The coil MUST be installed on air discharge side of furnace.
Under no circumstances should airflow be such that cooled,
conditioned air can pass over furnace heat exchanger. This
will cause condensation in heat exchanger and possible
failure of heat exchanger which could lead to a fire hazard
and/or a hazardous condition which may lead to bodily harm.
Heat exchanger failure due to improper installation may not
be covered by warranty.
b. In parallel airflow installation, dampers must be provided
to direct air over furnace heat exchanger when heat is
desired and over cooling coil when cooling is desired.
IMPORTANT:
The dampers should be adequate to prevent cooled
air from entering furnace. If manually operated, dampers must be
equipped with means to prevent operation of either cooling unit or
furnace unless damper is in full cool or full heat position.
Step 2—Horizontal Attic Installation
The furnace can be installed horizontally for either left- or
right-side supply. See Fig. 3 for a typical attic installation and
Reversing Procedure section for reversing airflow direction.
In attic installations, it is necessary to keep insulation at least
12 in. away from any furnace opening. Some types of
insulating materials are combustible.
1. Construct a working platform on location where all required
furnace clearances are met. (See Table 1 and Fig. 3.)
2. Position furnace in desired location.
3. Connect gas supply pipe. See Fig. 4 for typical gas piping.
4. Connect supply- and return-air ducts.
5. Install 24- X 24-in. sheet metal shield on platform in front of
controls as shown in Fig. 3.
Step 3—Horizontal Crawlspace Installation
The furnace can be installed horizontally for either left- or
right-side supply. In a crawlspace, the furnace can either be hung
from floor joists or installed on suitable blocks or a pad. The
furnace can be suspended using steel pipe straps around each end
of furnace. These straps should be attached to furnace with sheet
metal screws and to floor joists with lag bolts. A framed assembly
of angle iron suspended with all-thread rod of suitable diameter
may be used to support the length of furnace. Refer to Fig. 1 for
size and weight of furnace. Care must be taken to allow for blower
door access.
The horizontal crawlspace installation is very similar to the attic.
Refer to Horizontal Attic Installation section, items 2, 3, 4, and 5.
A 24- X 24-in. sheet metal shield must be installed above the
controls for crawlspace installations. Extend sheet metal shield
over furnace top far enough to cover gas pipe entry hole.
Step 4—Filter Arrangement
Never operate the unit without a filter or with the filter
removed. Failure to follow this caution can result in a fire,
personal injury, or death.
A factory-supplied filter and wire filter retainer are shipped with
furnace. After return-air duct has been connected to furnace, install
filter in blower compartment, just ahead of return-air plenum, and
secure it with wire filter retainer. The cross-mesh binding side of
filter should face blower. Refer to Table 2 for filter sizes.
Fig. 3—Typical Attic Installation
A96070
24
″
24
″
30-IN. MIN
WORK AREA
SHEET
METAL
6
