C4, TM 9-2350-230-12
PERSONNEL HEATER IGNITER, OVERHEAT SWITCH, AND
FLAME DETECTOR SWITCH.
(AIR VALVE REMOVED FOR CLARITY) ,3
FLAME DETECTOR
SWITCH ASSEMBLY
FLAME DETECTOR SWITCH ADJUSTMENT
PRELIMINARY STEP
REMOVE GUARD ASSEMBLY FROM HEATER (FIGURE 9-
1. CHECK BOW SPRING TO SEE IF TENSION OF
136).
QUARTZ ROD IS CAUSING IT TO BOW UP
TOWARD THE TOP OF THE SWITCH. IF SPRING
IS NOT BOWED BUT IS IN A STRAIGHT POSITION,
REMOVAL- IGNITER
IT MAY BE ASSUMED THAT QUARTZ ROD IS
1. REMOVE NUT AND TWO WIRES FROM TOP OF
BROKEN. REPLACE SWITCH.
IGNITER
2. IF SPRING IS BOWED, LOOSEN TWO SWITCH
2. USE 13/16 THIN WALL DEEP SOCKET TO SEN
MOUNTING SCREWS UNTIL MICRO SWITCH CAN
IGNITER, HOLD GROUND STRAP DOWN AND
PIVOT.
UNSCREV IGNITER BY HAND.
3. BACK OFF ADJUSTING SCREW UNTIL SWITCH
NOTE.
IF THIN WALL SOCKET IS NOT AVAILABLE,
"CLICKS."
DISCONNECT FUEL LINE AND REMOVE 450
4. TURN ADJUSTING SCREW IN UNTIL SWITCH
ELBOW AT THE FUEL CONTROL VALVE TO
"CLICKS"
AGAIN
AND
CONTINUE
FOR
PROVIDE CLEARANCE FOR A STANDARD
ADDITIONAL 1/4 TURN FROM CLICK POINT.
SOCKET.
SWITCH IS NOW CORRECTLY ADJUSTED.
3. REMOVE IGNITER FROM HEATER.
5. TIGHTEN TWO SWITCH MOUNTING SCREWS TO
HOLD SWITCH IN PROPER POSITION.
REMOVAL - OVERHEAT SWITCH
NOTE.
WHEN INSTALLED, THIS SWITCH MUST
1. DISCONNECT 3 WIRES FROM OVERHEAT
OPERATE WITHIN 40 SECONDS AFTER
SWITCH TERMINALS.
HEATER IGNITES. AFTER HEATER GOES
2. REMOVE TWO SCREWS AND OVERHEAT
OUT OR IS SHUT OFF, SWITCH MUST
SWITCH. REMOVAL - FLAME DETECTOR SWITCH
NOT RE-OPERATE WITHIN 1 MINUTE BUT
ASSEMBLY 1.
DISCONNECT FIVE WIRES FROM
MUST
RE-OPERATE
WITHIN
FLAME DETECTOR MICROSWITCH TERMINALS.
MINUTES.
REINSTALL
TERMINAL
SCREWS
AND
INSTALLATION
2. USE 1/2-INCH OPEN END WRENCH TO LOOSEN
COMPRESSION NUT.
REVERSE
REMOVAL
PROCEDURE,
REPLACING
3. LIFT FLAME DETECTOR ASSEMBLY STRAIGHT
UNSERVICEABLE
COMPONENTS
AS
REQUIRED.
OUT OF HOUSING TO AVOID BREAKING
CONNECT WIRING AS SHOWN ON WIRING DIAGRAM,
CERAMIC ROD.
FIGURE 9-136. WHEN REPLACING FLAME DETECTOR
SWITCH ASSEMBLY, RETURN OLD SWITCH ASSEMBLY
TO SUPPORT MAINTENANCE FOR REPAIR AND RETURN
TO STOCK.
Figure 9-137. Removal/installation - personnel heater igniter, overheat switch,
and flame detector switch assembly
9-141