Method of detecting short cycling of air discharged by a refrige

Details Method of detecting short cycling of air discharged by a refrige Method of detecting short cycling of air discharged by a refrige

1993-02-25

1994-02-08

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62130, F25B 4900

Patent

active

052840247

ABSTRACT:
A method of monitoring a refrigeration unit including detecting premature return of air discharged into a conditioned space, and distinguishing this "short cycling" problem from a refrigeration capacity problem. The method includes determining the rates of change of the temperatures DA and RA of the discharge air and return air, respectively, during temperature pull down of the conditioned space, and comparing the rates of change with predetermined constants selected to detect a short cycling of the discharge air. When the rates of change do not fit a normal temperature pull down, the differential .DELTA.D between the temperatures DA and RA of the discharge air and return air is determined and compared with a third constant. Predetermined results of the comparisons of the rates of changes of DA and RA, and the temperature difference .DELTA.D with the first, second and third constants, respectively, are utilized to identify proper air flow in conditioned space, to indicate a problem with air flow in conditioned space, and to indicate that refrigeration capacity should be checked.

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