AdditionOf Air Conditioning
When a refrigeration coil is used in conjunction with this unit, it
must be installed on the discharge side of the unit to avoid con-
densation on the heat exchanger. The coil installation instructions
must be consulted for proper coil location and installation proce-
dures. With a parallel flow arrangement, dampers must be
installed to prevent chilled air from entering the furnace. If manu-
ally operated dampers are used, they must be equipped with a
means to prevent operation of either unit unless the damper is in
full heat or full cool position.
A 3" (75mm) clearance is required on the right side of the furnace
in order to run the condensate drain line. Copper, iron or plastic
tubing may be used for the condensate drain line.
Stando,Filter.aok
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Filters Installed on Two Sides
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25-21-45
8. DuctworkandFilterfor (DownflowlHorizontal)(NCGMIGCK)
Poison carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or utility
room. Return air duct MUST be sealed to furnace casing.
Failure to properly seal duct can result in death, personal
injury and/or property damage.
4.
It is recommended for furnaces installed without a cooling
coil that the outlet duct be provided with a removable ac-
cess panel. This panel should be accessible when the fur-
nace is installed so that the heat exchanger can be viewed
for inspections. The access panel MUST be sealed to pre-
vent leaks.
NOTE: Dampers (field supplied) can be either automatic or
manual. Manually operated dampers MUST be equipped with a
means to prevent furnace or air conditioning operation unless
damper is in the full heat or cool position.
Installation
NOTE: Design and install air distribution system to comply with
Air Conditioning Contractors of America manuals and/or NFPA
pamphlets 90A and 90B or other approved methods that conform
to local codes and good trade practices.
1.
2.
3.
When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct
outside furnace space.
Install air conditioning cooling coil (evaporator) on dis-
charge side of furnace.
If separate evaporator and blower units are used, install
good sealing dampers for air flow control. Chilled air going
through the furnace could cause condensation and shorten
the furnace life.
Poison carbon monoxide gas hazard.
Cool air passing over heat exchanger can cause con-
densate to form resulting in heat exchanger failure.
This could result in death, personal injury and/or prop-
erty damage.
Connections
NOTE: Return air can enter through the top of the furnace only.
When the furnace is located in an area near or adjacent to the liv-
ing area, the system should be carefully designed with returns to
minimize noise transmission through the return grille. Any blower
moving a high volume of air will produce audible noise which
could be objectionable to when the unit is located very close to liv-
440 01 100201 [_
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