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Intake Piping
The EL195UHNE furnace may be installed in either direct
vent or non-direct vent applications. In non-direct vent
applications, when intake air will be drawn into the furnace
from the surrounding space, the indoor air quality must be
considered and guidelines listed in Combustion, Dilution
and Ventilation Air section must be followed.
Follow the next two steps when installing the unit in Direct
Vent applications, where combustion air is taken from
outdoors and flue gases are discharged outdoors. The
provided air intake screen must not be used in direct
vent applications (outdoors).
1 - Use transition solvent cement or a sheet metal screw
to secure the intake pipe to the inlet air connector.
CAUTION
Carefully apply solvent cement to air intake fitting and
avoid plugging hose barbed fitting in the coupling. See
FIGURE 28.
Hose Barb Fitting
FIGURE 28
2 - Route piping to outside of structure. Continue with
installation following instructions given in general
guidelines for piping terminations and intake and
exhaust piping terminations for direct vent sections.
Refer to TABLE 5 for pipe sizes.
Follow the next two steps when installing the unit in Non-
Direct Vent applications where combustion air is taken
from indoors and flue gases are discharged outdoors.
1 - Use field-provided materials and the factory-
provided air intake screen to route the intake piping
as shown in FIGURE 29 or FIGURE 30. Maintain
a minimum clearance of 3" (76mm) around the
air intake opening. The air intake opening (with
the protective screen) should always be directed
forward or to either side in the upflow position, and
either straight out or downward in the horizontal
position. The air intake piping must not terminate
too close to the flooring or a platform. Ensure that
the intake air inlet will not be obstructed by loose
insulation or other items that may clog the debris
screen.
2 - If intake air is drawn from a ventilated attic (FIGURE
31) or ventilated crawlspace (FIGURE 32) the exhaust
vent length must not exceed those listed in TABLE 6.
If 3" diameter pipe is used, reduce to 2" diameter
pipe at the termination point to accommodate the
debris screen.
3 - Use a sheet metal screw to secure the intake pipe to
the connector, if desired.
Combustion Air Intake
TYPICAL AIR INTAKE PIPE CONNECTIONS
NOTE - Debris screen and elbow may be rotated, so that
screen may be positioned to face forward or to either side.
TYPICAL AIR INTAKE PIPE CONNECTIONS
HORIZONTAL NON−DIRECT VENT APPLICATIONS
(Horizontal Right−Hand Air Discharge Application Shown)
NOTE - Debris screen may be positioned
with elbow rotated to face down or face up.
Page 23
UPFLOW NON−DIRECT
VENT APPLICATIONS
FIGURE 29
FIGURE 30
INTAKE
DEBRIS
SCREEN
(Provided)
INTAKE
DEBRIS
SCREEN
(Provided)
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