Return Air Connections - Bryant 352AAV Installation, Start-Up, And Operating Instructions Manual

supply side air duct, humidifier, or other accessories. All
accessories MUST be connected external to furnace main casing.
Downflow Furnaces
Connect supply-air duct to supply-air opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used), when
installed on non-combustible material. When installed on
combustible material, supply-air duct attachment must ONLY be
connected to an accessory subbase or factory approved air
conditioning coil casing. DO NOT cut main furnace casing to
attach supply side air duct, humidifier, or other accessories. All
accessories MUST be connected external to furnace main casing.
Supply air opening duct flanges must be modified per Fig. 24.
Horizontal Furnaces
Connect supply-air duct to supply air opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used). DO
NOT cut main furnace casing to attach supply side air duct,
humidifier, or other accessories. All accessories MUST be
connected external to furnace main casing.

RETURN AIR CONNECTIONS

The furnace and its return air system shall be designed and
installed so that negative pressure created by the air circulating
fan cannot affect another appliance's combustion air supply or act
to mix products of combustion with circulating air, and that the
air circulating fan of the furnace, if installed in an enclosure
3-IN. (76 mm) MINIMUM CLEARANCE TO
COMBUSTION-AIR INTAKE IS REQUIRED
(NON-DIRECT VENT/1-PIPE
APPLICATION,)
ANGLE
IRON OR
EQUIVALENT
(B)
(A) ROD LOCATION
USING DIMPLE
LOCATORS
(SEE DIMENSIONAL
DWG FOR
LOCATIONS)
(A) PREFERRED ROD LOCATION
(B) ALTERNATE ROD LOCATION
Fig. 25 - - Crawlspace Horizontal Application for Direct Vent/2-Pipe Installation
communicating with another fuel-burning appliance not of the
direct-vent type, shall be operable only when any door or panel
covering an opening in the furnace fan compartment or in a return
air plenum on ducts in the closed position.
FIRE HAZARD
Failure to follow this warning could result in fire, personal
injury, or death.
Never connect return-air ducts to the back of the furnace.
Return-air duct connections on furnace side(s) permitted in
upflow applications only.
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. 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.
Downflow and Horizontal Furnaces
The return-air duct must be connected to return-air opening
provided. DO NOT cut into casing sides or back to attach any
portion of return-air duct. Bypass humidifier connections should
be made at ductwork or coil casing sides exterior to furnace.
COMBUSTION-AIR INTAKE
(NON-DIRECT VENT/1-PIPE
APPLICATION)
3
5
(B)
(A)
DRAIN
3
/ -IN. HEX NUT (A) (B)
8
& WASHER (4)
REQD PER ROD
NOTES:
1. A 1-in. (25.4 mm) clearance minimum
between top of furnace and combustible
material.
2. The entire length of furnace must be
supported when furnace is used in horizontal
position to ensure proper drainage.
3. For non-direct vent/1-pipe application,
bottom side combustion-air entry cannot be
used when furnace is installed with hangers
as shown.
and for Non-Direct Vent/1-Pipe Installation
24
WARNING
!
COMBUSTION-AIR PIPE
(DIRECT VENT/2-PIPE
APPLICATION,ALL SIZES)
VENT
3
/
8 -IN. (10 mm) ROD
"
/
(146 mm)
4
ALTERNATE SUPPORT
LOCATION 4-IN. (102 mm) MIN
8-IN. (203 mm) MAX
(A)
(B)
13
/ -IN. (21 mm) MAX
16
ALTERNATE SUPPORT
LOCATION FROM BACK
A05054