TM 9-4520-272-14&P
0050 00
ADJUST
CAUTION
Do not make adjustments to the burner nozzle and electrode assembly until it is deemed
necessary after checking the alignment with the adjusting tool.
NOTE
An electrode gap adjusting tool is required for the proper adjustment of the burner nozzle
and electrode assembly. This tool is supplied with each heater and is permanently
tethered to the heater inside the fuel system access door, stowed inside the technical
manual storage bin. If the electrode gap adjusting tool is lost or damaged, it may be
reordered using information found in the RPSTL portion of this TM. As a field expedient,
a template is supplied at the end of this work package that can be printed, cut out, and
used in place of the tool. This tool is approved for local fabrication; an engineering
drawing is provided in the rear matter section of this TM to ensure that the tool is
fabricated to exact tolerances.
Checking position of the electrodes and nozzle.
1. Set the burner nozzle and electrode assembly (23) on a stable work surface with the burner cone with
swirlers (25) facing toward you.
2. Verify that all of the conditions listed below exist. If all conditions exist, the burner nozzle and
electrode assembly does not require adjustment. Proceed to the section of this work package entitled
SERVICE and performed the indicated tasks followed by INSTALL. If ANY of the conditions do not
exist, adjustment is required as detailed in the section below entitled "Adjusting the position of the
electrodes and nozzle".
3. Insert the supplied electrode gap adjusting tool (27) so that it falls between the tips (28 and 29) of the
two electrodes and the angled shoulders (30) of the tool are in contact with the inner ring (31) of the
burner cone with swirlers (25). Verify that the tip of the nozzle (32) is in contact with the end (33) of
the electrode adjusting tool without raising the adjusting tool off the inner ring (31) of the burner cone
with swirlers (25). Verify also that the center of the tip of the nozzle (32) is aligned with the center line
(34) of the adjusting tool (27). This line is labeled "C/L Nozzle" (C/L = Center Line).
4. Rotate the adjusting tool (27) 90 degrees and position the angled shoulders (30) of the tool so that
they are in contact with the inner ring (31) of the burner cone with swirlers (25). Verify again that the
center of the nozzle (32) is aligned with the center line (34) of the adjusting tool.
5. Move the adjusting tool (27) so that it is in contact with the tips of the electrodes (28 and 29) and
centered over the center of the nozzle (32). Verify that the tips of the electrodes (28 and 29) are
aligned with the two indicator lines (35 and 36) and that the electrodes are positioned the correct
distance from the end of the nozzle by verifying that the tips of the electrodes are aligned with the
horizontal lines (37 and 38) of the crosshairs.
Adjusting the position of the electrodes and nozzle.
NOTE
Two personnel or a holding device are recommended for this section of the maintenance
procedure as it will make the adjustment process easier.
0050 00-5
