9
WIRING DIAGRAM
ONLY FOR GK2620
GC-107 /108
(Incoming temp.)
(Outgoing temp.)
10
Gas type switch
Flame sensor
Earthing
(7A)
(3A)
Fuse
AC100V
Max. gas control volume
DC90V
DC15V
DC120
〜
160V
DC90V
DC90V
184
℃
Fuse for fan motor
Combustion fan
DC2.6
〜
9V
Ignitor
Min. gas control volume
Main gas valve
Gas valve 2
Gas valve 1
Gas proportional valve
8
7
1
2
3
4
5
Hi-temp fuse
4
3
2
1
4
3
2
1
Combustion indicator
Water volume proportional valve
Forced set temp switch
Temperature cutout
Temperature sensor
Temperature sensor
Water flow sensor
Power
source
AC240V
AC100V
Power input
Earthing
Auto Transformer
B
BL
G
GR
O
P
R
W
Y
: Black
: Blue
: Gray
: Green
: Orange
: Purple
: Red
: White
: Yellow
R
Y
B
BL
P
W
O
GR
G
W
B
R
B
B
GR
PCB
OFF ON
OFF ON
Thermostat for
freeze protection
heaters
Freeze protection
heaters
W
O
O
Y
BL
R
Y
W
W
BL
Y
Y
Y
Y
Y
BL