Introduction

A frequency inverter allows the stepless control of the cooling capacity to the cooling demand of the system by speed control. The following guidelines explain the design, operation, application range and special characteristics of

All Bitzer scroll compressors are suitable for operation above and below the connected supply frequency and can thus run over an exceptionally broad capacity range.

Features of the operation with a frequency inverter (FI):

The figure below shows the smaller temperature fluctuations with frequency inverter control:

With frequency inverter operation, the average evaporation temperature can be raised e.g. from -7 to -4.5°C. Rising the evaporation temperature by 1 K increases system efficiency by up to 3%.

Capacity control with frequency inverter (FI) compared to on/off and stepped mechanical regulation

Also observe the following technical documents