CONDENSATION PREVENTION CONTROLLER OF HOT WATER CIRCULATION BOILER

摘要

PROBLEM TO BE SOLVED: To prevent condensate from forming on an heat exchanger caused by lowering of temperature of return hot water in a hot water circulation boiler. SOLUTION: In a hot water-circulation boiler 1 provided with a burning equipment 14 and a heat exchanger 13 which is connected to a radiator 4 through a circulation circuit 7 for hot water to circulate, a return-water temperature sensor 20 is provided to the downstream side to detect the temperature of hot water of which heat is dissipated in the radiator 4. When the sensor 20 detects continuously for a set period of time a prefixed or lower temperature at which condensation will occur on the heat exchanger 13, the burning rate of the burning equipment 14 is increased to prevent condensation from taking place.