431Fa/Wta, 556Fa/Wta - Rinnai RHFE-551FA Service Manual

Gas Pressure Setting Procedure
1. There are two test points, one on the manifold and
one on the gas control assembly. Connect the pres-
sure gauge to both test points. Using an electronic
manometer, connect the negative side to the manifold
test point.
2. Press the ON/OFF switch. After unit ignites, wait ap-
proximately one minute.
3. Press the (SW5) button to start the programming
mode.
4. Press the (SW4) button. Use the arrow buttons to set
the low pressure to the appropriate setting for your
model and gas type. The V button will decrease the
pressure each time the button is pushed. The W but-
ton increases the pressure each time it is pushed.
5. Press the (SW4) button to lock in the low pressure.
6. Press the (SW3) button. Use the arrow buttons to set
the high pressure to the appropriate setting for your
model and gas type. The ▼ button will decrease the
pressure each time the button is pushed. The ▲ but-
ton increases the pressure each time it is pushed.
7. Press the (SW3) button to lock in the high pressure.
8. Press the (SW5) button to exit the programming mode
and return the appliance to its normal operating mode.
9. Press the ON/OFF button to turn the appliance off.
10. Remove manometer and install the test point screws.
Operate the unit and
•check the normal operating sequence
•visually inspect the flame
•check for gas leaks at the test points
Normal Operating Sequence
When you press the ON/OFF button, the LED
display will illuminate, the combustion fan will
begin to run, and the spark will ignite the main
burner.
This heater has an automatic ignition system.
When the main burner has lit, the combustion
lamp will glow red, and the spark will stop.
Rinnai Direct Vent Service Manual
RHFE-431 Series, RHFE-556 Series
CAUTION
Do not touch any other areas on the PC board
besides the "SW" switches while power is
supplied to the appliance. Parts of the PC board
are supplied with 120 volts.
CAUTION
Do not touch the areas at or near the heat
exchanger or burner. These areas become very
hot and could cause burns.
Nozzle Manifold
Pressure
Point1
SW6
Adjustment screw
Gas Valve
Pressure
Point2
SW3
SW4
SW5
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