Zone load responsive optimizing control system

Claim 1

IN AN ENVIRONMENTAL TEMPERATURE CONTROL SYSTEM FOR A CONTROL ZONE HAVING A PLURALITY OF SPACES THEREIN, SAID SYSTEM INCLUDING A LIKE PLURALITY OF THERMOSTAT MEANS EACH CONTROLLING THE TEMPERATURE OF RESPECTIVE ONES OF SAID SPACES AND EACH GENERATING A CONTROL SIGNAL AS A FUNCTION OF THE HEAT EXCHANGE DEMAND OF A RESPECTIVELY ASSOCIATED SPACE, A SOURCE OF HEAT EXCHANGE MEDIUM, CIRCIRCULATING MEANS CONVEYING SAID HEAT EXCHANGE MEDIUM FROM SAID SOURCE TO SAID SPACES, AND MODULATING MEANS, INCLUDING AN INPUT, CONTROLLING THE DISCHARGE TEMPERATURE OF SAID HEAT EXCHANGE MEDIUM FROM SAID SOURCE INTO SAID CIRCULATING MEANS, THE COMBINATION OF SELECTOR MEANS, HAVING A PLURALITY OF INPUTS ADAPTED TO RECEIVE SAID CONTROL SIGNALS FROM SAID THERMOSTATS AND A SINGLE OUTPUT, SELECTIVELY TRANSMITTING FROMS SAID OUTPUT THAT CONTROL SIGNAL FROM SAID THERMOSTATS REPRESENTING THE MAXIMUM HEAT EXCHANGE DEMAND FROM SAID SPACES IN SAID CONTROL ZONE, AND AUTOMATIC CONTROLLER MEANS, HAVING AN INPUT AND AN OUTPUT CONNECTED AT ITS INPUT TO THE OUTPUT OF SAID SELECTOR MEANS AND AT ITS OUTPUT TO THE INPUT OF SAID DISCHARGE TEMPERATURE MODULATING MEANS, ACTUATING SAID MODULATING MEANS TO CONTROL SAID DISCHARGE TEMPERATRE OF SAID HEAT EXCHANGE MEDIUM AS A DIRECT FUNCTION OF THE MAXIMUM HEAT EXCHANGE DEMAND OF SAID CONTROL ZONE.