SUPPLY AIR CONNECTR)NS
Upflow Furnaces
(onnect supply=air duct to 3/4=in flange on f_/mace supply=ai*
outlet. The supply-air duct attachment must ONLY be connected
to fi_rnace supply=/outlet-air duct flanges or air conditioning coil
casing (when used) DO NOT cut main fitmace casing to attach
supply side air duct, humidifier, or other accessories. All accesso=
ries MUST be connected external to furnace main casing
Downflow Furnaces
Connect supply-air duct to supply=air opening on t:m'nace. The
supply=ai* duct attachment must ONLY be connected to t'umace
supply/outlet or air condifioning coil casing (when used), when
installed on non-combustible material When installed on combus=
tible material, supply-air duct attachment n-rest ONLY be con=
nected to an accesso W subbase or fi_ctory approved air condition=
ing coil casing. DO NOT cut main fi/rnace casing to attach supply
side air duct, humidifie*, or other accessmies. All accessories
MUST be connected external to _/mace main casing. Supply air
opening duct flanges must be modified per Fig. 21,
Horizontal Furnaces
(onnect supply=air duct to supply air opening on i_/mace. The
supply=air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used) DO NOT
cut main fi/rnace casing to attach supply side air &ct, humidifier,
or other accessories Atl accessories MUST be connected external
to furnace main casing
RETL RN AIR CONNE(TIONS
The ['urnace and its remm air system shall be designed and
installed so that negative pressure created by the air circulating [hn
cannot affect another appliance's combustion air supply or act to
mix products of combustion with circulating air and the air
circulating fan of the f_/rnace, if installed in an enclosure commu=
nicating with another _/el=burning appliance not of the direct-vent
type, shall be operable only when any door or panel covering an
opening in the _/rnace _hn compartment or in remm air plenun_ on
ducts is in the closed position.
FIRE HAZARD
A failure to follow this warning could result in fire, personal
injuw, or death
Never connect return-air ducts to the back of the l\u'nace
Return=air duct connections on i_/mace side(s) permitted in
upflow applications only.
L pflow Furnaces
The return=air duct must be connected to end, sides (left or right),
or a combination of end and side(s) of main t'urnace casing as
shown in Fig. 2. Bypass humidifier may be attached into unused
side return air portion of the fi/mace casing. DO NOT connect any
portion of return=air duct to back of furnace casing.
Downflow and Horizontal Furnaces
The return-air duct must be connected to end inlet opening
provided as shown in Fig. 2 DO NOT cut into casing sides or back
to attach any portion of return=air duct. Bypass humidifier connec=
tions should be made at ductwork or coil casing sides exterior to
_/rnace_
Table 2--Filter information
FURNACE FILTER SIZE (IN.}* FILTER TYPE
CASING
WIDTH (IN=) Side Return Bottom Return FRAMED
17-1/2 (1) 16 X 25 X 11- (1)16X25X 1 Cleanable
21 (1)16X25X 1 (1)20X 25X It C{eanable
24_1/2 (1 or 2) 16 X 25 X 1 (1) 24 X 25 X It C{eanable
* Filters can be field modified by cutting to the desired size. Alternate sizes
can be ordered from your distributor or dealer
? Factory-provided with furnace.
Step 5--FHter Arrangement
!"_z
FIRE, CARBON MONOXIDE AND POISONING
HAZARD
Failure to %llow this warning could result in fire, personal
inju W, or death
Never operate a unit without a tilter or with filter access door
removed,
Factory=supplied washable framed filters are shipped in blower
compartment Determine location _br filter and relocate filter
retaining wire if necessary See Table 2 to determine correct filter
size _br desired filter location. Table 2 indicates filter size,
location, and quantity shipped with this _i/mace. See Fig 2 for
location and size of bottom and side return-air openings.
M
(TIT HAZARD
Failure to %llow this caution may result in minor 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.
UNIT MAY NOT OPERATE
Failure to _bltow this caution may result in intem_ittent unit
operation.
For airflow requirements above 1800 CFM, see Air Delivew
table in Product Data literature _br specific use of single side
inlets The use of both side inlets, a combination of 1 side and
the bottom, or the bottom only will ensure adequate return air
openings for airflow requirements above 1800 CFM.
NOTE: Side return=air openings can ONLY be used in UPFLOW
configurations. Install filter(s) as shown in Fig. 23.
Bottom return-air opening may be used with all 4 orientations.
Filter may need to be cut to fit some furnace widths. Install filter
as shown in Fig. 24.
NOT[[: Remove and discard bottom closure panel when bottom
inlet is used.
Step g--Bottom Closure Panel
These filrnaces are shipped with bottom enclosure panel installed
in bottom return-air opening This panel MUST be in place when
side return air is used.
18
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