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INSTALLATION OF UNIT
12
Ductwork
Ductwork construction guidelines
Connections to the unit should be made with
3"(76mm) canvas connectors to minimize
noise and vibration transmission.
Elbows with turning vanes or splitters are rec-
ommended to minimize air noise and resist-
ance.
The first elbow in the ductwork leaving the
unit should be no closer than three times
blower diameter to avoid turbulence and back
pressure.
Attaching Horizontal Ductwork to
the Unit
All conditioned air ductwork should be insulat-
ed to minimize heating and cooling duct loss-
es. Use minimum of 2"(50mm) of insulation
with a vapor barrier. The outside ductwork
must be weather proofed between the unit
and the building.
When attaching ductwork to a horizontal unit,
provide a flexible water tight connection to
prevent noise transmission from the unit to
the ducts. The flexible connection must be
indoors and molded out of heavy canvas.
NOTE
!
• Do not draw the canvas taut between
the solid ducts.
Change Airflow
Horizontal flow to Down flow Conversion
1
Remove the covers from the down flow
openings on the base panel by unscrewing
as shown.
2
Close the horizontal Supply and Return
openings on the front panel by attaching
the covers firmly on to it which are
removed from the down flow openings.
* Cover assembly should be assembled as
insulation being downward.
(1)
(2)
Return cover
Supply cover
Figure 3
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