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Whirlpool WFM18 Installation Instructions Manual page 6

80% single-stage multispeed gas furnace


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Goodman 50
To prevent possible equipment damage, property damage,
personal injury or death, the following bullet points must
be observed when installing the unit.
Follow the instructions listed below when selecting a furnace
location. Refer also to the guidelines provided in "Combustion
and Ventilation Air Requirements."
Centrally locate the furnace with respect to the proposed or
existing air distribution system.
Check that the temperature of the return air entering the
furnace is between 55°F and 100°F (13ºC and 38ºC) when the
furnace is heating.
Provide provisions for venting combustion products outdoors
through a proper venting system. Special consideration
should be given to the vent/flue pipe routing and the
combustion air intake pipe when applicable. Refer to "Vent/
Flue Pipe and Combustion Air Pipe—Termination Locations"
for appropriate termination locations and to determine if the
piping system from the furnace to the 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.
Check that 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 1¹⁄₂" (3.8 cm) larger than the base of the
furnace. Refer to "Horizontal Applications and
Considerations" for leveling of horizontal furnaces.
Check that the upflow or horizontal furnaces are not installed
directly on carpeting, or any other combustible material.
NOTE: The only combustible material allowed is wood.
Exposure to contaminated combustion air will result in safety
and performance-related problems.
NOTE: 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
Hydrochloric acid
Cements and glues
Antistatic fabric softeners for clothes dryers
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.
Premature heat exchanger failure will result if the cooling unit
is placed ahead of the furnace.
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" (45.7 cm) 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.
NOTE: 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, check that 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.
The subbase will not be required if an air conditioning coil
is installed between the supply air opening on the furnace
and the floor.
Adequate combustion/ventilation air must be supplied to the
closet or enclosure.
Furnace must be completely sealed to the floor or base.
Combustion/ventilation air supply pipes must terminate 12"
(30.5 cm) from the top of the closet or enclosure and 12"
(30.5 cm) from the floor of the closet or enclosure.
NOTE: Do not remove the solid base plate for the side return.
Return air ducts must be completely sealed to the furnace
and terminate outside the enclosure surfaces.


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