Igniter Maintenance, Check/Adjust Z Dimension

Section: Nozzle Assembly Maintenance

C. 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 ohms.

The igniter should be replaced if the meter indicates an open circuit, or the spring-to-spring resistance exceeds the 480 - 480 ohms range by more than 10%.

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.

5.To replace the nozzle line assembly, reverse the above steps.

E.Check/Adjust “Z” Dimension

Refer to Figure 5. The critical “Z” dimension is the distance from the face of the nozzle to the ﬂat face of the head. This distance for F heads is 1-1/8”. The “Z” dimension is factory set for burners shipped with the air tube installed but should always be veriﬁed during service and installation. If the “Z” dimension is out of adjustment, perform the following steps.

Before proceeding, turn off power to the burner.

1.Disconnect the oil connector tube from the nozzle line.

2.Referring to Figure 4, loosen the splined nut (a) from the nozzle line. Loosen the hex head screw

(b)securing the escutcheon plate to the burner housing.

D. Servicing Nozzle Line Assembly

Before proceeding, turn off power to the burner.

1.Disconnect the oil connector tube from the nozzle line.

2.Referring to Figure 4, 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.

3.Remove the splined nut (b).

4.Remove the nozzle line assembly from the burner, being careful not to damage the electrodes or

Figure 4. Igniter Retainer Screws

3.A Beckett T650 gauge should be used to set the Z dimension.

4.Place the end of a ruler at the face of the nozzle and, using a straight edge across the head, measure the distance to the face of the head.

5.Slide the nozzle line forward or back until this dimension for F heads is 1-1/8”.

6.Tighten the hex head screw to secure the escutcheon plate to the burner chassis. Then tighten the splined nut and attach the oil connector tube.

7.Recheck the “Z” dimension periodically when servicing to ensure the escutcheon plate has not shifted. You will need to reset the “Z” dimension if you replace the air tube or nozzle line assembly.

The Beckett Z gauge (part number Z- 2000) is available to permit checking

the F head “Z” dimension without removing the burner.

Figure 5. ‘Z’ Dimensions Using Gauge

SK9787

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