pan from overflowing. Prime the trap with water. Connect a drain
tube using a minimum of 3/4-in. PVC, 3/4-in. CPVC, or 3/4-in.
copper pipe (all field supplied). Do not undersize the tube. Pitch
the drain tube downward at a slope of at least 1 in. for every 10 ft
of horizontal run. Be sure to check the drain tube for leaks. Prime
trap at the beginning of the cooling season start-up.
Step 7—Install Duct Connections
The unit has duct flanges on the supply- and return-air openings on
the side and bottom of the unit. For downshot applications the
ductwork can be connected to the roof curb. See Fig. 2-5 for
connection sizes and locations.
IMPORTANT:
Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weathertight and airtight seal. When electric heat is
installed, use fire proof canvas (or similar heat resistant material)
connector between ductwork and unit discharge connection. If
flexible duct is used, insert a sheet metal sleeve inside duct. Heat
resistant duct connector (or sheet metal sleeve) must extend 24-in.
from the unit discharge connection flange into the ductwork.
ACCESSORY DUCT FLANGE KIT INSTALLATION-
1. Mark hole locations (See instructions included in Flange Kit).
Do not drill deeper than 1/2–in. into area between round duct
openings. Damage to refrigerant coil could result.
2. At marked locations, drill holes using a no. 26 (.147-in.) twist
drill (See Fig. 19).
3. Partially secure duct flanges using two of the no. 10, 1/2-in.
screws provided.
Fig. 6— Roof Curb Dimensions
ODS CATALOG NUMBER
A
IN. (MM)
Flat
Curb
CPRFCURB001A00
8 (203)
CPRFCURB002A00
11 (279)
CPRFCURB003A00
14 (356)
C95007
7