| 摘要 |
<p>A boiler control utilizing a pressure sensor (35, 36) is provided that operates the system in the low fire mode if the load is light, and can be satisfied in that mode. If the low fire operation is inadequate to hold the load and the pressure drops, the boiler (24) is then operated in a modulating mode which includes a high fire iimit. This is accomplished by sensing the variation of a pressure responsive means (22) and by providing a burner control system (23) that monitors that pressure responsive means</p> |
