Specifications

TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
29
Diagnostic Test Points
Refer to wiring diagram, page 5, for connector and wiring positions.
Test
Point
Measuring Point
Normal Condition
Items Under Test
Connector
Wire Nº
& colour
1
A
R1 – R2
AC 85V – 120V
Main Power
2
B
W8 – W12
50 kilo-ohms – 500 kilo-ohms
Overheat Limiter
3
B
BR9 – BL10
DC 2V– 5V(Pulse) *1
Water Flow Sensor pulse signal
More than 1310 pulse/min
R11 – BL10
DC 7V – 15V
Water Flow Sensor
4
K
B4 – W6
DC 120V – 170V
Fan Motor
R3 – B4
DC 11V – 19V
Y1 – B4
DC 4V – 10V(Pulse) *1
Fan Motor is pulse signal
More than 4800 pulse/min
5
B
Y6 – BL7
@ 20ºC – 10.3 kilo-ohms
Water Inlet Thermistor
@ 40ºC – 4.9 kilo-ohms
6
B
W5 – BL7
@ 20ºC – 10.3 kilo-ohms
Heat Exchanger Thermistor
@ 40ºC – 4.9 kilo-ohms
7
B
R4 – BL7
@ 20ºC – 10.3 kilo-ohms
Hot Water Outlet Thermistor
@ 40ºC – 4.9 kilo-ohms
8
B
B3 – BL7
@ 25ºC – 5.0 kilo-ohms
Ambient Air Thermistor
@ 5ºC – 12.7 kilo-ohms
9
J
R1 – Earth
AC 2V – 20V *2
Flame Sensor detecting flame
W3 – Earth
AC 2V – 20V *2
B2 - Earth
AC 2V – 20V *2
10
B
R1 – BL2
DC 1.5V – 8.0V
Proportional Gas Flow Regulating
42 ohms – 97 ohms
11
L
Y9 – BL10
DC 70V – 110V
Gas Inlet Solenoid Valve
0.8 kilo-ohms – 2.2 kilo-ohms
12
L
R2 – R8
AC 85V – 120V
Igniter
13
L
R3 – BL10
DC 70V – 110V
Solenoid Valve 1
0.8 kilo-ohms – 2.2 kilo-ohms
14
L
W4 – BL10
DC 70V – 110V
Solenoid Valve 2
0.8 kilo-ohms – 2.2 kilo-ohms
15
L
B5 – BL10
DC 70V – 110V
Solenoid Valve 3
0.8 kilo-ohms – 2.2 kilo-ohms
16
J
R1 – Earth
AC 2V – 20V *2
Flame Sensor not detecting flame.
W3 - Earth
AC 2V – 20V *2
17
J
B2 - Earth
AC 2V – 20V *2
18
H
W2 – BL8
DC 8V – 16V
Water Volume Control Motor
position switch
R7 – BL8
DC 8V – 16V
GR6 – BL8
Less than DC 1V (Limiter off)
DC 4V – 6V (Limiter on)
19
L
O6 – O12
DC 70 – 110V
0.6 kilo-ohms – 2.8 kilo-ohms
Water Bypass Solenoid (models
with -B or -C suffix in model number
only e.g. 871024-B)
NOTES:
*1: Approximate reading measured by digital multimeter on DC range.
*2: Approximate reading measured by digital multimeter on AC range.