Installation; Leveling Legs (If Desired); Installation In Upflow And Downflow Applications; Installation In Horizontal Applications - Bryant 352AAV Installation, Start-Up, And Operating Instructions Manual

must not be smaller than 1/4-in. (6 mm) mesh. Louvers and
grilles must be constructed so they cannot be closed.
When combustion air ducts are used, they must be of the same
cross sectional area as the free area of the openings to which they
connect. The minimum dimension of ducts must not be less than
3 in. (76 mm).
Combination of Indoor and Outdoor Air
1. Indoor openings shall
Combustion Air Method below and,
2. Outdoor openings shall be located as required in
the Outdoor Combustion
previously and,
3. Outdoor openings shall be sized as follows:
a. Calculate the Ratio of all Indoor Space volume divided
by required volume for Indoor Combustion Air
Method below.
b. Outdoor opening size reduction Factor is 1 minus the
Ratio in a. above.
c. Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method above
multiplied by reduction Factor in b. above. The
minimum dimension of air openings shall be not less
than 3 in. (76 mm).

INSTALLATION

Step 1 - - Leveling Legs (If Desired)
When furnace is used in upflow position with side inlet(s),
leveling legs may be desired. (See Fig. 20.) 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
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. 20.) 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.
Step 2 - - Installation in Upflow and Downflow
Applications
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when special base (available from
manufacturer) Part No. KGASB0201ALL is used. Special base is
not required when this furnace is installed on manufacturer's Coil
Assembly Part No. CD5 or CK5, or Coil Box Part No. KCAKC
is used.
1. Determine application being installed from Table 3.
2. Construct hole in floor per dimensions specified in Table 3
and Fig. 21.
3. Construct plenum to dimensions specified in Table 3
and Fig. 21.
4. If downflow subbase (KGASB) is used, install as shown in
Fig. 22. If Coil Assembly Part No. CD5 or CK5 or Coil
Box Part No. KCAKC is used, install as shown in Fig. 23.
NOTE: Remove furnace perforated, supply-air duct flanges
when they interfere with mating flanges on coil or downflow
subbase. To remove perforated, supply-air duct flanges, use wide
duct pliers, duct flange tool, or hand seamers to bend flange back
and forth until it breaks off. Be careful of sharp edges.
(See Fig. 24.)
Indoor
comply with the
Air Method mentioned
5/ 16
"
(8mm)
1 3 /
"
4
(44mm)
(8mm)
5
/
"
16
(44mm)
(44mm)
Fig. 20 - - Leveling Legs
CAUTION
!
UNIT MAY NOT OPERATE
Failure to follow this caution may result in intermittent unit
operation or performance satisfaction.
Do not bend duct flanges inward as shown in Fig. 21. 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° as
shown in Fig. 24.
Step 3 - - Installation in Horizontal Applications
These furnaces can be installed horizontally in either horizontal left
or right discharge position. In a crawlspace, the 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. 25.) Cut hanger bolts (4 each 3/8-in.
(10 mm) 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. 25. Dimples are provided for hole locations. (See
Fig. 2.)
CAUTION
!
UNIT MAY NOT OPERATE
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.
Step 4 - - Air Ducts

GENERAL REQUIREMENTS

The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA)
or American Society of Heating, Refrigerating and Air
Conditioning Engineers (ASHRAE), or consult The Air Systems
Design Guidelines reference tables available from your local
distributor. The duct system should be sized to handle the
required system design CFM at the design static pressure.
21
(8mm)
5/ 16
"
1 3 /
"
4
(44mm)
(8mm)
5/ 16
"
1 3/ 4
"
3/ 4
1
"
A89014