Refrigeration system having adjustable refrigeration capacity

[0025]FIG. 1 is a schematic diagram of a refrigeration system, shown generally as 10, having an adjustment system, shown generally as 12, for adjusting refrigeration capacity thereof. Broadly speaking, the system 10 includes at least one, but preferably two or more, refrigerating compressors 14, adjustment system 12, an outdoor air-cooled condenser 16 as a refrigerant condensing means, at least one evaporator 18, a refrigerant liquid receiver 20, one or more refrigeration expansion valves 22, and optionally, heat reclaim means 24. System 10 also includes a plurality of conduits, also referred to as lines and manifolds, through which refrigerant is circulated in system 10 for refrigerating therewith a thermal load between refrigerating compressors 14, adjustment system 12, refrigerant condensing means 16, evaporator 18, refrigerant liquid receiver 20, refrigeration expansion valves 22, and heat reclaim means 24, all of which are connected in fluid communication for refrigerant by condui