B. If this furnace is to be installed in an area over a fi nished
ceiling or living area, install a fi eld fabricated auxiliary
drain pan under the furnace to protect that area from acci-
dental condensate spills. Th
e auxiliary pan should be large
enough to collect accidentally spilled condensate from the
air conditioning evaporator coil assembly if applicable.
NOTICE
Th
ese furnaces are approved for installation in attics,
alcoves, utility rooms, closets and crawl spaces. If this
furnace is to be installed in a utility room, be sure that it
is located in such a way as to allow access for servicing or
the removal of other appliances installed in the room (hot
water heater, for example).
C. If the furnace is installed in an area where freezing may oc-
cur, a garage, an attic, a crawl space or any unconditioned
space, steps must be taken to protect the condensate trap
and drain line from freezing. One possible measure could
be to use a self-regulating 5 or 6 watt per foot heat tape
covered with a jacket of insulation. Heat tapes are available
in plumbing supply houses.
3.
INSTALLATION IN UPFLOW, DOWNFLOW OR HORI-
ZONTAL POSITIONS
• UPFLOW INSTALLATION:
Vent positioning, pressure
switch location and drain locations shall be performed in ac-
cordance with instructions in the appropriate sections of this
manual.
• HORIZONTAL INSTALLATION:
Vent positioning, pres-
sure switch location and drain locations shall be performed
in accordance with instructions in the appropriate sections of
this manual.
• NON-SUSPENDED INSTALLATION:
Maintain clear-
ances to combustibles as outlined in
Figure 2, Table 2
.
Th
e furnace must be supported in such a way as to not allow
twisting or sagging of the cabinet.
• SUSPENDED INSTALLATION:
Maintain clearances to
combustibles as outlined in
Figure 2, Table 2
. Th
e furnace
may be suspended by fi eld fabricating a cradle of angle iron
and threaded rod. Secure the furnace with 2” minimum slot-
ted angle or equivalent as shown in
Figure 4.
Th
e furnace
must be supported in such a way as to not allow twisting or
sagging of the cabinet. Position the supports so as to not in-
terfere with accessing the burner and blower compartments.
•
DOWNFLOW INSTALLATION:
Vent positioning, pres-
sure switch location and drain locations shall be performed
in accordance with instructions in the appropriate sections of
this manual.
Th
e opening in the fl oor must provide adequate clearances to the
combustible material. A ½” clearance will be required between
the plenum and the combustible material. For sections of plenum
with direct line of sight with heat exchanger, a 1” clearance will be
required. If installed on a non combustible material, zero clearance
is required. Optional subbase kit 550001346 will assist in achieving
required clearances.
NOTICE
IMPORTANT: Th
e rear of the furnace must be elevated
1/4” higher than the front from a level position to facilitate
proper condensate drainage.
NOTICE
IMPORTANT: If the furnace and air conditioner is above a
fi nished space, install a drain pan underneath the unit.
NOTICE
NOTE: It is not permissible to use a rear return on this
appliance. Use only side and end returns.
4.
AIR CONDITIONING Th
is furnace may be used as part of an
air conditioning system. Th
e furnace wiring and control system
is “air conditioning ready.” Th
ere are the following factors to
consider:
• Th
e air conditioning evaporator coil must be downstream
of the heat exchanger. Th
e cooled air passing over the
warmer heat exchanger tubes can cause condensation in-
side the tubes, resulting in corrosion and premature failure.
• A parallel duct system can be installed to direct the air from
the furnace through the evaporator coil only. Use dampers
or other means to bypass the heat exchanger. If (summer/
winter) dampers are used, they should be interlocked to
prevent system operation unless the dampers are in the full
open or full closed position.
5 - COMBUSTIBLE CLEARANCES
5 - LOCATION OF UNIT
11
