Air conditioning system with one pipe heating and cooling

Claim 1

AN AIR CONDITIONING SYSTEM FOR A SPACE HAVING A PLURALITY OF AREAS WITH SIMILAR HEATING AND COOLING REQUIREMENTS, A COMPRESSOR, AN EVAPORATOR, AND A CONDENSER INTERCONNECTED TO PROVIDE A REFRIGERATION SYSTEM, A FIRST CONDUIT FOR CONDUCTING HOT FLUID FROM SAID CONDENSER TO SAID AREAS, A SECOND CONDUIT FOR CONDUCTING COLD FLUID FROM SAID EVAPORATOR TO SAID AREAS, A THIRD CONDUIT FOR CONDUCTING HOT FLUID FROM SAID AREAS BACK TO SAID CONDENSER, A FOURTH CONDUIT FOR CONDUCTING COLD FLUID FROM SAID AREAS BACK TO SAID EVAPORATOR, AT LEAST ONE HEAT EXCHANGE UNIT IN EACH OF SAID AREAS, SAID HEAT EXCHANGE UNIT HAVING A COIL THEREIN, A FIFTH CONDUIT CONNECTED TO SAID FIRST CONDUIT AND SAID THIRD CONDUIT, A SIXTH CONDUIT CONNECTED DIRECTLY TO SAID SECOND AND FOURTH CONDUITS, FIRST CONDUIT MEANS CONNECTED TO SAID FIFTH CONDUIT TO CONDUCT HOT FLUID FROM SAID FIFTH CONDUIT THROUGH SAID HEAT EXCHANGE COIL AND BACK INTO SAID FIFTH CONDUIT, SECOND CONDUIT MEANS CONNECTED TO SAID SIXTH CONDUIT TO CONDUCT COLD FLUID FROM SAID SIXTH CONDUIT THROUGH SAID HEAT EXCHANGE COIL AND BACK INTO SAID SIXTH CONDUIT, AND VALVE MEANS OPERABLY CONNECTED TO SAID FIRST AND SECOND CONDUIT MEANS TO SELECTIVELY CONTROL THE FLOW OF HOT AND COLD FLUID VIA SAID FIRST AND SECOND CONDUIT MEANS RESPECTIVELY TO AND FROM SAID COIL IN RESPONSE TO LOAD CONDITIONS IN SAID AREA.