PURPOSE: To repeat constant-time heating at the same time every day by providing a 1st timer control part which actuates a 1st timer and a 2nd timer control part which actuates 1st and 2nd timers.
CONSTITUTION: A microcomputer 15 when detecting the ON signal of a timer actuation switch 11 detects the time up to the start of heating set with a 1st variable resistor 16 to actuates the 1st timer 4 and also turn off a 1st relay 12. When the 1st timer 4 enters its time-up state, the relay 12 is turned on and the 1st timer 4 is actuated with a 24-hours set time; and the time up to the stop of the heating set with a 2nd variable resistor 17 is detected and the 2nd timer 5 is actuated. Then when the 2nd timer 5 enters its time-up state, the relay 12 is turned off. The 1st timer 4 enters the time-up state at intervals of 24 hours and the relay 12 is turned on repeatedly. The timer when the relay 12 is ON is controlled by the 2nd timer 5, so the relay is never ON continuously. Consequently, the constant-time heating can be repeated at the same time every day.
IWASA TAKASHI
KAMIMURA MASAHITO
KONISHI HIDEAKI
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