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Section 9. Connecting the Duct work
9.1 Duct Connection Considerations
• The supply and return air ducts must be connected
to the unit with non flammable duct connectors.
• See the Outline drawing for sizes of the duct con-
nections.
• After the ducts are secured, seal around the sup-
ply and return ducts to prevent air leakage.
• Insulate all duct work that will be outside of condi-
tioned spaces.
• Convertible Duct Flange Kits are available to con-
nect the supply plenum or for mounting on the
discharge opening to provide a “flush fit” for 1-1/2”
duct board applications.
• If front or rear return is required, the air handler
must be elevated - placed on a pedestal or plenum
and duct must be connected to this pedestal or
plenum.
• If side return is required, the Side Return Kit #
BAYSRKIT100A accessory must be used. A re-
mote filter will be required.
• To ensure maximum efficiency and system perfor-
mance, the existing supply and return duct system
static pressures must not exceed the total available
static pressure of the air handler. Reference ACCA
Manual D, Manual S and Manual RS along with
the air handler Product Data and Service Facts for
additional information.
Note:
Side return is not approved without Side
Return Kit # BAYSRKIT100. More than one Side
Return Kit may be necessary depending on the
application. Refer to the Installation Guide in
BAYSRKIT100 for approved duct connections,
sizing, number, transitions, and accessory
application.
Note:
Duct work must be supported as appropriate.
See National and local codes for guidelines. Do not
depend on the unit to support duct work.
Important:
Due to the unique design of this unit,
which allows the electrical wiring to be routed within
the insulation, do not screw, cut, or otherwise punc-
ture the unit cabinet in any location other than the
ones illustrated in this Installer Guide or in an ap-
proved accessory’s Installer Guide.
Important:
Under no conditions should metal strap-
ping be attached to the unit to be used as support
mechanisms for carrying or suspension purposes.
Important:
On units with sheet metal returns: Return
air plenum must be flanged. Sheet metal drill point
screws must be 1/2” in length or shorter.
Screws allowed in
first 3/4” of bottom
cross member.
3/4”
