PURPOSE: To prevent a change of the hot water temperature due to the heat held by the castor by providing a hot water temperature sensor disposed in the water boiler and a controller that outputs a signal to stop the blower fan upon determining that the hot water temperature has dropped below the set temperature after receiving the burning stop signal.
CONSTITUTION: Prior to starting the boiler 1, the upper and lower limit A, B of hot water temperature and the set temperature T0 of hot water for the post-purge termination are entered. When the boiler 1 is started, the controller 3 sneds a signal to the fuel control valve 5 and blower fan 6 to start the burner 4 if the hot water temperature signal from the hot water temperature sensor 2 is below the lower limit temperature B. When the hot water temperature rises by the operation ofthe burner 4 to reache the upper limit temperature A, a signal is sent to the fuel control valve 5 and blower fan 6 to stop the burning. When the water temperatur decreases to become lower than the lower limit temperature B due to the stoppage of the burning, the burning is started is started in the afore-said manner, and the ON-OFF operation is repeated in the afore-said manner. In this instance, the operation stop signal from the controller 3 to the blower fan 6 is outputted after the water temperature has decreased lower than the set temperature T0 after the controller 3 was inputted with the burning stop signal from fuel control valve 5.
SUGAWARA MASARU
TASAKA EIJI
| JPS586224U | 1983-01-14 |