| 摘要 |
<p>The gas burning applianes comprises a main gas burner (6) in a boiler casing (2), an electrically-driven air fan (14), which is connected to the combustion chamber of the boiler, a heat exchanger unit (12) and a lighting jet (18) with a spark ignition electrode (20). The control apparatus includes gas valves (22, 24), an air flow sensor (28), a flame failure and detection circuit A, an electronic igniter circuit B and an electronic proving circuit C, which is a semiconductor switch triggered from the switch S3.</p> |
