TM049 27L Continuous Flow Service Instructions
REV AL
– Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support.
All printed copies are deemed “uncontrolled”.
74
Hot Water Outlet Thermistor: (Procedure 18)
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 hot water outlet thermistor at the hot water outlet connection on left hand side
of heater cabinet.
5. Remove the two thermistor retaining screws 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 hot outlet thermistor lead from the black cable connector.
7. Reassemble in reverse order of above.
Heat Exchanger Thermistor: (Procedure 19)
1.
Isolate power and water supplies.
2. Relieve water pressure through a hot tap.
3. Remove front cover, refer to procedure 1.
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.
8. Position the Overheat Limiter correctly as per step 6 of procedure 23 on page 76.
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.
10. Position the Overheat Limiter correctly as per step 6 of procedure 23 on page 76.
