TM 9-4940-556-14&P
6.12.3 Turn fuel valve ON (item 10).
6.13 BURNER REMOVAL/REPAIR - (REF. TO DRAWING JP7222) - TURN MAIN POWER OFF.
6.13.2 Disconnect fuel line from burner at anti-syphon fitting assembly.
6.13. 3 Disconnect high voltage from electrodes (item 9) and disconnect
t w o (2) wires connected to FLAME switch.
6.13. 4 Remove burner protector guard and burner assembly by removing
wing nuts holding both on to the bottom of the chassis. Be certain not
to damage the grounding wire connected to the burner.
6.13.5 Burner jet assembly.
6.13.5.1 Using a box wrench on burner jet and pipe wrench on burner
(Refer to drawing JP7222) dis-assemble jet
nipple, remove burner jet.
whirler and strainer.
6.13.5.2 Soak jet whirler and strainer in dry cleaning solvent,
while burner jet/strainer, and (fuel.) whirler are soaking, scrape carbon
from air whirler.
6.13.5.3 Re-assemble jet/whirler/strainer and install into burner nipple.
6.14 ELECTRICAL SYSTEM - REFER TO DRAWINGS JP7200, JP7201, JP7201-A, JP7203-B.
WARNING - MOST OF THE FOLLOWING ADJUSTMENTS MUST BE MADE
WHILE POWER IN ON AND UNIT IS OPERATING. UNIT WILL BE
OPERATED WITHOUT PROTECTIVE COVERS IN PLACE. DO NOT TOUCH
ELECTRICAL WIRING AND DO NOT BECOME ENTANGLED IN MOVING
APPARATUS.
6.14.1 Pressure switch adjustment. Remove cover over pressure switch
adjusting screw (ref. drawing SK-41-84). With STEAM position and the gun
held open, water supply connected to unit, turn main power switch ON.
6.14.1.1 Turn adjusting screw counter clockwise till it stops.
6.14.1.2 Turn adjusting screw clockwise three (3) turns.
6.14.1.3 Turn burner switch ON - turn adjusting screw on PRESSURE switch
(item 1) counter clockwise till burner ignites, the turn counter clockwise
an additional 1/16 turn.
6.14.2 Air differential switch adjustment. Remove cover from and locate
adjustment screw on top of switch (ref. drawing SK-40-84).
6.14.2.1 Rotate screw counter clockwise till it stops.
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