Reciprocating compressors use a piston to compress the refrigerant.
Rotary compressors utilize a roller rotating eccentrically inside a cylinder and a spring mounted blade always rubbing against the roller. As the eccentric rotates towards the blade, the space is decreased and the refrigerant is compressed. Rotary compressors are very efficient.
Scroll compressors consists of 2 scrolls to pressurize refrigerant. Often 1 scroll is fixed and the other orbits eccentrically compressing the gas between the scrolls. Scroll compressors are quiet, smooth and offer highest efficiency ratio of all compressor types.
Scroll Ultratech™ compressors are advanced scroll compressors which offer more features and better diagnostics.