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Installer's Guide
Ductwork Installation
Attaching Downflow Ductwork to Roof Curb
Supply and return air flanges are provided on the BAYCURB050
and BAYCURB051 model roof curbs for easy duct installation. All
ductwork must be run and attached to the curb before the unit is
set into place.
Attaching Downflow Ductwork to Roof Frame
Follow these guidelines for ductwork construction:
Connections to the unit should be made with three inch canvas
connectors to minimize noise and vibration transmission.
Elbows with turning vanes or splitters are recommended to minimize
air noise and resistance.
The first elbow in the ductwork leaving the unit should be no closer
than two (2) feet from the unit to minimize noise and resistance.
To prevent leaking, do not attach the ductwork to the bottom of the
unit base; refer to the bottom example in Figure 14.
AIR PROOF
THIS SEAM
FIELD DUCT
UNIT DUCT
FLANGE
FIELD
DUCT
UNIT DUCT
FLANGE
NOT RECOMMENDED
Figure 14. Down Airflow Ductwork
Attaching Horizontal Ductwork to Unit
All conditioned air ductwork should be insulated to minimize heating
and cooling duct losses. Use a minimum of two (2) inches of insulation
with a vapor barrier. The outside ductwork must be weatherproofed
between the unit and the building. See Figure 12.
When attaching ductwork to a horizontal unit, provide a flexible
watertight connection to prevent noise transmission from the unit
to the ducts. The flexible connection must be indoors and made
out of heavy canvas.
NOTE: Do not draw the canvas taut between the solid ducts.
Page 16
UNIT BASE
UNIT DUCT
FLANGE
AIR PROOF
THIS SEAM
UNIT BASE
FIELD DUCT
AIR PROOF
THIS SEAM
UNIT BASE
UNIT DUCT FLANGE
UNIT BASE
WATERPROOF SEAM
WITH BUTYL OR
SILICONE
FIELD DUCT
FIELD DUCT
WEATHERPROOF
FIELD DUCT
Figure 15. Horizontal Airflow Ductwork
Condensate Drain Piping
A 3/4-inch female NPT condensate drain connection is provided on
the filter access panel end of the unit. Provide a trap and fill it with
water before starting the unit to avoid air from being drawn through.
Follow local codes and standard piping practices when running the
drain line. Pitch the line downward away from the unit. Avoid long
horizontal runs. See Figure 16.
NOTE: Do not use reducing fittings in the drain lines.
The condensate drain must be:
Made of 3/4" pipe size.
〿
Pitched 1/4" per foot to provide free drainage to convenient drain
〿
system.
Trapped.
〿
Must not be connected to a closed drain system unless the trap
〿
is properly vented.
/
" PVC OR COPPER
3
4
TUBING AND FITTINGS
1-1/2"
MIN.
1-1/2"
MIN.
Figure 16. Typical Condensate Drain Piping
UNIT EXTERIOR
WEATHERPROOF
THIS SEAM
UNIT EXTERIOR
THIS SEAM
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