Carrier Corporation

Glendon A Raymond

Herbert J Spath

Fred V Honnold

An apparatus and method for providing a refrigeration circuit and for effecting defrost are disclosed. Multiple outdoor heat exchangers are utilized to effect defrost of one of the outdoor heat exchangers while the other serves as an evaporator. In the refrigeration circuit disclosed, the indoor heat exchanger is not utilized during defrost and the outdoor heat exchangers are separated such that one is defrosted while the other serves as an evaporator. The circuit may then be reversed such that the non-defrosted outdoor heat exchanger is then defrosted while the other heat exchanger serves as an evaporator. This refrigeration circuit allows for effective defrost of the outdoor heat exchangers without necessitating electric resistance heat nor the transfer of heat energy from the indoor air to the outdoor heat exchangers.

Apparatus and method for defrosting a heat exchanger in a refrigeration

A method and apparatus for effecting capacity control of a compressor are described. The electric current to the compressor motor driving a variable step compressor is monitored. The subsequent operating current of the compressor is monitored and compared to the initial reference current value. Upon a predetermined variance between the reference current value and the current operating value being detected the capacity step of the compressor is increased to meet the additional load. Additionally there is provided other means for increasing the capacity step of the compressor including determining that an additional load on the refrigeration circuit has been energized and that the unit has been operating at a particular capacity step for a predetermined delay period. Means are disclosed for altering the capacity step of the compressor in response to any of the above occurrences indicating a need to increase the capacity step of the compressor.

Method and apparatus for controlling when to initiate an increase in

Apparatus and method for exchanging heat energy between a refrigeration circuit and a hot water system. Water is heated in a combination refrigerant desuperheater-water preheater and then conducted to hot water storage. A co-axial fitting is disclosed for mixing heated water from the refrigerant desuperheater-water preheater with water in a hot water tank prior to discharging that water to a hot water system.

Co-axial fitting for use with a refrigeration circuit heat reclaim

Apparatus and method for exchanging heat energy between a refrigeration circuit and a hot water system. A restricted flow by-pass line is used in conjunction with a pump continuously operated with the compressor of a refrigeration system such that a continual restricted flow of water by-passes the heat exchanger when temperature conditions are such that water is not flowing through the heat exchanger.

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Fulton, NY, United States of America

Glendon A Raymond