Electrical Connections - Lennox CBX25UHV Series Installation And Service Procedure

F-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.
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
When sealing the cabinet, be sure to seal closed any
space around the holes where the drain lines exit the cab­
inet using duct tape and/or Permagum. Warm air must not
be allowed to enter through any gaps or holes in the cabi­
net.
Make sure the liquid line and suction line entry points are
sealed with either ARMAFLEX material or with Permagum.
Permagum may also be used to seal around the main and
auxiliary drains and around open areas of electrical inlets.
V-ELECTRICAL CONNECTIONS
WARNING
Electric shock hazard! Can cause injury
or death.
Disconnect all power supplies before
servicing.
Replace all parts and panels before op­
erating.
Failure to do so can result in death or
electrical shock.
WARNING
Electric shock hazard! Can cause injury
or death.
Unit must be grounded in accordance
with national and local codes. Connect
ground wire to ground terminal marked
"GND".
Line voltage is present at all compo­
nents when unit is not in operation on
units with single‐pole contactors. Dis­
connect all remote electric power sup­
plies 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 con­
nections within a ½" 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 electri­
cal 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.
● All field wiring must be done in accordance with
National Electrical Code, applicable requirements of
UL and local codes, where applicable.
● 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.
● The power supply must be sized and protected
according to the specifications supplied on the product.
● This air handler is factory-configured for 240 volt, single
phase, 60 cycles. For 208-volt applications, see "208
Volt Conversion" later in this section.
● For optional field‐installed electric heat applications,
refer to the instructions provided with the accessory for
proper installation.
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