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”.
75
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.
6.
Outdoor Model:
Remove the three screws retaining the heat exchanger. Two from the
top of the heat exchanger to the side of the flue outlet and one from the bottom of
combustion chamber to the right of fan housing.
Indoor Model:
Remove the seventeen screws retaining the heat exchanger. Eight from
the outside of the heater cabinet around the flue outlet, six from the flue assembly, one
from each side of the flue terminal and one from the bottom of combustion chamber to
the right of fan housing.
7. Remove heat exchanger by gently lifting the assembly up and clear of heater cabinet.
8. 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.
11. Test for gas leaks using soapy water solution
12. Check for water leaks.
Heat Exchanger Replacement (Procedure 22)
1.
Isolate power and water supplies.
2. Remove heat exchanger. Refer procedure 21.
3. Remove the burner assembly, anti-frost heaters, fan assembly and cowling assembly
from the old heat exchanger and refit to the replacement heat exchanger.
4. Check the overheat limiter. Replace if damaged or open circuit.
5. Reassemble in reverse order of above.
6. Position the Overheat Limiter correctly as per step 6 of procedure 23 on page 76.
7. Test for gas leaks using soapy water solution
8. Check for water leaks.
