Method and apparatus for controlling when to initiate an increas

Details Method and apparatus for controlling when to initiate an increas Method and apparatus for controlling when to initiate an increas

1983-10-11

1985-01-22

Wayner, William E.

Refrigeration

Automatic control

Selective heating or cooling

62175, 622285, 417280, F25B 1300

Patent

active

044943822

ABSTRACT:
A method and apparatus for effecting capacity control of a compressor are described. The electric current to the compressor motor driving a variable step compressor is monitored. The subsequent operating current of the compressor is monitored and compared to the initial reference current value. Upon a predetermined variance between the reference current value and the current operating value being detected the capacity step of the compressor is increased to meet the additional load. Additionally there is provided other means for increasing the capacity step of the compressor including determining that an additional load on the refrigeration circuit has been energized and that the unit has been operating at a particular capacity step for a predetermined delay period. Means are disclosed for altering the capacity step of the compressor in response to any of the above occurrences indicating a need to increase the capacity step of the compressor.

REFERENCES:
patent: 3513662 (1970-05-01), Golber
patent: 3648479 (1972-03-01), Richardson

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