A refrigerant cycle is provided with a control that monitors system conditions
such as current, voltage or temperature at a compressor motor or refrigerant state
conditions at compressor ports. A protection switch on the motor is operable to
stop operation of the compressor should a system condition exceed a predetermined
maximum. The control monitors a system condition, and determines that the system
condition indicates the protection switch may be actuated as the condition is moving
toward the predetermined limit. Under such conditions, the control moves the compressor
to a less loaded mode of operation such that it is less likely that the protection
switch will actuate.
