Refrigeration units are nowadays controlled and regulated by electronic controllers. Depending on the features of the device, these controllers perform a variety of complex tasks. It must be noted that the controllers themselves are very often a cause of problems. Much refrigeration damage is caused by faulty controllers or the peripherals associated with them (e.g. sensors). The controllers must therefore be designed to be as robust as possible and to be able to withstand the prevalent ambient conditions in terms of heat, cold and moisture (see Section 8.2).
A complete description of all operating modes, alarms and control characteristics would go beyond the scope of this work. Therefore, only the most important operating modes are outlined here.
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