Patent ID: 7836718

Claim:
A method of defrosting an evaporator in a cooling system that includes a compressor, a condenser, an evaporator and a refrigerant that is circulated in sequence from the compressor to the condenser, to the evaporator and back to the compressor during routine operation of the cooling system, the method comprising: shutting off the flow of the refrigerant from the compressor to the evaporator through the condenser while continuing to operate the compressor so as to apply suction to the refrigerant in the evaporator; turning off the compressor for a period of time and circulating the refrigerant between the compressor and the evaporator while bypassing the condenser; and directing compressed refrigerant from the compressor to the evaporator while bypassing the condenser and continuing to shut off the flow of the refrigerant from the compressor to the evaporator through the condenser.