Azbil AUR450C - Minimum Pilot Flame Ignition Check

4-4
Chapter 4. TRIALRUN ADJUSTMENT
(5) Close the manual valve for the pilot burner slowly.
The pilot flame gradually becomes smaller. Gradually close the valve until the
AUD300C/500C cannot detect the flame.
(6) FLAME LED goes out, and the system is locked out. Record the gas pressure
just before the lockout.
z Check that the main burner ignites with the minimum pilot flame
(7) Open the manual valve for the pilot slowly to adjust the pressure to a level im-
mediately before the combustion lamp goes off.
(8) Reset this device and turn ON the start contact again to ignite the pilot.
(9) Check that the main burner ignites smoothly within 1 second after the manual
valve for the main burner has opened.
(10) Change the gas pressure level between the minimum and maximum levels and
ignite the main burner five or six times. Be sure that the main burner ignites
smoothly every time.
z If the main burner does not ignite with the minimum pilot flame
(11) Adjust the mounting position of the AUD300C/500C and the amount of in-
coming light so that the AUD300C/500C cannot detect a pilot flame that can-
not ignite the main burner.
There are two kinds of adjustment procedures.
• Move the monitoring area of the sighting pipe slightly away from the pilot
flame.
• Narrow the sighting pipe to decrease the incoming light amount from the
pilot flame.
(12) Open the manual valve for the pilot burner slowly to make the pilot flame
larger than the previous flame.
z After adjustment, check again that the main burner ignites with the minimum pilot flame
(13) Perform steps 7 to 10 to be sure that the main burner still ignites with the
minimum pilot flame.
z Measures to be taken after completion of the test
(14) After the test has been completed, return the manual valve of the main burner
to its fully open position.
(15) Check that the flame voltage is correct.
(16) If any limit switch has jumper cables attached, disconnect them to return the
limit switch to its previous state.