Rheem 862 27 Series Service Instructions Manual page 77

Ignition Pack Replacement: (Procedure 24)
1. Isolate power supply.
2. Remove the front cover, burner cover plate, gas manifold assembly and burner
assembly. Refer to procedures 1, 5, 6 and 7.
3. Disconnect black high voltage lead from ignition electrode on right hand side of burner
assembly.
4. Replace ignition pack.
5. Reassemble in reverse order of above. NOTE: Ensure wiring to igniter and flame sensors
is not pinched during reassembly.
6. Position the Overheat Limiter correctly as per step 6 of procedure 23 on page 76.
Transformer: (Procedure 25)
1. Isolate power supply.
2. Remove the front cover, LED display, control PCB, power supply PCB and PGFR. Refer
to procedures 1, 2, 3, 4 and 10.
3. Disconnect primary transformer windings (blue & brown wires) from middle of power
supply PCB (Terminal C).
4. Disconnect the secondary windings from the top left hand side of power supply PCB
(Terminal E).
5. Remove the four screws retaining the transformer to the back of the water heater cabinet.
6. Lift the transformer out of heater cabinet.
7. Reassemble in reverse order of above.
Air Intake Hood: (Procedure 26)
1. Isolate power supply.
2. Remove the front cover, control PCB, power supply PCB, burner cover plate, gas
manifold assembly, PGFR, water bypass control, water volume control, ambient air
thermistor, heat exchanger thermistor, anti-frost heaters, heat exchanger and
transformer. Refer to procedures 1, 2, 3, 5, 6, 10, 12, 13, 17, 19, 20, 21 and 25.
3. Remove the nine screws from around the outside of the air intake hood.
4. Remove the air intake hood from heater cabinet.
5. Reassemble in reverse order of above.
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".
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