Electric control system for liquid heating apparatus of the pulse combustion type

An electric control system for a liquid heating apparatus of the pulse combustion type including a liquid vessel arranged to store an amount of liquid such as cooking oil or other fluid medium to be heated;

• a pulse combustion burner mounted to said vessel and having a combustion chamber secured at an inlet end thereof to a side wall of said vessel and immersed in the liquid;
• a tailpipe connected at one end thereof to an exhaust port of the combustion chamber and immersed in the liquid;
• and a fuel supply conduit in communication with a combustion chamber of said burner and being provided thereon with an electrically operated valve which is closed in a deactivated condition to interrupt the supply of fuel into the combustion chamber and opened in an activated condition to permit the supply of fuel into the combustion chamber;
• wherein the electric control system for the heating apparatus comprises a temperature sensor arranged to detect an instant temperature of the liquid in said vessel;
• memory means for memorizing a standard rate of temperature rise determined to be smaller than a rate of rise of the instant temperature detected by said sensor in a condition where a sufficient amount of liquid is stored in said vessel and to be larger than the rate of the rise of the instant temperature in a condition where there is no liquid in said vessel;
• means for comparing the rate of rise of the instant temperature with the standard rate of temperature rise and for producing an output signal therefrom when the rate of rise of the instant temperature is smaller than the standard rate of temperature rise;
• and means for deactivating said electrically operated valve in response to the output signal applied thereto.