TM 5-4520-256-14
3-38. ELECTRODE MAINTENANCE.
This Task Covers:
a.
Removal
b.
Inspection
c. Cleaning
d. Installation
INITIAL SETUP:
Tools Required:
Tool Kit, General Mechanics
Materials Required:
Cleaning Solvent (Item 11, Appendix E)
WARNING
Cleaning solvent, Federal specification P-D-680, is toxic and flammable. Use only in a well-
ventilated area. Avoid prolonged breathing of fumes. Keep solvent away from flames. Do not
use in excessive amounts. Avoid skin contact.
Equipment Conditions:
Heater unit shut down and cool.
Power cable disconnected from power source.
Air filters and access door removed (para 3-10a).
Flame detector removed (para 3-37a).
a. Removal.
(1) Disconnect fuel line (1) from nozzle (2).
(2) Disconnect ignition leads from both electrodes (7 and 10).
(3) Remove eight nuts (18), eight lockwashers (19), and eight flat washers (20).
(4) Remove burner (14) and gasket (21) from heat exchanger.
(5) Remove screw (13) and pull fire ring (15) from assembly.
(6) Remove three setscrews (12) and pull block (16) from burner (14).
(7) Remove two setscrews (5 and 17) and pull electrodes (7 and 10) from block (16).
(8) Remove bushings (3 and 4) from block (16).
(9) Remove studs (6 and 9) and o-rings (8 and 11) from electrodes (7 and 10).
Change 3 3-120
