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AIR UNCONFINED
330AAV
SPACE FROM
FURNACE
HIGH-FIRE
Free Area
INPUT
of Opening
(BTUH)
(Sq In.)
40,000
100
60,000
100
80,000
100
100,00
100
120,000
120
133,000
133
WASHABLE
FILTER
Fig. 5—Side Filter Arrangement
reinstall in 17-1/2 in. casing. Install small U-shaped end of filter
retaining rod in rear bracket and front of filter retainer rod as
shown in Fig. 6. Two sets of hardware are needed for furnaces in
24-1/2 in. casings using 2 filters for bottom return. All hardware is
provided for filter installation.
NOTE: Furnaces with a 17-1/2 in. wide casing require an
additional procedure when locating filter for bottom return-air
application. Field-fabricate a sheet metal filler strip 1 X 3 X 24-1/2
in. and install it along side of filter as shown in Fig. 6. Drive 2
screws through casing side and into filler strip to secure it in place.
Filter is to rest on top of the filler strip when installed.
WARNING: Never operate unit without a filter or with
filter access door removed. A failure to follow this
warning can cause a fire, personal injury, or death.
IV. LEVELING LEGS (IF REQUIRED)
When furnace is used with side inlet(s) and leveling legs are
required, refer to Fig. 7 and install field-supplied, corrosion-
resistant 5/16-in. machine bolts and nuts.
NOTE: The length of the bolt should not exceed 1-1/2 in.
1. Lay furnace on its back. Locate and drill 5/16-in. diameter
hole in each bottom corner of furnace as shown in Fig. 7.
2. Install nut on bolt and install bolt and nut in hole. (Install
flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat
washer if desired.)
4. Adjust outside nut to provide desired height and tighten
inside nut to secure arrangement.
V. GAS PIPING
Gas piping must be installed in accordance with national and local
codes. Refer to the NFGC NFPA 54-1996/ANSI Z223.1-1996.
Canadian installations must be installed in accordance with NSC-
NGPIC and all authorities having jurisdiction.
TABLE 2—FREE AREA OF COMBUSTION AIR OPENING
OUTDOOR AIR THROUGH
VERTICAL DUCTS
Free Area of
Round
Opening and Duct
Pipe
(Sq In.)
(In. Dia)
10.0
4
15.0
5
20.0
6
25.0
6
30.0
7
33.3
7
FILTER
RETAINER
A93045
—6—
OUTDOOR AIR THROUGH
HORIZONTAL DUCTS
Free Area of
Round
Opening and Duct
Pipe
(Sq In.)
(In. Dia)
20.0
6
30.0
7
40.0
8
50.0
8
60.0
9
66.5
10
3 "
"
1
24
/
2
1 "
FILTER
SUPPORT
Fig. 6—Bottom Filter Arrangement
TABLE 3—FILTER INFORMATION (IN.)
FURNACE
CASING WIDTH
Side Return
14-3/16
(1) 16 X 25 X 1† (1) 14 X 25 X 1 Cleanable
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
(2) 16 X 25 X 1† (1) 24 X 25 X 1 Cleanable
* Filters can be field modified by cutting the frame as marked and folding to the
desired size. Alternate sizes can be ordered from your distributor or dealer.
† Factory provided with the furnace.
The gas supply line should be a separate line running directly from
the gas meter to the furnace, if possible. Refer to Table 4 for
recommended gas pipe size. Risers must be used to connect to
furnace and meter.
OUTDOOR AIR THROUGH
SINGLE DUCT
Free Area of
Round
Opening and Duct
Pipe
(Sq In.)
(In. Dia)
13.4
5
20.0
6
26.7
6
33.4
7
40.0
8
44.4
8
FIELD-SUPPLIED
FILTER FILLER
STRIP FOR
1
17
⁄
-IN. WIDE
2
CASINGS ONLY.
INSTALL UNDER
FILTER.
WASHABLE
FILTER
FILTER
RETAINER
A93321
FILTER SIZE*
FILTER
TYPE
Bottom Return
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