Bottom Closure Panel; Gas Piping - Bryant 345MAV Installation, Start-Up, And Operating Instructions Manual

Factory-supplied washable framed filters are shipped in blower
compartment. Determine location for filter and relocate filter
retaining wire if necessary. See Table 2 to determine correct filter
size for desired filter location. Table 2 indicates filter size,
location, and quantity shipped with this furnace. See Fig. 2 for
location and size of bottom and side return-air openings.
CAUTION: Use care when cutting support rods in filters
to protect against flying pieces and sharp rod ends. Wear
safety glasses, gloves, and appropriate protective cloth-
ing. Failure to follow this caution could result in minor
personal injury.
CAUTION: Air delivery above 1800 CFM requires that
both sides, a combination of 1 side and bottom, or bottom
only of furnace be used for return air. Failure to follow
this caution will result in intermittent unit operation or
performance satisfaction.
NOTE: Side return-air openings can ONLY be used in UPFLOW
configurations. Install filter(s) as shown in Fig. 25.
Bottom return-air opening may be used with all 4 orientations.
Filter may need to be cut to fit some furnace widths. Install filter
as shown in Fig. 26.
NOTE: Remove and discard bottom closure panel when bottom
inlet is used.
F. Bottom Closure Panel
These furnaces are shipped with bottom enclosure panel installed
in bottom return-air opening. This panel MUST be in place when
side return air is used.
To remove bottom closure panel, perform following:
1. Tilt or raise furnace and remove 2 screws holding front
filler panel. (See Fig. 27.)
2. Rotate front filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall front filler panel and screws.
G. Gas Piping
Gas piping must be installed in accordance with national and local
codes. Refer to current edition of NFGC in the United States.
Canadian installations must be made in accordance with NSCNG-
PIC and all authorities having jurisdiction. Gas supply line should
be a separate line running directly from meter to furnace, if
possible. Refer to Table 3 for recommended gas pipe sizing. Risers
must be used to connect to furnace and to meter. Support all gas
piping with appropriate straps, hangers, etc. Use a minimum of 1
hanger every 6 ft. Joint compound (pipe dope) should be applied
sparingly and only to male threads of joints. Pipe dope must be
resistant to propane gas.
TABLE 2—FILTER INFORMATION
FURNACE
FILTER SIZE (IN.)*
CASING
Side Return
WIDTH (IN.)
17-1/2 (1) 16 X 25 X 1†
21 (1) 16 X 25 X 1
24-1/2 (1 or 2) 16 X 25 X 1 (1) 24 X 25 X 1†
* Filters may be field modified by cutting filter material and support rods (3) in
filters. Alternate sizes can be ordered from your distributor or dealer.
† Factory-provided with furnace.
FILTER TYPE
FRAMED
Bottom Return
(1) 16 X 25 X 1† Cleanable
(1) 20 X 25 X 1† Cleanable
Cleanable
—19—
CAUTION: Connect gas pipe to furnace using a backup
wrench to avoid damaging gas controls. Failure to follow
this caution will result in intermittent unit operation or
performance satisfaction.
Fig. 25—Filter Installed for Side Inlet
21-IN. WIDE
1 2
17 -IN. WIDE CASINGS ONLY:
CASINGS ONLY:
SUPPORT RODS (3)
INSTALL FIELD-SUPPLIED
EXTEND 1/4" ON EACH
FILTER FILLER STRIP SIDE OF FILTER AND
UNDER FILTER.
REST ON CASING FLANGE
3
1
24 /
2
1
FILTER
SUPPORT
Fig. 26—Bottom Filter Arrangement
A00217
WASHABLE
FILTER
FILTER
RETAINER
A00290