14
441 01 2610 00
Control Center Fuse
The 24V circuit contains a 5--amp, automotive--type fuse located
on control center. (See
Figure 10
) Any electrical shorts of 24V wir-
ing during installation, service, or maintenance may cause fuse to
blow. If fuse replacement is required, use only a fuse of identical
size (5 amp.)
Fan Timer Connections
Figure 10
25--23--41
DIP Switch
FUSE
8. Ductwork and Filter (Upflow/Horizontal)
CARBON MONOXIDE POISONING HAZARD.
Failure to properly seal duct can result in death
and/or personal injury.
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.
!
Duct Connections
This furnace may be installed in only a bottom or side return ap-
plication. Return air through the back of the unit is
NOT
allowed.
Side connections can be made by cutting out the embossed area
shown in
Figure 11.
Cutting Side Return Air Opening
Starting
Hole
Figure 11
Bottom returns can be made by removing the knockout panel in
the furnace base. Do
NOT
remove knock-out except for a bottom
return.
Duct Design
Design and install air distribution system to comply with Air Condi-
tioning Contractors of America manuals or other approved meth-
ods that conform to local codes and good trade practices.
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 air grille. Any
blower moving a high volume of air will produce audible noise
which could be objectionable when the unit is located very close to
a living area. It is often advisable to route the return air ducts under
the floor or through the attic.
·
Refer to furnace
Technical Support Manual
(Blower Data)
for air flow information.
·
Size ductwork to handle air flow for heating and air condition-
ing if used.
Duct Installation Requirements
·
When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct out-
side furnace space.
·
When a refrigeration coil is used in conjunction with this unit, it
must be installed on the discharge side of the unit to avoid
condensation on the heat exchanger.
·
If separate evaporator and blower unit is used, install good
sealing dampers for air flow control. Chilled air going through
the furnace could cause condensation and shorten furnace
life. Dampers (purchased locally) 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.
This could result in personal injury and/or death.
Cool air passing over heat exchanger can cause
condensate to form resulting in heat exchanger failure.
·
Installation of locking-type dampers are recommended in all
branches, or in individual ducts to balance system’s air flow.
·
If air return grille is located close to the fan inlet, install at least
one, 90
°
air turn between fan and inlet grille to reduce noise.
·
Ductwork installed in attic, or exposed to outside tempera-
tures requires a minimum of 2
²
of insulation with outdoor type
vapor barrier.
·
Ductwork installed in an indoor unconditioned space requires
a minimum of 1
²
of insulation with indoor type vapor barrier.
