Refrigeration apparatus with defrost means

Claim 1

REFRIGERATION APPARATUS COMPRISING A FIRST CIRCUIT INCLUDING REFRIGERANT CIRCULATING MEANS CONNECTED TO AND ADAPTED TO CIRCULATE REFRIGERANT THROUGH A CONDENSER MEANS, A REFRIGERANT EXPANSION MEANS, AND AN EVAPORATOR MEANS; AND A SECOND CIRCUIT INCLUDING MEANS FOR CONTROLLING REFRIGERANT FLOW IN SAID SECOND CIRCUIT AND AUXILIARY COIL MEANS DISPOSED IN HEAT EXCHANGE RELATIONSHIP WITH SAID EVAPORATOR MEANS OF SAID FIRST CIRCUIT; SAID SECOND CIRCUIT BEING CONNECTED TO SAID FIRST CIRCUIT TO BYPASS SAID REFRIGERANT EXPANSION MEANS AND RETURN REFRIGERANT TO SAID REFRIGERANT CIRCULATING MEANS; A CONNECTION OF SAID SECOND CIRCUIT TO SAID FIRST CIRCUIT UPSTREAM OF SIAD REFRIGERANT EXPANSION MEANS AND DOWNSTREAM OF SAID CONDENSER MEANS COMPRISING A FIRST CONDUIT HAVING A SUBSTANTIALLY STRAIGHT PORTION WHEREIN ONE END OF SAID CONDUIT IS A PART OF SAID FIRST CIRCUIT AND THE OTHER END OF SAID CONDUIT IS A PART OF SAID SECOND CIRCUIT, A WALL OF SAID SUBSTANTIALLY STRAIGHT PORTION OF SAID FIRST CONDUIT HAVING AN APERTURE FORMED THEREIN, AND A SECOND CONDUIT SUBSTANTIALLY PERPENDICULAR TO AND CONNECTED TO SAID SUBSTANTIALLY STRAIGHT PORTION OF SAID FIRST CONDUIT AND COMMUNICATING WITH THE INSIDE OF SAID FIRST CONDUIT THROUGH SAID APERTURE FORMED IN THE WALL OF SAID FIRST CONDUIT; SAID SECOND CONDUIT CONDUCTING REFRIGERANT TO SAID EXPANSION MEANS WHEN THERE IS NO REFRIGERANT TO SAID EXPANSION MEANS WHEN THERE FLOW IN SAID SECOND CIRCUIT BEING OPERATIVE TO REDUCE PRESSURE AT AN INLET OF SAID EXPANSION MEANS BELOW THAT NECESSARY FOR APPRECIABLE REFRIGERATION THUS ALLOWING THE ENTIRE EVAPORATOR MEANS TO BE DEFROSTED.