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Field Mounting Junction Boxes and
Other Components
For field mounting 4" × 4" or smaller junction boxes to the
standard panel exterior, use a minimum quantity of four, 3/16"
diameter pop rivets. Do not use self-tapping drill screws .
They will not tighten nor secure properly and panel
damage can occur .
If larger, heavier components require mounting on unit panels,
use through-bolts with flat washers through both outer and
inner panels. To maintain panel integrity, seal both ends with
an industrial/commercial grade silicone sealant or duct seal
compound.
The unit frame channel is another excellent location for
securing heavier components; self-tapping screws are not
acceptable. Ensure that the location permits the full operation
of all access doors and panels and does not interfere with
other vital components.
Duct Connections
Use flexible connectors on the outlet and inlet duct connections
of all units. Do not position down flow fans over air ducts that
are routed down into the building. Use a discharge plenum
when bottom connections are necessary
Figure 16: Discharge Plenum
If the unit has a top mixing box or economizer damper or a top
duct connection, field fabricate and install flashing to divert
moisture from the connection. The flashing must lap over the
standing seams of the top panels. The flashing also must lap
over the side edges of the unit
IM 777-8 • Skyline Air Handler
(Figure
16).
D i s c h a r g e
P l e n u m
(Figure
17).
Figure 17: Flashing Over Top Panels and Sides of Units
F l a s h i n g
D u c t
F l a s h i n g
Dampers and Hoods
Side dampers may be provided in the mixing box and
economizer sections of units. When dampers are provided,
a removable panel is located above the weather hood to
provide access to the damper drive shaft. Other access may
be available depending on the specific construction of the unit
(Figure
18).
Figure 18: Filler Panel Over the Weather Hood
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F l a s h i n g
U n i t t o p
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F l a s h i n g
D u c t
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