Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
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25
Diagnostic Test Points
Refer to wiring diagram on page 6 for connector and wiring positions.
Test
Point
Measuring Point
Normal Condition
Items Under Test
Connector
Wire Nº
& colour
1
H & I
R – R
AC 90V – 110V
Main Power
2
T
W1 – W2
50 kilo-ohms – 500 kilo-ohms
Overheat Limiter
3
R
BR1 – BK2
DC 2V– 5V(Pulse) *
Water Flow Sensor pulse signal
More than 1310 pulse/min
R3 – BK2
DC 11V – 17V
Water Flow Sensor
4
F
B4 – W6
DC 120V – 160V
Fan Motor
R3 – B4
DC 12V – 18V
Y1 – B4
DC 4V – 10V(Pulse) *
Fan Motor pulse signal
More than 4800 pulse/min
5
Q
W6 – BK3
@ 20ºC – 10.3 kilo-ohms
Water Inlet Thermistor
@ 40ºC – 4.9 kilo-ohms
6
Q
Y5 – BK3
@ 20ºC – 10.3 kilo-ohms
Heat Exchanger Thermistor
@ 40ºC – 4.9 kilo-ohms
7
Q
R4 – BK3
@ 20ºC – 10.3 kilo-ohms
Hot Water Outlet Thermistor
@ 40ºC – 4.9 kilo-ohms
8
L & J
W1 – Earth
AC 3V – 20V **
Flame Sensor not detecting flame
K & J
R1 – Earth
AC 3V – 20V **
9
Q
R1 – BK2
DC 1.5V – 14.0V
Proportional Gas Flow R. V
40 ohms – 80 ohms
10
J
Y1 – BK5
DC 75V – 100V
Gas Inlet Solenoid Valve
0.8 kilo-ohms – 2.2 kilo-ohms
11
G
GY2 – GY5
AC 90V – 110V
Igniter
12
J
W2 – BK5
DC 75V – 100V
Solenoid Valve 1
0.8 kilo-ohms – 2.2 kilo-ohms
13
J
R3 – BK5
DC 75V – 100V
Solenoid Valve 2
0.8 kilo-ohms – 2.2 kilo-ohms
14
L & J
W1 – Earth
AC 1V – 100V **
Flame Sensor detecting flame.
K & J
R1 – Earth
AC 1V – 100V **
15
B
W2 – BK8
DC 8V – 16V
Water Volume Control Motor position
switch
R7 – BK8
DC 8V – 16V
GR6 – BK8
Less than DC 1V (Limiter on)
DC 4V – 6V (Limiter off)
16
Q
B7 – BK3
@ 20ºC – 10.3 kilo-ohms
@ 40ºC – 4.9 kilo-ohms
Ambient Air Thermistor
NOTES:
* : Approximate reading measured by digital multimeter on DC range.
** : Approximate reading measured by digital multimeter on AC range.