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Carrier WEATHERMAKER 8000 58ZAV User Manual

Page 6

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Step 3—Supply Air Connections
DOWNFLOW FURNACES
Connect supply-air duct to supply-air opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace
supply/outlet or air conditioning coil casing (when used), when
installed on non-combustible material. When installed on combus-
tible material, supply-air duct attachment must ONLY be con-
nected to an accessory subbase or factory approved air condition-
ing coil casing. DO NOT cut main furnace casing to attach supply
side air duct, humidifier, or other accessories. All accessories
MUST be connected external to furnace main casing.
HORIZONTAL FURNACES
Connect supply-air duct to supply air opening on furnace. The
supply-air duct attachment must ONLY be connected to furnace

supply/outlet or air conditioning coil casing (when used). DO NOT
cut main furnace casing to attach supply side air duct, humidifier,
or other accessories. All accessories MUST be connected external
to furnace main casing.
Step 4—Return Air Connections
The return-air duct must be connected to return-air opening
provided as shown in Fig. 1. DO NOT cut into casing sides or back
to attach any portion of return-air duct. Bypass humidifier connec-
tions should be made at ductwork or coil casing sides exterior to
furnace.

Fig. 3—Confined Space: Air for Combustion and

Ventilation from an Unconfined Indoor Space

A93387

RETURN

AIR

6″ MIN

(FRONT)

SUPPLY AIR

VENT THROUGH ROOF

(CATEGORY I)

1 SQ IN.

PER 1000

BTUH* IN DOOR

OR WALL

12″ MAX

1 SQ IN.

PER 1000

BTUH* IN DOOR

OR WALL

12″ MAX

INTERIOR

HEATED

SPACE

* Minimum opening size is 100 sq in. with

minimum dimensions of 3 in.

Minimum of 3 in. when type B-1 vent is used.

UNCONFINED

SPACE

Fig. 4—Confined Space: Air for Combustion and

Ventilation from Outdoors

A93388

DUCTS TO

OUTDOORS

1 SQ IN.

PER 4000

BTUH

*

RETURN

AIR

VENT

THROUGH

ROOF

(CATEGORY I)

D

B

A

C

E

1 SQ IN.

PER 4000

BTUH

DUCT

TO

OUTDOORS

SUPPLY AIR

1 SQ IN.

PER 2000

BTUH*

DUCTS

TO

OUTSIDE

12″ MAX

12″ MAX

CONFINED

SPACE

12″

MAX

12″

MAX

1 SQ IN.

PER 4000

BTUH

*

OUTDOORS

1 SQ IN.

PER 4000

BTUH

*

1 SQ IN.

PER 2000

BTUH*

12″ MAX

Use any of the following

combinations of openings:

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

NOTE:

*Minimum dimensions of 3 in.

F

G

Table 2—Minimum Free Area Of Combustion Air Opening

58ZAV

FURNACE

INPUT

(BTUH)

AIR FROM UNCON-

FINED INDOOR

SPACE

OUTDOOR AIR THROUGH

VERTICAL DUCTS

OUTDOOR AIR THROUGH

HORIZONTAL DUCTS

OUTDOOR AIR THROUGH

SINGLE DUCT

Free Area

of Opening

(Sq In.)

Free Area of

Opening and Duct

(Sq In.)

Round

Pipe

(In. Dia)

Free Area of

Opening and Duct

(Sq In.)

Round

Pipe

(In. Dia)

Free Area of

Opening and Duct

(Sq In.)

Round

Pipe

(In. Dia)

46,000

100

11.50

4

23.0

6

15.33

5

69,000

100

17.25

5

34.5

7

23.00

6

92,000

100

23.00

6

46.0

8

30.67

7

115,000

115

28.75

7

57.5

9

38.33

7

135,000

135

33.75

7

67.5

10

45.00

8

* Free area shall be equal to or greater than the sum of the areas of all vent connectors in the confined space. Opening area must be increased if other gas appliances

in the space require combustion air.

6