6. APPeNdIX
6.3 Connection of protection PCB illustration
CT
Current
Transformer
CT
Current
Transformer
CT
Current
Transformer
CT
Current
Transformer
WIRE NO.
WIRE COLOUR
5
6
7
8
9
10
11
12
13
14
15
16
17
12
7
8
10
13
11
6.4 Connection explanation
Wire No. Port No.
Symbol
Meaning
12,13
5,6
HIGH H2 GND
High pressure protection for system 2 (normal close)
14,15
7,8
LOW 2 GND
Low pressure protection for system 2 (normal close)
7,8
9,10
HIGH H2 GND
High pressure protection for system 1 (normal close)
10,11
11,12
LOW 1 GND
Low pressure protection for system 1 (normal close)
29,30,31
13,14,15
SYS GND 12V
Protection signal
SW
Current setting (handset)
12
CMP2
Exhausting temp. Of compressor 2
7
OUTW2
Refrigerant temp. After tube (system2) NC
8
INW2
Refrigerant temp. Before tube (system2) NC
13
CMP1
Exhausting temp. Of compressor 1
10
OUTW1
Refrigerant temp. After tube (system 1 (NC)
11
INW1
Refrigerant temp. Before tube (system 1) NC
