TM 5-4520-241-14
(7) Remove flexible seal (16). Unscrew adapter (17) and remove the circuit breaker (18). Disconnect the wires.
b. Cleaning and Inspection.
(1) Clean all parts by wiping with a clean, dry cloth.
(2) Inspect the receptacle for damaged insulation and for bent or damaged pins. No repair of the receptacle is
possible, and it must be replaced if defective.
(3) Check the circuit breaker for continuity. If it is open, and continuity cannot be restored by pressing the button,
replace the circuit breaker.
(4) Check that the stud assemblies (19) operate properly. If they are loose or damaged, drive them out of the
control box weldment. Install a new stud assembly and retain by pressing on a new washer (20).
(5) Inspect fastening receptacle (22) for looseness and excessive wear. If it is loose, tighten by peening the
heads of rivets (21). If the receptacle is worn so that the control box cover cannot be fastened securely, drill out the rivets
and install a new receptacle.
(6) Inspect all hardware parts for stripped threads and other damage. Replace defective parts.
(7) Inspect the control box weldment for dents and bent walls. Straighten dents if possible, or replace the control
box assembly. Touch up scratched and chipped paint before reassembly.
c. Reassembly and Installation. Reassembly and installation of the control box are essentially the reverse of
removal and disassembly. Note the following:
(1) When connecting wires to the circuit breaker, either black wire can be connected to either terminal.
(2) When connecting wires to the receptacle, connect the violet wire to pin A, the green wire to pin B, and the
white/black wire to pin C. Solder the wires to the receptacle pins using rosin core electrical solder.
4-21.
CONTROL BOX WIRING HARNESS.
WARNING
This space heater contains dangerous voltages which can cause severe electrical
shock. Be sure to disconnect the power plug before repairing the beater.
4-46
