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Control system for refrigerating apparatus

  • US 5,224,354 A
  • Filed: 10/19/1992
  • Issued: 07/06/1993
  • Est. Priority Date: 10/18/1991
  • Status: Expired due to Fees
First Claim
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1. A control system for controlling a refrigerating apparatus including a compressor of capacity controllable type, a condenser, an expansion valve having a controllable opening degree, an evaporator and a refrigerant feeding pipe which connects the above components with each other, said control system comprising:

  • a control unit for measuring a super heat amount of a discharge gas of the compressor at the time immediately before starting operation and after starting operation of the compressor and for controlling an opening degree of the expansion valve in such a manner that in the case where said super heat amount measured immediately before starting operation of the compressor is higher than a preset value, the opening degree of said expansion valve at the time of starting operation of the compressor and at the succeeding time is controlled to a degree for usual operation, and in the case where said super heat amount measured immediately before starting operation of the compressor is lower than the preset value, the opening degree of said expansion valve is increased to a large opening degree larger than that for the usual operation at the time of starting operation of the compressor and then changed over to the opening degree for the usual operation when the super heat amount measured after starting operation of the compressor becomes higher than the preset value.

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