Plural zone heating and cooling system

Claim 1

IN A SYSTEM OF THE FORCED AIR RE-CIRCULATION TYPE FOR COOLING FIRST AND SECOND ZONES, THE COMBINATION COMPRISING FIRST AND SECOND DUCTWORK SYSTEMS LEADING RESPECTIVELY TO SAID FIRST AND SECOND ZONES FROM THE OUTPUT OF A CONTINUOUSLY OPERATING AIR BLOWER MEANS, A MOTORIZED DAMPER UNIT IN EACH OF SAID DUCTWORK SYSTEMS FOR CONTROLLING AIR FLOW THERETHROUGH, INTERMITTENTLY OPERATIVE AIR COOLING MEANS IN HEAT EXCHANGE RELATION WITH THE AIR FORCED THROUGH SAID FIRST AND SECOND DUCTWORK SYSTEMS, A THERMOSTAT IN EACH SUCH ZONE FOR SELECTING THE TEMPERATURE DESIRED TO BE MAINTAINED IN EACH ZONE, MEANS RESPONSIVE RESPECTIVELY TO THE OPERATION OF EACH SUCH THERMOSTAT WHEN CALLING FOR COOLING TO EFFECT OPERATION OF SAID AIR COOLING MEANS AND TO EFFECT ACTUATION OF THE DAMPER UNIT IN THE PARTICULAR DUCTWORK SYSTEM APPERTAINING TO THE OTHER ZONE NOT REQUIRING COOLING TO A PRESET CLOSED POSITION AND TO CAUSE THE DAMPER UNIT APPERTAINING TO THE ZONE CALLING FOR COOLING TO MOVE TO OR REMAIN IN THE OPEN POSITION, AND MEANS RESPONSIVE WHEN BOTH OF SAID THERMOSTATS ARE SATISFIED AND SAID AIR COOLING MEANS IS NOT THEN IN OPERATION FOR MAINTAINING BOTH OF SAID DAMPER UNITS IN OPEN POSITION THEREBY TO MAINTAIN FULL CIRCULATION OF AIR FROM SAID BLOWER MEANS THROUGH BOTH OF SAID ZONES.