Rheem 871018 Service Instructions Manual page 55

Anti-Frost Heaters: (Procedure 10)
Note: Only models with an „F‟ in the model number are fitted with anti-frost heaters e.g.
871024NF.
1. Remove the front panel. Refer to Procedure 1.
Heat Exchanger and Hot Water Outlet Connection Heaters
1. Disconnect connector plugs at the sensing thermostat and at the power cord.
2. Remove Flange (item 445) to release the Hot Water Outlet Anti-frost Heater.
3. Unclip the 2 anti-frost heaters from the heat exchanger (Note the positions of both).
4. Remove the Anti-frost Heaters and wiring (Some wiring retainers will need to be
released to remove wiring).
5. Reassemble in reverse of above ensuring anti-frost heaters are fitted in correct
positions.
Water Body Assembly Heater
1. Disconnect connector plugs at the cord set and at the sensing thermostat.
2. Remove the Water Body Assembly (item 410). Refer to Procedure 7.
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/Replacement: (Procedure 11)
1. Follow the steps in Procedure 5, Upper Burner Assembly.
2. Remove the screw/s from the Water Body Assembly flange (item 419) and remove.
3. Carefully disengage the two pipes from the Water Body Assembly.
4. Remove the two screws from the hot water outlet flange (item 445) retaining the hot
water outlet pipe and carefully disengage the pipe.
5. Undo the 2 screws retaining the heat exchanger thermistor and remove the thermistor.
6. Disconnect the wiring loom connector at the thermostat (item 714) and the hot water
outlet heater (item 705).
7. Remove 5 screws retaining the heat exchanger assembly. One from each side of the
heat exchanger, two screws from the bracket above the flue outlet and one screw from
the fan case assembly (item 729).
8. Remove two screws retaining the bracket (above the flue terminal) and remove the
bracket. (Note: The bracket is glued in place; a small amount of force is required to
remove it).
9. Remove Heat Exchanger Assembly by gently moving the top forward out of the water
heater then lift the assembly up and clear.
10. Disconnect the multi-pin wiring plug from the Fan Motor to completely free Heat
Exchanger Assembly from water heater.
11. Remove the Anti-Frost Heaters (if fitted) and the Fan Motor and Cowling Assembly
from the old Heat Exchanger and refit to the replacement Heat Exchanger Assembly.
12. Replace the Over Heat Limiter if damaged or open circuit.
13. Reassemble in reverse order of above.
14. Test for gas leaks using soapy water solution
15. Check for water leaks.
16. Check and if necessary adjust MIN and MAX burner gas pressures. Refer to Procedure
on page 52.
TM031 Integrity 18, 20, 24, 26L Service Instructions REV: B
D.O.I: February 2008
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