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• Ensure upflow or horizontal furnaces are not installed
directly on carpeting, or any other combustible material.
The only combustible material allowed is wood.
• Exposure to contaminated combustion air will result
in safety and performance-related problems. Do
not install the furnace where the combustion air is
exposed to the following substances:
chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
deicing salts or chemicals
carbon tetrachloride
halogen type refrigerants
cleaning solutions (such as perchloroethylene)
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
• If the furnace is used in connection with a cooling
unit, install the furnace upstream or in parallel with the
cooling unit coil. Premature heat exchanger failure
will result if the cooling unit coil is placed ahead of the
furnace.
• For vertical applications, the minimum cooling coil
width shall not be less than furnace width minus 1".
Additionally, a coil installed above an upflow furnace
or under a counterflow furnace may be the same
width as the furnace or may be one size larger
than the furnace. Example: a "C" width coil may be
installed with a "B" width furnace.
• For upflow applications, the front of the coil and
furnace must face the same direction.
• If the furnace is installed in a residential garage,
position the furnace so that the burners and ignition
source are located not less than 18 inches (457 mm)
above the floor. Protect the furnace from physical
damage by vehicles.
• If the furnace is installed horizontally, the furnace
access doors must be vertical so that the burners fire
horizontally into the heat exchanger. Do not install the
unit with the access doors on the "up/top" or "down/
bottom" side of the furnace.
• Do not connect this furnace to a chimney flue that
serves a separate appliance designed to burn solid
fuel.
• Counterflow installation over a noncombustible floor.
Before setting the furnace over the plenum opening,
ensure the surface around the opening is smooth
and level. A tight seal should be made between the
furnace base and floor by using a silicon rubber
caulking compound or cement grout.
• Counterflow installation over a combustible floor.
If installation over a combustible floor becomes
necessary, use an accessory subbase (see
Specification Sheet applicable to your model for
details). A special accessory subbase must be used
for upright counterflow unit installations over any
combustible material including wood. Follow the
instructions with the subbase for proper installations.
• Do not install the furnace directly on carpeting, tile, or
other combustible material other than wood flooring.
(NOTE: The subbase will not be required if an air
conditioning coil is installed between the supply
air opening on the furnace and the floor. The air
conditioning coil must be downstream from the heat
exchanger of the furnace.
Vent Pipe Clearance to Combustibles-
6" using Single Wall Connector or 1"
using B-1 vent.
Top - 1"
• Adequate combustion/ventilation air must be supplied
to the closet.
• Furnace must be completely sealed to floor or
base. Combustion/ ventilation air supply pipes must
terminate 12" from top of closet and 12" from floor
of closet. DO NOT remove solid base plate for side
return.
• Return air ducts must be completely sealed to the
furnace and terminate outside the enclosure surfaces.
Clearances and Accessibility
Unobstructed front clearance of 24" for servicing is
recommended.
VENT
B1-VENT
SINGLE
1"
6"
Top clearance for horizontal configuration - 1"
6
Back - 0"
Front Clearance - 3"
Figure 1
SIDES
FRONT
BACK
1"
3"
0"
Side
Clearance - 1"
TOP
(PLENUM)
1"
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