36
440 01 1051 02
Specifications are subject to change without notice.
Use elbows and 3
(76.2mm) pipe nipple to connect
valve to piping when using left side gas pipe entry.
*Union may be installed inside the cabinet when necessary
because of clearances.
Figure 38
Typical Gas Piping for Downflow
Drip Leg and Union, Union* should be outside the cabinet.
Manual shut
−
off valve MUST be upstream of dripleg, union,
and furnace.
Propane Low pressure
switch. Optional
Propane conversion.
Vent Pipe Grommet
(Single Pipe)
Manual shut-off
valve
Alternative
installation
Representative drawing only, some models may vary in appearance.
Additional Propane Connection Requirements
1. Have a licensed Propane gas dealer make all connections
at storage tank and check all connections from tank to
furnace.
2. If copper tubing is used, it
MUST
comply with limitation set in
National Fuel Gas Code or CGA codes.
3. Two
−
stage regulation of Propane gas is recommended.
Propane Conversion
An accessory kit shall be used to convert to propane gas use, see
the furnace rating plate for the Propane conversion accessory kit
part number.
FIRE, EXPLOSION, UNIT DAMAGE HAZARD
Failure to follow this warning could result in death,
property damage and/or personal injury.
A Propane conversion accessory kit is required
when operating the furnace with Propane gas.
!
WARNING
Supply Pressure
FIRE HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Do NOT set input rating above that shown on rating
plate.
!
WARNING
1. A
1
/
8
″
NPT plugged tapping, accessible for a test gauge
connection, must be installed immediately upstream of the
gas supply connection to the furnace.
2. Gas input to burners
MUST NOT
exceed the rated input
shown on rating plate.
3. Do
NOT
allow minimum gas supply pressure to vary
downward. Doing so will decrease input to furnace. Refer to
Table 6
and
Table 7
for normal gas supply and manifold
pressures.
Manifold Gas Pressure Adjustment
SEE CHECKS AND ADJUSTMENTS, Manifold Gas Pressure
Adjustment
in this manual.
