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If any bubbling is observed, the connection is not sealed
adequately and must be retightened. Repeat the tightening
and soap check process until bubbling ceases.
• If pressure testing the gas supply lines at pressures
greater than 1/2 psig (14 inches WC), the unit must
be disconnected from the gas supply piping system
to prevent damage to the gas valve.
• If the test pressure is less than or equal to 1/2 psig
(14 inches WC), the unit must be isolated from the
gas supply line by closing the manual shut-off valve.
High Altitude Conversion - Natural Gas
Conversion of this unit must be performed by qualified
service personnel, using only approved parts. All
installations must be made in accordance with the National
Fuel Gas Code and/or local jurisdiction codes.
WARNING:
The reduction of input rating necessary for high
altitude installation may only be accomplished
with factory supplied orifices. Do not attempt to
drill out orifices in the field. Improperly drilled
orifices may cause fire, explosion, carbon
monoxide poisoning, personal injury or death.
High altitude conversion can be field performed by a simple
adjustment of manifold pressure or a change of the orifices
(if necessary) as described in the Measuring & Adusting
the Manifold section (page 17). The changes required
depend on the installation altitude and the heating value
of the gas (based on sea level) which can be obtained
from your local gas utility. The heating value of gas at
high altitude is always lower than the sea level heating
value. Natural Gas heating values listed in Table 3 (page
14) are based on sea level values.
All factory shipped furnaces are ready to operate using
Natural Gas between zero and 2,000 ft. above sea level.
For altitudes between 2,000 and 10,000 feet above sea
level, the unit can be converted by adjusting the unit's
manifold pressure and/or changing the orifices. See Table
3 for the correct manifold pressure settings.
NOTE: If installing this unit above 2,000 feet, the input rate
must be reduced 4% per 1,000 feet of altitude (Example:
12% at 3,000 feet, 16% at 4,000 feet, etc). Deration is
necessary to compensate for low atmospheric pressure
at high altitudes.
LP / Propane Gas Conversion
WARNING:
This unit was equipped at the factory for use
with natural gas only. A special kit, supplied by
the manufacturer, is required to convert the unit
to operate on LP/propane gas. Failure to use the
proper conversion kit can cause fire, explosion,
property damage, carbon monoxide poisoning,
personal injury, or death.
Conversion of this equipment to LP/Propane gas must
be made by qualified service personnel, using approved
factory parts. Conversion to LP can be accomplished by
replacing the natural gas orifices with the appropriate LP/
Propane orifices and then adjusting the manifold pressure
(page 17). Conversion to LP/Propane (sea level and high
altitude) is detailed in the installation instructions provided
with the conversion kit. Please follow the instructions
provided in each kit. Approved conversion kits are
listed below:
• The United States LP/Propane Gas Sea Level and High
Altitude Conversion Kit (P/N 922311) is for LP/propane
conversion in the United States at altitudes between
zero and 10,000 ft. above sea level.
• The Canadian LP/Propane Gas Sea Level and High
Altitude Conversion Kit (P/N 922312)is for LP/propane
conversions in Canada at altitudes between zero and
4,500 ft. above sea level.
For installations between zero and 4,999 ft. above sea
level, a #55 drill size orifice should be used. Installations
5,000 ft. above sea level require a # 56 drill size orifice.
Table 4 (page 14) lists the correct orifice sizes and manifold
pressures for operation at different altitudes.
After changing the orifices, it is required that you measure
the gas input rate by clocking the gas meter and using
the local gas heating value. See Verifying the Firing Rate
of the Appliance section on page 16.
Automatic Gas Valve
(with manual shut-off)
Burner
Assembly
Manifold
Figure 5. Typical Gas Hookup - Right Side Entry
Shut-Off Valve
with 1 /8 NPT
plugged tap
Some utilities
require Shut-Off
Valve to be
4 to 5 feet
above floor
Ground
Dripleg
Joint
Union
13
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