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Component Installation
Figure 49. Filter block-off placement
Duct Connections
All duct connections to the air handlers should be installed
in accordance with the standards of the National Fire
Protection Association (NFPA):
•
NFPA 90A for installing air conditioning and ventilating
systems other than residence type.
•
NFPA 90B for residence-type warm air heating and air-
conditioning systems.
See unit submittal documentation for additional duct
mounting information.
Fan Discharge Connections
To ensure the highest fan efficiency, duct turns and
transitions must be made carefully, minimizing air friction
losses and turbulence. Proper ductwork installation, as
outlined by such organizations as Sheet Metal and Air
Conditioning Contractors National Association, Inc.
(SMACNA), should be followed closely.
Indoor unit fan sections with rectangular or round
openings should have flanged ductwork attached to
bottom panel opening. When using lined ducts, the
insulation should not obstruct the discharge opening. For
plenum fan sections with bell mouth fittings, see
Mouth Discharge Connections," p.
Damper Connections
Standard damper sections include mixing sections, filter
mixing sections, face dampers sections, and internal face-
and-bypass sections. There are two damper blade
configurations available - parallel-blade and opposed-
blade. Traq™ dampers are another type of damper
available in mixing box sections.
Ductwork attached to the standard damper sections
should be sized to fit the opening of the damper. Duct
opening dimensions are provided in the submittals. When
using lined duct, ensure that the insulation does not
38
"Bell
40.
obstruct the damper opening (see
Figure
51).
Note: Damper blades should be checked for proper
operation from full-open to full-closed position
before unit start up. Damper blade positioning may
have changed due to shipping and handling
vibrations.
Figure 50. Typical duct flat/flange connection -
uninsulated or externally insulated
Figure 51. Typical section with duct flat/flange
connection- internally insulated
Bottom Opening Duct Installation
1. Install gasket to duct flange to ensure air tight seal.
2. Install duct into place underneath framed opening in
unit base per
Figure
52. Refer to factory curb layout
provided with unit submittals for duct size and
location.
Figure 50
and
CLCH-SVX013B-EN
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