Rinnai RHFE-551FA Service Manual page 108

Removal of "OF" on New PC Board Installation
1. Once the new PCB is installed, add power to the unit an "OF" will show on the LED dis-
play.
2. Remove power and gas to the unit.
3. Set dipswitches to correct setting, use table below:
4. Once dip switches are set, add power and gas back to the unit.
5. Press the "Test" button and "Economy" should blink.
6. Press and hold the "Economy" button. The display should read "PF".
7. Press the "Set Times" button and the unit will fire.
8. Follow the Gas pressure setting procedure for the unit.
9. Set high and low fire pressures the unit will display a "73" instead of a "78". You have to
set the "LF" (low fan) and "HF" (high fan).
Press the LF button "LF" will be displayed. Verify that the gas pressure is equivalent to
•
your "PL" pressure. Press the "LF" button to lock setting into memory.
Press the HF button "HF" will be displayed. Verify that the gas pressure is equivalent to
•
your "PH" pressure. Press the "Economy" button to lock the setting into memory. Your
display will flash "78".
10. Power down the unit, remove manometer and replace test port screws. You can now verify
normal operating sequence.
108 Rinnai Direct Vent Service Manual
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