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MERIT
®
CBX25UHV SERIES
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 air-tight 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 op
erating.
Failure to do so can result in death or elec
trical 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.
Foil‐faced insulation has conductive characteristics sim
ilar to metal. Be sure there are no electrical connections
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 electrical safety devices (e.g.
fuses or circuit breakers), the current can be enough to
cause an electric shock hazard that could cause person
al injury or death.
WARNING
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
Electrically ground air handler. Connect
ground wire to ground terminal marked
“GND”.
Failure to do so can result in death or elec
trical shock.
●
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.
