May 08 2020 · Basic combustion safety equipment includes a manual emergency stop combustion starter a low gas-pressure switch a high gas-pressure switch and a pressure switch. The Combustion Safeguard. The ignition-trial timer may be integral to the safeguard a stand-alone component or a function of a PLC.
A boiler typically uses a fuel such as natural gas propane or fuel oil in a vented combustion chamber much like a furnace. Whereas a furnace directly transfers heat from combustion to supply air in the air distribution unit a boiler heats a secondary transfer fluid (typically water but sometimes steam) that is in turn pumped through a radiation/convection system located throughout a building or home.