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17 fault input alarm switches, 1 fault output alarm switch and 1 operating status output switch are arranged for the
double-compressor system.
No.
Input Port
Short circuit / open circuit of water inlet
1
TH1
2
TH2
Short circuit / open circuit of suction
3
TH3
Short circuit / open circuit of defrosting
4
TH4
Short circuit / open circuit of defrosting
5
TH5
Short circuit / open circuit of suction
6
TH6
7
OVHT/HP2
High pressure alarm of compressor 2
8
FLOW
9
OV-PUMP
10
OV-FAN
11
OV-COMP1
12
OV-COMP2
13
HP1
High pressure voltage of compressor 1
14
LP1
Low pressure voltage of compressor 1
15
FREZ/LP2
Low pressure voltage of compressor 2
16
/ / /
17
/ / /
Fault Description
temperature sensor
Short circuit / open circuit of water
outlet temperature sensor
temperature sensor 1
temperature sensing sensor 1
temperature sensing sensor 2
temperature sensor 2
Lack of water flow
Overload of water pump 1
Overload of fan
Overload of compressor 1
Overload of compressor 2
Low refrigeration water outlet
temperature
Low suction temperature
Type
Code
A
SE
A
SL
A
Sd
A
S1
A
S2
A
S3
Only switch off the compressor
E
H2
D
FL
B
OP
B
OF
Only switch off the compressor
C
C1
Only switch off the compressor
E
C2
Only switch off the compressor
C
H1
Only switch off the compressor
C
L1
Only switch off the compressor
E
L2
Switch off the compressor. The
D
E3
Switch off the compressor. The
D
E4
Troubleshooting
Fault Handling
Turn off all external devices
Turn off all external devices
Turn off all external devices
Turn off all external devices
Turn off all external devices
Turn off all external devices
2
Turn off all external devices
Turn off all external devices
Turn off all external devices
1
2
1
1
2
auxiliary heater for the water
pump operates.
auxiliary heater for the water
pump operates.
51
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