I recently had a Weil McLain boiler installed. Huge improvement over
the old coal converted asbestos coated boiler that I replaced.
I noticed that when the boiler begins to fire up, it runs for about 10
seconds before ingition. It also runs for about the same amount of
time when the flame goes out. Is this normal?
I haven't read the documentation on these boilers yet, but I believe there
is a time delay from when the burner starts, until that solenoid valve on
the left side of the gun opens, allowing oil to flow
Those are pre and post purge cycles. It runs the blower without the oil
on for 10 seconds to push fresh air into the combustion chamber,
potentially pushing out fuel vapors from a failed ignition cycle and
also getting the chimney draft flowing before ignition. It shuts off the
oil and continues the post purge blower cycle for 10 seconds to clear
remaining exhaust from the combustion chamber and chimney.
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