Low Pressure Boiler License Flashcards - Cram.com
used to remove air from inside the boiler. Should be opened when filling the boiler. Usually a 1/2" to 3/4" piping. Atmospheric pressure. 14. 7 PSI. Pressure Control. A switch that starts the burner, controls the firing rate, or shuts down the burner based on steam pressure. Pressure control should be mounted.