Comfort-Aire WDG Air Handler Series - Manual (Page 9)

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Installation, Operation & Maintenance WDG AIR HANDLER SERIES Heat Controller, LLC
3. If the unit is suspended, it must be supported from the bottom
near both ends as well as the middle to prevent sagging.
The service access must remain unobstructed. If the unit is
supported along the length of the front and back, the air handler
only needs to be suspended at both ends. See Figure 1.
4. If the unit is not suspended it must be supported as mentioned
above and isolated carefully to prevent sound transmission.
Vibration isolators (purchased locally) must be placed under the
unit.
5. It is always recommended that an auxiliary drain pan be
installed under a horizontal air handler (See Condensate Drain
Piping) to prevent possible damage to ceilings.
6. Isolate the auxiliary drain pan from the unit or from the structure.
7. Connect the auxiliary drain line to a separate drain line (no trap
is needed in this line) and terminate according to national and
local codes.
8. If a return duct is connected to the air handler, it must be the
same dimensions as the return opening shown in the outline
drawing on Figure 2.
9. Openings where fi eld wiring enters the cabinet must be
completely sealed. Location of power entry is shown on the
outline drawing.
10. After ductwork connections are made, seal airtight and per local
codes.
Duct Connections
The supply and return air ducts should be connected to the unit
with fl ame retardant duct connectors.
NOTE: No sheetmetal screws may be used to attach
return ductwork on the side.
NOTE: Any duct board return connection can be made
to the sides of the unit using tape or mastic.
Installation
Figure 1: Mounting Installation Options
Tr anquilit
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E ar thP
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Rail
Auxiliary
Drain Pan
Tr anquilit
y
Ear
thP
ure
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Tr anquilit
y
Ear
thP
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Tr anquilit
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Ear
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Figure 2: Flange Attachment