Bryant Bruant 4 Way Gas 355AAV - Manual (Page 24)

24
RETURN AIR CONNECTIONS
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.
!
WARNING
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.
Step 5 — Filter Arrangement
FIRE, CARBON MONOXIDE AND POISONING
HAZARD
Failure to follow this warning could result in personal injury
or death.
Never operate unit without a filter or with filter access door
removed.
!
WARNING
The air filter arrangement will vary due to application, furnace
orientation, and filter type. The filter may be installed in an
external Filter/Media cabinet (if provided) or the furnace blower
compartment. Factory supplied washable filters are shipped in the
blower compartment.
If a factory--supplied external Filter/Media cabinet is provided,
instructions for its application, assembly, and installation are
packaged with the cabinet. The Filter/Media cabinet can be used
with the factory--supplied washable filter or a factory--specified
high--efficiency disposable filter (see cabinet instructions). If
installing the filter in the furnace blower compartment, determine
location for filter and relocate filter retaining wire, if necessary. See
Table 4 to determine correct filter size for desired filter location.
Table 4 indicates filter size, location, and quantity shipped with this
furnace. See Fig. 2 for location and size of bottom and side
return--air openings.
CUT HAZARD
Failure to follow this caution may result in personal injury.
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.
CAUTION
!
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit
operation or performance satisfaction.
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.
CAUTION
!
NOTE: Side return--air openings can ONLY be used in UPFLOW
configurations. Install filter(s) as shown in Fig. 27.
For bottom return--air applications, filter may need to be cut to fit
some furnace widths. Install filter as shown in Fig. 28.
Table 4 – Filter Information
AIR FILTER LOCATED IN BLOWER COMPARTMENT
Furnace
Casing
Width
In. (mm)
Filter Size --- In. (mm)
Filter Type
Framed
Side Return*{ Bottom Return*
17---1/2
(445)
(1) 16 X 25 X 3/4
(406 X 635 X 19)
(1) 16 X 25 X 3/4
(406 X 635 X 19)
Washable
21
(533)
(1) 16 X 25 X 3/4
(406 X 635 X 19)
(1) 20 X 25 X 3/4
(508 X 635 X 19)
Washable
24---1/2
(622)
(1 or 2) 16 X 25
X 3/4
(406 X 635 X 19)
(1) 24 X 25 X 3/4
(609 X 635 X 19)
Washable
* Factory---provided with the furnace. Filters may be field modified by cut-
ting filter material and support rods (3) in filters. Alternate sizes can be
ordered from your distributor or dealer.
{
Upflow only. Alternate sizes and additional filters may be ordered from
your dealer.
355A