Sealing The Unit; Electrical Connections - Lennox CBA25UH Installation Instructions Manual

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.
Electric Shock Hazard.
Can cause injury or death.
Foil-faced
characteristics similar to metal. Be sure there
are no electrical connections within 1/2ʺ
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.
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 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-cur-
rent protection size.
• Electrical wiring, disconnect means and over-current pro-
tection 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.
• The power supply must be sized and protected accord-
ing 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.
• 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 (as well as wiring of optional field-in-
stalled electric heat) is given in figure 14. Refer to the
instructions provided with the electric heat section for
proper installation.
Page 12
WARNING
insulation has
WARNING
conductive