• No perimeter supply flanges are provided. If a full perimeter supply duct is used, it is
the responsibility of the installer to provide duct flanges as needed, to secure and seal
the supply duct to prevent air leakage and the sweating that will result.
• Apply caulking around all cabinet penetrations such as power wires, control wires,
refrigerant tubing and condensate line where they enter the cabinet. Seal the power
wires on the inside where they exit conduit opening. Sealing is required to prevent air
leakage into the unit which can result in condensate forming inside the unit, control
box, and on electrical controls. Take care not to damage, remove or compress insula-
tion when applying the caulk.
• In some cases, the entire air handler can be wrapped with insulation. This can be
done as long as the unit is completely enclosed in insulation, sealed and service
access is provided to prevent accumulation of moisture inside the insulation wrap.
• An auxiliary overflow pan is recommended to protect the structure from excessive
cabinet sweating or a restricted coil drain line. (See Section 3.3)
• If an electric heater kit is installed, be sure the breaker or disconnect cover is sealed
tightly to the door panel.
3.2.4 INSTALLATION IN CORROSIVE ENVIRONMENTS
The metal parts of this unit may be subject to rust or deterioration if exposed to a cor-
rosive environment which can shorten its life. In addition to exposure to the exterior of
the cabinet, chemical contaminants inside the building that can be drawn into the unit
from the return air grille and attack structural metal parts, electrical components and the
indoor coil, causing premature failure of the unit. If the unit is to be installed in an area
where contaminants are likely to be a problem, special attention should be given to iso-
late the unit and return grille from contaminants.
11
FIGURE 5
WALL MOUNT
