Blocked fan detection system for heat pump

Details Blocked fan detection system for heat pump Blocked fan detection system for heat pump

1993-12-10

1995-08-15

Gutierrez, Diego F. F.

Refrigeration

Processes

Defrosting or frost inhibiting

62156, 374 45, F25B 4100, F25B 4702, F25D 2106, G01N 2500

Patent

active

054408903

ABSTRACT:
A 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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