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Methods and apparatus for operating a refrigeration unit

  • US 5,596,878 A
  • Filed: 06/26/1995
  • Issued: 01/28/1997
  • Est. Priority Date: 06/26/1995
  • Status: Expired due to Term
First Claim
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1. A method of operating a refrigeration unit having a compressor driven by a liquid cooled prime mover, and an economizer cycle which enhances cooling and heating cycles initiated to control the temperature of a conditioned space to a predetermined set point temperature, with the enhancing of the heating cycle including adding heat to the economizer cycle from liquid used to cool the prime mover, comprising the steps of:

  • sensing the temperature of the liquid which cools the prime mover,initiating a heating cycle when required, when the sensing step detects the temperature of the liquid is above a predetermined value,and initiating a special refrigeration cycle when a heating cycle is required, prior to the step of initiating the heating cycle, when the sensing step detects the temperature is not above the predetermined value,said step of initiating the special cycle including the step of increasing the load on the prime mover, at least until the sensing step detects that the temperature of the liquid is above the predetermined value.

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