Air conditioning system and pump controls therefor

Claim 1

IN AN AIR CONDITIONING SYSTEM INCLUDING FIRST AND SECOND ZONES TO BE CONDITIONED, A PLURALITY OF HEAT EXCHANGE UNITS IN EACH OF SAID ZONES, A FIRST CONDUIT MEANS FOR SUPPLYING A WAM HEAT EXCHANGE FLUID TO EACH OF SAID HEATE EXCHANGE UNITS IN EACH OF SAID ZONES, A SECOND CONDUIT MEANS FOR SUPPLYING A COLD HEAT EXCHANGE FLUID TO EACH OF SAID EXCHANGE UNITS IN EACH OF SAID ZONES, SEPARATE VALVE MEANS CONNECTED TO EACH OF SAID HEAT EXCHANGE UNITS AND TO SAID FIRST AND SECOND CONDUIT MEANS TO SELECTIVELY SUPPLY WARM OR COLD HEAT EXCHANGE FLUID TO SAID HEAT EXCHANGE UNITS AS REQUIRED, A HEATER, A COOLER, MEANS CONNECTING SAID HEATER TO SAID FIRST CONDUIT MEANS, MEANS CONNECTING SAID COOLER TO SAID SECOND CONDUIT MEANS, THE IMPROVEMENT COMPRISING: A FIRST COMMON RETURN CONDUIT MEANS OPERABLY CONNECTED TO EACH OF SAID HEAT EXCHANGE UNITS FO SAID FIRST ZONE FOR RETURNING SIMULTANEOUSLY SPENT WARM AND COLD HEAT EXCHANGE FLUIDS THEREFROM; A SECOND COMMON RETURN CONDUIT MEANS OPERABLY CONNECTED TO EACH OF SAID HEAT ECHANGE UNITS OF SAID SECOND ZONE FOR RETURNING SIMULTANELUSLY SPENT WARM AND COLD HEAT EXCHANGE FLUIDS THEREFROM; A FIRST PUMP OPERABLY CONNECTED TO SAID FIRST COMMON RETURN CONDUIT MEANS AND SAID HEATER; A SECOND PUMP OPERABLY CONNECTED TO SAID FIRST COMMON RETURN CONDUIT MEANS AND SAID COOLER; A THIRD PUMP OPPERABLY CONNECTED TO SAID SECOND COMMON RETURN CONDUIT MEANS AND SAID HEATER; A FOURTH PUMP OPERABLY CONNECTED TO SAID SECOND COMMON RETURN CONDUIT MEANS AND SAID COOLER; AND CONTROL MEANS FOR ENERGIZING SAID FIRST PUMP WHEN THE TEMPERATURE OF THE HEAT EXCHANGE FLUID IN SAID FIRST COMMON RETURN CONDUIT MEANS IS ABOVE A PREDETERMINED VALUE AND FOR ENERGIZING SAID SECOND PUMP WHEN THE TEMPERATURE OF THE HEAT EXCHANGE FLUID IN SAID FIRST COMMON RETURN CONDUIT MEANS IS BELOW A PREDETERMINED VALUE, AND FOR ENERGIZING SAID THIRD PUMP WHEN THE TEMPERATURE OF THE HEAT EXCHANGE FLUID IN SAID SECOND COMMON RETURN CONDUIT MEANS IS ABOVE A PREDETERMINED VALUE AND FOR ENERGIZING SAID FOURTH PUMP WHEN THE TEMPERATURE OF THE HEAT EXCHANGE FLUID IN SECOND COMMON RETURN CONDUITS MEANS IS BELOW A PREDTERMINED VALUE.