PILOT SYSTEMS
pilot atmospheric regulator (as close to mixer as possible)
mixture outlet
spark plug
observation port
spring adjusting cap
pilot tip
1/4 " steel tubing
gas inlet (take off from pilot gas safety train)
pilot mixture gas adjusting screw (limiting orifice)
pilot butterfly air valve
mixture pressure tap (check mixture near pilot tip)
size pilot air pipe to give at least 6 osi mixer inlet
pilot air-gas mixer (size mixer piping to lose no more than 5% of the mixture pressure)
air inlet (take-off well
upstream of main air control valve)
PILOT PIPING
The two most common causes of pilot problems are: Undersized piping
Plugging from dirt in the gas and air lines
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