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18-CD19D7-22

Installer’s Guide

UPFLOW INSTALLATION

Standoffs and screws (See Figure 1) are included with the
cased coils for attachment to the furnace. There are clear-
ance alignment holes near the bottom of the coil wrapper and
drill screws are used to engage the furnace top flange. The
standoff is inserted into the cabinet alignment hole. The drill
screws are inserted through the standoffs then screwed into
the furnace flange. The coil is always placed downstream of
the furnace airflow. These instructions apply only if the coil
is on top of an upflow furnace.

DOWNFLOW INSTALLATION

▲

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.

REQUIRED FLOOR OPENING: (DOWNFLOW)

See Figure 2 and Table 1

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"

HORIZONTAL INSTALLATION

The coil and furnace must be fully supported when used in the
horizontal position.

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.

IMPORTANT:
The 2/4TXC cased coil must be placed downstream of the
furnace. In horizontal installations, the apex of the coil
may point either toward or away from the furnace. See
the 2/4TXC coil Installer's Guide for more details.

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

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FURNACE

FRONT

A (width)

B (depth)

UPFLO

FURNA

CASED

COIL

SCREWS

(BOTH SIDES)

STANDOFFS

(BOTH SIDES)

STANDOFFS (4)

DRILL SCREWS (4)

FOR VERTICAL

INSTALLATIONS

CASED COIL CONNECTION

BRACKET FOR DOWNFLOW

FURNACE IN HORIZONTAL

DOWNFLOW ONLY

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.

This furnace may be installed in an attic or crawl space in the
horizontal position by placing the furnace on the left or right
side (as viewed from the front in the upright 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
Clearance Table on Outline Drawings, pages 4&5, and
Figure 5 below).

If the furnace is suspended using perforated steel strap
(plumber’s strap), it must be supported at all four corners
and in the middle at the front of the furnace. The forward
most screw on the side of the furnace may be used to connect
the strapping (See Figure 6 on page 7).

TYPICAL ATTIC PLATFORM INSTALLATION

(UPFLOW/HORIZONTAL FURNACE SHOWN)