ASME CSD-1 pdf download Controls and Safety Devices for Automatically Fired Boilers guarded: covered, shielded, fenced, enclosed, or other-wise protected by means of covers, casings, barriersrails, screens, mats, or platforms to prevent contact bypersons or objects. high fire: the rate of a burner at or near design maximumfuel input. ignifion sysfen, direcf: an automatic ignition system thatuses an electrically energized...