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A total of 17 failure input alarm switches, as well as 1 fault output alarm switch, are provided for
dual compressor system
S/N Input port Fault Description
1
2
3
4
5
6
7
8
9
10
11 OV-COMP1
12 OV-COMP2
13
14
15
16
17
18
19
20
21
PKGP-SVX03D-EN
Return water temperature sensing
TH1
line in short/open circuit
Outlet water temperature sensing
TH2
line in short/open circuit
Discharge temperature 1 in short/
TH3
open circuit
Defrost temperature sensing line
TH4
1 in short/open circuit
Defrost temperature sensing line
TH5
2 in short/open circuit
Discharge temperature short/open
TH6
circuit
Compressor 2 high voltage
OVHT/HP2
pressure alarming
FLOW
Inadequate water flow
OV-PUMP Water pump overloaded
OV-FAN
Fan overloaded
Compressor 1 overloaded /
Compressor 1 middlum-pressure
alarming
Compressor 2 overloaded /
Compressor 2 middlum-pressure
alarming
Compressor 1 high voltage
HP1
pressure alarming
Compressor 1 low voltage
LP1
pressure alarming
Compressor 2 low voltage
FREZ/LP2
pressure alarming
Refrigerating outlet water
/ / /
temperature is too low.
Discharge temperature 1 is too
TH3
high.
Discharge temperature 2 is too
TH6
high.
TH4
Coil 1 temperature is too high.
TH5
Coil 2 temperature is too high.
BPHE outlet water temperature is
TH2
too high.
Troubleshooting and Diagnostics
Central
Controller
Type Code
Troubleshooting
Code
84
A
SE
All peripherals are to be closed.
A
SL
85
All peripherals are to be closed.
A
Sd
82
All peripherals are to be closed.
A
S1
7F
All peripherals are to be closed.
81
A
S2
All peripherals are to be closed.
A
S3
83
All peripherals are to be closed.
E
H2
65
Only compressor 2 is to be shut down.
6D
D
FL
All peripherals are to be closed.
6A
B
OP
All peripherals are to be closed.
B
OF
6B
All peripherals are to be closed.
78
C
78
Only compressor 1 is to be shut down.
78
E
78
Only compressor 2 is to be shut down.
C
H1
64
Only compressor 1 is to be shut down.
C
L1
66
Only compressor 1 is to be shut down.
E
L2
67
Only compressor 2 is to be shut down.
The compressor is to be shut down, while
8D
D
E3
the auxiliary heater of water pump is to work.
94
D
94
Only compressor 1 is to be shut down.
D
94
94
Only compressor 2 is to be shut down.
C
98
98
Only compressor 1 is to be shut down.
C
98
98
Only compressor 2 is to be shut down.
C
90
90
All peripherals are to be closed.
35
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