7
Top - 1"
Side
Clearance - 1"
Back - 0"
Front Clearance - 3"
Vent Pipe Clearance to Combustibles-
6" using Single Wall Connector or 1"
using B-1 vent.
•
Adequate combustion/ventilation air must be supplied
to the closet.
• Furnace must be
completely
sealed to floor or
base. Combustion/ ventilation air supply pipes must
terminate 12” from top of closet and 12” from floor
of closet. DO NOT remove solid base plate for side
return.
• Return air ducts must be
completely
sealed to
the furnace and terminate outside the enclosure
surfaces.
Clearances and Accessibility
Clearance in accordance with local installation codes, the
requirements of the gas supplier and the manufacturer’s
installation instructions.
Dיgaugement conforme aux codes d’installation locaux, aux
exigences du fournisseur de gaz et aux instructions
d’installation du fabricant.
Unobstructed front clearance of 24”
for servicing
is recom-
mended.
TOP
B1-VENT SINGLE
(PLENUM)
1"
6"
1"
3"
0"
1"
VENT
SIDES
FRONT
BACK
Top clearance for horizontal configuration - 1”
Installation Positions
An upflow furnace may be installed in an upright position or
horizontal on either the left or right side panel. Do not install
this furnace on its back. For vertically installed
upflow
furnac-
es, return air ductwork may be attached to the side panel(s)
and/or basepan. For
horizontally
installed
upflow
furnaces,
return air ductwork must be attached to the basepan. For
counterflow
furnaces, return ductwork must be attached to
the top end of the blower compartment.
NOTE:
Ductwork must never be attached to the back 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, the furnace
access doors must be vertical so that the burners fire
horizontally into the heat exchanger. 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.
•
For counterflow installations, the air conditioning coil
must be downstream from the heat exchanger of the
furnace.
•
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 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.
(
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.
