Ductwork
Ductwork should be designed and sized according
to the methods in Manual D of the Air Conditioning
Contractors of America (ACCA) or as recommended
by any other recognized authority such as ASHRAE
or SMACNA.
A closed return duct system should be used. This
will not preclude use of economizers or outdoor
fresh air intake. The supply and return air duct
connections at the unit should be made with flexible
joints to minimize noise.
The supply and return air duct systems should
be designed for the CFM and static pressure
requirements of the job. They should NOT be sized
to match the dimensions of the duct connections on
the unit.
Refer to Figure 11 through Figure 15 for bottom and
side air duct openings.
Duct covers
Units are shipped with the side duct openings
covered and a covering over the bottom of the
unit. For bottom duct application, Models and
ZY07 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 18: Side Duct Cover Panels
Note:
Shown with duct connection cover panel
as shipped.
Figure 19: Bottom Return Opening For Side Duct
Conversion
INSTALLATION MANUAL ZY SERIES 3 - 10 ton 60 Hertz R-410A
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Johnson Controls Ducted Systems
Summary of Contents for ZY Series
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