Abstract: A method and apparatus for proving a demand for air conditioning or heating upon startup of an air conditioning unit before the unit is allowed to effect heat transfer. A separate thermal sensing unit is provided in the return air to prove a demand for cooling prior to the conventional thermostat of the unit being energized to operate the unit in the normal manner. This method and apparatus prevents energy waste and unnecessary cycling at startup and low load conditions.

Abstract: An apparatus and method for operating an air conditioning unit incorporating both an economizer and a two speed fan are described. When the economizer is in operation the fan is typically operated at high speed regardless of refrigeration circuit operation to circulate sufficient outdoor air to the enclosure. When the economizer is closed, indicating the outdoor air is too warm to provide cooling to the enclosure, the fan is typically operated at low speed saving fan energy. An override control is provided for operating the fan at high speed regardless of the outdoor temperature should sufficient cooling demand be detected.

Abstract: Apparatus and a method for securing capillary tubes and other small diameter components within a refrigeration machine. A capillary plug button having a retainer plate in which various small diameter components may be secured has extending therefrom a pair of fastening legs. The fastening legs are inserted through an opening within an internal wall of the refrigeration machine such that projections on the legs contact one side of the wall and the retainer plate contacts the opposite side of the wall thereby securing the plug button within the opening and securing the small diameter components within the retainer plate. The retainer plate has a slot connecting the edge of the plate to a plurality of apertures thereby allowing the plug button to be spread apart such that the components may be inserted into the apertures of the retainer plate.

Abstract: Apparatus and a method for securing capillary tubes and other small diameter components within a refrigeration machine. A capillary plug button having a retainer plate in which various small diameter components may be secured has extending therefrom a pair of fastening legs. The fastening legs are inserted through an opening within an internal wall of the refrigeration machine such that projections on the legs contact one side of the wall and the retainer plate contacts the opposite side of the wall thereby securing the plug button within the opening and securing the small diameter components within the retainer plate. The retainer plate has a slot connecting the edge of the plate to a plurality of apertures thereby allowing the plug button to be spread apart such that the components may be inserted into the apertures of the retainer plate.