Specifications
TM002 Integrity 18 & 20L Service Instructions REV: E
D.O.I: 7/11/2007
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25
Diagnostic Test Points
Refer to wiring diagram, page 7, for connector and wiring positions.
Measuring Point
Test
Point
Connector
Wire Nº
& colour
Normal Condition Items Under Test
1 A R1 – R2 AC 85V – 120V Main Power
2 B W8 – W12 50 kilo-ohms – 500 kilo-ohms Overheat Limiter
DC 2V– 5V(Pulse) *1
BR9 – BL10
More than 1310 pulse/min
Water Flow Sensor pulse signal
3 B
R11 – BL10 DC 7V – 15V Water Flow Sensor
B4 – W6 DC 120V – 170V
R3 – B4 DC 11V – 19V
Fan Motor
DC 4V – 10V(Pulse) *1
4 K
Y1 – B4
More than 4800 pulse/min
Fan Motor is pulse signal
@ 20ºC – 10.3 kilo-ohms
5 B Y6 – BL7
@ 40ºC – 4.9 kilo-ohms
Water Inlet Thermistor
@ 20ºC – 10.3 kilo-ohms
6 B W5 – BL7
@ 40ºC – 4.9 kilo-ohms
Heat Exchanger Thermistor
@ 20ºC – 10.3 kilo-ohms
7 B R4 – BL7
@ 40ºC – 4.9 kilo-ohms
Hot Water Outlet Thermistor
@ 25ºC – 5.0 kilo-ohms
8 B B3 – BL7
@ 5ºC – 12.7 kilo-ohms
Ambient Air Thermistor
R1 – Earth AC 2V – 20V *2
9 J
W3 – Earth AC 2V – 20V *2
Flame Sensor detecting flame
DC 1.5V – 8.0V
10 B R1 – BL2
42 ohms – 97 ohms
Proportional Gas Flow Regulating
DC 70V – 110V
11 L Y9 – BL10
0.8 kilo-ohms – 2.2 kilo-ohms
Gas Inlet Solenoid Valve
12 L R2 – R8 AC 85V – 120V Igniter
DC 70V – 110V
13 L R3 – BL10
0.8 kilo-ohms – 2.2 kilo-ohms
Solenoid Valve 1
DC 70V – 110V
14 L W4 – BL10
0.8 kilo-ohms – 2.2 kilo-ohms
Solenoid Valve 2
R1 – Earth AC 2V – 20V *2
16 J
W3 - Earth AC 2V – 20V *2
Flame Sensor not detecting flame.
W2 – BL8 DC 8V – 16V
R7 – BL8 DC 8V – 16V
Less than DC 1V (Limiter off)
18 H
GR6 – BL8
DC 4V – 6V (Limiter on)
Water Volume Control Motor
position switch
19 L O6 – O12
DC 70 – 110V
0.6 kilo-ohms – 2.8 kilo-ohms
Water Bypass Solenoid (models
with -B suffix in model number only
e.g. 871020NF-B)
NOTES:
*1: Approximate reading measured by digital multimeter on DC range.
*2: Approximate reading measured by digital multimeter on AC range.