Bryant 376B - Manual (Page 3)

Figure 7—Furnace, Plenum, and
Base Installed on a Combustible Floor
2. Cut and frame hole in floor per dimensions in Table I of
Installation Instructions packaged with combustible
floor base. If this requires cutting of a floor joist, tie
ends of cut joist into adjacent joists so that proper
floor support will be maintained.
3. Assemble and install combustible floor base per
instructions packaged with base.
4. When completed, combustible floor base, plenum, and
furnace (or coil casing when used) should be installed as
shown in Figure 7.
VI. HORIZONTAL ATTIC INSTALLATION
The 376B Furnace can be installed horizontally on either the
LH or RH side. A typical attic installation is shown in Fig­
ure 8.
NOTE: The National Fuel Gas Code requires the use of a
type B1 vent in an attic or concealed space.
A. Construct a working platform.
1. Place working platform in location where all required
furnace clearances are obteunable. See Table I.
2. Use materials in platform that will support installer
and service persons.
3. Secure platform to building j oists.
LINE CONTACT ONLY PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES OF THE FURNACE
JACKET AND BUILDING JOISTS,
STUDS OR FRAMING.'
B. Install furnace
1. Position furnace in desired location.
2. Connect gas supply pipe. See Figure 8 for typical pip­
ing entry. It is important to install a sediment trap in
the gas pipe riser.
3. Cormect supply- and return-air ducts.
a. Install field-supplied duct flanges as shown in Fig­
ure 9.
b. Using appropriate fasteners for type of supply-air
duct being used, connect duct to furnace.
c. Install field-supplied filter retainers as indicated in
Figure 10 and Table V before connecting retum-air
duct to furnace.
NOTE: For ease of servicing, a return-air filter can be
installed in a common retum-air grille. The air velocity rat­
ing must not exceed 300 ft/min for disposable filters. The air
velocity through permanent-type filters shall not exceed the
manufacturer’s recommendation.
d. Using appropriate fasteners for type of duct being
used, connect retum-air duct to furnace.
4. Install 24-x24-in. sheet metal shield on platform in
front of louvered control panel, as shown in Figure 8.
VII. CRAWL SPACE INSTALLATION
The 376B Furnace can be installed horizontally with either
the LH or RH side up. In a crawl space, the furnace can
either be hung from the floor joist or installed on suitable
blocks or pad. The furnace can be suspended from each cor­
ner by hanger bolts (Four each 3/8-in. all-thread rod) cut to
desired length, 1 x 3/8 flat washer, 3/8 lockwasher, and 3/8
nut. Dimples are provided for hole locations. See Figure 3.
NOTE: Use Type B1 vent in a concealed space.
The crawl space installation is very similar to the attic;
therefore, refer to Division VI, Section B, steps 1, 2, and 3.
The installation of a sheet metal shield in front of the lou­
vered control panel is covered in step 4. For a crawl space
installation, this same sheet metal shield must be installed
SEDIMENT TRAP'
A82178
Figure 8—Typical Attic Installation
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