Carrier 58TN0B - Page 10

58TN0B/58TN1B: Installation, Start–Up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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4. If downflow subbase is used, install as show in Fig. 12. If
manufacturer’s cased evaporator coil or coil casing is used, install
as shown in Fig. 13.
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. Refer
to Duct Flanges (Fig. 18) in the “Air Ducts” section.
A96283
Fig. 11 – Floor and Plenum Opening Dimensions
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, Fig. 9.
2. Rotate bottom filler panel downward to release holding tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
A96285
Fig. 12 – Furnace, Plenum, and Subbase Installed on a Combustible
Floor
A08556
Fig. 13 – Furnace, Plenum, and Coil Assembly or Coil Box Installed
on a Combustible Floor
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
APPROVED
COIL ASSEMBLY
OR
COIL BOX
FURNACE
SHEET METAL
PLENUM
FLOOR
OPENING
COMBUSTIBLE
FLOORING
Table 4 – Opening Dimensions - In. (mm)
FURNACE
CASING WIDTH
IN. (mm)
APPLICATION
PLENUM OPENING FLOOR OPENING
A B C D
14–3/16
(360)
Upflow Applications on Combustible or Noncombustible
Flooring (subbase not required)
12-11/16
(322)
21-5/8
(549)
13-5/16
(338)
22-1/4
(565)
Downflow Applications on Noncombustible Flooring
(subbase not required)
12-9/16
(319)
19
(483)
13-3/16
(335)
19-5/8
(498)
Downflow applications on Combustible Flooring
(subbase required)
11-13/16
(300)
19
(483)
13-7/16
(341)
20-5/8
(524)
Downflow Applications on Combustible Flooring with coil assembly or
coil box (subbase not required)
12-5/16
(313)
19
(483)
13-5/16
(338)
20
(508)
17–1/2
(445)
Upflow Applications on Combustible or Noncombustible
Flooring (subbase not required)
16
(406)
21-5/8
(549)
16-5/8
(422)
22-1/4
(565)
Downflow Applications on Noncombustible Flooring
(subbase not required)
15-7/8
(403)
19
(483)
16-1/2
(419)
19-5/8
(498)
Downflow Applications on Combustible Flooring
(subbase required)
15-1/8
(384)
19
(483)
16-3/4
(425)
20-5/8
(524)
Downflow Applications on Combustible Flooring with coil assembly or
coil box (subbase not required)
15-1/2
(394)
19
(483)
16-1/2
(419)
20
(508)