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piping system from furnace to termination can be accomplished within the guidelines given. NOTE: The length of flue and/
or combustion air piping can be a limiting factor in the location of the furnace.
•
Locate the furnace so condensate flows downwards to the drain. Do not locate the furnace or its condensate drainage
system in any area subject to below freezing temperatures without proper freeze protection. Refer to Condensate Drain
Lines and Trap for further details.
•
Ensure adequate combustion air is available for the furnace. Improper or insufficient combustion air can expose building
occupants to gas combustion products that could include carbon monoxide. Refer to Combustion and Ventilation Air
Requirements.
•
Set the furnace on a level floor to enable proper condensate drainage. If the floor becomes wet or damp at times, place the
furnace above the floor on a concrete base sized approximately 1-1/2" larger than the base of the furnace. Refer to the
Horizontal Applications and Considerations for leveling of horizontal furnaces.
•
Ensure upflow or horizontal furnaces are not installed directly on carpeting, or any other combustible material. The only
combustible material allowed is wood.
•
A special accessory subbase must be used for upright counterflow unit installations over any combustible material (including
wood). Refer to subbase instructions for installation details. (NOTE: A subbase will not be required if an air conditioning coil
is located beneath the furnace between the supply air opening and the combustible floor.
•
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:
permanent wave solutions
printing inks
paint removers
varnishes
hydrochloric acid
cements and glues
halogen type refrigerants
•
Seal off a non-direct vent furnace if it is installed near an area frequently contaminated by any of the above substances. This
protects the non-direct vent furnace from airborne contaminants. To ensure that the enclosed non-direct vent furnace has
an adequate supply of combustion air, vent from a nearby uncontaminated room or from outdoors. Refer to the Combustion
and Ventilation Air Requirements for details.
•
If the furnace is used in connection with a cooling coil unit, install the furnace upstream or in parallel with the cooling coil
unit. Premature heat exchanger failure will result if the cooling unit is placed ahead of the furnace.
For vertical (upflow or downflow) 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, ensure the access doors are not 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.
•
On Counterflow Installations, the air conditioning coil must be downstream on the supply (positive) side of the
furnace heat exchanger.
•
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 silicone rubber caulking compound or cement grout.
cleaning solutions (such as perchloroethylene)
chlorinated waxes or cleaners
chlorine-based swimming pool chemicals
water softening chemicals
carbon tetrachloride
deicing salts or chemicals
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
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