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g
humidifier,
or
other
accessories.
All
accessories
MUST
be
connected
external
to furnace
main casing.
Return
Air Connections
FIRE
HAZARD
Failure
to follow this warning
could result in personal
injury,
death or property
damage.
Never
connect
return-air
ducts to the back
of the furnace.
Return
air duct connections
on furnace
side(s)
permitted
in
upflow
applications
only.
Upflow
Furnaces
The return-air
duct must be connected
to bottom,
sides
(left or
right),
or a combination
of bottom
and side(s) of main furnace
casing.
Bypass
humidifier
may
be
attached
into
unused
side
return
air portion
of the furnace
casing.
DO NOT
connect
any
portion
of return-air
duct to back of furnace
casing.
Downflow
and Horizontal
Furnaces
The return-air
duct
nmst
be connected
to return-air
opening
provided.
DO NOT
cut into casing
sides or back to attach any
portion
of return-air
duct.
Bypass
humidifier
connections
should
be made at ductwork
or coil casing sides exterior
to furnace.
Filter
Arrangement
FIRE,
CARBON
MONOXIDE
AND POISONING
HAZARD
Failure
to follow
this warning
could
result
in personal
injury,
death or property
damage.
Never
operate
unit without
a filter or with filter access door
removed.
The air filter
arrangement
will vary
due to application,
furnace
orientation
and
filter
type.
The
filter
may
be
installed
in an
external
Filter/Media
cabinet
(if provided)
or the furnace
blower
compartment.
Factory
supplied
washable
filters are shipped
in the
blower
compartment.
If a factory-supplied
external
Filter/Media
cabinet
is provided,
instructions
for its
application,
assembly,
and
installation
are
packaged
with the cabinet.
The Filter/Media
cabinet
can be used
with the factory-supplied
washable
filter
or a factory-specified
high-efficiency
disposable
filter (see cabinet
instructions).
If installing
the
filter
in
the
furnace
blower
compartment,
determine
location
for filter
and relocate
filter retaining
wire, if
necessary.
See Table 2 to determine
correct
filter size for desired
filter location.
Table 2 indicates
filter size, location,
and quantity
shipped
with
this furnace.
See Fig. 2 for location
and size of
bottom
and side return-air
openings.
CUT HAZARD
Failure to follow
this caution
may result in personal
injury.
Use care when
cutting
support
rods
in filters
to protect
against
flying
pieces
and
sharp
rod
ends.
Wear
safety
glasses,
gloves,
and appropriate
protective
clothing.
[]NIT
MAY NOT
OPERATE
Failure to follow
this caution
may result in intermittent
unit
operation
or performance
satisfaction.
For
airflow
requirements
above
1800
CFM,
see
Air
Delivery
table in Product
Data literature
for specific
use of
single side inlets.
The use of both side inlets, a combination
of one side and the bottom,
or the bottom
only will ensure
adequate
return air openings
for airflow
requirements
above
1800 CFM.
Table
2 - Filter Information
- In. (mm)
AIR FILTER
LOCATED
IN BLOWER COMPARTMENT
Filter Size
Furnace
Casing
Width
Side
Return
Bottom
Return*
Filter Type
Framed
17-1/2
(1) 16x
25 x 3/4
t
(1) 16 x 25 x 3/4t
Washable
(445)
(406
x 635
x 19)
(406
x 635
x 19)
2t
(1) 16 x 25 x 3/4"
(1) 20 x 25 x 3/4t
Washable
(533)
(406
x 635
x 19)
(508
x 635
x 19)
24-1/2
(1 or
2)
t6 x 25 x 3/4"
(1) 24 x 25 x 3/4t
Washable
(622)
(406
x 635
x 19)
(610
x 635
x 19)
* Filters
may be field modified
by cutting
filter material
and support
rods (3) in filters.
Alternate
sizes can be ordered
from your distributor
or dealer
t Factory-provided
with the furnace
FILTER
RETAINER
Fig. 24 - Filter
Installed
for Side Inlet
A93045
22
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