Gas Pressure Setting - Rinnai RHFE-308 FTR Installation And User Manual

GAS PRESSURE SETTING

The working gas pressure on the water heater is electronically controlled and factory set. Under normal
circumstances it does not require adjustment during installation. Perform this procedure only if the unit is not
operating correctly and all other possible causes for incorrect operation have been eliminated, or you have
converted the Gas Type.
Contact Rinnai UK before attempting to alter the gas pressure.
Turn the appliance to the OFF position.
1. There are two test points, one on the heat exchanger, one
on the gas manifold. Connect a differential pressure gauge
between both test points. (Connect one side of the gauge
to one point, the other side of the gauge to the other). If
you are using an electronic manometer, connect the -
side to the heat exchanger test point.
2. When the unit has completely stopped press and hold the
SW1 test switch at the top of the PCB until it beeps.
3. Select the correct gas type code on the LED display using
UP and DOWN arrow buttons. Current selected gas type
will be indicated.
L1: LPG gas, short flue
L2: LPG gas, extended flue over 2.0m
A1: Nat. Gas, short flue
A2: Nat. Gas, extended flue over 2.0m
4. After selecting the appropriate gas setting above, press the SW1
test button to record the gas type code into the memory. The
LED will then display the F1 for proper Flue Block Function. If it
is not, set the display to the F1 by using the UP and DOWN
arrows.
5. Press the SW1 test button to enter the proper Flue Block
Function into memory.
6. Next the Temperature Classification code will appear on the
LED display. Using the UP and DOWN arrows select Celsius.
7. Press the SW1 test button to enter your selection into the
memory.
THE LED DISPLAY TURNS BLANK AND THE UNIT RETURNS TO
THE NORMAL OFF MODE.
PROGRAM IN YOUR CORRECT LOW FIRE AND HIGH FIRE GAS
PRESSURE SETTINGS. FOLLOW PROCEDURE BELOW FOR
SETTING THE MANIFOLD DIFFERENTIAL GAS PRESSURE. DO
NOT ADJUST GAS PRESSURE ON THIS APPLIANCE USING THE APPLIANCE REGULATOR SCREW.
YOU ARE NOW READY TO
– 39 –
Manifold
Gas Valve
Test point B
Set Temp
RoomTemp
Adjusting screw
Test
point A
TEST SW(SW1)
Temp
Control