Air circulation system

Heating systems – Automatic control – Heat source is a reverse cycle refrigerating system or heat...

Reexamination Certificate

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Details

C454S229000

Reexamination Certificate

active

07059536

ABSTRACT:
An air circulation system for use with or without ductwork having an outside air stream and a return air stream includes a controller and a return damper apparatus operatively connecting the return air stream to the controlled environment. The air circulation system further includes a heating unit and an air mass sensor disposed adjacent to the return damper apparatus. The air mass sensor selectively and directly detecting a ventilation rate of air moving through the return damper apparatus and communicates the ventilation rate to the controller which selectively modulates operation of the heating unit in dependence upon the ventilation rate.

REFERENCES:
patent: 4364512 (1982-12-01), Morrison
patent: 4428529 (1984-01-01), Bentsen
patent: 4453419 (1984-06-01), Engelke
patent: 4817864 (1989-04-01), Payne
patent: 5005636 (1991-04-01), Haessig
patent: 5707005 (1998-01-01), Kettler et al.
patent: 5791408 (1998-08-01), Seem
patent: 6126540 (2000-10-01), Janu et al.
patent: 6227961 (2001-05-01), Moore et al.
patent: 6431457 (2002-08-01), Dirkes, II

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