Multiple zone heating system

Claim 1

IN A TEMPERATURE CONTROL SYSTEM FOR A BUILDING HAVING FIRST AND SECOND SEPARATE ZONES, FURNACE MEANS FOR SUPPLYING A QUANTITY OF HEATED AIR TO SAID ZONES, INCLUDING TWO STAGE BURNERS EACH HAVING AN ELECTRICALLY OPERATED VALVE FORINDIVIDUALLY REGULATING ACTIVATION OF SAID BURNERS, CONDUIT MEANS FOR CONNECTING SAID FURNACE MEANS TO SAID ZONES TO DELIVER HEATED AIR THERETO FOR MAINTAINING THE TEMPERATURE OF EACH ZONE AT A PREDETERMINED VALUE, A THERMOSTAT IN EACH OF SAID ZONES RESPONSIVE TO THE TEMPERATURE OF THE AIR THEREIN TO PRODUCE A DEMAND SIGNAL WHEN THE AIR TEMPERATURE IN ITS ASSOCIATED ZONE IS BELOW A SELECTED LEVEL, FLOW CONTROL DAMPER MEANS IN SAID CONDUIT MEANS ADJUSTABLE TO A PLURALITY OF POSITIONS EACH OF WHICH ADMITS HEATED AIR TO AT LEAST ONE OF SAID ZONES INCLUDING A FIRST ZONE POSITION DELIVERING HEATED AIR SOLELY TO SAID FIRST ZONE AND A SECOND ZONE POSITION DELIVERING HEATED AIR SOLELY TO SAID SECOND ZONE AND A THIRD AIR DIVIDING POSITION INTERMEDIATE SAID FIRST AND SECOND ZONE POSITIONS DELIVERING HEATED AIR TO BOTH SAID FIRST AND SECOND ZONES IN PRESELECTED RELATIVE PROPORTIONS, A REVERSIBLE ELECTRIC MOTOR HAVING TWO SUPPLY VOLTAGE TERMINALS AND A REVERSING TERMINAL AND HAVING A ROTATABLE SHAFT ADJUSTABLE TO WITHER OF TWO ANGULARLY SPACED LIMIT POSITIONS AND ROTATABLE OVER A SELECTED ARCUATE RANGE THEREBETWEEN, MEANS INTERCONNECTING SAID MOTOR SHAFT WITH SAID DAMPER MEANS TO DRIVE SAID DAMPER MEANS TO SAID FIRST, SECOND AND THIRD DAMPER POSITIONS UPON ADJUSTMENT OF SAID MOTOR SHAFT TO ONE OF SAID LIMIT POSITIONS OR A SELECTED INTERMEDIATE POSITION THEREGETWEEN, AN ELECTRICAL CONTROL CIRCUIT MEANS INCLUDING A PAIR OF MULTICONTACT RELAYS EACH ENERGIZED RESPONSIVE TO A DEMAND SIGNAL FROM A RESPECTIVE ONE OF SAID THERMOSTATS, SAID RELAYS HAVING CONTACTS FOR COMPLETING A SUPPLY CIRCUIT TO SAID TWO SUPPLY VOLTAGE TERMINALS WHEN THE ASSOCIATED THERMOSTAT PRODUCES A DEMAND SIGNAL, AT LEAST ONE OF SAID RELAYS INCLUDING CONTACTS FOR APPLYING VOLTAGE TO SAID REVERSING TERMINAL TO CAUSE SAID MOTOR SHAFT TO ROTATE IN A REVERSE DIRECTION, AND MEANS INCLUDING ANOTHER RELAY RESPONSIVE TO DEMAND SIGNALS FROM ONE OF SAID THERMOSTATS AND OTHER CONTACTS OF SAID FIRST MENTIONED RELAYS FOR CONTROLLING SAID VALUES TO ACTIVATE ONLY ONE OF SAID STAGE BURNERS WHEN ONLY ONE OF SAID THERMOSTATS PRODUCES A DEMAND SIGNAL AND TO ACTUATE BOTH OF SAID STAGE BURNERS WHEN THE THERMOSTATS FOR SAID FIRST AND SECOND ZONES CONCURRENTLY PRODUCE DEMAND SIGNALS.