Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1995-06-06
1996-06-25
Tanner, Harry B.
Refrigeration
Processes
Defrosting or frost inhibiting
62129, 62156, F25B 4702
Patent
active
055289088
ABSTRACT:
The blocked fan or obstructed airflow condition is detected by measuring the difference between outdoor air temperature and outdoor exchanger coil temperature. If a very high difference is detected, or if no decrease in the difference is achieved after termination of the defrost cycle, and if either of these conditions persists over a plurality of defrost cycles, then the blocked condition is declared. The diagnostic system can be integrated in an existing demand defrost cycle and is capable of detecting blocked conditions attributable to foreign matter such as leaves, paper and debris which cannot be cleared by defrosting.
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Bahel Vijay
Herroon Gregory P.
Hickey Mickey
Millet Hank
Pham Hung
Copeland Corporation
Tanner Harry B.
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