Bryant 4-WAY MULTIPOISE TWO-STAGE CONDENSING GAS FURNACE 352AAV Instrukcje Operacyjne Pobierz pdf (Strona 20)

1 SQ IN .

PER

4000

BTUH*

DUCTS

O UTDOORS

1 SQ IN.

PER 4000

BTUH*

C IRCULA TING

AIR DUCTS

VENT

THR OUGH

R OOF

1 SQ IN.

PER 4000

BTUH*

DUCT

OUTDOORS

CIRCULA TING AIR DUCT S

1 SQ IN.

PER 2000

BTUH*

1 SQ IN.

PER 2000

BTUH*

DUCT S

OUTDOORS

12 ″ MAX

12 ″

MAX

12 ″

MAX

OUTDOORS

1 SQ IN .

PER

4000

BTUH*

CLEARANCE IN FRONT

OF COMB USTION AIR

OPENINGS SHALL BE

AT LEAST 3 IN .

(305mm)

(76mm)

*Minimum dimensions of 3 in. (76 mm).

Use any of the following combinations of openings:

A&BC&DD&EF&G

A03174

Fig. 18 -- Air for Combustion, Ventilation, and Dilution for

Outdoors

1. For other than fan-assisted appliances, such as a draft

hood-equipped water heater:

A04002

2. For fan-assisted appliances such as this furnace:

A04003

If:

Iother=combined input of all other than fan-assisted

appliances in Btu/hr

fan= combined input of all fan-assisted appliances in Btu/hr

ACH = air changes per hour (ACH shall not exceed 0.60.)

The following requirements apply to the Standard Method and to

the Known Air Infiltration Rate Method.

1. Adjoining rooms can be considered part of a space if:

a. There are no closable doors between rooms.

b. Combining spaces on same floor level. Each opening

shall have free area of at least 1 in.

/1,000 Btuh

(2,000 mm

/kW) of the total input rating of all gas

appliances in the space, but not less than 100 in.

(0.06 m

). One opening shall commence within 12 in.

(305 mm) of the ceiling and the second opening shall

commence within 12 in. (305 mm) of the floor. The

minimum dimension of air openings shall be at least

3 in. (76 mm). (See Fig. 19.)

CIRCULATING AIR

DUCTS

6" MIN

(FRONT)

CIRCULATING AIR DUCTS

VENT THROUGH ROOF

1 SQ IN.

PER 1000

BTUH* IN DOOR

OR WALL

12" MAX

1 SQ IN.

PER 1000

BTUH* IN DOOR

OR WALL

12" MA X

UNCONFINED

SPACE

INTERIOR

HEATED

SPACE

CLEARANCE IN FRONT OF COMBUSTION AIR

OPENINGS SHALL BE AT LEAST 3 IN.

(305mm)

(152mm)

(305mm)

* Minimum opening size is 100 sq in. (64516 mm

) with minimum dimensions of 3

in. (76 mm)

† Minimum of 3 in. (76 mm) when type-B1 vent is used.

A03175

Fig. 19 -- Air for Combustion, Ventilation, and Dilution from

Indoors

c. Combining space on different floor levels. The

volumes of spaces on different floor levels shall be

considered as communicating spaces if connected by

one or more permanent openings in doors or floors

having free area of at least 2 in.

/1,000 Btuh

(4,400 mm

/kW) of total input rating of all

gas appliances.

2. An attic or crawlspace may be considered a space that

freely communicates with the outdoors provided there are

adequate permanent ventilation openings directly to

outdoors having free area of at least 1-in.

/4,000 Btuh of

total input rating for all gas appliances in the space.

3. In spaces that use the Indoor Combustion Air Method,

infiltration should be adequate to provide air for

combustion, permanent ventilation and dilution of flue

gases. However, in buildings with unusually tight

construction, additional air MUST be provided using the

methods described in the Outdoor Combustion Air

Method section.

Unusually tight construction is defined as

Construction with:

a. Walls and ceilings exposed to the outdoors have a

continuous, sealed vapor barrier. Openings are

gasketed or sealed and

b. Doors and openable windows are weatherstripped and

c. Other openings are caulked or sealed. These include

joints around window and door frames, between sole

plates and floors, between wall-ceiling joints, between

wall panels, at penetrations for plumbing, electrical

and gas lines, etc.

NOTE: In determining the free area of an opening, the blocking

effect of the louvers, grilles, and screens must be considered. If

the free area of a louver or grille design is unknown, it may be

assumed that wood louvers have a 20 percent free area, and metal

louvers or grilles have a 60 percent free area. Screens, when used,

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