Noritz NR501-OD Service Manual page 30

<NRC661 (-DV, -OD), NRC711 (-DV,-OD)>
Circuit Board Checkpoints
Ref.
Part
No.
Overheat Prevention
1
Device (Thermal Fuse)
2 Water Servo-Main
3 Water Flow Sensor
4 Thermistor-Cold Water
5 Thermistor-Hot Water
Thermistor-Heat Exchanger
6
Thermistor-Exhaust
7
<-DV Model Only>
8 Thermistor - Air
9 Flame Rod
10 Flame Rod
11 Fan Motor
12
Igniter
13
Primary Gas
Solenoid Valve
15 Gas Solenoid Valve - 1
16
Gas Solenoid Valve - 2
17 Gas Solenoid Valve - 3
Gas Proportioning Valve
18
High Limit Switch
20 Water Level Electrode
Power Supply
-
(Power Circuit Board)
Power Supply
-
(Power Circuit Board)
Display Window
-
- Remote Controller
Note 4) •Cold Water / Hot water / Heat Exchanger Thermistor Temperature Characteristics
Temperature (° F)
Temperature (° C)
Resistance (k Ω)
Note 5) •Thermistor - Exhaust Temperature Characteristics
Temperature (° F)
Temperature (° C)
Resistance (k Ω)
Voltage (V)
Note 6) •Thermistor - Air Temperature Characteristics
Temperature (° F)
Temperature (° C)
Resistance (k Ω)
Circuit board Check points
(Check the wiring diagram
behind the front cover)
CN & Pin No. No.
CN10 15 BL - W
1 W - O
1 W - G
CN59 1 W - V
1 W - BK
Y - BL
2
CN104 4 R - BL
10 R - BL
CN63
9 Y - BL
CN63 4 W - BK
CN63 1 W - BK
3
CN63 W - BK
CN63 6 BK - BK
CN63 5 BK - BK
BL -
1
Burnercase
CN78
BL -
1
Electrode
BL -
1
Burnercase
CN78
BL -
1
Electrode
CN27 4 BR - BL
1 R - BL
CN27
3 Y - BL
CN42 6 BK - BL/W
CN10 10 W - BL
CN10 8 BK - BL
CN10 7 GY- BL
CN10 6 O - BL
CN10 4 R - BL
CN10 13 W - W
CN63 W - BK
CN92 3 W - BK
CN102 2 R - BL/W
CN142 R - BL
Note 8)
BL - BL
Terminal
CN89A
-Terminal
32 50 68 86 104
0 10 20 30 40
23.7 15.5 10.3 7.0 4.9
-4 14 32 50 68
-20 -10 0 10 20
487 296 162 98.3 61.4
4.6 4.3 3.9 3.4 2.8
-4 14 32 50 68
-20 -10 0 10 20
106.5 59.6 34.4 20.6 12.6
Normal value
CN & Pin No.
CN10 13 2Ω or less
3 DC 1 - 16 V
4 DC 1 - 16 V
CN59
5 DC 1 - 16 V
6 DC 1 - 16 V
DC 1V or less
12
CN63
12 DC 14V - 16 V
12 DC 14V - 16 V
DC 0.5 - 15 V
CN63
over 408 pulses/min.
12
(over 6.8Hz)
CN63 2 DC 1 - 4.5 V
CN63 2 DC 1 - 4.5 V
CN63 2 DC 1 - 4.5 V
Note 5)
CN63 2
CN63 DC 0.7 - 4.4 V
10 kHz - 100 kHz
GND
-
Flame DC 0.45μA or less
Rod
10 kHz - 100 kHz
GND
-
Flame
DC 1μA or more
Rod
CN27 2 DC 7 - 45 V
2 DC 10 - 14 V
CN27
2 100 Hz - 400 Hz
CN102 3 DC 14 - 16 V
DC 1 - 16 V
CN10 11
20 - 35 Ω
DC 1 - 16 V
CN10 11
35 - 65 Ω
DC 1 - 16 V
CN10 11
35 - 65 Ω
DC 1 - 16 V
CN10 11
35 - 65 Ω
DC 0.3 - 15 V
CN10 3
50 - 80 Ω
CN10 5 1Ω or less
CN63 2 DC 4.5 - 4.9 V
CN92 4 AC 108 - 132 V
CN102 3 DC 14 - 16 V
CN142 2 DC 14 - 16 V
Note 8)
4 1Ω or less
CN89B - DC 14 - 16 V
122 140 158 176
50 60 70 80
3.5 2.5 1.9 1.4
Note 7) The ON/OFF condition of water level electrode
86
can be checked using the maintenance
30
monitors.
39.5
When maintenance monitor number 19 reads
"000", the condition of the electrode is normal.
2.3
When this monitor reads "001", the condition of
the electrode is abnormal.
Note 8) Between CN142 No.4 of both Main circuit board
86
and Display window circuit board
30
8.0
30
When valve is fully open
Y(+) BL(-)
32 - 212° F
Note 4)
0 -100° C
32 - 212° F
Note 4)
0 -100° C
32 - 212° F
Note 4)
0 -100° C
Note 5)
Note 6)
When no flame is detected
4 pulse/revolution
When igniter is sparking
When valve is open
Coil resistance
When valve is open
Coil resistance
When valve is open
Coil resistance
When valve is open
Coil resistance
Coil resistance
Contact resistance
Note 7)