Carrier 58CTA/CTX User Manual download pdf (Page 8)

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 9.3 of the NFPA 54 /A ANSI

Z223.1--2006, 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.

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.

CAUTION

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.

WARNING

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.

S Spaces having less than 50 cubic feet per 1,000 Btuh require the

Outdoor Combustion Air Method.

S Spaces 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 combus-

tion, ventilation, and dilution of flue gases using perman-

ent horizontal 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. TWOHORIZONTAL DUCTS require1 --in

of free area

per 2,000 Btuh (1,100 mm

/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

-- i n

of free area per 4,000 Btuh (550 mm

/kW) for com-

bined input of all gas appliances in the space per Fig. 7

and Table 2.

3. ONE OUTDOOR OPENING requires:

a. One square inch of free area per 3,000 Btuh (734

/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 of Duct to Outdoors

FURNACE

INPUT

(BTUH)

TWO HORIZONTAL DUCTS SINGLE DUCT OR OPENING TWO OPENINGS OR VERTICAL DUCTS

(1 SQ. IN./2,000 BTUH) (1,100 SQ. MM/K W) (1 SQ. IN./3,000 BTUH) (734 SQ. MM/KW) (1 SQ. IN./4,000 BTUH) (550 SQ. MM/KW)

Free Area of Opening

and Duct

Sq. In. (Sq. mm)

Round Duct

Dia.

In. (mm)

Free Area of Opening

and Duct

Sq. In. (Sq. mm)

Round Duct

Dia.

In. (mm)

Free Area of Opening

and Duct

Sq. In. (Sq. mm)

Round Duct

Dia.

In. (mm)

44,000 22 (14194) 6 (152) 14.7 (9484) 5 (127) 11 (7096) 4 (102)

66,000 33 (21290) 7 (178) 22 (14193) 6 (152) 16.5 (10645) 5 (127)

88,000 44 (28387) 8 (203) 29.3 (18903) 7 (178) 22 (14193) 6 (152)

110,000 55 (35484) 9 (229) 36.7 (23677) 7 (178) 27.5 (17742) 6 (152)

132,000 66 (42580) 10 (254) 44 (28387) 8 (203) 33 (21290) 7 (178)

154,000 77 (49677) 10 (254) 51.3 (33096) 9 (229) 38.5 (24839) 8 (203)

EXAMPLES: Determining Free Area

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

58CT

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Carrier 58CTA/CTX User Manual Page 8

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