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WARNING
L
!
SAFETY HAZARD
DO NOT INSTALL THE FURNACE DIRECTLY ON
CARPETING,
TILE
OR
MATERIAL OTHER THAN WOOD FLOORING. FOR
VERTICAL DOWNFLOW APPLICATIONS, SUBBASE
(BAYBASE205)
MUST
FURNACE AND COMBUSTIBLE FLOORING. WHEN THE
DOWNFLOW FURNACE IS INSTALLED VERTICALLY
WITH A CASED COIL, A SUBBASE IS NOT REQUIRED.
FAILURE TO FOLLOW THE WARNING EXACTLY COULD
RESULT IN SERIOUS PERSONAL INJURY, PROPERTY
DAMAGE OR DEATH.
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.
1
STANDOFFS
(BOTH SIDES)
2
3
FURNACE
FRONT
TABLE 1
FLOOR OPENING PLENUM OPENING
CABINET
RETURN
WIDTH
DUCT WIDTH
17-1/2"
16-1/4"
16-5/8"
21"
19-3/4"
20-1/8"
24-1/2"
23-1/4"
23-5/8"
OTHER
COMBUSTIBLE
BE
USED
BETWEEN THE
STANDOFFS (4)
DRILL SCREWS (4)
FOR VERTICAL
INSTALLATIONS:
SCREWS
(BOTH SIDES)
A (width)
B (depth)
D
C
"A"
"B"
"C"
20-1/8"
15-5/8"
19-3/8"
20-1/8"
19-1/8"
19-3/8"
20-1/8"
22-5/8"
19-3/8"
DOWNFLOW INSTALLATIONS
REQUIRED FLOOR OPENING: (DOWNFLOW)
SEE FIGURE 2 AND FIGURE 3, AND TABLE 1
HORIZONTAL INSTALLATION
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 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% or greater 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 either
direction of the airflow for horizontal installation. The
cased coil is secured to the furnace and both the furnace
and the cased coil must be properly supported.
4
CASED COIL CONNECTION
BRACKET FOR DOWNFLOW
FURNACE IN HORIZONTAL
DOWNFLOW ONLY
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 coil requires additional support.
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 Figure 5 & Clearance Tables, on
the Outline drawings on pages 4-5). 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.
"D"
18-CD30D1-12
Installer's Guide
7
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