Wire color
1
Overheat Prevention
Device (Thermal Fuse)
CN10
3
W - BK
1
CN10
2 or less
23
W - O
16
DC 1 - 16 V
23
W - G
18
DC 1 - 16 V
23
W - V
20
DC 1 - 16 V
23
W - BK
24
DC 1 - 16 V
6
Y - BL
17
DC 1V or less
When valve is fully open
23
W - O
25
DC 1 - 16 V
23
W - G
26
DC 1 - 16 V
23
W - V
27
DC 1 - 16 V
23
W - BK
28
DC 1 - 16 V
10
Y - BL
17
DC 1V or less
When valve is fully open
3
R - BL
17
DC 14 - 16 V
5
Y - BL
17
DC 0.5 - 15 V
over 408 pulses/min.
(over 6.8Hz)
Y (+)
BL (-)
5
Water Inlet
Thermistor
CN63
4
W - W
2
CN63
DC 1 - 4.5 V
32 - 212°F
0 - 100°C Note 1)
6
Water Outlet
Thermistor
CN63
1
W - W
2
CN63
DC 1 - 4.5 V
32 - 212°F
0 - 100°C Note 1)
7
Heat Exchanger
Thermistor
CN63
3
W - W
2
CN63
DC 1 - 4.5 V
32 - 212°F
0 - 100°C Note 1)
8
Exhaust Thermistor
CN63
7
W - W
2
CN63
Note 2)
Note 2)
1
BL -
Burnercase
GND
-
10 kHz - 100 kHz
1
BL -
Electrode
Flame
Rod
-
DC 0.45
μ
A or less
When no flame is detected
10
Fan Motor
CN27
4
BR - BL
2
CN27
DC 7 - 45 V
1
R - BL
2
DC 10 - 14 V
3
Y - BL
2
100 Hz - 400 Hz
4 pulse/revolution
12
Igniter
CN197
1
BK - BL
3
CN102
DC 14 - 16 V
When igniter is sparking
DC 14 - 16 V
When valve is open
19 - 31
Coil resistance
DC 14 - 16 V
When valve is open
36 - 58
Coil resistance
DC 14 - 16 V
When valve is open
36 - 58
Coil resistance
DC 0.3 - 15 V
50 - 80
Coil resistance
1
BL -
Burnercase
GND
-
10 kHz - 100 kHz
1
BL -
Electrode
Flame
Rod
-
DC 1
μ
A or more
At flame detection
DC 14 - 16 V
When valve is open
36 - 58
Coil resistance
DC 14 - 16 V
When valve is open
36 - 58
Coil resistance
20
High Limit Switch
CN10
3
W - W
12
CN10
1 or less
Contact resistance
21
Air Inlet Thermistor
CN63
5
W - W
2
CN63
DC 0.7 - 4.4 V
Note 3)
22
Water Level Electrode
CN38
31
W - BL
17
CN38
DC 14 - 16 V
-
Power Supply
(Power Circuit Board)
CN92
1
W - BK
3
CN92
AC 108 - 132 V
-
Power Supply
(Main Circuit Board)
C102
4
R - BL
3
C102
DC 14 - 16 V
-
Remote Controller
CN89
1
BL - BL
3
CN89
DC 14 - 16 V
2
6
6
6
Fan Motor
CN27
CN38
4
9
14
Ref.
No.
Part
CN & Pin No.
Circuit board Check points
CN & Pin No.
CN27
Water Flow Sensor
CN78
Flame Rod
CN38
Bypass Flow
Control Valve
Heat Exchanger Flow
Control Valve
CN38
CN38
Remarks
Normal value
13
Primary Gas
Solenoid Valve
CN10
5
W - BL
CN10
11
3
Gas Solenoid Valve - 1
16
Gas Proportioning Valve
15
Gas Solenoid Valve - 2
CN10
9
R - BL
CN101
CN101
7
CN10
8
GY - BL
CN10
BR - BL
CN10
BK - BL
CN10
6
6
6
19
Gas Solenoid Valve - 4
CN10
7
10
O - BL
CN10
17
Flame Rod
CN78
18
Gas Solenoid Valve - 3
CN10
Note 1)
・
Inlet / Outlet / Heat Exchanger Thermistor Temperature Characteristics
Temperature (°F)
32
50
68
86
104
122
140
158
176
Temperature (°C)
0
10
20
30
40
50
60
70
80
Resistance (k )
23.7
15.5
10.3
7.0
4.9
3.5
2.5
1.9
1.4
Note 2)
・
Exhaust Thermistor Temperature Characteristics
Temperature (°F)
-4
14
32
50
68
86
Temperature (°C)
-20
-10
0
10
20
30
Resistance (k )
487
296
162
98.3
61.4
39.5
Voltage (V)
4.6
4.3
3.9
3.4
2.8
2.3
Note 3)
・
Air Inlet Thermistor Temperature Characteristics
Temperature (°F)
-4
14
32
50
68
86
Temperature (°C)
-20
-10
0
10
20
30
Resistance (k )
106.5
59.6
34.4
20.6
12.6
8.0
The ON/OFF condition of water level electrode
can be checked using the maintenance
monitors.
When maintenance monitor number 19 reads
"000", the condition of the electrode is normal.
When this monitor reads "001", the condition of
the electrode is abnormal.
Note 4)
<EN19WI30LS, EP19WI30LS>
22
Note 4)
Circuit Board Checkpoints
CN38
CN38
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Ω
Summary of Contents for EN18WI30LS
Page 8: ...EN19WI30LS EP19WI30LS 8 ...