Removal. - TM-5-4120-352-140054

TM 5-4120-352-14

(1) Wipe off all loose dirt with a dry cloth.

b. The control should be adjusted for the center

(2) Inspect push-pull control for smooth oper-

position between open and closed. The actuator

ation of core in casing. Inspect vent damper for bent

should then be in the centered position and the rod

or broken condition. Replace defective parts. In-

on top of the damper should be parallel with front of

spect for loose or damaged rubber seal on damper.

the housing.

Cement loose rubber or replace rubber if damaged.

c. Check operation. The control should move

Inspec actuator for bent condition. Straighten actu-

smoothly between the open and closed position.

ator or replace as required.

4-28. Removal.

4-30. Installation.

a. Vent Damper. Refer to figure 4-5 and re-

a. Vent Control Actuator. Refer to figure 4-7

move the housing covers. Refer to figure 4-8 and re-

move vent damper as follows:

and install actuator, screw, two spring washers and

nut.

(1) Loosen screw on mechanical post and dis-

b. Vent Damper. Refer to figure 4-8 and install

connect push-pull control.

vent damper in opening in housing. Secure cent

(2) Remove two screws and lockwashers and

damper cover to housing with two screws and lock-

lift vent damper from air conditioner.

washers.

b. Psuh-Pull Control. Refer to figure 4-2 and

c. Push-pull Control. Refer to figure 4-7 and 4-

remove evaporator louvers. Refer to figures 4-7 and

8 and install control as follows:

4-8 and remove push-pull control as follows:

(1) With one nut on each end of outer casing

(1) Remove screw, washer, nut, spacer, and

loop clamp.

of push-pull control, install ends of control through

opening in housing. Install outer nuts and insert

(2) Loosen screw on mechanical post to free

ends of wire core into mechanical post of damper

end of control wire core.

and actuator. Tighten outer nuts on casing.

(3) Remove outer nuts from both ends of con-

(2) Install clamp, spacer, screw, nut, and

trol outer casing and remove push-pull control.

washer.

c. Vent Control Actuator. Refer to figure 4-7

(3) Refer to paragraph 4-27 and adjust the

and remove screw, nut, two spring washers and

control.

actuator.

(4) Refer to figure 4-5 and install housing cov-

ers.

4 - 2 9 . Cleaning, Inspection and Repair.

(5) Refer to figure 4-2 and install evaporator

Clean, inspect and repair vent damper and con-

inlet and outlet louvers.

trol as follows:

Section XI. MAINTENANCE OF ELECTRICAL SYSTEM

4 - 3 2 . Testing and Inspecting the Elec-

4-31. General.

The electrical system consists of the evaporator

trical System.

Troubleshooting procedures for testing the elec-

and condenser fan motors, electric heaters and

trical system to isolate cause of trouble are covered

heater thermostatic switch, junction box, control

in paragraph 4-12. Additional detailed test infor-

module, transformer, rectifier, condenser fan motor,

mation is contained in specific paragraphs covering

high- low speed thermostatic switch and connecting

harnesses and wiring. Electrical assemblies and

the electrical components. Use a continuity tester

groups of associated components are covered in sep-

or multimeter set on low ohms to test for continuity.

Use an insulation tester or multimeter set on

arate sections.

higher ohm range to test for grounds between the

circuit in a component and the outside case of the

component. When testing an electrical component,

Disconnect air conditioner power

supply before performing mainte-

check also for visual damage and inspect all wiring

nance work on electrical system.

in the area for damage or loose connections.

4-20