Method and apparatus for controlling pressure in a single compressor refrigeration system

摘要

Method and apparatus are disclosed for controlling the pressure in a single compressor refrigeration system, comprising a timer for establishing a selected time period functionally related to the compressor on-off cycle, a pressure detecting means for establishing and detecting an operating suction pressure range in the system for determining when upper and lower limits of the operating pressure range have been exceeded, means for generating a compressor turn-on signal in response to exceeding the upper limit of the operating pressure range, means for generating a compressor turn-off signal in response to exceeding the lower limit of the operating pressure range, and control means receiving the compressor turn-on signal for applying the turn-on signal to the compressor in response to the suction pressure exceeding the operating pressure range upper limit, the control means receiving the compressor turn-off signal and cooperating with the timer for preventing the application of the turn-off signal to the compressor only if the established time period has not elapsed. In some applications, the system may include a second timer for establishing a selected turn-on delay time period for cooperating with the control circuit and preventing the application of the turn-on signal to the compressor for the turn-on delay time period.