1 TB-22
The RHFE-556 (FAIII, FTRAIII, WTA) using propane gas is not recommended for installation above
2000 ft (610 m).
The RHFE-431 (FAIII, WTA) using natural gas or propane gas is not recommended for installation
above 5000 ft (1524 m).
Proper operation of the Rinnai RHFE-431 (FAIII, WTA) or RHFE-556 (FAIII, FTRAIII, WTA) at high
altitude may require changing the manifold pressure settings. Refer to Table 1 (RHFE-431, natural gas),
Table 2 (RHFE-431, propane gas), or Table 3 ( RHFE-556, natural gas). If the manifold pressures
required for the installation elevation are different than the factory setting then follow the procedure
below.
Changing Manifold Pressure Settings
1. Turn off the gas and the power supply.
2. Remove the screws that hold the front panel.
Pull the panel out at the bottom and lift up
over the clips that hold it at the top.
3. Remove two test point screws (1/8 NPT tap)
with 3/16 Allen wrench and attach the
manometer to both test ports. Both ports
must be used in order to measure the
differential pressure. Ensure that the
manometer is properly calibrated.
5. Turn on the gas and power supply to the
appliance.
6. Press the ON/OFF button to operate the
appliance.
7. With the appliance operating, press the SW5
switch once.
8. Press the SW4 switch to operate the
appliance in forced low fire mode.
9. Compare the pressure reading on the
manometer to the correct table for your unit
and gas type. If necessary adjust the low fire
pressure using the
▲
and
▼
buttons.
Test
points
SW3 SW4
SW5 Test
Switch
RHFE-431 (FAIII, WTA)
RHFE-556 (FAIII, FTRAIII, WTA)
Installation at High Altitude
TECHNICAL BULLETIN 22
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.
CAUTION
