American Standard CDX1B040A9241A Installation, Operation And Maintenance Manual Download Page 6

Page: 6 / 54

Installation Instructions

Pub. No. 41-5016-12

Page 6

The downflow 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 sup-

ported at both ends and the middle when installed horizon-
tally. The furnace must also be elevated approximately
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 midpoint. 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.

UPFLOW INSTALLATION

Standoffs and screws (See Figure 1) are included with the cased
coils for attachment to the furnace. There are clearance 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
only apply if the coil is on top of an upflow furnace.

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).

MPORTANT:
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 remaining bracket is
placed as close to center as possible (horizontally) between the coil
case front and the furnace bottom channel (for downflow/horizon-
tal furnace). Use four of the screws provided to secure the bracket.

CASED COIL CONNECTION

BRACKET FOR DOWNFLOW

FIGURE 4

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 (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.

UPFLO

FURNA

CASED

COIL

SCREWS

(BOTH SIDES)

STANDOFFS

(BOTH SIDES)

FOR VERTICAL

INSTALLATIONS:

FIGURE 1

STANDOFFS (4)