If installing the filter in the furnace blower compartment, deter-
mine location for filter and relocate filter retaining wire, if
necessary. See Table 4 to determine correct filter size for desired
filter location. Table 4 indicates filter size, location, and quantity
shipped with this furnace. See Fig. 2 for location and size of
bottom and side return-air openings.
CAUTION: CUT HAZARD
Failure to follow 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.
CAUTION: UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent
unit operation.
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 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. 26.
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. 27.
NOTE: Remove and discard bottom closure panel when bottom
inlet is used.
VI. BOTTOM CLOSURE PANEL
These furnaces are shipped with bottom enclosure panel installed
in bottom return-air opening. This panel MUST be in place when
side return air is used.
To remove bottom closure panel, perform following:
1. Tilt or raise furnace and remove 2 screws holding front
filler panel. (See Fig. 28.)
2. Rotate front filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall front filler panel and screws.
VII. GAS PIPING
Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC in the United States.
Canadian installations must be made in accordance with NSCNG-
PIC and all authorities having jurisdiction.
Gas supply line should be a separate line running directly from
meter to furnace, if possible. Refer to Table 5 for recommended
gas pipe sizing. Risers must be used to connect to furnace and to
meter. Support all gas piping with appropriate straps, hangers, etc.
Use a minimum of 1 hanger every 6 ft. Joint compound (pipe dope)
should be applied sparingly and only to male threads of joints. Pipe
dope must be resistant to propane gas.
TABLE 4—FILTER INFORMATION
AIR FILTER LOCATED IN BLOWER COMPARTMENT
FURNACE
CASING
WIDTH (IN.)
FILTER SIZE (IN.)
FILTER
TYPE
Side Return†* Bottom Return*
17–1/2 (1) 16 X 25 X 1 (1) 16 X 25 X 1 Cleanable
21 (1) 16 X 25 X 1 (1) 20 X 25 X 1 Cleanable
24–1/2 (1 or 2) 16 X 25 X 1 (1) 24 X 25 X 1 Cleanable
* Factory-provided with the furnace. Filters may be field modified by cutting
filter material and support rods (3) in filters. Alternate sizes and additional
filters can be ordered from your distributor or dealer.
† Upflow only. Alternate sizes and additional filters may be ordered from your
dealer.
Fig. 26—Filter Installed for Side Inlet
A93045
FILTER
RETAINER
WASHABLE
FILTER
Fig. 27—Bottom Filter Arrangement
A00290
WASHABLE
FILTER
FILTER
SUPPORT
FILTER
RETAINER
17
1
⁄2-IN. WIDE
CASINGS ONLY:
INSTALL FIELD-SUPPLIED
FILTER FILLER STRIP
UNDER FILTER.
1″
24
1
/
2
″
3″
21-IN. WIDE
CASINGS ONLY:
SUPPORT RODS (3)
EXTEND 1/4" ON EACH
SIDE OF FILTER AND
REST ON CASING FLANGE
—23—
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