| 摘要 |
PURPOSE:To make it possible to secure a specified combustion quantity by detecting a change in pressure difference in a passage by a pressure sensor when a change in the volume of passing air occurs due to a gust, clogging in the supply and exhaust section, etc. and controlling the blast so as to bring it to a set volume by a feedback circuit in the control section. CONSTITUTION:A hot water temperature setting device D sets the temperature of the delivered hot water of a heat exchanger 34, and a water temperature sensor E detects the temperature of the water that flows into a heat exchanger 34. And, a flow rate detector F detects the volume of the water that flows into the heat exchanger 34. A required volume of gas and required volume of blast are set and they are set as standard values by calculating the output signals of those hot water temperature setting device D, water temperature sensor E, and flow rate detector F. And the volume of the blast in a combustion air (or mixture gas) channel is detected by the pressure difference generated in the channel as a passage pressure loss and detected by a pres sure sensor P, and at the same time the pressure difference signal is inputted to a control section C as an actual blast volume signal corresponding to it, and in the control section C the deviation between the standard blast volume signals and actual blast volume signal is corrected by a feedback circuit to control blast volume. |
