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4.3
INSTALLATION IN UPFLOW POSITION
UPFLOW INSTALLATION: Vent positioning, pressure switch location and drain locations shall be performed in
accordance with instructions in the appropriate sections of this manual.
NON-SUSPENDED INSTALLATION: Maintain clearances to combustibles as outlined in Table B. The furnace
must be supported in such a way as to not allow twisting or sagging of the cabinet.
IMPORTANT
:
• THE FURNACE MUST BE INSTALLED ON A LEVEL SURFACE. IT IS RECOMMENDED
THAT THE REAR OF THE FURNACE BE ELEVATED 1/4" (6 mm) HIGHER THAN THE
FRONT TO FACILITATE PROPER CONDENSATE DRAINAGE.
• IF THE FURNACE AND AIR CONDITIONER IS LOCATED ABOVE A FINISHED SPACE,
INSTALL A DRAIN PAN UNDERNEATH THE UNIT.
NOTE
THIS FURNACE IS CERTIFIED FOR UPFLOW INSTALLATION ONLY.
This furnace is 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). It is not
permissible to use a rear return on this appliance. Use only side and bottom returns.
4.4
AIR CONDITIONING
This furnace may be used as part of an air conditioning system. The furnace wiring and control system is "air
conditioning ready." There are the following factors to consider:
The air conditioning evaporator coil must be downstream of the heat exchanger. The cooled air passing
over the warmer heat exchanger tubes can cause condensation inside the tubes, resulting in corrosion and
premature failure.
If installing a two stage air conditioning system, clip the JW38 jumper wire between Y (low cool) and Y2 (high
cool) on the furnace control board.
Control defaults to Y2 (high cool) if JW38 jumper wire is NOT cut.
H8.3.3
H8.4.4
W415-2306 / C / 09.22.20
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