Carrier Condensing gas furnace Operations Instructions download pdf (Page 19)

When combustion air 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. (80mm).

Combination of Indoor and Outdoor Air

1. Indoor openings shall compy with the Indoor Combustion

Air Method below and,

2. Outdoor openings shall be located as required in the Outdoor

Combustion Air Method mentioned previously and,

3. Outdoor openings shall be sized as follows:

a. Calculate the Ratio of all Indoor Space volume divided by

required volume for Indoor Combustion Air Method

below.

b. Outdoor opening size reduction Factor is 1 minus the

Ratio in a. above.

c. Minimum size of Outdoor openings shall be the size

required in Outdoor Combustion Air Method above

multiplied by reduction Factor in b. above. The minimum

dimension of air openings shall be not less than 3 in. (80

mm).

INSTALLATION

Step 1—Leveling Legs (If Desired)

When furnace is used in upflow position with side inlet(s), leveling

legs may be desired. (See Fig. 21.) 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. 21.)

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.)

Fig. 19—Air for Combustion, Ventilation, and Dilution

for Outdoors

A03174

1 SQ IN.

PER

4000

BTUH*

DUCTS

OUTDOORS

1 SQ IN.

PER 4000

BTUH*

CIRCULATING

AIR DUCTS

VENT

THROUGH

ROOF

1 SQ IN.

PER 4000

BTUH*

DUCT

OUTDOORS

CIRCULATING AIR DUCTS

1 SQ IN.

PER 2000

BTUH*

1 SQ IN.

PER 2000

BTUH*

DUCTS

OUTDOORS

12″ MAX

Use any of the following

combinations of openings:

A & B C & D D & E F & G

NOTE:

*Minimum dimensions of 3 in.

12″

MAX

12″

MAX

OUTDOORS

1 SQ IN.

PER

4000

BTUH*

CLEARANCE IN FRONT

OF COMBUSTION AIR

OPENINGS SHALL BE

AT LEAST 3 IN.

→ Fig. 20—Air for Combustion, Ventilation, and Di-

lution from Indoors

A03175

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" MAX

* Minimum opening size is 100 sq in. with

minimum dimensions of 3 in.

†

Minimum of 3 in. . when type-B1 vent is used.

UNCONFINED

SPACE

INTERIOR

HEATED

SPACE

CLEARANCE IN FRONT OF COMBUSTION AIR

OPENINGS SHALL BE AT LEAST 3 IN.

Fig. 21—Leveling Legs

A89014

⁄4″

⁄16″

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Carrier Condensing gas furnace Operations Instructions Page 19

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