Rinnai Circ-Logic RU80e, Service Manual

Page: 39 / 60

Condensing Water Heater Service Manual 39
100000354
KA Series Component Replacement Instructions
RC98HPe
Heat Exchanger
27. Install heat exchanger assembly in case. Place
bottom in cabinet first. Attach with four screws. (two
at top back and two on bottom). Install
reinforcement bracket with two screws. Ensure the
frost sensing switch is installed.
Install water and drain lines
28. Install drain connecting pipe with new o
-
rings and
attach with new clips.
29. Attach connecting pipe to by
-
pass valve with one
screw and bracket. Attach other water line with one
screw and bracket.
30. Attach the hot water outlet line to the hot water
outlet fitting with one screw and bracket. Reconnect
condensate tube to upper heat exchanger.
Reconnect wire harness
31. Reconnect heat exchanger thermistor (upper left).
32. Reconnect anti frost connector at bottom of cabinet.
One blue and one green connector.
33. Reconnect thermal fuse harnesses (lower right).
Single white wire connectors and single red wire
connector.
Install burner and burner cover plate
34. Install burner assembly with two screws. Remove
combustion chamber packing on sight glass plate.
Install new packing, in kit, on sight glass plate.
Install combustion chamber sight glass plate with
eight screws.
Install gas manifold
35. Remove packing from gas control assembly.
Discard. Install new packing, in kit, on gas control
assembly.
36. Remove the packing for manifold. Install new
packing, in kit, on gas manifold.
37. Reconnect the four connectors at bottom of
manifold.
38. Attach the gas manifold with three machine screws
at the gas control assembly. Install seven screws on
gas manifold to heat exchanger. Attach wire
harness ties.
Reconnect flame rod connectors and electrode
39. Install two flame rod connectors. (marked)
40. Install ignitor bracket with one machine screw.
41. Attach ignitor high tension cord to the electrode.
42. Turn on water supply, power supply, and gas
supply. Check for gas and water leaks. Perform
operational checks.
43. Install the front panel using four screws.