507621-01 Issue 1720 Page 13 of 23
Sealing the Unit
Seal the unit so that warm air is not allowed into the cabinet.
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.
There must be an airtight seal between the bottom of
the air handler and the return air plenum. Use berglass
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 (ie., water heater), or carbon monoxide-
producing device (ie., wood replace) is installed.
WARNING
When sealing the cabinet, be sure to seal closed any
space around the holes where the drain lines exit the
cabinet using duct tape and/or Permagum. Warm air
must not be allowed to enter through any gaps or
holes in the cabinet.
IMPORTANT
Make sure the liquid line and suction line entry points
are sealed with either Armaex material or with
Permagum. Permagum may also be used to seal
around the main and auxiliary drains and around open
areas of electrical inlets.
IMPORTANT
Electrical Connections
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 specied low
voltage opening. Run line voltage wiring only through
specied high voltage opening. Do not combine
voltage in one opening.
WARNING
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 a 1/2” 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 electric shock
hazard that could cause personal injury or death.
ELECTRIC SHOCK HAZARD
Can cause injury or death. Unit must be
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
• Wiring must conform to the current National Electric
Code ANSI/NFPA No. 70, or Canadian Electric Code
Part I, CSA Standard C22.1, and local building codes.
Refer to 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 operating voltage.
Select the proper supply circuit conductors in
accordance with tables 310-16 and 310-17 in the
National Electric Code, ANSI/NFPA No. 70 or tables 1
through 4 in the Canadian Electric Code, Part I, CSA
Standard C22.1.
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