Trane *DC040C924 Installer'S Manual Download Page 6

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18-CD19D5-10

Installer’s Guide

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FURNACE

FRONT

A (width)

B (depth)

CASED COIL CONNECTION

BRACKET FOR DOWNFLOW

FURNACE IN HORIZONTAL

DOWNFLOW ONLY

UPFLO

FURNA

CASED

COIL

SCREWS

(BOTH SIDES)

STANDOFFS

(BOTH SIDES)

STANDOFFS (4)

DRILL SCREWS (4)

FOR VERTICAL

INSTALLATIONS:

UPFLOW/
HORIZONTAL
SHOWN

DOWNFLOW INSTALLATIONS

▲

WARNING

Do not install the furnace directly on carpeting, tile or other
combustible material other than wood flooring. For vertical
downflow application, subbase (BAYBASE205) must be used
between the furnace and combustible flooring. When the
downflow furnace is installed vertically with a cased coil, a
subbase is not required.

HORIZONTAL INSTALLATION

The coil and furnace must be fully supported when used in the
horizontal position. It is always recommended that an auxiliary
drain pan be installed under a horizontally installed evaporator
coil or 90% gas furnace. Connect the auxiliary drain line to a
separate drain line (no trap is needed in this line).

Three brackets (with screws) are included with downflow
furnaces for installation to stabilize and secure the furnace and
TXC cased coil in the horizontal position. See Figure 4. The
coil is placed downstream of the furnace, with the apex of the coil
pointing in the direction of the airflow for horizontal installa-
tion. The cased coil is secured to the furnace and both the
furnace and the cased coil must be properly supported. The
brackets mount using the rear screws on the coil case and use
the screws provided to secure the bracket to the furnace. The
remaining bracket is placed as close to center as possible
(horizontally) between the coil case front and the furnace bottom
channel (for downflow/horizontal furnace). Use four of the
screws provided to secure the bracket. The upflow furnace,
converted to horizontal, aligns and attaches the TXC coil as in
Figure 1. However, the coil requires additional support.

TABLE 1

CABINET

WIDTH

RETURN

DUCT WIDTH

FLOOR OPENING PLENUM OPENING

"A"

"B"

"C"

"D"

14-1/2"

13-1/4"

13-5/8"

20-1/8"

12-5/8"

19-3/8"

17-1/2"

16-1/4"

16-5/8"

20-1/8"

15-5/8"

19-3/8"

21"

19-3/4"

20-1/8"

19-1/8"

19-3/8"

24-1/2"

23-1/4"

23-5/8"

20-1/8"

22-5/8"

19-3/8"

Required floor opening: (DOWNFLOW)

See Figure 3 and Table 1

The furnace may be installed in an attic or crawl space in the
horizontal position by placing the furnace on the left side (as
viewed from the front in the vertical position). The horizontal
furnace installation in an attic should be on a service platform
large enough to allow for proper clearances on all sides and
service access to the front of the furnace (See Outline Drawings).
Line contact is only permissible between lines formed by
intersections of the top and two sides of the furnace casing and
building joists, studs, or framing.

The furnace may be placed horizontally in a crawl space on a pad
or other noncombustible material which will raise the unit for
sufficient protection from moisture. The furnace must be
supported at both ends and the middle when installed
horizontally. The furnace must also be elevated approxi-
mately 4-6 inches to allow clearance for the condensate
drain to exit the cabinet in the horizontal position.

The horizontal furnace may also be suspended from the joists
using 3/8" all-thread rods with pieces of angle iron underneath
the furnace to form a hanging rack at both ends and the mid-
point. The rods need to be of sufficient length to allow for proper
clearances from combustible materials. The angle iron needs to
be at least 32" in length to allow for access to service panels.

The upflow furnace, converted to horizontal, aligns and attaches
the TXC coil to the same flanges used in vertical. The coil needs
to have additional support.