YVAA Variable Speed Drive Screw Chiller

150-575 TR (525 - 2,020 kW)

With more than 22,000 units installed and proven globally, the YVAA VSD screw chiller has excelled in a variety of applications.

  • Customizable for specific job requirements
  • Patented, liquid-cooled, variable-speed drive technology
  • Available for performance testing in an AHRI-certified lab
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Proven Globally. Tailored for You.

The YORK® YVAA Air-cooled Chiller has been proven globally in some of the world's most challenging conditions. With a patented, liquid-cooled, variable-speed drive that produces 15-25% annual energy savings, IPLV as high as 21.3 EER, and up to 0.25 kW/TR reduction in energy use when replacing existing chillers, YORK® has the experience to tailor and tune the YVAA specifically for you.
Doctor attending a patient



Reduce annual energy costs as much as 50% with a liquid-cooled, variable-speed drive for lowest kW/ton at design and off-design conditions.


An efficient motor design provides a wide operating range while refrigerant cooling and thermal protection increase compressor reliability.


The YVAA can be tailored and tuned to match the capacity, efficiency, sound and footprint of specific applications.


  • Patented YORK® liquid-cooled, variable-speed drive technology
  • Patented, stepped VI (volume ratio) technology to match compressor operation to conditions
  • Class-leading standard operating range of -10°F to 131°F
  • Screw compressors designed and manufactured by Johnson Controls
  • Reduced energy consumption through reduced refrigerant compression
  • Patented hybrid falling film evaporator and microchannel condenser coil

Quick Start

After power is interrupted, it can take a standard chiller up to 10 minutes to restart. But with the Quick Start feature, YVAA chillers can restart within seconds after power is restored. YVAA chillers feature an industry-leading compressor restart (upon power being restored) of 34 seconds.

Because YVAA chillers contain a variable-speed drive, there is no inrush of current. As a result, all compressors can be started together. This allows a faster ramp-up to full capacity than possible with a typical chiller.
Learn About Quick Start
Graphic displaying the quick start feature on a YORK YVAA VSD Screw Chiller.
A view inside the doors of a Liquid Cooled YVAA VSD Screw Chiller.

Variable-speed Drive

VSDs help reduce energy consumption – particularly at off-design conditions – and can help lower annual energy costs as much as 50%. Our patented, liquid-cooled VSDs also require less maintenance, with glycol replacement required only every five years. And the variable-speed design dramatically reduces sound levels at off-design conditions – up to 16 dBA. Designed and manufactured by Johnson Controls, a 100% liquid-cooled VSD is standard on the YVAA.

Proven Compressor Technology

The YVAA incorporates advanced, patented variable volume index (VI) technology in a proven design. Our VI design optimizes the compression ratio of the compressor to match the conditions between the evaporator and condenser. This optimized compression ratio prevents over-compression to minimize energy consumption. Every compressor is run-tested at the end of the production line to ensure reliable operation.
Close up shot of the compressor technology used in a YORK YVAA VSD Screw Chiller

Technical Resources


YVAA Engineering Guide



Seismic Certified Chillers Flyer



YVAA Brochure



Video – Maximize Chiller Uptime with Quick Start



YORK® Fluid-to-air Microchannel Heat Exchangers Flyer



Air-Cooled and Condensing Units Line Card



YVAA/YVFA Quick Start Brochure




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