Use Copper Conductors Only - Lennox Merit CBX25UHV Installation Instructions Manual

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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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The power supply must be sized and protected
according to the specifications supplied on the
product.
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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.
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Separate openings have been provided for 24V low
voltage and line voltage. Refer to the dimension
illustration of specific location.
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This unit is provided with holes for conduit. Use
provided caps to seal holes not used.
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Typical unit wiring (as well as wiring of optional
field-installed electric heat) is given in figure 21. Refer
to the instructions provided with the electric heat
section for proper installation.
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See figure 22 for typical low voltage field wiring
connections.
WARNING

USE COPPER CONDUCTORS ONLY

1 - Disconnect all power supplies.
2 - Remove the air handler access panel.
3 - Route the field supply wires to the air handler electrical
connection box.
4 - Use UL-listed wire nuts to connect the field supply
conductors to the unit black and yellow leads, and the
ground wire to ground terminal marked GND.
5 - Replace the air handler access panel.
LOW VOLTAGE TERMINAL STRIP
Figure 19. Electrical Connections
(Upflow Configuration)
208 VOLT CONVERSION
1 - Disconnect all power supplies.
2 - Remove the air handler access panel.
3 - Using the wiring diagram located on the unit access
panel as a reference, move the black transformer
leads from the 240-volt terminal on the transformer to
the 208-volt terminal on the transformer.
See figure 20.
208 / 240 VOLT TRANSFORMER
240 Volts
Figure 20. Converting Unit from 240 VAC to 208 VAC
Page 14
PRIMARY SECONDARY
208 Volts