SYSTEM OPERATION
19
Maintain 12" (18" for Canada)
minimum clearance above highest
anticipated snow level. Maximum of
24" above roof.
Combustion Air
Roof Boot/Flashing
(Field Supplied)
Support (Field Supplied)
45 Elbow
(Field Supplied)
Combustion Air
Vent
by extracting almost all of the heat from the products of
combustion and cooling them to the point where condensation
takes place. The condensate which is generated must be
piped to an appropriate drain location.
RGT TT T R TR T B T
T T T T R T JT BX
T
R T RK TR RG T JT BX T T
BK R T
R T T TRT
RT B RRT G R JR R T
T TR K
• • If the drain line is routed through an area which may
see temperatures near or below freezing, precautions
must be taken to prevent condensate from freezing
within the drain line.
• • If an air conditioning coil is installed with the furnace,
a common drain may be used. An open tee must
be installed in the drain line, near the cooling coil, to
relieve positive air pressure from the coil’s plenum.
This is necessary to prohibit any interference with the
function of the furnace’s drain trap.
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.
T
RT RB RT R QT G T T
G RR T B T T RTG T
T TR G R RTG
Inlet gas supply pressures must be maintained within the
operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must
Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c. Maximum: 13.0" w.c.
When this furnace is installed at high altitude, the appropriate
to the natural reduction in the density of both the gas fuel and
combustion air as altitude increases. The kit will provide the
range.
High altitude kits are purchased according to the installation
altitude and usage of either natural or propane gas. Refer
appropriate altitude ranges and corresponding manufacturer’s
high altitude (Natural, Propane gas, and/or Pressure Switch)
kits.
Do derate the furnace by adjusting the manifold pressure
The combination of the lower air density and a lower manifold
amount of air into the burner. This may cause incomplete
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, and information provided by the gas
regardless of the BTU/ft
3
content of the fuel used. Refer to the
altitude ranges and corresponding manufacturer’s pressure
switch kits.
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