Step 5—Filter Arrangement
Never operate unit without a filter or with blower access
panel removed. Failure to follow this caution will result in
minor unit operation or performance satisfaction.
Factory-supplied washable framed filters are shipped in 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.
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. Failure to follow this
caution could result in minor personal injury.
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. Failure
to follow this caution will result in minor unit operation or
performance satisfaction.
NOTE: Side return-air openings can ONLY be used in UPFLOW
configurations. Install filter(s) as shown in Fig. 25.
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. 26.
Step 6—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. 27.)
2. Rotate front filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall front filler panel and screws.
Step 7—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 3 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.
Connect gas pipe to furnace using a backup wrench to avoid
damaging gas controls. Failure to follow this caution will
result in minor unit operation or performance satisfaction.
Gas valve ON and OFF switch MUST be facing forward or
tilted upward. (See Fig. 46.) Failure to follow this warning
could result in property damage or death.
Never purge a gas line into a combustion chamber. Use a
commercially available soap solution made specifically for
the detection of leaks to check all connections. A failure to
follow this warning could result in fire, explosion, personal
injury, or death.
Use proper length of pipe to avoid stress on gas control
manifold. Failure to follow this warning could result in a gas
leak resulting in fire, explosion, personal injury, or death.
Install a sediment trap in riser leading to furnace. Trap can be
installed by connecting a tee to riser leading to furnace so
straight-through section of tee is vertical. Then connect a capped
nipple into lower end of tee. Capped nipple should extend below
level of gas controls. Place a ground joint union between gas
control manifold and manual gas shutoff valve. (See Fig. 28.)
Fig. 23—Duct Flanges
A93029
NO
YES
YES
PERFORATED
DISCHARGE DUCT
FLANGE
210°
MIN
Table 2—Filter Information
FURNACE
CASING
WIDTH (IN.)
FILTER SIZE (IN.)*
FILTER TYPE
FRAMED
Side Return Bottom Return
17-1/2 (1)16X25X1† (1)16X25X1† Cleanable
21 (1)16X25X1 (1)20X25X1† Cleanable
24-1/2 (1or2)16X25X1 (1)24X25X1† Cleanable
* 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.
† Factory-provided with furnace.
19
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