Control system for electrically heated boiler

Claim 1

A CONTROL SYSTEM FOR AN ELECTRIC HOT WATER HOUSE HEATING SYSTEM HAVING A BOILER, A PLURALITY OF ELECTRIC HEATING ELEMENTS MOUNTED WITHIN SAID BOILER TO HEAT THE WATER THEREIN AND PUMP MEANS FOR CIRCULATING THE WATER THROUGH A PERDETERMINED PATH IN THE ELECTRIC HOT WATER HOUSE HEATING SYSTEM, SAID CONTROL SYSTEM COMPRISING A SOURCE OF ELECTRICAL ENERGY UTILIZING ALTERNATING CURRENT AND MEANS FOR SELECTIVELY ENERGIZING AND DEENERGIZING SAID PLURALITY OF HEATING ELEMENTS AND SAID PUMP MEANS COMPRISING SWITCH MEANS FOR SEQUENTIALLY ENERGIZING IN A SINGLE COMPLETE CONTINUOUS OPERATION FIRST SAID PUMP MEANS AND THEN ONE BY ONE ALL OF SAID HEATING ELEMENTS AND SEQUENTIALLY DEENERGIZING IN A SINGLE COMPLETE CONTINUOUS OPERATION ONE BY ONE ALL OF SAID HEATING ELEMENTS AND THEN SAID PUMP MEANS, SAID SWITCH MEANS INCLUDING A PLURALITY OF SMALL DISPLACEMENT SENSITIVE SWITCHES, SOLENOID RELAY MEANS AND SEQUENTIAL SWITCH ACTUATION MEANS RESPONSIVE TO SAID RELAY MEANS FOR SEQUENTIALLY ACTUATING SAID SMALL DISPLACEMENT SENSITIVE SWITCHS, AN ELECTRICAL TRANSFORMER HAVING A PRIMARY AND A SECONDARY COIL, A ROOM THEREMOSTAT CONNECTED IN SERIES WITH THE SECONDARY COIL OF SAID ELECTRICAL TRANSFORMER AND THE SOLENOID OF SAID SOLENOID RELAY MEANS, A LIMIT CONTROL SWITCH, TEMPERATURE SENSING MEANS RESPONSIVE TO THE TEMPERATURE OF THE WATER IN THE BOILER FOR ACTUATING SAID LIMIT CONTROL SWITCH AT A PREDETERMINED MAXIMUM WATER TEMPERATURE, SAID