Carrier 58PAV - Manual (Page 4)

total input for all equipment within the confined space.
For Example:
58PAV Furnace
Input Btuh
Free Area per Opening
(square ins.)
Round Pipe
(ins. 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 sec­
tional area as the free area of the openings to which they
connect. The minimum dimension of rectangular ducts must
not be less than 3-ins. See Fig. 3.
A WARNING
Do not install the furnace on its back; safety control
operation will be adversely affected. Never connect
return-air ducts to the back of the furnace. A failure to
follow this warning can cause a fire, personal injury, or
death.
III. FILTER ARRANGEMENT
The factory-supphed filter(s) is shipped in the blower com­
partment. Deterrnine 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 apphcation and Fig.
5 for bottom return application.
A bottom closure panel is factory-installed in the bottom of
the furnace. When bottom return inlet is desired, remove
and discard the enclosure panel.
Filter retaining brackets, supports, and retainers are fac­
tory assembled and shipped installed for side return appUca-
tion, with one set of all required hardware provided. See Fig.
4.
For bottom return appHcations, remove the brackets
(front and back) and supports from each side. The back
bracket(s) are installed in the rear of the furnace casing
(dimples are provided to mark mounting screw locations).
The front bracket(s) are installed on the bottom front plate
as shown in Fig. 5, once the bottom enclosure has been
removed. Rotate filter supports 180 degrees so filter will
rest on support emd reinstall. (Do not reinstall in 17-1/2-in.
casing.) Install the filter retaining rod (small U-shaped end)
in the rear bracket, and the front of the filter retainer rod as
shown in Fig. 5. Two sets of hardware are needed for fur­
naces in 24-1/2-in. casings using one filter for bottom return.
All hardware is provided for filter installation.
A WARNING
Never operate unit without a filter or with filter access
door removed. A failure to follow this warning can
cause a fire, personal injury, or death.
Table 3—Filter Information
Furnace Fiiter Size* Fiiter
Casing Width Side Return Bottom Return Type
14-3/16 (1)16x25x1 (1)14x25x1t Cleanable
17-1/2 (1)16x25x1 (1)16x25x1t Cleanable
21 (1)16x25x1 (1)20 x 25x1t Cleanable
24-1/2 (2)16x25x1 (1)24 x 25x1t Cleanable
*Filter can be field-modified by cutting to the desired size. Aiternate sizes
can be ordered from your Distributor or Deaier.
fFactory provided with the furnace.
Fig. 4—Side Filter Arrangement
Fig. 5—Bottom Filter Arrangement
IV. LEVELING LEGS (If Required)
When the furnace is used with side inlet(s), and leveling legs
are required, refer to Fig. 6, and install field-supplied
corrosion-resistant 5/16-in. machine bolts and nuts.
NOTE; The maximum length of the bolt should not exceed
1-1/2 ins.
1. Lay furnace on its back, locate and drill 5/16-in. diame­
ter hole in each bottom corner of furnace as shown in
Fig. 6.
2. Install nut on bolt and install bolt and nut in hole.
(Install flat washer if desired.)