Variable capacity refrigeration system

A variable capacity refrigeration system for a frozen product dispenser is controllable in response to cooling load requirements of the dispenser to have a variable cooling capacity that is in accordance with the cooling load demands placed on the refrigeration system by the dispenser. This is accomplished, in part, by providing the refrigeration system with a variable capacity compressor, the output capacity of which is controlled by varying its operating speed in a manner such that refrigerant output from the compressor generally meets the mass flow of refrigerant through expansion valves of the system. The arrangement provides for efficient operation of the frozen product dispenser from an energy standpoint and for a reduction in on/off cycling of the refrigeration system.