Specifications

TM040 16, 18 & 20L Continuous Flow Gas Water Heater Service Instructions
D.O.I: 2/06/2009
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52
Anti-Frost Heaters
1. Remove the PCB Assembly. Refer to „PCB Assembly‟ procedure on page 48.
2. Disconnect connector plugs at the Anti-Frost Thermostat and Power Cord
Heat Exchanger and Hot Water Outlet Connection Heaters
3. Remove the two screws from the hot water Outlet Flange to release the hot water
outlet Anti-Frost Heater.
4. Unclip the 2 Anti-Frost Heaters from the Heat Exchanger (Note the positions of both).
5. Remove the Anti-Frost Heaters and wiring (Some wiring retainers will need to be
released to remove wiring).
6. Reassemble in reverse of above ensuring anti-frost heaters are fitted in correct
positions.
Water Body Assembly Heater
2. Remove the Water Body Assembly (item 24 on exploded view). Refer to „Water Body
Assembly procedure on page 50.
3. Remove the Anti-Frost Heater retaining clip.
4. Remove the Anti-Frost Heater and wiring (Some wiring retainers will need to be
released to remove wiring).
5. Reassemble in reverse order of above.
Heat Exchanger Removal
1. Remove the Upper Burner Assembly. Refer to „Upper Burner Assembly‟ procedure on
page 49.
2. Remove the two Flame Sensor leads (items 12 and 13) and Ignition Lead from the
rubber cable glands in the underside of the Heat Exchange Assembly.
3. Remove the two screws retaining the Power Filter (item 9) from the Fan Assembly and
reposition Power Filter clear of Fan Assembly.
4. Remove the screw from the Water Body Assembly Flange (item 26) and remove
Flange.
5. Carefully disengage the two pipes from the Water Body Assembly.
6. Remove the two screws from the hot water Outlet Flange retaining the hot water outlet
pipe and carefully disengage the pipe.
7. Disconnect the multi-pin wiring connector from the Heat Exchanger Thermistor.
8. Disconnect the anti-frost wiring loom connector at the Anti-Frost Thermostat (item 15)
and the hot water outlet Anti-Frost Heater (item 7). Remove Anti-Frost Heater from hot
the Outlet Connector.
9. Open the Over Heat Limiter to gain access to Heat Exchanger Assembly. Remove
wiring retainer that joins Anti-Frost Heater wiring to the Over Heat Limiter wiring.
10. Remove the four screws retaining the Heat Exchanger. One from each side of the Heat
Exchanger and two from the top of the water heater cabinet above the flue outlet.
11. Remove Heat Exchanger by gently lifting the assembly up and clear of the water heater
cabinet.
12. Disconnect the multi-pin wiring plug from the Fan Motor to completely free Heat
Exchanger Assembly from the water heater.