Air conditioner filter monitor

Details Air conditioner filter monitor Air conditioner filter monitor

1993-08-16

1994-05-31

Tapolcai, William E.

Refrigeration

With indicator or tester

Condition sensing

55274, 116272, 116DIG25, F25B 4900

Patent

active

053158385

ABSTRACT:
A filter monitor for indicating the condition of an air filter in a room air conditioner to determine whether the filter is clogged. The filter monitor assembly includes a shell mounted on the front of the air conditioner, with an air pressure equalization passage permitting air flow through the shell when a clogged air filter creates a negative air pressure inside the air conditioner housing. A signal flag within the shell is normally retracted by the force of gravity, but is visibly extended outside the shell by the pressure-induced air flow through the shell, indicating that the air filter is clogged.

REFERENCES:
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patent: 3263403 (1966-08-01), Ladusaw
patent: 3635001 (1972-01-01), Komroff et al.
patent: 4020525 (1977-05-01), Fromknecht et al.
patent: 4416033 (1983-11-01), Specht
patent: 4445456 (1984-05-01), Nelson
patent: 4688511 (1987-08-01), Gerlach et al.
patent: 4747364 (1988-05-01), Horowitz
patent: 5046406 (1991-09-01), Harris et al.

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