| 摘要 |
PURPOSE:To ensure the ventilation by interlocking the stoppage of ventilation warning altering the need of ventilation with the signal of window opening. CONSTITUTION:The burning condition of a burner 1 of a fan heater is always monitored by a flame rod 3, and its sensing signal is amplified by an amplifier 4 to be compared with the reference value by a comparator 5. If oxygen becomes deficient and lower than the reference value in a room, the signal is outputted to a ventilation demand signal transmitter 6, which outputs a ventilation demand signal to a ventilation warning controller 7 to sound off a buzzer 9 by a buzzer actuator 8. In order for a user to stop the warning, a window 10 must be opened. That is, opening of the window 10 is detected by a sensor 12; this detection causes a window open/close signal transmitter 13 to send out the window open signal to a ventilation warning control means 7. Upon receiving the signal, the buzzer actuator 8 stops the operation of the buzzer 9. Therefore, the ventilation can surely be performed.
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