7
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"
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.
C
LEARANCES
AND
A
CCESSIBILITY
Unobstructed front clearance of 24"
for servicing
is recommended.
T O P
B1-V EN T
S IN G LE
(P LE N U M )
1"
6"
1"
3"
0"
1"
VEN T
SID ES
F R O N T
B AC K
Top clearance for horizontal configuration - 1"
I
NSTALLATION
P
OSITIONS
An upflow furnace may be installed in an upright position or hori-
zontal on either the left or right side panel. Do not install this
furnace on its back. For vertically installed
upflow
furnaces, re-
turn 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
fur-
naces, 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.
H
ORIZONTAL
I
NSTALLATION
For
horizontal installations,
insert the
#8 x 5/8 screw
from the
literature package.
Line contact to framing is permitted when installed in the horizon-
tal configuration. Line contact is defined as the portion of the
cabinet that is formed by the intersection of the top and side.
ACCESSIBILITY CLEARANCE, WHERE GREATER, SHOULD TAKE PRECE-
DENCE OVER MINIMUM FIRE PROTECTION CLEARANCE. A gas-fired
furnace for installation in a residential garage must be installed
