TM 9-4120-402-14
4-26. ELECTRICAL WIRING REPAIR - GENERAL.
This task covers:
Repair
INITIAL SETUP
Tools
Materials/Parts
Refrigeration Unit Service Tool Kit
Wire
Insulation Sleeving
Soldering Gun Kit
(Heat-Shrink Tubing)
Solder
Crimping Tool Kit
Heat Gun
Equipment Conditions
:
CAUTION
Use disconnect switch (NOT POWER CABLE)
to disconnect power to unit. Damage to cable
connector pins will result 'if cable is used.
Disconnect power at power source.
Repair
Wire connections must be made mechanically sound before they are soldered; solder alone does not provide
sufficient strength to prevent breakage. Joining surfaces of connections to be soldered must be clean and bright.
Flux should be brushed onto the joint before soldering. Wires should always be heated to the point at which the
solder will melt completely and flow into all parts of the joint. Excessive build-up of solder "gobs" on the joint
should be avoided or removed.
(2) Insulating Joints.
The preferred method of insulating electrical joints is by the use of heat-shrink tubing. To apply, cut a piece of
heat-shrink tubing of suitable diameter to a length of 1 inch (2.5 cm) for covering joints at terminals or
connectors, or to a length about 1/2 inch (1.3 cm) longer than the joint to be insulated. Slide the tubing over the
wire before making the joint. After the joint is made, slide the tubing so that it covers the joint, and shrink in
place with moderate heat.
(3) Splicing Wires.
To repair broken or cut wires that are otherwise sound, the mating ends can be stripped and spliced. Solder and
apply insulation as described above.
4-83