1004Fa - Rinnai RHFE-551FA Service Manual

Gas Pressure Setting Procedure
Changing Manifold Pressure Settings
1. Turn off the gas and the power supply.
2. Remove the 2 screws that hold the front
panel. Pull the panel out at the top and
disconnect the LED wiring harness. Tilt the
top out and remove front cover.
3. Remove one test point screw (1/8 NPT tap)
with 3/16 Allen wrench and attach the
manometer to the test port. Ensure that the
manometer is properly calibrated.
4. Turn on the gas and power supply to the
appliance. With the unit in the Off position,
press the SW1 switch at the top of PC board
until it beeps.
5. Select the correct code on the LED display
using ▲ and ▼ buttons:
High altitude is above 2000 ft (610 m).
L1: Propane gas at low (sea level) altitude
L2: Propane gas unit at high altitude
A1: Natural gas at low (sea level) altitude
A2: Natural gas unit at high altitude
6. Press the SW1 test button to record the gas
type code into memory.
The LED display turns blank and the unit
returns to the normal off mode. You are
now ready to program in your correct low
fire and high fire gas pressure setting.
Follow the procedure below for setting the
manifold gas pressure. Do not adjust gas
pressure on this appliance using the
screw on top of the gas valve.
Table 1 Pressure Setting (W.C.)
using Natural Gas
Altitude High Fire
Less than 2000 3.70 in *
ft (610 m) (94 mm)
2000 - 10,200 ft 2.70 in
(610 - 3048 m) (69 mm)
* Factory Setting
Low Fire
2.0 in *
(51 mm)
2.0 in
(51 mm)
Rinnai Direct Vent Service Manual
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.
Table 2 Pressure Setting (W.C.)
using Propane Gas
Altitude
Less than 2000
ft (610 m)
2000 - 10,200 ft
(610 - 3048 m)
* Factory Setting
RHFE-1004FA
SW1 Test Switch
Test
point
High Fire Low Fire
10.1 in * 4.3 in *
(257 mm) (109 mm)
7.3 in 4.3 in
(185 mm) (109 mm)
97