Component Replacement Instructions; Heat Exchanger; Rc80Hpe - Rinnai REU-KA2530FFUD-US Service Manual

Heat Exchanger

These instructions are for replacing the lower (primary) heat exchanger or the upper (secondary) heat exchanger.
1. Turn off gas supply.
2. Turn off water supply. Drain all water from the
appliance.
3. Turn off 120V power supply.
4. Remove four screws securing the front panel.
Remove front panel.
Remove gas manifold
5. Disconnect high tension cord from electrode.
6. Disconnect flame rod wires. (yellow and red)
7. Remove the three machine screws where manifold
meets gas valve. Then remove six screws from
manifold.
8. Disconnect ignitor module harness, mounted on
manifold. (gray/gray)
9. Disconnect the two solenoid wire harnesses at
bottom of manifold. Remove manifold plate.
Flame Rod
Connectors
(Step 6)
Manifold
(Step 7)
Ignitor
(Step 5, 8)
Solenoid
connectors
(Step 9)
Drain pipe clip
(Step 17)
Water outlet
(Step 15)
Condensing Water Heater Service Manual

Component Replacement Instructions

10. Remove eight screws for the combustion chamber
sight glass plate. Remove plate.
11. Remove two screws attaching the burner to the heat
exchanger. Pull out the burner.
Remove fan
12. Disconnect fan harness.
13. Remove two screws from fan assembly.
14. Remove fan.
Disconnect water lines
15. Remove one screw from hot water line bracket.
Remove bracket by rotating and moving it up toward
the bend in the tube where the diameter is smaller.
16. Remove two screws and two brackets at by-pass
valve assembly.
17. Remove clips from drain connecting pipe. Remove
drain connecting pipe.
31

RC80HPe

Combustion
chamber
sight glass
plate
(Step 10)
Fan
(Steps 12-14)
Machine
screws
(Step 7)
By-pass
valve
(Step 16)
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