Rinnai Circ-Logic RU80e, Service Manual

Page: 28 / 60

Condensing Water Heater Service Manual 28
100000354
KA Series Component Replacement Instructions
RC80HPe, RC80HPi,
RC98HPe, RC98HPi
Water Flow Control Assembly
1. Turn off gas supply.
2. Turn off water supply. Drain all water from
appliance.
3. Turn off 120v power supply.
4. Remove four screws securing the front panel.
Remove front panel.
Remove controller assembly (indoor models only)
5. Remove temperature controller. Remove two
screws for temperature controller bracket. Remove
bracket.
Remove water flow servo valve
6. Remove two screws and brackets at the bypass
valve. Remove two copper tubes.
7. Remove four screws attaching the water inlet to the
bottom of the water heater cabinet.
8. Disconnect the wire harnesses (water flow sensor
harness
-
black, yellow, red wires; bypass servo
assembly harness
-
white, red, yellow, orange,
brown wires, water flow servo valve harness
-
gray,
brown, orange, yellow, white, pink, blue, red).
Remove heating element.
9. Pull out the water flow servo assembly and bypass
servo assembly.
10. Remove two screws in order to separate the bypass
servo assembly from the water flow servo
assembly.
Reinstall water flow servo valve
11. Replace the O
-
ring (included in kit) between the
water flow servo assembly and the bypass servo
assembly. Attach the new water flow servo
assembly to the bypass assembly with two screws.
12. Place inside the heater and attach the wire
harnesses. Install heating element.
13. Replace the O
-
ring on the water inlet (included in
kit). Attach the water flow assembly to the water
inlet using four screws. The two shorter screws can
be installed first to connect the water flow assembly
to the bottom of the cabinet. Then install the two
longer screws through the water inlet.
14. Replace the O
-
ring on the water lines (included in
kit). Attach the two water lines to the bypass valve,
with one bracket and one screw for each line.
Install controller assembly (indoor models only)
15. Install temperature controller bracket with two
screws. Install temperature controller.
16. Turn on the water supply, power supply, and gas
supply.
17. Open hot water tap and ensure there are no leaks
at the water heater.
18. Install front panel using four screws.
Water flow servo
assembly connections