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45
DIAGNOSTIC POINTS
TRANSFORMER VOLTAGES AND RESISTANCES
Flow
Chart
No.
Component
Measurement point
Determination (normal figure)
Upper : Voltage
Lower : Resistance, Current
Remark
CN Wire Color
I B-Br
AC200㨪AC240V
AC power
Ԙ
GEARED
MORTOR
A
1
R-B
DC11㨪13V
10㨪30ǡ
Drive power
R-Bk
DC11㨪13V
Control power
Y-Bk Below DC1V(limiter ON)
Below DC4㨪6V(limiter OFF)
Full open limiter
Br-Bk Below DC1V(limiter ON)
Below DC4㨪6V(limiter OFF)
Full close limiter
ԙ
REMOTE CON
TROLS
E
1
Bk-W
DC11㨪13V
Ԛ
WATER FLOW
SENSOR
A
2
R-Bk
DC11㨪13V
ON2.4L/min
(35Hz) over 2100
pulse/min.
OFF1.7L/min
(24Hz) below 1440
pulse/min
Y-Bk
DC4㨪7V(pulse 17㨪400Hz)
ԛ
FAN MOTOR B
1
R-Bk
DC6㨪40V
More than 1200
pulse/min
Y-Bk
DC11㨪13V
W-Bk
DC2㨪10V(pulse 20㨪400Hz)
Ԝ
FLAME ROD C
2
Y-earth
More than DC1ǴA
At ignition
ԝ
HOT WATER
THERMISTOR
A
4
W-W
15 ̖͠11.4㨪14.0kǡ
30 ̖͠ 6.4㨪 7.8kǡ
45 ̖͠ 3.6㨪 4.5kǡ
60 ̖͠ 2.2㨪 2.7kǡ
105̖͠ 0.6㨪 0.8kǡ
Measure Thermis-
tor side (small wire)
Ԟ
AIR INTAKE
THERMISTOR
A
3
Y/Bk-Y
15 ̖͠20.1㨪17.9kǡ
30 ̖͠10.2㨪 8.9kǡ
45 ̖͠ 5.5㨪 4.7kǡ
60 ̖͠ 3.1㨪 2.6kǡ
105̖͠ 0.7㨪 0.5kǡ
Measure Thermis-
tor side (small wire)
ԟ
THERMAL
FUSE
C
3
A
5
R-switch
Less than 1ǡ
Ԡ
IGNITOR G
1
Gy-Gy
AC200㨪240V
ԡ
MAIN SOLE-
NOID VALVE
F
1
P-Bk
DC200㨪240V
6.0㨪7.8Kǡ
Ԣ
SOLENOID
VALVE 1
F
2
B-Bk
DC200㨪240V
7.8㨪10.8Kǡ
ԣ
SOLENOID
VALVE 2
F
3
Y-Bk
DC200㨪240V
7.8㨪10.8Kǡ
Ԥ
MODULATING
VALVE
C
1
P-P
DC2㨪15V
67㨪83ǡ
Connector Wire Color Normal Value
H
W-W
AC200㨪240V 11㨪20ǡ
DOr-Or
AC49㨪55V 1.3㨪1.7ǡ
D B-Br
AC12㨪14V 0.7㨪1.3ǡ
DBr-Y
AC195㨪216V 175㨪215ǡ