Caution, Installation – Bryant 355CAV User Manual

Page 18

″

(44mm)

(8mm)

(44mm)

(8mm)

(44mm)

A89014

Fig. 18 -- Leveling Legs

INSTALLATION

Leveling Legs (If Desired)

When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 18.) Install field--supplied,

corrosion--resistant 5/16--in. (8 mm) machine bolts and nuts.
NOTE: The maximum length of bolt should not exceed 1--1/2 in.
(38 mm).

1. Position furnace on its back. Locate and drill a 5/16--in. (8

mm) diameter hole in each bottom corner of furnace. (See

Fig. 18.) Holes in bottom closure panel may be used as
guide locations.

2. For each hole, install nut on bolt and then install bolt and

nut in hole. (Install flat washer if desired.)

3. Install another nut on other side of furnace base. (Install flat

washer if desired.)

4. Adjust outside nut to provide desired height, and tighten

inside nut to secure arrangement.

NOTE: Bottom closure must be used when leveling legs are used.
See Bottom Closure Panel section.

Installation in Upflow or Downflow Applications

NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when special base (available from
Manufacturer) Part No. KGB is used. Special base is not required
when this furnace is installed on Manufacturer’s Cased Coil
Assembly or when Manufacturer’s Coil Box is used.

1. Determine application being installed from Table 1.
2. Construct hole in floor per dimensions specified in Table 1

and Fig. 19.

3. Construct plenum to dimensions specified in Table 2 and

Fig. 19.

4. If special base (KGASB) is used, install as shown in Fig.

20.

5. If Manufacturer’s Cased Coil Assembly or Manufacturer’s

Coil Box is used, install as shown in Fig. 21.

NOTE: Remove furnace perforated discharge duct flanges when
they interfere with mating flanges on coil on downflow subbase.
To remove furnace perforated discharge duct flange, use hand
scanners, wide duct pliers or duct flange tool to bend flange back

and forth until it breaks off. Be careful of sharp edges. (See Fig.
22.)

UNIT MAY NOT OPERATE HAZARD
Failure to follow this caution may result in intermittent unit

operation or performance satisfaction.
Do not bend duct flanges inward as shown in Fig. 22. This

will affect airflow across heat exchangers and may cause

limit cycling or premature heat exchanger failure. Remove

duct flange completely or bend it inward a minimum of 210

degrees as shown in Fig. 22.

CAUTION

Installation in Horizontal Applications

These furnaces can be installed in either horizontal left or right

discharge position. In a crawlspace, furnace can either be hung
from floor joist or installed on suitable blocks or pad. Furnace can

be suspended from each corner by hanger bolts and angle iron

supports.

(See Fig. 23.)

Cut hanger bolts (4 each 3/8--in.

all--thread rod) to desired length. Use 1 X 3/8--in. flat washers,

3/8--in. lock washers, and 3/8--in. nuts on hanger rods as shown in
Fig. 23. Dimples are provided for hole locations. (See Fig. 2.)

UNIT MAY NOT OPERATE HAZARD
Failure to follow this caution may result in intermittent unit

operation or performance satisfaction.
The entire length of furnace MUST be supported when

furnace is used in a horizontal position to ensure proper

draining. When suspended, bottom brace supports sides

and center blower shelf. When unit is supported from the

ground, blocks or pad should support sides and center

blower shelf area.

CAUTION

PLENUM

OPENING

FLOOR

OPENING

A96283

Fig. 19 -- Floor and Plenum Opening Dimensions

355C