Patent ID: 6250382
Filing Date: 2001-06-26
Classification: F24F

Abstract:
A system for conditioning air within one or more zones, comprising:a conditioning unit having a heating stage, a cooling stage, and a fan, the fan selectively operable to move air through at least one of the heating and cooling stages and to provide supply air to the one or more zones;an economizer operable to selectively supply variable amounts of outdoor air to the conditioning unit;a supply temperature sensor exposed to the supply air to sense the temperature of the supply air;an indoor temperature sensor exposed to the air in at least one of the one or more zones to sense the temperature of the air within the one or more zones; anda central control coupled with said sensors, conditioning unit, and economizer, the control selectively operating at least one of the heating stage, the cooling stage, and the economizer when the sensed temperature of the air in the one or more zones is outside of a first predetermined temperature range and further selectively operating at least one of the heating stage, the cooling stage, and the economizer when the sensed temperature of the air in the one or more zones is within the first predetermined temperature range and the sensed temperature of the supply air is outside of a second predetermined temperature range.