# 45464K003
Page 10
When installing a CAM coil in a horizontal position with a
horizontal gas furnace, always keep the open end of the
A-coil
facing the supply air outlet
of the furnace (blow into
the open end of the A-coil). The A-coil should
point away
from the supply air outlet
of the furnace (see Figure 11).
If a cooling coil is not installed with the furnace, then a
removable access panel should be provided in the supply
plenum for purposes of inspecting the heat exchanger.
This opening shall be accessible when the furnace is
installed, and shall be of such size that the heat exchanger
can be viewed for possible openings using light assistance
or a probe can be inserted for sampling the air stream. The
cover for the opening shall be leaktight.
Upflow Installations
G1N80BU, G1N80BT, CG80UB, and CG80TB series
furnaces can be installed as upflow units with either a side
or bottom air return. For units that do not include a side
return filter rack, kit AFILT524 can be used. Bottom filter
kit AFILT529 can be used with all G1N80BU, G1N80BT,
CG80UB, and CG80TB series furnaces.
For side return installation, a full-size return air opening
must be cut in the side panel. A starter hole and corner
embossments are provided in each side (see Figure 13 in
the
Filters
section).
To provide sufficient filter area for installations requiring
more than 1600 CFM nominal air delivery, return air will
have to be brought through both sides of the furnace,
through one side and the bottom, or optional filter rack
AFILTHA7 may be used.
When side return is desired on a furnace with
an open bottom, the bottom must be sealed
with a piece of sheet metal large enough to
cover the entire opening. Failure to connect a
return air duct to the bottom, or to enclose
the bottom when side return is desired, may
result in combustion products being drawn
into the circulating air stream which could
result in asphyxiation.
WARNING
Horizontal Installations
G1N80BR, G1N80BT, CG80RB, and CG80TB series
furnaces can be horizontally installed for airflow right to left
or left to right. These furnaces are to be installed so that
the burner and blower access panels are in a vertical
plane; they are
NOT
to be installed such that these panels
are in a horizontal plane (see Figure 1 on page 2).
Never
install any furnace on its back.
Counterflow (Downflow) Installations
G1N80BR and CG80RB furnaces may be installed directly
on the supply plenum or coil cabinet if the furnace is
installed on a non-combustible floor.
For installations on combustible flooring, a special base
must be ordered and used. (See the
Accessories
section on
page 18 for more information.) To install the special base:
1. Cut a hole in the floor, sized to provide 1" clearance
between all four sides of the duct and the edge of the
flooring (see Figure 12). The four angles on the base
assembly should recess into the floor joists and the
base should rest on all four outside flanges.
2. Construct duct connections with 1" to 1-3/4" right
angle flanges, and long enough to extend below the
floor joists.
3. Drop the duct connections through the top of the base
assembly with the right angle flanges in good contact
with the glass tape on top of the base assembly.
4. Carefully position furnace over right angle duct flanges.
Filters
Filters are not supplied with CG80UB, CG80TB, or
CG80RB series furnaces.
G1N80BU Models
A filter rack and washable 16" x 25" x 1/2" filter are
supplied with each G1N80BU furnace. (Models designed
Figure 11
Correct Positioning of CAM Coil in the
Horizontal Position with a Gas Furnace
Return
Supply
Correct
Return
Supply
Incorrect