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

SUPPLY
AIR
INTERIOR
HEATED
SPACE
RETURN AIR
* Minimum opening size is 100 sq in. with
minimum dimensions of 3 in.
†
Minimum of 3 in. when type-B1 vent is used.
Fig. 3—Confined Space: Air For Combustion and Ventila-
tion from an Indoor Unconfined Space
AIR FROM INDOOR
383KAV
UNCONFINED SPACE
FURNACE
Free Area
INPUT
of Opening
(BTUH)
(Sq In.)
44,000 100
66,000 100
88,000 100
110,000 110
132,000 132
154,000 154
* Free area shall be equal to or greater than the sum of the areas of all vent connectors in the confined space. Opening area must be increased, if other gas appliances
in the space require combustion air.
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
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
VENT THROUGH ROOF
12" MAX
1 SQ IN.
PER 1000
BTUH * IN DOOR
OR WALL
UNCONFINED
SPACE
6 " MIN
(FRONT) †
1 SQ IN.
PER 1000
BTUH * IN DOOR
OR WALL
12" MAX
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→TABLE 2—MINIMUM FREE AREA OF COMBUSTION AIR OPENING
OUTDOOR AIR THROUGH
VERTICAL DUCTS
Free Area of
Opening and Duct
(Sq In.)
11.0
16.5
22.0
27.5
33.0
38.5
OUTDOORS
12 " MAX
1 SQ IN.
PER 2000
BTUH *
DUCTS
TO
OUTDOORS
1 SQ IN.
PER 2000
BTUH *
12 " MAX
RETURN AIR
* Minimum dimensions of 3 in.
NOTE: Use any of the following
combinations of openings:
A & B
Fig. 4—Confined Space: Air For Combustion and Ventila-
OUTDOOR AIR THROUGH
HORIZONTAL DUCTS
Round Free Area of
Pipe Opening and Duct
(In. Dia) (Sq In.)
4 22.0
5 33.0
6 44.0
6 55.0
7 66.0
8 77.0
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
WARNING: Never connect return-air ducts to the back
of the furnace. A failure to follow this warning can cause
a fire, personal injury, or death.
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
—6—
DUCTS
TO
D
VENT
A
THROUGH
SUPPLY ROOF
AIR
E
B
C
12 " MAX
DUCT
TO
OUTDOORS
C & D D & E F & G
tion from Outdoors
OUTDOOR AIR THROUGH
SINGLE DUCT
Round Free Area of
Pipe Opening and Duct
(In. Dia) (Sq In.)
6 14.67
7 22.00
8 29.33
9 36.67
10 44.00
10 51.33
1 SQ IN.
PER 4000
BTUH *
12"
MAX
F
1 SQ IN.
PER
4000
BTUH*
1 SQ IN.
PER
4000
BTUH*
G
12"
MAX
1 SQ IN.
PER 4000
BTUH *
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Round
Pipe
(In. Dia)
5
6
7
7
8
9