Control apparatus

Claim 1

IN A CONTROL CIRCUIT FOR CONTROLLING THE ENERGIZATION OF AIR CONDITIONING APPARATUS, FIRST RELAY MEANS HAVING AN ENERGIZATION WINDING AND A NORMALLY CLOSED SWITCH CONTROLLED BY SAID WINDING, SECOND RELAY MEANS HAVING AN ENERGIZATION WINDING AND BEING ADAPTED TO CONTROL THE AIR CONDITIONING APPARATUS, TIME DELAY MEANS HAVING A FIRST CIRCUIT WHICH CLOSES AFTER A PREDETERMINED PERIOD OF ENERGIZATION OF A WINDING OF SAID TIME DELAY MEANS, A SOURCE OF POWER, ELECTRICAL CIRCUIT MEANS CONNECTING SAID FIRST AND SECOND MENTIONED ENERTIZATION WINDINGS AND SAID FIRST CIRCUIT IN SERIES TO SOURCE OF POWER, CONDITION RESPONSIVE SWITCH MEANS, SAID CONDITION RESPONSIVE SWITCH MEANS OPENING UPON THE PRESENCE OF AN ABNORMAL CONDITION, ELECTRICAL MEANS CONNECTING SAID NORMALLY CLOSED SWITH AND SAID CONDITION RESPONSIVE SWITCH MEANS IN SERIES TO SHUNT SAID ENERGIZATION WINDING OF SAID FIRST RELAY MEANS SO THAT UPON THE PRESENCE OF AN ABNORMAL CONDITION SAID SHUNT CIRCUIT IS BROKEN TO PLACE SAID ENERGIZATION WINDING OF SAID FIRST RELAY MEANS IN SERIES WITH SAID ENERGIZATION WINDING OF SAID SECOND RELAY MEANS SAID ENERGIZATION WINDING OF SAID FIRST RELAY MEANS HAVING A HIGH EMPEDANCE THEREBY REDUCING THE CURRENT TO A PREDETERMINED LOW VALVE TO CAUSE SAID SECOND RELAY MEANS TO DE-ENERGIZE SAID CONDITIONING APPARATUS, SPACE TEMPERATURE RESPONSIVE SWITCH MEANS, AND ELECTRICAL CIRCUIT MEANS CONNECTING SAID TEMPERATURE RESPONSIVE SWITCH MEANS, SAID WINDING OF SAID TIME DELAY MEANS, AND SAID ENERGIZATION WINDING OF SAID FIRST RELAY MEANS IN A SERIES CURCUIT TO SAID SOURCE OF POWER TO MAINTAIN ENERGIZATION OF SAID FIRST RELAY MEANS, SAID LAST MENTIONED CIRCUIT NOT PROVIDING SUFFICIENT ENERGIZATION OF SAID TIME DELAY MEANS SO THAT SAID TIME DELAY MEANS SUBSEQUENTLY HAS AN OPEN FIRST CIRCUIT, SAID TEMPERATURE RESPONSIVE SWITCH MEANS PROVIDING A MEANS TO OPEN SAID LAST MENTIONED SERIES CIRCUIT TO DEENERGIZE SAID FIRST RELAY MEANS TO RE-ESTABLISH NORMAL OPERATION OF THE CONTROL CIRCUIT.