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Flow
Chart
Component
No.
GEARED
①
MORTOR
REMOTE CONTROLS
②
WATER FLOW
③
SENSOR
FAN MOTOR
④
FLAME ROD
⑤
HOT WATER
⑥
THERMISTOR
AIR INTAKE
⑦
THERMISTOR
THERMAL
⑧
FUSE
IGNITOR
⑨
MAIN SOLENOID
⑩
VALVE
SOLENOID
⑪
VALVE 1
SOLENOID
⑫
VALVE 2
MODULATING
⑬
VALVE
ELECTRIC TRANSFORMER VOLTAGES AND RESISTANCES:
CONNECTOR
COLOUR
H
W-W
D
Or-Or
D
B-Br
D
Br-Y
DIAGNOSTIC POINTS
Determination (normal figure)
Measurement point
Upper : Voltage
CN
Wire Color
Lower : Resistance, Current
I
B-Br
AC200～AC240V
A
R-B
DC11～13V
1
10～30Ω
R-Bk
DC11～13V
Y-Bk
Below DC1V(limiter ON)
Below DC4～6V(limiter OFF)
Br-Bk
Below DC1V(limiter ON)
Below DC4～6V(limiter OFF)
E
Bk-W
DC11～13V
1
A
R-Bk
DC11～13V
2
Y-Bk
DC4～7V(pulse 17～400Hz)
B
R-Bk
DC6～40V
1
Y-Bk
DC11～13V
W-Bk
DC2～10V(pulse 20～400Hz)
C
Y-earth
More than DC1μA
2
A
W-W
15 ℃...11.4～14.0kΩ
4
30 ℃... 6.4～ 7.8kΩ
45 ℃... 3.6～ 4.5kΩ
60 ℃... 2.2～ 2.7kΩ
105℃... 0.6～ 0.8kΩ
A
Y/Bk-Y
15 ℃...20.1～17.9kΩ
3
30 ℃...10.2～ 8.9kΩ
45 ℃... 5.5～ 4.7kΩ
60 ℃... 3.1～ 2.6kΩ
105℃... 0.7～ 0.5kΩ
C
R-switch
Less than 1Ω
3
A
5
G
Gy-Gy
AC200～240V
1
F
P-Bk
DC200～240V
1
6.0～7.3KΩ
F
B-Bk
DC200～240V
2
7.3～8.9KΩ
F
Y-Bk
DC200～240V
3
7.3～8.9KΩ
C
P-P
DC2～15V
1
72～88Ω
NORMAL VALUE
AC200-240V 11-10Ω
AC49-55V 1.3-1.7Ω
AC12-14V 0.7-1.3Ω
AC195-216V 175-215Ω
47
Remark
AC power
Drive power
Control power
Full open limiter
Full close limiter
ON2.4L/min
(35Hz) over 2100 pulse/
min.
OFF1.7L/min
(24Hz) below 1440
pulse/min
More than 1200 pulse/
min
At ignition
Measure Thermistor
side (small wire)
Measure Thermistor
side (small wire)
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