OptiChill™ & OptiChill™ FreeCool

OptiChill™ & OptiChill™ FreeCool

OptiChill FreeCool 750 – 1365kW

The OptiChill FreeCool (OFC) is a large capacity, low energy R134a air-cooled screw chiller that meets diverse cooling loads with a flexible, low sound cooling solution.

More than 95% free-cooling over a year
Can save more than 50% of the energy consumed by a conventional chiller
Free-cooling EER’s* of up to 75
ESEER of up to 3.44

Units within this range are Ecodesign compliant for both process (SEPR)and comfort cooling (SSCEE) applications. Please refer to the technical manual, website, or your Airedale account manager for full details

Highly energy efficient, the OptiChill FreeCool offers more than 95% free-cooling over a year (cumulative hours, London, UK) and can save more than 50% of the energy consumed by a conventional chiller thus greatly reducing operational costs.

For up to 30% of the year, the OptiChill FreeCool can operate purely in free-cooling mode, leading to Free-cooling EER’s* of up to 75. During any mechanical cooling, excellent part load efficiencies ensure an ESEER (European Seasonal Energy Efficiency Ratio) of up to 3.44.

EER 3.21 ESEER up to 4.21

  • Free-cooling virtually all year round
  • Interactive head pressure setpoint management to achieve optimum EER
  • Efficient shell and tube evaporator with freeze protection offers high evaporating temperatures
  • Large surface area condenser coil with enhanced tube and fin for improved heat exchange and low noise
  • Two sizes of free-cooling coil (2 and 3 rows) for increased annual efficiencies
  • Electronic expansion valves increase ESEER by 30%
  • Automatic rescheduling of chilled water
  • Economisers, each with dedicated EEV, to enhance compressor performance at full and part load operation


  • Over 200 models
  • Quiet and Extra Quiet ranges
  • Dual independent refrigeration circuits for resilience
  • Up to 95% free-cooling
  • 12.5°C increase in operational evaporating temperature range allowing supply water temperatures to be increased, thus raising the free cooling threshold and giving enhanced compressor efficiency and reduced power input
  • Intelligent head pressure control, optimises performance
  • Latest fan technology reduces sound and power input
    8 stages of cooling for more precise capacity match
  • Large surface area condensing coils
  • High efficiency shell and tube evaporator
  • Large surface area condensing coils
  • High efficiency shell and tube evaporator


  • Modem link for remote monitoring
  • Leak detection system for F Gas compliance
  • Corrosion-resistant condenser coils for aggressive atmospheres
  • Coil guards to help prevent fin damage
  • Condenser fan air discharge plenum – choice of two heights
  • Anti-vibration mounts
  • Low ambient kit for operation in ambients as low as -30°C
Chiller Capacity Max EER Max ESEER Refrigerant Compressor Type Circuits
OptiChill Screw Chiller 500 – 1140kW 3.19 4.21 R134a Screw compressor Dual
OptiChill Free Cool 750 – 1330kW 3.12 3.48 R134a Screw compressor Dual

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