Gas Pressure - Rheem GPH series Installation Instructions Manual

GAS PRESSURE

IMPORTANT: The maximum gas
supply pressure to the furnace should
be 10.5" w.c. for natural gas and 13"
w.c. for LP gas.
Natural gas supply pressure should
operate between 5" to 10.5" w.c. LP
gas supply pressure should be 11" to
13" w.c. This pressure must be
maintained with all other gas-fired
appliances in operation.
NOTE: Do not exceed a gas pressure
of 13" w.c.
WARNING
!
NEVER PURGE A GAS LINE INTO
THE COMBUSTION CHAMBER.
NEVER USE MATCHES, FLAME OR
ANY IGNITION SOURCE FOR
CHECKING LEAKAGE. FAILURE TO
FOLLOW THIS WARNING CAN
CAUSE AN EXPLOSION OR FIRE
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY OR
DEATH.
To check for gas leakage, use an
approved chloride-free soap and water
solution, an electronic combustible gas
detector, or other approved method.
Orifice size information is shown on the
table below:
U.S. 0-7,999 Ft. 8,000 Ft. & Above
Natural gas #42
LP gas #54
CANADA 0-1,999 Ft. 2,000 Ft. to 4,500 Ft.
Natural gas #42
LP gas #54
LP CONVERSION
NOTE: For installation, see specific LP
kit installation instructions.
The valve can be converted to use
liquefied petroleum (LP) gas by
replacing the pressure regulator spring
with the conversion kit spring. This LP
kit spring allows the regulator to
maintain the proper manifold pressure
for LP gas. The correct burner LP
orifices are included in the kit.
NOTE: Order the correct LP conversion
kit from the furnace manufacturer.
Furnace conversion to LP gas must be
performed by a qualified technician.
#42
#54
#43
#55
NOx MODELS
When converting furnaces equipped
with NOx inserts to LP gas, remove the
NOx insert assemblies. Steps for
removal are listed below:
1. Turn off all electrical power and the
gas supply to the furnace.
2. Remove the burner door from the
furnace.
3. Remove the igniter assembly –
handle with care.
4. Remove the two screws attaching
the NOx insert retainer brackets to
the center panel. Pull the retainer
rod.
5. Put the two screws back into the
holes in the center panel.
6. Re-install the igniter and burner
assemblies.
7. Replace burner door.
8. Turn on electrical power and gas
supply to the unit
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