Error (T7C1)
95
E8: Outdoor Unit Address Error
96
E9: EEPROM Mismatch of Compressor
97
F1: DC Bus Voltage Error
98
Zf6: Electronic Expansion Valve Connection Error
101
H0: Communication Error between Main Board and Compressor Drive Board
103
H2, H3: Qty. of Outdoor Unit Decreases/ Increases Error
105
H4: Compressor Inverter Module Protection
107
Specific Error Codes for H4 Inverter Module Protection
107
8-12HP LED Indicators LED1 and LED2 on Inverter Module
108
14-18HP LED Indicators LED1 and LED2 on Inverter Module
108
L0: Inverter Module Protection
109
L1: DC Bus Low Voltage Protection
110
Inverter Module Terminals
110
L2: DC Bus High Voltage Protection
111
L5: Zero Speed Protection
112
L7: Phase Sequence Error
113
LA: PED Software Verification Failed
114
Compressor Replacement Procedure
115
Check Oil in Other Compressors in the System
115
Check Filters
115
Vacuum Drying and Refrigerant Charging
116
Inspecting Compressor Oil
116
Effects of Spoiled Compressor Oil
117
H7: Qty. of Indoor Units Mismatching
118
H8: High Pressure Sensor Error
120
Hb: Low Pressure Sensor Error
122
Yhd: Slave Unit Malfunction
124
P1: High Pressure Protection
125
P2, H5: Suction Pipe Low Pressure Protection
127
P31: Primary Current Protection
129
P32: Secondary Current Protection
131
P9, H9: Fan Module Protection
136
PL, C7: Inverter Module Temperature Protection
138
PP: Compressor Discharge Insufficient Superheat Protection
139
A0: Emergency Shutdown
141
A1W: Refrigerant Leakage Protection
143
CA1, CA2, CA3, CA4, CA5: Connection Combination Error
144
CB1, CB2, CB3, CB4: Overmatch Protection
145
U0: Force Cooling Operation Not Performed
146
U21, U22, U23: Ambient Temperature Is out Range of Test Operation
147
U31, U32, U33: Stop Valve Is Not Open
149
Troubleshooting for Mode Selection Box
151
E2: Communication Error between MS and Master Outdoor Unit
151
E3/E4: T1C1/T2C2 Temperature Sensor Error
153
E7: EEPROM Error
154
FE: MS Has no Address When First Powered on
155
LL: S1+S2 Dialing Setting Error (for MS04-12)
156
H0: Communication between Master and Slave Control Boards Failed
157
F6: Electronic Ball Valve Connection Failure
158
F7: Main Power off (for MS01)
160
F9: Overload Error (for MS01)
161
A1: Refrigerant Leakage Protection (for MS01)
162
Temperature Sensor Resistance Characteristics
163
Parameters of Excess and Insufficient Refrigerant System
166
Outdoor Unit Operating Parameters in Excess Refrigerant System
166
Outdoor Unit Operating Parameters in Insufficient Refrigerant System
166
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