Abstract: A package air conditioning unit includes a housing, a condenser portion including a condenser located in the housing and an evaporator portion located in the housing. The evaporator portion includes an evaporator in fluid communication with the condenser and a vane-axial flow fan rotatable about a fan axis to power airflow from a conditioned space, across the evaporator and back toward the conditioned space.

Abstract: A refrigeration system including a first compressor and a second compressor, operating in tandem, wherein the first compressor includes a compression capacity different than the compression capacity of the second compressor. A method for operating a refrigeration system including a first compressor and a second compressor operating in tandem; wherein the first compressor comprises a first compression capacity and the second compressor comprises a second compression capacity larger than the first compression capacity the method comprising the steps of: determining a cooling demand; operating the first compressor in a first stage of cooling; operating the second compressor in a second stage of cooling; and operating the first compressor and the second compressor in a third stage of cooling.

Abstract: An air conditioning unit is provided including a base pan having at least one hole surrounded by a first embossment including a first inclined sidewall and a first top wall. A mounting plate is positioned adjacent a portion of the base pan. The mounting plate has at least one opening surrounded by a second embossment including a second inclined sidewall and a second top wall. The at least one opening is generally aligned with the at least one hole. The second embossment overlays the first embossment such that a gap exists between the second inclined sidewall and the first inclined sidewall.

Abstract: A refrigeration system including a first compressor and a second compressor, operating in tandem, wherein the first compressor includes a compression capacity different than the compression capacity of the second compressor. A method for operating a refrigeration system including a first compressor and a second compressor operating in tandem; wherein the first compressor comprises a first compression capacity and the second compressor comprises a second compression capacity larger than the first compression capacity the method comprising the steps of: determining a cooling demand; operating the first compressor in a first stage of cooling; operating the second compressor in a second stage of cooling; and operating the first compressor and the second compressor in a third stage of cooling.

Abstract: An air conditioning unit is provided including a base pan having at least one hole surrounded by a first embossment including a first inclined sidewall and a first top wall. A mounting plate is positioned adjacent a portion of the base pan. The mounting plate has at least one opening surrounded by a second embossment including a second inclined sidewall and a second top wall. The at least one opening is generally aligned with the at least one hole. The second embossment overlays the first embossment such that a gap exists between the second inclined sidewall and the first inclined sidewall.

Abstract: A method and apparatus for regulating an economizer damper using indoor fan air pressure is disclosed. The economizer control includes dampers powered by a motive source regulated by air pressure. An outdoor ambient thermostat and a mixed air thermostat are utilized to regulate the air pressure supplied to the motive source to effectively regulate the damper position.

Abstract: Apparatus and a method for providing a combination of non-reverse and reverse defrost for a refrigeration circuit are disclosed. A three-way valve is provided for initially circulating hot gaseous refrigerant directly from the compressor to the heat exchanger requiring defrost. An intermediate header is provided as part of the internal circuiting of the outdoor heat exchanger, said intermediate header serving to direct hot gaseous refrigerant from the three-way valve into all of the circuits of the outdoor heat exchanger simultaneously to effect defrost thereof. If, after a predetermined time period, the first mode of defrost directing hot gaseous refrigerant directly to the outdoor heat exchanger fails to accomplish defrost then the three-way valve is returned to its original position and the system is operated in a second defrost mode with the reversing valve being changed such that the system operates in the cooling mode and the outdoor heat exchanger serves as a condenser until defrost is completed.

Abstract: Apparatus and a method for providing a combination of non-reverse and reverse defrost for a refrigeration circuit are disclosed. A three-way valve is provided for initially circulating hot gaseous refrigerant directly from the compressor to the heat exchanger requiring defrost. An intermediate header is provided as part of the internal circuiting of the outdoor heat exchanger, said intermediate header serving to direct hot gaseous refrigerant from the three-way valve into all of the circuits of the outdoor heat exchanger simultaneously to effect defrost thereof. If, after a predetermined time period, the first mode of defrost directing hot gaseous refrigerant directly to the outdoor heat exchanger fails to accomplish defrost then the three-way valve is returned to its original position and the system is operated in a second defrost mode with the reversing valve being changed such that the system operates in the cooling mode and the outdoor heat exchanger serves as a condenser until defrost is completed.

Abstract: A method and apparatus for controlling a multiple compressor heat pump system such that when the system is in the heating mode of operation the compressors are cycled individually depending upon the ambient temperature level and are individually co-ordinately operated in a defrost mode. The electrical control means disclosed provides for a second compressor being energized when the outdoor heat exchanger of a first compressor is being defrosted and the first and second contact means located within the individual defrost circuits for the first and second outdoor heat exchangers such that when the first outdoor heat exchanger is being defrosted the second outdoor heat exchanger may not commence a defrost cycle and when the second compressor is being operated in a defrost cycle a first compressor may not commence a defrost cycle.

Abstract: Electrical control means for use in a heat pump system having dual compressors wherein the operation of each compressor can be staged independently and automatically except for those periods when the outdoor heat exchanger is undergoing defrost wherein both compressors are placed in operation.

Abstract: A reversible vapor compression system having control means associated therewith for automatically routing refrigerant through the heat exchangers in response to a system mode of operation to produce optimum system performance when the system is called upon to produce either heating or cooling.

Abstract: A heat exchanger for use in a reversible refrigeration system. The exchanger is divided into a plurality of heat transfer zones containing one or more circuits. Control means are provided to route refrigerant through each zone in a series progression when the heat exchanger is serving as a condenser. The flow geometry is automatically changed when the function of the exchanger is reversed from condenser to evaporator so that refrigerant flows simultaneously through each of the heat transfer zones.

Abstract: A reversible vapor compression system having control means associated therewith for automatically routing refrigerant through the heat exchangers in response to a system mode of operation to produce optimum system performance when the system is called upon to produce either heating or cooling.

Abstract: A heat exchanger for use in a reversible refrigeration system. The exchanger is divided into a plurality of heat transfer zones containing one or more circuits. Control means are provided to route refrigerant through each zone in a series progression when the heat exchanger is serving as a condenser. The flow geometry is automatically changed when the function of the exchanger is reversed from condenser to evaporator so that refrigerant flows simultaneously through each of the heat transfer zones.