Ductwork And Filter - International comfort products N9MP1 Installation Instructions Manual

Furnace Control Fuse
The 24V circuit contains a 5−amp, automotive−type fuse located
on furnace control. (See Figure 35) Any electrical shorts of 24V
wiring during installation, service, or maintenance may cause fuse
to blow. If fuse replacement is required, use only a fuse of identical
size (5 amp.)
Control Board
Figure 35
Blower Off
Delay Jumper
24 VAC
HUM
FUSE

Ductwork and Filter

WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in
personal injury or death.
Do NOT draw return air from inside a closet or utility
room where furnace is located. Return air duct
MUST be sealed to furnace casing.
Installation
NOTE: Design and install the 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. When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct
outside furnace space.
2. Install air conditioning cooling coil (evaporator) on outlet
side of furnace.
3. For furnaces installed without a cooling coil it is
recommended that the outlet duct be provided with a
removable access panel. This panel should be accessible
when the furnace is installed so the exterior of the heat
exchanger can be viewed for inspections. The access panel
MUST be sealed to prevent leaks.
4. 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.
440 01 1024 04
Diagnostic Light
115 VAC
HUM
EAC
25-24-98
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.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death
or personal injury.
Cool air passing over heat exchanger can cause
condensate to form resulting in heat exchanger
failure.
Connections
NOTE: On upflow installations, return air can enter through either
side, both sides, or the bottom. On horizontal or downflow
installations the return air must enter through the knockout
opening in the lower panel of the furnace. Return air can not enter
through rear of the furnace. When the furnace is located in an area
near or adjacent to the living 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 living areas. It is advisable to route the return
air ducts under the floor or through the attic.
1.
Specifications are subject to change without notice
WARNING
!
For side connections using a 16" x 25" (406.4 x 635mm)
filter , cut out the embossed area shown in Figure 36. This
1
will provide a 14 / " x 22
2
approximate opening.
1
/ " (368.3 x 571.5mm)
2
39