Carrier 58PAV - Manual (Page 4)

SUPPLY
AIR
For Example:
VENT THROUGH ROOF
(CATEGORY I) OR WALL
(CATEGORY III)
I I I
I I I
I I I
~r
12 MAX
i
1 so IN.
Ш PER 1000
BTUH*
INTERIOR
HEATED
SPACE
6 IN. MIN
(FRONT) t
1 SO IN.
PER 1000
BTUH*
TI
i 1
RETURN AIR^---
12 MAX
* Minimum opening size is 100 square in. with
minimum dimensions of 3 in.
1 Minimum of 3 in. when type-B vent is used.
A89012
Fig. 2—Air For Combustion and Ventilation
(Inside Air)
c. If the furnace is installed on a raised platform to provide a
return-air plenum, and return air is taken directly from the
hallway or space adjacent to the furnace, all air for
combustion must come from outdoors.
2. All air from outside the structure:
a. If combustion air is taken from outdoors through vertical
ducts, the openings and ducts MUST have at least 1 sq in.
of free area per 4000 Btuh of the total input for all
equipment within the confined space. (See Fig. 3.)
For Example:
58PAV FURNACE
INPUT BTUH
FREE AREA PER OPENING
(SQ IN.)
ROUND PIPE
(IN. DIA)
44,000 11.0 4
66,000 16.5 5
88,000 22.0 6
110,000 27.5 6
132,000 33.0 7
154,000 38.5 7
b. If combustion air is taken from the outdoors through
horizontal ducts, the openings and ducts MUST have at
least 1 sq in. of free area per 2000 Btuh of the total input
for all equipment within the confined space.
58PAV FURNACE
INPUT BTUH
FREE AREA PER OPENING
(SQ IN.)
ROUND PIPE
(IN. DIA)
44,000 22.0 6
66,000 33.0 7
88,000 44.0 8
110,000 55.0 9
132,000 66.0 10
154,000 77.0 10
When 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 rectangular ducts must not be less than 3
in. (See Fig. 3.)
A WARNING
Do not install the furnace on its back as safety control
operation are adversely affected. Never connect return-air
ducts to the back of the furnace. Failure to follow this warning
can cause a fire, personal injury, or death.
Step 3—Filter Arrangement
The factory-supplied filter(s) is shipped in the blower compart­
ment. Determine location for the filter and move filter retaining
hardware, if necessary, before attaching the return-air duct. After
the return-air duct has been connected to the furnace, install the
filter(s) inside the furnace blower compartment. See Fig. 4 for side
return application and Fig. 5 for bottom return application.
COMBINATIONS OF OPENINGS:
A&B C&D D&E
A89013
Fig. 3—Air For Combustion and Ventilation
(Outside Air)