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• Design the duct system in accordance with "ACCA" Manual "0" Design for Residential Winter
and Summer Air Conditioning and Equipment Selection. Latest editions are available from:
"ACCA" Air Conditioning Contractors of America, 1513 16th Street, N.W., Washington, D.C.
20036. If duct system incorporates flexible air duct, be sure pressure drop Information (straight
length plus all turns) shown in "ACCA" Manual "D" is accounted for in system.
• Supply plenum is attached to the 3/4" duct flanges supplied with the unit. Attach flanges
around the blower outlet.
IMPORTANT
If an elbow is included in the plenum close to the unit, it must not be smaller than the
dimensions of the supply duct flange on the unit.
IMPORTANT
The front flange on the return duct if connected to the blower casing must not be screwed into
the area where the power wiring is located. Drills or sharp screw points can damage insulation
on wires located inside unit.
• Secure the supply and return ductwork to the unit flanges, using proper fasteners for the type
of duct used and tape the duct-to-unit joint as required to prevent air leaks.
7. Refrigerant connections
Keep the coil connections sealed until refrigerant connections are made. See the Installation
Instructions for the outdoor unit for details on line sizing, tubing installation, and charging
information.
Coil is shipped with "No charge". Evacuate the system before charging with refrigerant. Install
refrigerant tubing so that it does not block service access to the front of the unit.
Nitrogen should flow through the refrigerant lines while brazing.
Use a brazing shield to protect the cabinet's paint and a wet rag to protect the rubber grommet
from being damaged by torch flames. After the refrigerant connections are made, seal the gap
around the connections with pressure sensitive gasket.
7.1 Condensate drain tubing
Consult local codes for specific requirements.
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