7
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 1-1/2”
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 sub-base must be used for
upright counterflow unit installations over any
combustible material (including wood). Refer
to sub-base instructions for installation details.
(
NOTE:
A sub-base 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)
a
bove 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 sub-base
(see Specification Sheet applicable for your model
for details.) A special accessory sub-base must be
used for upright counterflow unit installations over
any combustible material including wood. Refer
to sub-base instructions for installation details.
Follow the instructions with the sub-base for proper
installation. Do not install the furnace directly on
carpeting, tile, or other combustible material other
than wood flooring. (
NOTE
: The sub-base will not
be required if an air conditioning coil is installed
between the supply air opening on the furnace and
the floor.)
