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•
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
chlorine-based swimming pool chemicals
deicing salts or chemicals
halogen type refrigerants
printing inks
varnishes
cements and glues
•
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
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.
8
chlorinated waxes or cleaners
water softening chemicals
carbon tetrachloride
cleaning solutions (such as perchloroethylene)
paint removers
hydrochloric acid
antistatic fabric softeners for clothes dryers
and masonry acid washing materials
*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.
(INCHES)
REAR
TOP
FLUE
0"
1"
0"
0"
4"
0"
FLOOR
C
C
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