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Sealing the Unit
Seal the unit so that warm air is not allowed into the cabi-
net. Warm air introduces moisture, which results in water
blow-off problems. This is especially important when the
unit is installed in an unconditioned area.
If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.
WARNING
There must be an airtight seal between the bottom of
the air handler and the return air plenum. Use fiberglass
sealing strips, caulking, or equivalent sealing method
between the plenum and the air handler cabinet to
ensure a tight seal. Return air must not be drawn from a
room where this air handler or any gas-fueled appliance
(i.e., water heater), or carbon monoxide-producing
device (i.e., wood fireplace) is installed.
IMPORTANT
Use duct tape and/ or Permagum to seal closed any
space around the holes where the drain lines exit the
cabinet. Warm air must not be allowed to enter through
any gaps or holes in the cabinet.
Electrical Connections
WARNING
Electric shock hazard! - Disconnect all power
supplies before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
WARNING
Run 24V Class II wiring only through specified low
voltage opening. Run line voltage wiring only through
specified high voltage opening. Do not combine voltage
in one opening.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple power
supplies.
WARNING
Electric Shock Hazard.
Can cause injury or death.
Foil-faced insulation has conductive
characteristics similar to metal. Be sure there
are no electrical connections within 13mm
of the insulation. If the foil-faced insulation
comes in contact with electrical voltage, the
foil could provide a path for current to pass
through to the outer metal cabinet. While
the current produced may not be enough to
trip existing electrical safety devices (e.g.,
fuses or circuit breakers), the current can be
enough to cause an electrical shock hazard
that could cause personal injury or death.
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components when
unit is not in operation on units with single-
pole contactors. Disconnect all remote electric
power supplies before opening access panel.
Unit may have multiple power supplies.
• Wiring must conform to local building codes. Refer to
the following wiring diagrams. See unit nameplate for
minimum circuit ampacity and maximum over-current
protection size.
• Electrical wiring, disconnect means and over-current
protection are to be supplied by the installer. Refer to
the air handler rating plate for maximum over-current
protection, minimum circuit ampacity, as well as oper-
ating voltage.
• The power supply must be sized and protected accord-
ing to the specifications supplied on the product.
•
This air handler is factory-configured for 220/240 volt,
single phase, 50 cycles.
• Separate openings have been provided for 24V low
voltage and line voltage. Refer to the dimension illustra-
tion of specific location.
• This unit is provided with holes for conduit. Use provid-
ed caps to seal holes not used.
•
Typical unit wiring is given in figure 19.
