Installation Guide

8
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.
Top - 1"
Side
Clearance - 1"
Back - 0"
Front Clearance - 3"
V
ent 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 supplies and the manufacturer’s
installation instructions.
Dégaugement conforme aux codes d’installation locaux, aux
exigences du fournisseur de gaz et aux instrions d’installatino du
fabricant.
Unobstructed front clearance of 24" for servicing is recommended.
TOP
B1-VENT SINGLE
(PLENUM)
1" 6" 1" 3" 0" 1"
VENT
SIDES FRONT BACK
Top clearance for horizontal configuration - 1"
INSTALLATION P OSITIONS
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 furnaces, 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.