ENGINE COOLANT HEATER REPAIR (Cont).
FLAME SWITCH ADJUSTMENT
l If new flame switch (7) has been installed. no adjustment is required.
l if adjustment nut (10) has been disturbed, perform steps 1-4.
l Ensure that heater is off and at ambient temperature prior to flame
switch (7) adjustment,
Turn spring loaded screws securing cover 1/4 turn and remove cover.
Turn nut (10) on adjustment screw on switch bracket counterclockwise until blower fan comes
Very slowly, turn nut (10) clockwise until blower fan turns off, Note position of nut.
Turn nut (10) clockwise an additional 180 degrees from noted position, Seal nut with insulating
l Install engine coolant heater. (See TM 9-2320-289-20)