Bryant 345MAV instruction manual Installation Leveling Legs if Desired

SUPPLY	VENT THROUGH ROOF
AIR
	OR SIDEWALL

1 SQ IN.

DUCTSPER 4000

TOBTUH* OUTDOORS

			12″	MAX
					IN.
			1 SQ
			PER 1000
		CONFINED SPACE	BTUH* IN DOOR
			OR WALL
INTERIOR			UNCONFINED
			SPACE
	HEATED
	SPACE
			3″ MIN
			(FRONT)
			1 SQ IN.
			PER 1000
			BTUH* IN DOOR
			OR WALL

12″ MAX

1 SQ IN. PER 2000 BTUH*

DUCTS

TO

OUTDOORS

1 SQ IN. PER 2000 BTUH*

12″ MAX

			D				12″
		VENT					MAX
A	SUPPLY	THROUGH				F
	AIR	ROOF
		OR					1 SQ IN.
		SIDEWALL
							PER 4000
							BTUH*
			CONFINED SPACE				OUTDOORS
							1 SQ IN.
							PER 4000
							BTUH*
B				E		G
							12″
			C				MAX
				12″	MAX

12″ MAX

RETURN AIR

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

NOTE: Side clearance required as needed for combustion-air pipe and termination,

vent pipe, and gas and electrical connections.

A96185

RETURN AIR		DUCT
			1 SQ IN.
		TO
	OUTDOORS		PER 4000
*Minimum dimensions of 3-In.			BTUH*
NOTES: 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.

A96186

Fig. 12ÐConfined Space: Air for Combustion and

Ventilation from an Unconfined Space

For Example:

COMBUSTION AIR FROM OUTDOORS THROUGH

VERTICAL DUCTS

345MAV Furnace	Free Area per Opening	Round Pipe
Input Btuh	(Sq In.)	(In. Dia)
40,000	10.0	4
60,000	15.0	5
80,000	20.0	6
100,000	25.0	6
120,000	30.0	7

2.If combustion air is taken from outdoors through horizontal ducts, the openings and ducts MUST have at least 1 sq in. of free area per 2000 Btuh of the total input for all equipment within the confined space. (See Fig. 13.)

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.)

Ð14Ð

Fig. 13ÐConfined Space: Air for Combustion and

Ventilation from Outdoors

For Example:

COMBUSTION AIR FROM OUTDOORS THROUGH

HORIZONTAL DUCTS

345MAV Furnace	Free Area per Opening	Round Pipe
Input Btuh	(Sq In.)	(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

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.)