JPS6433465A - Hot water supplier - Google Patents

Abstract

PURPOSE:To obviate the need for a detecting sensor for the temp. of supply water required to control by installing a feedforward control means controlling automatically the heating amount of a burner to a heat exchanger into a computed heating value and a feedback control means controlling automatically and finely the heating value of the burner so as to bring the detected temp. of hot water supply into a set temp. of hot water supply. CONSTITUTION:In a feedforward control circuit 4A installed in a controller 4 the heating demand G to bring the temp. to of hot water supply to a set temp. tx of hot water supply designated by a control switch 23 for the temp. of hot water is computed on the basis of the supply water amount Q to a heat exchanger 1 detected by a sensor 8 for the amount of water and the temp. ti of supply water. In order that the heating amount is controlled to the computed one and the detected temp. to of hot water supply is brought into the set temp. tx on the basis of the deviation between the temp. to detected by a sensor 11 for the temp. of hot water supply and the set temp. tx of hot water supply in a feedback control circuit 4B and its condition is maintained, both the circuits 4A, 4B control automatically and finely a proportional valve 21 controlling finely the heating G of a burner 2 and the rotating speed of a fan 3.