5834853-YIM-B-0320
Johnson Controls Ducted Systems
15
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 Figures 11 10 through 13 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 ZX08 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.
Figure 15: Side Duct Cover Panels
NOTE:
Shown with duct connection cover panel as shipped.
Figure 16: Bottom Return Opening For Side Duct
Conversion
O
Figure 17: Bottom Supply Opening For Side Duct
Conversion
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.
Side Duct
Cover Panels
Summary of Contents for ZZ Series
Page 10: ...5834853 YIM B 0320 10 Johnson Controls Ducted Systems Figure 10 ZZE07 08 Unit Dimension...
Page 11: ...5834853 YIM B 0320 Johnson Controls Ducted Systems 11 Figure 11 ZZ09 12 Unit Dimensions...
Page 12: ...5834853 YIM B 0320 12 Johnson Controls Ducted Systems Figure 12 ZZ14 Unit Dimensions...
