Bottom Return Air Inlet; Suspended Furnace Support - Carrier 58ST Installation, Start-Up, Operating And Service And Maintenance Instructions

A
PLENUM
OPENING
B
OPENING
C
Fig. 11 --- Floor and Plenum Opening Dimensions
NOTE: It is recommended that the perforated supply- -air duct
flanges be completely folded over or removed from furnace when
installing the furnace on a factory- -supplied cased coil or coil box.
To remove the supply- -air duct flange, use wide duct pliers or
hand seamers to bend flange back and forth until it breaks off. Be
careful of sharp edges. (See Fig. 14.)
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
Fig. 12 --- Furnace, Plenum, and Subbase Installed on a
Combustible Floor
D
FLOOR
A96283
A96285
FURNACE
CD5 OR CK5
COIL ASSEMBLY
OR KCAKC
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
OPENING
Fig. 13 --- Furnace, Plenum, and Coil Assembly or Coil Box
Installed on a Combustible Floor

Bottom Return Air Inlet

These furnaces are shipped with bottom closure panel installed in
bottom return- -air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom
filler panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
HORIZONTAL INSTALLATION
WARNING
!
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control
operation will be adversely affected. Never connect
return- -air ducts to the back of the furnace.
The furnace can be installed horizontally in an attic or crawl
space on either the left- -hand (LH) or right- -hand (RH) side. The
furnace can be hung from floor joists, rafters or trusses or
installed on a non- -combustible platform, blocks, bricks or pad.

Suspended Furnace Support

The furnace may be supported under each end with threaded rod,
angle iron or metal plumber's strap as shown. (See Fig. 15 and
16.) Secure angle iron to bottom of furnace as shown.
Heavy- -gauge sheet metal straps (plumber's straps) may be used
to suspend the furnace from each bottom corner. To prevent
screws from pulling out, use 2 #8 x .- -in. screws into the side and
2 #8 x .- -in. screws in the bottom of the furnace casing for each
strap. (See Fig. 15 and 16.)
12
FLOOR
A04140
A04140