Sindelfingen, Germany, 27 July 2021: Bitzer has added models with IP55 and IP66 enclosure classes to its range of Varipack frequency inverters. Making the announcement through a Press release, the company further said that the additions retain all of the product family’s known properties, such as user-friendliness, reliability and performance.

BITZER VARIPACK Images courtesy BITZER

According to Bitzer, the inverters are designed for safe and easy capacity control and have been specially adapted for refrigeration and for the operation of Bitzer refrigeration compressors. They open up a wide range of applications in supermarkets, hotels and restaurants as well as in food manufacturing and processing, the company said. The inverters, the company added, are suitable for refrigeration and air conditioning systems as well as for heat pumps and can be combined with single compressors and compound systems alike. After intuitive commissioning, the inverters take over the control functions of the refrigeration system, the company said. They can be mounted in a switch cabinet (IP20) or outside of the switch cabinet, thanks to the higher IP55/66 enclosure class, it added.

According to Bitzer, the inverters can be operated in two modes: The compressor’s capacity can either be controlled depending on an externally set signal or on the evaporation temperature with an optionally available pressure control add-on module. In addition to direct control of the evaporation temperature, the speed of the condenser fan can be set via a 0-10 V output signal, and a second compressor can be switched on, the company said. With regard to pressure control, the inverters have a database of all commonly used refrigerants for ease of configuration and monitoring, the company said.

According to Bitzer, its software can be used to select a frequency inverter for specific applications, and BEST software (Bitzer Electronics Service Tool) can be used for easy commissioning and monitoring. The stored databases simply select the compressor model to fully configure every compressor, the company said. BEST software is also the interface for communication to configure, monitor and read out error messages, the company said. The inverters, with the IP55/66 protection class, are also fitted with a display, as standard, which makes it possible to view the current operating conditions and adjust common parameters, the company added.

The inverters ensure that when operating in field-weakening mode, the maximum frequency is automatically limited, depending on the load, the company said. Optimised adjustment to suit the system’s current cooling demand, the company added, reduces energy consumption, increases efficiency and lowers running costs.