Control apparatus

Claim 1

IN A TEMPERATURE CONTROL SYSTEM FOR CONTROLLING THE TEMPERATURE IN A PLURALITY OF SEPARATE ZONES, CONDITIONING MEANS DELIVERING A SUPPLY OF HEATED MEDIUM TO SAID ZONES, FIRST MEANS ASSOCIATED WITH EACH ZONE CONTROLLING THE FLOW OF SAID MEDIUM TO EACH ZONE, TEMPERATURE RESPONSIVE MEANS IN EACH ZONE RESPONSIVE TO THE HEATING LOAD OF EACH ZONE, MEANS CONNECTING EACH OF SAID RESPONSIVE MEANS TO SAID FIRST MEANS OF A RESPECTIVE ZONE WHEREBY THE FLOW OF MEDIUM IS SELECTED TO SATISFY THE HEATING REQUIREMENTS OF EACH ZONE, A THERMAL SWITCH OPERATOR FOR EACH ZONE HAVING TWO HEATING WINDINGS, MEANS CONNECTING EACH OF SAID ZONE RESPONSIVE MEANS TO CONTROL THE ENERGIZATION OF ONE HEATING WINDING FOR EACH OF SAID SWITCH OPERATOR OF THE RESPECTIVE ZONE, CIRCUIT MEANS CONNECTING ALL OF SAID OPERATORS TO CONTROL SAID CONDITIONING MEANS, AND MEANS ASSOCIATED WITH ALL OF SAID SWITCH OPERATORS CONNECTED IN SERIES WITH SAID SECOND WINDING BIASING THE EFFECT OF SAID TEMPERATURE RESPONSIVE MEANS ON SAID MEANS DELIVERING HEAT WHEREBY SAID OTHER TEMPERATURE RESPONSIVE MEANS ARE INEFFECTIVE TO INFLUENCE SAID HEAT SUPPLY.