Patent ID: 9551335
Date: 2017-01-24
CPC Classifications: F04B,F25B

Claim:
1. A method for coordinating operation between at least two groups of compressors in a cooling circuit, a first group of compressors forming part of a low temperature (LT) part of the cooling circuit and a second group of compressors forming part of a high temperature (MT) part of the cooling circuit, each of the compressor groups comprising one or more compressors, and each of the compressor groups comprising a controller, the controllers being configured to exchange signals, the method comprising the following steps: investigating whether or not one or more of the MT compressors is/are operating, in the case that one or more of the MT compressors is operating, allowing one or more of the LT compressors to start operation, in the case that none of the MT compressors is operating: wherein the step of operating the MT compressors and the LT compressors comprises the step of in the case that the suction pressure in the MT part of the cooling circuit is below the lower limit of the neutral pressure zone, starting at least one of the LT compressors, while preventing the MT compressors from starting.