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Page 4 of 12 507296-02Cmrcool.com
or pigtail leads located on the main control box and are
during normal operation.
CAUTION
Units are factory wired for a 230-volt power supply.
If power supply is 208 volts, it will be necessary to
change a wire connection on the unit transformer from
240V terminal to 208V terminal as shown on the wiring
diagram.
Use only copper conductors.
Thermostat
The room thermostat should be located on an inside
installation.
changed
Single Phase
Contactor
or Circuit Breaker
Disconnect
Figure 3. 208/230 Line Voltage Wiring
Figure 4. Typical Wiring Connections
*
“O” connection used only on heat pump models
*
off W1 only.
Duct System
Duct system should be designed and sized according to the
methods in Manual Q of the Air Conditioning Contractors of
A closed return duct system shall be used. This shall not
preclude use of economizers or outdoor fresh air intake. It
is recommended that supply and return duct connections
The supply and return air duct systems should be designed
for the CFM and static requirements of the job. They
should not be sized to match the dimensions of the
duct connections on the unit.
panel. Duct to unit connections must be sealed and
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