... weather conditions, with a quiet, low-vibration of screw compressor to reduce sound levels, it is also the ideal solutions ... 5ºC to 35ºC; 3.Bitzer semi-hermetic screw compressor, with optimal performance; 4.4 grade capacity control, 25 ... 216 Control Thermostatic expansion valve Safety devices Inner thermostat for compressor motor, unit overload relay,high and low pressure switch, freeze protection ...