Rinnai RHFE-551FA Service Manual page 107

Removal of "OF" on New PC Board Installation
1. Remove power and shut off gas to the appliance.
2. Disconnect both Pressure tubes from Pressure Switch (Black tube in front, Clear tube in
back).
3. With the unit is the "Off" position, press the SW1 "Test" switch until it beeps.
4. Select the gas type and altitude accordingly using the "UP" and "Down" buttons:
L1: Propane below 2000ft.
L2: Propane 2001-5200ft.
L3: Propane 5201-7700ft.
L4: Propane 7701-10200ft.
A1: Natural Gas below 2000ft.
A2: Natural Gas 2001-5200ft.
A3: Natural Gas 5201-7700ft.
A4: Natural Gas 7701-10200ft.
5. Press the SW1"Test" button to lock in the altitude/gas type. The LED will display "F1". If it
does not use the "up/down" arrows to obtain "F1".
6. Press the SW1 "Test" Button to lock the code into memory.
7. The LED will now display the temperature scale "F" or "C" use the "up/down" arrows to
scroll between the Fahrenheit and Celsius scale.
8. To lock in all code and remove the "OF" from the board you must press and hold the
"Economy" button for two seconds.
9. The LED will go blank, if the "OF" is displayed repeat steps 3-8.
10. Reinstall both pressure tubes add gas back to unit. The unit is now ready to set the high
and low fire pressures.
11. 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 "Test" button until "LF" is displayed. Verify that the gas pressure is equivalent
•
to your "PL" pressure. Press the "Economy" button to lock setting into memory. Your
display will flash "18".
Press the "Test "button until "HF" is 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".
12. You can now power the unit down replace test port screws and check normal operating
sequence.
Rinnai Direct Vent Service Manual
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107