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WARNING
s
s
SAFETY HAZARD
DO NOT INSTALL THE FURNACE DIRECTLY ON CARPETING,
TILE OR OTHER COMBUSTIBLE MATERIAL OTHER THAN
WOOD FLOORING. FOR VERTICAL DOWNFLOW APPLICATIONS,
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. 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.
NOTE: The top flanges on the furnace must be bent 90
degrees upward to allow the coil attachment.
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)
DOWNFLOW INSTALLATIONS
REQUIRED FLOOR OPENING: (DOWNFLOW)
SEE FIGURE 2 AND FIGURE 3, AND TABLE 1
HORIZONTAL INSTALLATION
IMPORTANT:
The 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
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 cased coil in the horizontal position. See
DRILL SCREWS (4)
STANDOFFS (4)
FOR VERTICAL
INSTALLATIONS:
SCREWS
(BOTH SIDES)
18-CD30D1-20-EN
Installer's Guide
②
③
FURNACE
FRONT
FLOOR OPENING
CABINET
RETURN DUCT
WIDTH
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"
④
CASED COIL CONNECTION
BRACKET FOR DOWNFLOW
FURNACE IN HORIZONTAL
DOWNFLOW ONLY
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.
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.
A (width)
B (depth)
D
C
TABLE 1
PLENUM OPENING
"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"
"D"
7
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