TM 5-4520-253-13
REPAIR CONTROL BOX HARNESS PLUG
TOOLS: Tool kit, service, refrigeration unit
NSN 5180-00-596-1474
MATERIALS/PARTS: Sealant (Item 10, Appendix E)
Tape (Item 14, Appendix E)
Control box harness plug
Female terminal (8)
GENERAL SAFETY INSTRUCTIONS:
Power off.
Heater cool.
REPAIR:
Death or serious injury couId occur if precautions are not
taken when maintaining this equipment. Position HEATER-
OFF-FAN switch to OFF, remove power cable plug from
POWER RECEPTACLE, and ground capacitors C1 and C2
prior to gaining access to heater compartments. Terminals
of capacitors are accessible at end cover of combustion
blower. Always have another person standing by who is
trained in electric shock first aid.
Allow sufficient time for heater to cool to room tempera-
ture before gaining access to heater compartments.
Control box harness wires are potted into control box harness plug. Repair consists of replacing plug
Control box harness wires are long enough to allow cutting close to the plug and installing new
receptacle.
Proceed as follows:
1.
2.
3.
4.
5.
6.
Open control box by unlocking stud (1).
Disconnect plug (2) from receptacle (3) at center of control box.
Tag and remove violet, yellow, and grey wires (4, 5, and 6) and disconnect them from RESET
circuit breaker (7).
Remove screw (8), lock washers (9 and 10), and nut (11) attaching ground wire (12).
Remove four screws (13), lock washers (14), and nuts (15). One screw (13) also attaches
(16) of dust cover (17). Retain chain and dust cover.
chain
Pull room thermostat receptacle (18) out of mounting hole from inside control box, This will
provide enough slack in the control box harness for replacing plug (2).
3-46
