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Bryant 345MAV User Manual

Page 14

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3. When 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. (See Fig. 13.)

INSTALLATION

I.

LEVELING LEGS (IF DESIRED)

When furnace is used in upflow position with side inlet(s), leveling
legs may be desired. (See Fig. 14.) Install field-supplied,
corrosion-resistant 5/16-in. 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.

diameter hole in each bottom corner of furnace. (See Fig.
14.) 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.

Fig. 12—Confined Space: Air for Combustion and

Ventilation from an Unconfined Space

A96185

SUPPLY

AIR

3

MIN

(FRONT)

RETURN AIR

VENT THROUGH ROOF

OR SIDEWALL

1 SQ IN.
PER 1000
BTUH* IN DOOR

OR WALL

12

MAX

1 SQ IN.
PER 1000
BTUH* IN DOOR

OR WALL

12

MAX

INTERIOR

HEATED

SPACE

* Minimum opening size is 100 sq. in. with
minimum dimensions of 3-In.

NOTE:

UNCONFINED
SPACE

CONFINED

SPACE

Side clearance required as needed for
combustion-air pipe and termination,
vent pipe, and gas and electrical connections.

Fig. 13—Confined Space: Air for Combustion and

Ventilation from Outdoors

A96186

DUCTS

TO

OUTDOORS

1 SQ IN.
PER 4000
BTUH*

SUPPLY

AIR

VENT
THROUGH
ROOF

D

B

A

C

E

1 SQ IN.
PER 4000
BTUH*

DUCT

TO

OUTDOORS

RETURN AIR

1 SQ IN.
PER 2000
BTUH*

1 SQ IN.
PER 2000
BTUH*

DUCTS

TO

OUTDOORS

12

MAX

12

MAX

12

MAX

1. Use any of the following
combinations of openings:
A & B C & D D & E F & G

2. Side clearance required as needed for
combustion-air pipe and termination,
vent pipe, and gas and electrical connections.

NOTES:

*Minimum dimensions of 3-In.

CONFINED

SPACE

12

MAX

12

MAX

OUTDOORS

1 SQ IN.
PER 4000
BTUH*

F

G

1 SQ IN.
PER 4000
BTUH*

OR
SIDEWALL

For Example:

COMBUSTION AIR FROM OUTDOORS THROUGH

HORIZONTAL DUCTS

345MAV Furnace

Input Btuh

Free Area per Opening

(Sq In.)

Round Pipe

(In. Dia)

40,000

20.0

6

60,000

30.0

7

80,000

40.0

8

100,000

50.0

8

120,000

60.0

9

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