Pilot turndown test n
This test is intended to check that the flame is correctly carried over to the main
burner when this unit detects the pilot flame if the gas pressure and air pressure are
changed to their worst conditions.
WARNING
To prevent an explosion trouble, carry out the pilot turndown test firmly. If this unit detects a small
pilot flame, which cannot ignite the main burner, it is determined that flame failure does not occur in
the flame safeguard control even though the flame failure occurs in the main burner. Thus, the fuel is
supplied continuously, causing an exposition accident, resulting in a serious hazard.
When performing the pilot turndown test repeatedly, stop the equipment completely every time the
pilot turndown test is completed in order to completely discharge the unburnt gas or oil accumu-
lated in the combustion chamber or flue.
If the unburnt gas or oil is not discharged completely, this may cause an explosion accident.
CAUTION
Only authorized personnel who have the technical skill about the combustion equipment and flame
safeguard control must carry out the mounting, wiring, inspection, adjustment, and maintenance
work.
Only authorized personnel who have the technical skill about the combustion equipment and flame
safeguard control must carry out the pilot turndown test.
For details about how to carry out the pilot turndown test, refer to the user's man-
ual for burner controller combined with this unit, as well as the instruction manuals
published by equipment manufacturers.
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