ATC chillers have a temperature stability of +/-0.1°C. Some applications are
more sensitive to fluctuations in temperature and require increased
stability. Extra Close Control allows a temperature stability of +/-0.02°C
through an stepper-motor controlled hot gas bypass valve that continuously
balances a mix of hot gas and cold expanded refrigerant. In this process, the
movement of gases is gradually controlled, allowing for a more stable control
This option is currently available for K1-K9 chillers.
A low pressure switch is included to prevent the compressor from reaching
the vacuum. If you are running a standard temperature machine, the controller
will be limited to running at +4°C with a separate absolute low temperature
alarm to prevent freezing.