- Flame Programmer
A flame programmer is an
electrical ,electro-mechanical , or electronic device used to program the safe lighting offuel burning equipment, as well as the safe shut-down of theflame when it is not needed.These programmers are made with different time sequences to accommodate very small household
furnaces to mammoth industrialsteam boiler s and many other fuel burning processes in industry.A Typical Cycle
Pre-purge
During pre-purge, the combustion air fan is started and the
damper s are opened to allow fresh air into thecombustion chamber and exhaust any other gases or residualfuel air mixture s.Pilot Trial
In the pilot trial, the pilot
solenoid is opened and theignition transformer is turned on. The fuel is lit to make sure thepilot flame stays lit. There is a flame detection device that will shut down the thefuel valve if the flame fails or goes outMain Flame Trial
With the pilot still burning, the main burner valves are opened and the main flame is lit. The flame detection device here will also shut-down or close all the fuel valves if the flame is extinguished.
Run
The pilot valve is shut and the main burner is left on and burning. The flame detector remains operational to kill the fuel valves if the flame should fail.
Post purge
When the flame is no longer needed, the fuel valves are shut and the combustion air fan is left running to clear the combustion chamber of all unburnt fuel and products of combustion. The combustion air fan is shut down after a period of time.
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