55
TM061 Rheem 27 Water Star Service Instructions – Issued: 11/10
REV A Issued 08/13
This document is stored and maintained electronically by Service. All printed copies not bearing this statement in RED are deemed “uncontrolled”
Heat Exchanger Thermistor: (Procedure 19)
1. Isolate power and water supplies.
2. Relieve water pressure through a hot tap.
3. Remove front cover, control PCB and power supply PCB. Refer to procedures 1, 2 and 3.
4. Locate the heat exchanger thermistor at the top left hand side of heat exchanger.
5. Remove the stainless steel spring clip and withdraw the thermistor taking care not to
damage the o‟ring. Note: Water may escape during this procedure. Ensure o‟ring
remains located within thermistor housing.
6. Disconnect the heat exchanger thermistor lead from the yellow cable connector.
7. Reassemble in reverse order of above.
Anti-Frost Heaters: (Procedure 20)
1. Isolate power supply.
2. Remove front cover, control PCB and power supply PCB. Refer to procedures 1, 2 & 3.
3. Disconnect the red anti-frost wiring loom connector located to the right of the water
bypass control assembly.
4. Remove the two screws from the hot water outlet flange to release the hot water outlet
anti-frost heater.
5. Remove the screw from the cold water inlet connection to release the cold water inlet
anti-frost heater.
6. Unclip the two anti-frost heaters from the heat exchanger (Note the positions of both). It
may be necessary to remove the heat exchanger to refit the anti-frost heaters to the heat
exchanger (refer procedure 21).
7. Unclip the two anti-frost heaters from the copper pipes exiting the water bypass control
assembly.
8. Remove the anti-frost heater assembly from heater cabinet (Some wiring retainers will
need to be released to enable removal of wiring).
9. Reassemble in reverse order of above.
Heat Exchanger Removal (Procedure 21)
1. Isolate power and water supplies.
2. Remove the front cover, control PCB, power supply PCB, burner cover plate, gas
manifold assembly, ambient air thermistor, heat exchanger thermistor and anti-frost
heaters. Refer to procedures 1, 2, 3, 5, 6, 17, 19 and 20.
3. Remove the two flanges from the water bypass control assembly and carefully
disengage the two pipes from the water bypass control assembly.
4. Remove the two screws from the hot water outlet flange retaining the hot water outlet
pipe and carefully disengage the pipe.
5. Remove screw from the bottom left hand side of the fan housing.
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