AK-PC 520 is used for capacity regulation of compressors or condensers in small refrigerating systems. There are eight outputs and up to 4 compressors and 4 fans can be coupled. Regulation is based on signals from one pressure transmitter for the compressor regulation and one pressure transmitter for the condenser regulation plus one temperature sensor for the air temperature before the condenser. The two pressure transmitters can be replaced by two temperature sensors when regulation has to be carried out on brine systems.
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