CIRCULATION PUMP CONTROL METHOD FOR GAS BOILER

摘要

The method and apparatus continuous to drive the circulation pump during a set period although the water level float switch turns off during a freeze-prevention operation in order to prevent the remaing water from freezing. The circulation pump controller comprises a timer (112) driven by an output signal generated from an oscillator (12); a temp. detector (113) detecting a freeze-prevention start temp. by receiving the signals from the timer (112) and the themister (113); a water level sensor (117) receiving the signal from the float switch (31); a next step command part (114) ordering the next drive function by receiving the signals from the temp. sensor (113) and the water level sensor (117).