Air sensing control system for air conditioners

Claim 1

In a unitary air conditioning unit for conditioning the air in an enclosure including a housing, a partition within said housing dividing said housing into interior and exterior chambers, an outdoor heat exchanger arranged in said exterior chamber adjacent an outlet in said housing, an indoor heat exchanger arranged in said interior chamber, a fan motor arranged in said portion including a fan means in a said exterior chamber for circulating outdoor air through said external chamber, and a fan means in said interior chamber for circulating enclosure air through said chambers; reversing means for electrically changing rotational direction of air flow through said chambers; a vent opening in said partition, a damper including electrically operated means for moving said damper between a closed and open position for allowing an exchange of air between said chambers; an air sensing system in said air conditioning unit comprising: sensing means located in said housing for sensing the level of humidity and concentration of gases in the air circulating said enclosure, having a first condition for generating electrical signals having values indicative of the level of humidity in said circulating enclosure air contacting said sensing means, and a second condition for generating electrical signals having values indicative of a first level of concentrations of gases in the circulating enclosure air, and a third condition for generating electrical signals having values indicative of a second level of concentration of gases in said circulating enclosure air; and decision means operable in said first condition for causing said electrically operated damper means for moving said damper to an open position and for causing said reversing means to set rotational direction of said fan motor so that said fan means are operable for introducing outdoor air to said interior chamber to be mixed with said enclosure air; decision means operable in said second condition for causing said reversing means to set rotational direction of said fan motor so that said fan means are operable for exhausting enclosure air into said circulating outdoor air; and decision means operable in said third condition including warning means operable when the level of concentration of gases in the circulating enclosure air is greater than the correction capability of the system; warning means operative for producing user discernable signal when the level of concentration of gases in the circulating enclosure air increases above a predetermined level.