According to 46 CFR regulations pertaining to periodic tests and inspections as related to automatic auxiliary boilers, safety programming controls must be checked for proper operation, sequencing, and timing. What functions must be checked?

Correct Answer: Option B — Prepurge, ignition, postpurge, and modulation

Safety programming controls for automatic auxiliary boilers must be checked for proper sequencing of prepurge cycles, ignition trials, postpurge ventilation, and combustion modulation to guarantee safe furnace operation across all operating ranges.