18-CD32D1-3
7
Installer’s Guide
FURNACE
FRONT
A (width)
B (depth)
C
D
3
UPFLO
W
FURNA
CE
CASED
COIL
SCREWS
(BOTH SIDES)
STANDOFFS
(BOTH SIDES)
STANDOFFS (4)
DRILL SCREWS (4)
FOR VERTICAL
INSTALLATIONS:
1
2
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.
Drill screws are used to engage the furnace top flanges.
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. The above instructions
apply only if the coil is on top of an upflow furnace.
DOWNFLOW INSTALLATION
▲
WARNING
!
FIRE HAZARD
Do not install the furnace directly on carpeting, tile or
other combustible material other than wood flooring.
For vertical downflow application, subbase (BAY-
BASE205) 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. Failure to follow this warning could result
in property damage, personal injury or death.
REQUIRED FLOOR OPENING: (DOWNFLOW)
See Figure 3 and Table 1
TABLE 1
CABINET
WIDTH
RETURN
DUCT WIDTH
FLOOR OPENING PLENUM OPENING
"A"
"B"
"C"
"D"
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"
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.
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 Fig-
ure 4.
IMPORTANT:
The 2/4TXC cased coil must be placed downstream in the
supply air 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 fur-
nace
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 fur-
nace. 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.
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 posi-
tion). 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 and
Figure 5).
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 con-
nect the strapping (See Figure 7). Line contact is only per-
missible between lines formed by the intersection of the top
and two sides of the furnace casing and the building joists,
studs, or framing.
CASED COIL CONNECTION
BRACKET FOR DOWNFLOW FUR-
NACE IN HORIZONTAL
4
5
Typical Upflow/Horizontal Attic Installation
