312A

equipped with means to prevent operation of either unit unless the damper is in the full-heat or full-cool position.

AIR FOR COMBUSTION AND

VENTILATION

Provisions for adequate combustion, ventilation, and dilution air must be provided in accordance with:

U.S. installations: Section 8.3 of the NFGC, Air for Combustion and Ventilation, and applicable provisions of the local building codes.

Canadian installations: Part 8 of the CAN/CSA-B149.1-05, Venting Systems and Air Supply for Appliances and all authorities having jurisdiction.

!CAUTION

FURNACE CORROSION HAZARD

Failure to follow this caution may result in furnace damage.

Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements can corrode heat exchangers and shorten furnace life. Air contaminants are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air fresheners, and other household products.

!WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in personal injury or death.

The operation of exhaust fans, kitchen ventilation fans, clothes dryers, attic exhaust fans or fireplaces could create a NEGATIVE PRESSURE CONDITION at the furnace. Make-up air MUST be provided for the ventilation devices, in addition to that required by the furnace. Refer to Carbon Monoxide Poisoning Hazard warning in venting section of these instructions to determine if an adequate amount of make-up air is available.

The requirements for combustion and ventilation air depend upon whether or not the furnace is located in a space having a volume of at least 50 cubic feet per 1,000 Btuh input rating for all gas appliances installed in the space.

SSpaces having less than 50 cubic feet per 1,000 Btuh require the Outdoor Combustion Air Method.

SSpaces having at least 50 cubic feet per 1,000 Btuh may use the Indoor Combustion Air, Standard or Known Air Infiltration Method.

Outdoor Combustion Air Method

1.Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent horihorizontal or vertical duct(s) or opening(s) directly communicating with the outdoors or spaces that freely communicate with the outdoors.

2.Fig. 7 illustrates how to provide TWO OUTDOOR OPENINGS, one inlet and one outlet combustion and ventilation air opening, to the outdoors.

a.One opening MUST commence within 12 in. (300 mm) of the ceiling and the second opening MUST commence within 12 in. (300 mm) of the floor.

b.Size openings and ducts per Fig. 7 and Table 2.

c.TWO HORIZONTAL DUCTS require 1 square inch of free area per 2,000 Btuh (1,100 mm2/kW) of combined input for all gas appliances in the space per Fig. 7 and Table 2.

d.TWO OPENINGS OR VERTICAL DUCTS require 1 square inch of free area per 4,000 Btuh (550 mm2/kW) for combined input of all gas appliances in the space per Fig. 7 and Table 2.

3.ONE OUTDOOR OPENING requires:

a.1 square inch of free area per 3,000 Btuh (734 mm2/kW) for combined input of all gas appliances in the space per Table 2 and

b.Not less than the sum of the areas of all vent connectors in the space.

Table 2 – Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors

 

 

TWO HORIZONTAL DUCTS

 

SINGLE DUCT OR OPENING

TWO OPENINGS OR VERTICAL

 

 

 

DUCTS

 

 

 

 

 

 

 

 

 

 

 

FURNACE

 

(1 SQ. IN./2,000 BTUH)

 

(1 SQ. IN./3,000 BTUH)

(1 SQ. IN./4,000 BTUH)

INPUT

 

(1,100 SQ. MM/KW)

 

 

(734 SQ. MM/KW)

(550 SQ. MM/KW)

(BTUH)

 

 

 

 

 

 

 

 

 

 

 

 

Free Area of

Round Duct

Free Area of

 

Round Duct

Free Area of

 

Round Duct

 

Opening and Duct

Opening and Duct

Opening and Duct

 

 

(in. Dia)

 

(in. Dia)

 

(In. Dia)

 

 

(Sq. In.)

 

(sq. In.)

 

(Sq. In.)

 

 

 

 

 

 

 

 

 

 

44,000

 

22

 

6

 

14.7

 

5

11

 

4

66,000

 

33

 

7

 

22

 

6

16.5

 

5

88,000

 

44

 

8

 

29.3

 

7

22

 

6

110,000

 

55

 

9

 

36.7

 

7

27.5

 

6

132,000

 

66

 

10

 

44

 

8

33

 

7

154,000

 

77

 

10

 

51.3

 

9

38.5

 

8

FURNACE

 

WATER HEATER

 

 

TOTAL INPUT

 

 

 

 

 

110,000

+

30,000

=

(140,000 divided by 4,000)

=

35.0 Sq. In. for each two Vertical Ducts or Openings

66,000

+

40,000

=

(106,000 divided by 3,000)

=

35.3 Sq. In. for a Single Duct or Opening

88,000

+

30,000

=

(118,000 divided by 2,000)

=

59.0 Sq. In. for each of two Horizontal Ducts

8

Page 8
Image 8
Bryant 120 instruction manual AIR for Combustion Ventilation, Furnace Corrosion Hazard, Carbon Monoxide Poisoning Hazard

120 specifications

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