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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 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
masonry acid washing materials
• Isolate a non-direct furnace from an area
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, air must be
ducted in 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
unit, install the furnace upstream or in parallel
with the cooling coil. Premature heat exchanger
failure will result if the cooling coil is placed
upstream 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.)
C
A
LEARANCES AND
CCESSIBILITY
*MVM97* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
POSITION*
FRONT
SIDES
Upflow
3"
0"
Horizontal
Alcove
6"
C = If placed on combustible floor, floor MUST be wood only.
NOTES:
•
For servicing or cleaning, a 24" front clearance is required.
•
Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
•
In all cases, accessibility clearance must take precedence over
clearances from the enclosure where accessibility clearances are
greater.
*CVM97* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
POSITION*
SIDES
REAR
Counterflow
0"
0"
Horizontal
6"
0"
C = If placed on combustible floor, floor MUST be wood only.
NC = For installation on non-combustible floors only. A combustible subbase
must be used for installations on combustible flooring.
NOTES:
•
For servicing or cleaning, a 24" front clearance is required.
•
Unit connections (electrical, flue and drain) may necessitate
greater clearances than the minimum clearances listed above.
•
In all cases, accessibility clearance must take precedence over
clearances from the enclosure where accessibility clearances are
greater.
(INCHES)
REAR
TOP
FLUE
0"
1"
0"
0"
4"
0"
(INCHES)
FRONT
BOTTOM
FLUE
3"
NC
0"
3"
C
0"
FLOOR
C
C
TOP
1"
6"
9
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