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Igniter Maintenance:
The igniter assembly does not require any adjustments beyond making sure the springs and the
burner electrode rods make solid contact when the igniter is in the closed position. The sealing
surfaces of the gaskets should be checked and replaced at the first signs of any damage or
deterioration. Clean any dirt or residue from the porcelain bushings, springs, and baseplate.
The simplest way to check igniter operation is by supplying voltage to the input and checking to see
whether an arc is produced. Check by either looking or listening to see if there is an arc across the
electrodes while the burner is running and the igniter is energized.
The igniter must be grounded to the burner before checking the following. To check the igniter,
ensure all power to the burner is off and use an ohmmeter to check the resistance between the two
springs. The meter should read between .480 - .580 ohm.
The igniter should be replaced if the meter indicates an open circuit, or the spring-to-spring
resistance exceeds the .480 - .580 ohm range by more than 10%.
Servicing Nozzle Assembly:
A. Before proceeding, turn off power to the burner.
B. Disconnect the diesel fuel connector tube from
the nozzle line.
C. Loosen the two screws securing the igniter
retaining clips (a) and rotate both clips to release
the igniter baseplate. Then tilt the igniter back on
its hinge.
D. Remove the splined nut (b).
E. Remove the nozzle line assembly from the
burner, being careful not to damage the
electrodes or insulators while handling. To ease
removal of short assemblies, it may be necessary
to loosen the escutcheon plate (c). Reset to the edge of the label.
F. To replace the nozzle assembly, reverse the above steps.
Replacing The Burner Nozzle:
A. Use rubber gloves and avoid touching the new nozzle with your bare fingers. The oils in your
skin can adversely affect the operation of the new nozzle.
B. Remove the plastic cover protecting the nozzle adapter threads.
C. Place a 3/4” open-end wrench on the nozzle adapter. Insert the nozzle into the adapter and
finger tighten with your gloved hand. Finish tightening with a 5/8” open-end wrench.
D. Verify that the electrode tip settings comply with the diagram below.
Check/Adjust Electrodes:
A. Check the electrode tip settings.
B. Adjust if necessary to comply with the dimensions
shown.
C. To adjust, loosen the electrode clamp screw and
slide/rotate electrodes as necessary.
D. Securely tighten the clamp screw when finished.
MA4 Maintenance - Tank Burner
Electrode Tip Settings