Ductwork Acoustical Treatment; Supply-Air Connections; Return-Air Connections; Filter Arrangement - Bryant Series G 383KAV Installation, Start-Up, And Operating Instructions Manual

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AIR FROM UNCON-
383KAV
FINED SPACE
FURNACE
HIGH-FIRE
Free Area
INPUT
of Opening
(BTUH)
(Sq In.)
44,000 100
66,000 100
88,000 100
110,000 115
132,000 138
154,000 154
When a furnace is installed so that the supply ducts carry air to
areas outside the space containing the furnace, the return air must
also be handled by a duct(s) sealed to the furnace casing and
terminating outside the space containing the furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply- and return-duct connections to furnace with code
approved tape or duct sealer.
Flexible connections should be used between ductwork and
furnace to prevent transmission of vibration. Ductwork passing
through unconditioned space should be insulated to enhance
system performance. When air conditioning is used, a vapor
barrier is recommended.
Maintain a 1-in. clearance from combustible materials to supply air
ductwork for a distance of 36 in. horizontally from the furnace. See
NFPA 90B or local code for further requirements.
II. DUCTWORK ACOUSTICAL TREATMENT
Metal duct systems that do not have a 90 degree elbow and 10 ft
of main duct to the first branch take-off may require internal
acoustical lining. As an alternative, fibrous ductwork may be used
if constructed and installed in accordance with the latest edition of
SMACNA construction standard on fibrous glass ducts. Both
acoustical lining and fibrous ductwork shall comply with NFPA
90B as tested by UL Standard 181 for Class 1 Rigid air ducts.
III. SUPPLY AIR CONNECTIONS
A. Upflow Furnaces
Connect supply-air duct to 3/4-in. flange on furnace supply-air
outlet. The supply-air duct attachment must ONLY be connected
to furnace supply-/outlet-air duct flanges or air conditioning coil
casing (when used). DO NOT cut main furnace casing to attach
supply side air duct, humidifier, or other accessories. All accesso-
ries MUST be connected external to furnace main casing.
IV. RETURN AIR CONNECTIONS
A. 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 as shown in Fig. 1. 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.
V. FILTER ARRANGEMENT
The factory-supplied filter(s) is shipped in the blower compart-
ment. Determine location for the filter and relocate filter retaining
wire if necessary. See Fig. 5 for side return application and Fig. 6
for bottom return application. See Table 3 to determine correct
filter size for desired filter location. Table 3 indicates filter size,
location, and quantity shipped with the furnace.
For bottom air-return applications, filter may need to be cut to fit
some furnace casing widths. A bottom closure panel is factory
installed in the bottom of the furnace. When bottom return inlet is
desired, remove and discard the bottom closure panel. Two sets of
hardware are needed for furnaces in 24-1/2-in. wide casings using
2 filters for bottom return. All hardware is provided for filter
installation.
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)
11.0 4
16.5 5
22.0 6
27.5 6
33.0 7
38.5 8
—6—
OUTDOOR AIR THROUGH
HORIZONTAL DUCTS
Free Area of Round
Opening and Duct Pipe
(Sq In.) (In. Dia)
22.0 6
33.0 7
44.0 8
55.0 9
66.0 10
77.0 10
WASHABLE
FILTER
Fig. 5—Side Filter Arrangement
(Control Removed for Clarity)
NOTE: Furnaces with a 17-1/2-in. wide casing require an addi-
tional procedure when locating the 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 the filter as shown in Fig. 6. Drive
2 screws through the casing side and into the filler strip to secure
it in place. Filter should rest on the top of the filler strip when
installed.
WARNING: Never operate unit without a filter or with
filter access door removed. Failure to follow this warning
can cause fire, personal injury, or death.
VI. LEVELING LEGS (IF REQUIRED)
When the 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 maximum 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.
VII. GAS PIPING
Gas piping must be installed in accordance with national and local
codes. Refer to the current edition of the NFGC. Canadian
installations must be installed in accordance with NSCNGPIC and
all authorities having jurisdiction.
OUTDOOR AIR THROUGH
SINGLE DUCT
Free Area of Round
Opening and Duct Pipe
(Sq In.) (In. Dia)
14.67 5
22.00 6
29.33 7
36.67 7
44.00 8
51.33 9
FILTER
RETAINER
A93045