7
• Refer to
Vent/Flue Pipe and Combustion Air Pipe
-Termination Locations
for appropriate termination
locations and to determine if the 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 1-½” 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
chlorinated waxes or cleaners
chlorine-based
carbon tetrachloride
water softening chemicals
swimming pool chemicals
deicing salts or chemicals
halogen type refrigerants
printing inks
cleaning solutions (such as perchloroethylene)
paint removers
varnishes
hydrochloric acid
cements and glues
antistatic fabric softeners for clothes dryers
masonry acid washing materials
•
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.
•
Counterflow Installation over a combustible floor.
If installation over a combustible floor becomes
necessary, use an accessory subbase (see
Specification Sheet applicable for your model for
details.) 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. Follow the
instructions with the subbase for proper installation.
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.)
