Johnson ControlsYork YVAA is a high-performance, variable-speed, air-cooled screw chiller that can deliver up to an 11.6 energy-efficiency ratio (EER) at full load and an integrated part-load value (IPLV) of up to 19.8. Available with a 150- to 350-ton capacity, the chiller uses HFC-134a refrigerant. Sound-attenuation options can reduce its ambient noise by as much as 16 dBA during off-design conditions. •