Variable air volume system

Claim 1

In an air processing system for conditioning air enclosure of the type including an air mover, thermostatic means for sensing the temperature of said enclosure, a first deck, a second deck and duct means for interconnecting said enclosure and said air mover, said duct means having a first passage and a second passage communicating with said first deck and said second deck, respectively, an improvement comprising, in combination: a shaft rotatably mounted to said duct means, said shaft extending substantially through said first passage and said second passage and beyond said duct means to define a shaft control portion, said shaft including a shaft actuating arm secured to said shaft control portion; a first damper element secured to said shaft within said first passage; a tube rotatably mounted on said shaft, said tube extending substantially through said second passage and beyond said duct means to define a tube control portion, said tube including a tube actuating arm secured to said tube control portion; a second damper element secured to said tube within said second passage; stop means for detachably securing said shaft and said tube in a first shaft position and a first tube position, respectively; drive means for driving said first damper element and said second damper element in response to said thermostatic means, said drive means including a shaft drive arm and a tube drive arm adapted to engage said shaft actuating arm and said tube actuating arm, respectively, said shaft, said tube and said drive means cooperatively defining attachment means for detachably securing said shaft actuating arm and said tube actuating arm to said shaft drive arm and said tube drive arm, respectively; and volume control means for variably operating said air mover in response to said first damper element and said second damper element; said shaft and said tube being operable in a first mode wherein said shaft actuating arm is detachably secured to said shaft drive arm and said tube is detachably secured in said first tube position by said stop means, a second mode wherein said shaft actuating arm and said tube actuating arm are detachably secured to said shaft drive arm and said tube drive arm, respectively, and a third mode wherein said shaft is detachably secured in said first shaft position by said stop means and said tube actuating arm is detachably secured to said tube drive arm.