TM 5-4520-253-13
R E M O V E / l N S T A L L P C B O A R D A S S E M B L Y ( C O N T)
6. Locate lower overheat thermostat bracket (28). Remove two screws (29) and lock washers (30),
and lift out bracket and lower overheat thermostat (31).
7. Disconnect red/white and grey wires (32 and 33) from thermostat (31).
8. Pry out grommet (34) and pull wires (32 and 33) through hole in bracket (28).
9. Locate flame switch and bracket assembly (35). Remove two screws (36) and lock washers
(37). Pull flame switch and bracket assembly (35) out of opening in heater bulkhead.
10. Disconnect yellow and grey wires (38 and 39) from upper overheat thermostat (40).
11. Disconnect red and violet wires (41 and 42) from flame switch (43). Disconnect red and brown
wires (44 and 45) from flame switch (46).
12. Pry out grommet (47) and pull wires through opening in flame switch and bracket assembly.
13. Remove screw (48) and lock washer (49) and release wiring from clamp (50).
4-15
