EWAD-BZSL is an air-cooled screw inverter chiller with standard efficiency and low sound level. With maximum European seasonal energy efficiency ratio 4.7, it is optimized to be used with R-134a and comes with 2 completely independent refrigerant circuits. All models of EWAD-BZSL are approved by PED pressure vessel. Tube evaporator and DX shell with one pass refrigerant side minimize pressure drops. The output power can be varied in direct relation to its cooling needs, which enables EWAD-BZSL to attain building-comfort conditions at much faster rate at start-up. Available with total and partial heat-recovery option the device has standard electronic expansion valve, with minimum standard operation temperature -12°C and power factor over 0.95.