YORK YVFA is the first AHRI-certified integrated variable-speed-drive (VSD) screw chiller with free cooling. It is available in nominal sizes 150 to 450, yielding over 600 TR (2,110 kW). The VSD compressors ensure efficient operation across all cooling-load and ambient-temperature conditions, while the integrated high-efficiency air-to-liquid free-cooling coils reduce or eliminate the need for mechanical cooling when ambient conditions allow. Intelligent controls optimize energy use year-round.