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Air cooled | Free Cool | DX | R134a

OptiChill™ & OptiChill™ FreeCool500kW - 1365kW

  • Air cooled
  • Free Cool
  • EC Fan
  • HFC R134A

OptiChill™ 500 – 1365kW meets large, diverse cooling loads with a low energy, low sound cooling solution designed to minimise environmental impact. A high efficiency, large capacity, air-cooled screw chiller, OptiChill™ (OPC) boasts a small footprint and a raft of flexible options suitable for a wide range of applications. OptiChill™ is ideal for Precision Air Conditioning, process and comfort cooling involving large, diverse cooling loads.

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.

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


  • ETL listed: Energy Technology List (all OPC models)
  • 52 models (OPC) and over 200 models (OFC)
  • Quiet and Extra Quiet ranges
  • Dual independent refrigeration circuits for resilience
  • Up to 95% free-cooling with OFC
  • 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 (OFC)
  • Intelligent head pressure control, optimises performance (OFC only)
  • 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