23
High altitude installations may require both a pressure
switch and an orice/spring change. These changes are
necessary to compensate for the natural reduction in the
density of both the gas fuel and the combustion air at
higher altitude.
For installations above 7000 feet, please refer to the
furnace Specication Sheets for required kit(s).
High altitude kits are purchased according to the
installation altitude and usage of either natural or propane
gas. The indicated kits must be used to insure safe
and proper furnace operation. All conversions must be
performed by a qualied installer, or service agency.
The high altitude,kit will provide the proper design certied
input rate within the specied altitude range.
Do derate the furnace by adjusting the manifold
pressure to a lower pressure than specied on the furnace
rating plate. The combination of the lower air density and a
lower manifold pressure will prohibit the burner orice from
drawing the proper amount of air into the burner. This may
cause incomplete combustion, ashback, and possible
yellow tipping.
In some areas the gas supplier may articially derate the
gas in an eort to compensate for the eects of altitude. If
the gas is articially derated, the appropriate orice size
must be determined based upon the BTU/ft
3
content of the
derated gas and the altitude. Refer to the National Fuel
Gas Code, NFPA 54/ANSI Z223.1 or CAN/CSA B149.1-15
in Canada, and information provided by the gas supplier to
determine the proper orice size.
WARNING
This unit is congured for natural gas. The appropriate
manufacturer’s propane gas conversion kit, must be
applied for propane gas installations. Refer to the
for details.
Consult the furnace Specication Sheet for a listing of
appropriate kits. The indicated kits must be used to insure
safe and proper furnace operation. All conversions must
be performed by a qualied installer, or service agency.
original bottom of the furnace.
16. Using the two sheet metal screws provided in the
cabinet, secure the trap to the furnace.
17. Refer to Field Supplied Drain section for instructions
on eld supplied / installed drain on outlet of furnace
trap.
CAUTION
Natural Gas Minim um : 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minim um : 11.0" w.c. Maximum: 13.0" w.c.
The furnace rating plate includes the approved furnace gas
input rating and gas types. The furnace must be equipped
to operate on the type of gas applied. This includes any
conversion kits required for alternate fuels and/or high
altitude.
Inlet gas supply pressures must be maintained within
the ranges specied in the following table. The supply
pressure must be constant and available with all other
household gas red appliances operating. The minimum
gas supply pressure must be maintained to prevent
unreliable ignition. The maximum must not be exceeded to
prevent unit overring.
#45 3.5" w.c. 1.9" w.c. None
LPM-08*
1
1.25mm 10.0" w.c. 6.0" w.c. None
1
LPM-08* supports both Honeywell and White-Rodgers 2-stage valves
In Canada, gas furnaces are only certified to 4500 feet.
This furnace is shipped from the factory congured for
natural gas at standard altitude. Propane gas installations
require an orice change to compensate for the energy
content dierence between natural and propane gas.
For furnaces being converted to LP gas, it is strongly
recommended that a LPLP03 kit also be installed. The
use of this kit will prevent the furnace from ring when
the LP gas supply pressure is too low to support proper
combustion.
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