Page 5
507111-02 2/2015
Horizontal Air Discharge
Unit is shipped with panels covering the horizontal supply
and return air openings. See figure 3.
FIGURE 3
DOWNFLOW
RETURN AIR
OPENING
UNIT SUPPLY AND RETURN AIR OPENINGS
DOWNFLOW
SUPPLY AIR
OPENING
HORIZONTAL
RETURN AIR
OPENING
HORIZONTAL
SUPPLY AIR
OPENING
1- Remove horizontal covers and place a bead of silicone
sealant on the underside of the duct cover flanges. See
figure 4.
2- Position covers over downflow openings. Secure
covers with self-drilling screws in at least two places on
each cover. Drill through duct cover side into flange of
base pan.
3- Place a bead of silicone between insulation and duct
cover to seal in insulation edges. Let silicone dry before
running gas or electric heat.
Units Equipped With An Optional Horizontal Economizer
1- Install the horizontal supply air cover over the down
flow supply air opening as described above.
2- Leave the horizontal return air cover in place.
3- Locate the extra horizontal return cover that is
included with the horizontal economizer kit. Install as
described in previous section.
FIGURE 4
INSTALL DUCT COVERS - SIDE VIEW
ÉÉÉÉÉÉ
ÉÉÉÉÉÉ
ÉÉÉÉÉ
INSULATION
UNIT BASE
FLANGES
DUCT COVER
FLANGES
APPLY SILICONE
SEALANT TO
FLANGES
ÉÉÉÉÉÉ
ÉÉÉÉÉÉ
ÉÉÉÉÉ
APPLY SILICONE SEALANT
BETWEEN DUCT COVER
FLANGE AND UNIT INSULATION
NOT TO
SCALE
4- Install return air duct on the intake air side of the
horizontal economizer. See figure 5.
5- Horizontal economizer and return air duct must be
field-supported.
This opening not used
in horizontal applica
tions with economizer
HORIZONTAL
RETURN AIR DUCT
(FIELD-PROVIDED)
UNIT
HORIZONTAL
SUPPLY AIR DUCT
(FIELD-PROVIDED)
OPTIONAL
HORIZONTAL
ECONOMIZER
HOOD
PROVIDED
WITH
ECONOMIZER
FIGURE 5
HORIZONTAL RETURN AIR DUCTWORK
WITH ECONOMIZER
Condensate Drains
Make drain connection to the drain coupling provided
on unit.
Note - The drain pan is made with a glass reinforced
engineered plastic capable of withstanding typical joint
torque but can be damaged with excessive force. Tighten
pipe nipple hand tight and turn an additional quarter turn.
A trap must be installed between drain connection and an
open vent for proper condensate removal. See figure 6. It is
sometimes acceptable to drain condensate onto the roof or
grade; however, a tee should be fitted to the trap to direct
condensate downward. The condensate line must be
vented. Check local codes concerning condensate disposal.
Refer to pages 1 and 2 for condensate drain location.
FIGURE 6
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UNIT
Minimum Pitch
1” (25 mm) per
10' (3 m) of line
MOUNTING
FRAME
OPEN VENT
CONDENSATE SIDE DRAIN CONNECTION
NOTE - Allow clearance to
open doors when installing
condensate piping.
CAULK AROUND CONDENSATE COUPLING
