Webster JB Series Installation, Startup, Operation And Maintenance Manual page 41

It is recommended that the burner be manually driven to
low fire before turning the burner off, as this reduces the
dynamic and thermal stress. If the burner will remain off
for some time, the manual fuel valves, fuel pumps and
power supply should be turned off.
CAUTION
ALWAYS KEEP THE FUEL SUPPLY VALVE SHUT OFF WHEN THE
BURNER IS SHUT DOWN FOR AN EXTENDED PERIOD OF TIME.
18. Restarting after Extended Shutdown
Extended shutdowns require the same startup process as
those outlined above. In addition, the following advanced
cleaning must be done,
a. The air atomized oil nozzle should be removed and
cleaned, if pressure atomized they should be replaced.
Use care in cleaning to preserve the sharp edges of the
nozzle, which are required to maintain good atomization.
b. The oil filter and strainer must be removed and cleaned
prior to starting.
CAUTION
DO NOT START THE BURNER UNLESS ALL CLEANOUT DOORS
ARE SECURED IN PLACE.
JB Manual
Page 41
Startup and Operating Adjustments