Page 13
CBX25UH SERIES
S 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.
S Separate openings have been provided for 24V low
voltage and line voltage. Refer to the dimension
illustration of specific location.
S This unit is provided with holes for conduit. Use
provided caps to seal holes not used.
S Typical unit wiring (as well as wiring of optional
field-installed electric heat) is given in figure 18. Refer
to the instructions provided with the electric heat
section for proper installation.
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.
SIDE
TOP
Figure 15. Electrical Connections
(Upflow Configuration)
NOTE - To avoid the possibility of moisture damage to the
control in some right-hand discharge configurations, the
control panel can be relocated to the end panel as shown in
figure 16.
TOP
SIDE
Figure 16. Control Panel Relocated to End Panel
(Left-Hand Horizontal 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 2 connected black
transformer leads from the 240 volt terminal on the
transformer to the 208 volt terminal on the transformer.
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.
208 / 240 VOLT TRANSFORMER
PRIMARY SECONDARY
240 Volts
208 Volts
Figure 17. Converting Unit from 240 VAC to 208 VAC
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