ELECTRICAL WIRING REPAIR GENERAL.

TM5-4120-383-14

4-19.

CONDENSATE

DRAIN.-Continued

(2) Check that aluminum tube from bulkhead to rear of unit is

not clogged.

Replace.

Replace all damaged parts found during inspection.

Installation.

(1) Slide clamps onto tubes.

(2) Slip tubing and clamps into place.

(3) Install the return air louver (para 4-13).

(4) Connect power at power source.

4-20.

ELECTRICAL WIRING REPAIR GENERAL.

Preferred repair methods consist of replacing wires, terminals

connectors etc., rather than splicing wires, bendinq ends to form

terminals, and other make-shift procedures, although the latter may

Determine the proper

be appropriate for emergency field repairs.

size and length of wire, or the terminal, or connector to be used

for replacement by referring to Table 4-3, "Wire List", and to the

wiring diagram figure 4-4.

a. Soldering Connections. Wire connections must be made

mechanically sound before they are soldered; solder alone does not

provide sufficient strength to prevent breakage. Joining surfaces

If a

of connections to be soldered must be clean and bright.

separate flux is used, it should conform to Specification MIL-F-

14256, rosin base flux, item 6, Appendix E and should be brushed

If a flux-core solder is used, it

onto the joint before soldering.

If an uncored

should always be rosin-core electrical solder.

solder is used, it should be a lead-tin solder, item 7, Appendix E

conforming to Specification QQ-S-571. Wires should always be

heated to the point at which the solder will melt completely and

Excessive build-up of solder

flow into all parts of the joint.

"gobs" on the joint should be avoided or removed.

b. Insulating Joint.

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

Slide the tubing over the wire before making the joint.

insulated.

After the joint is made, slide the tubing so that it covers the

joint, and shrink in place with moderate heat.

4-56