| 摘要 |
PURPOSE:To enable a fan to be operated in an ordinary manner even if a reverse pressure, such as high wind, is exerted on an exhaust port, by a method wherein a device is constituted such that, when temperature in an exhaust cylinder is decreased to below a specified value, a temperature switch is actuated to increase the displacement of an exhaust fan to a maximum value. CONSTITUTION:An operation conrol circuit 18 properly changes a gas amount by actuating a gas controller 3 and displacement of exhaust gas by actuating a fan control circuit 19 by means of a temperature signal detected by a temperature sensor 12. A temperature switch 8 is set to 90 deg.C, and with the switch actuated, displacement of an exhaust fan 6 is increased to about a maximum value. If the open air reversely flows in an exhaust cylinder 7 by means of an outdoor strong wind when displacement is low, the temperature switch is actuated to increase displacement of the exhaust fan 6 to a maximum value. When the displacement is increased to about a maximum value, exhaust gas is increased in an exhaust pressure and a velocity, and the flow of exhaust gas is restored to a direction in which exhaust gas flows during ordinary combustion. |
