Johnson Controls ZL Series Installation Manual page 18

Duct covers
Units are shipped with the side duct openings
covered and a covering over the bottom of the unit.
For bottom duct application, ZL models require
a filler plate to be removed from the return air
opening, for all other models no other changes are
necessary. For side duct application, remove the
side duct covers and install over the bottom duct
openings. The panels removed from the side duct
connections are designed to be reused by securing
each panel to its respective bottom duct opening,
but keep in mind that the supply and return panels
are installed with the painted surface DOWN, facing
the bottom duct opening. The gasket must be
removed from the insulation side of the duct cover
so it is not directly exposed to the heating elements.
The panels are secured by sliding them into slots in
the back of the duct openings and screwing them
to the base of the unit with screws (Use screws
removed from original panel location). Seals around
duct openings must be tight.
CAUTION
When fastening ductwork to side duct flanges on unit,
insert screws through duct flanges only. DO NOT
insert screws through casing. Outdoor ductwork must
be insulated and water-proofed.
Figure 14: Side duct cover panels
Note: Shown with duct connection cover panel
as shipped.
18 Installation Manual ZL Series 7.5- 12.5 Ton 60 Hertz R-410A
Figure 15: Bottom return opening for side duct
conversion
Figure 16: Bottom supply opening for side duct
conversion
Johnson Controls Ducted Systems