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TM 5-4120-287-15
5-13. Evaporator Blower Inoperative (All other components functioning)
Probable Cause
Possible Remedy
Defective line contactor relay (K106).
Check contactor; replace if defective (para 6-9c (4) and 6-10).
Connectors P107 and J107 and/or P109 and J109
Check for security of attachment and integrity of
and/or P110 not properly secured; connector, or
connector. Check harness. Replace or repair a damaged
wiring harness damaged.
connector or harness assembly.
Defective evaporator blower motor.
Check evaporator blower motor; replace if necessary, (para
6-12a, 6-13, and 6-14a).
5-14. Trip Relay K101 Recurrently Trips
Probable Cause
Possible Remedy
Defective high-low pressure switch (S103).
Adjust or replace as necessary (para 6-6c).
Defective compressor motor thermal overload.
Replace motor compressor assembly (para 5-20).
Defective low ambient temperature switch (S102).
Replace low ambient temperature switch (para 6-6b).
Intermittent short between lines 19 and 20.
Check terminal board TB1, connectors P106, J106, P108
terminals E and D. Replace or repair defective components as
necessary (fig. 1-9).
Defective trip relay (K101).
Internal intermittent short across relay K101 terminals 6 and 7.
Replace if damaged (para 6-9c (1).
Section III. REFRIGERANT SYSTEM MAINTENANCE
5-15. Precautions When Handling Refrigerant
Although refrigreant-12 is one of the safest refrigerants to handle, it is important that personnel observe the following
precautions in handling the refrigerant.
a. Do not discharge refrigerant-12 into areas having exposed flames. A heavy concentration of refrigerant in
contact with a live flame produces a gas which is toxic and attacks bright metal surfaces.
b. Do not expose the eyes to the refrigerant. If refrigerant-12 comes in contact with the eyes, observe the following
instructions.
(1) Do not rub the eye(s).
(2) Arrange at once to take the affected person to an eye specialist.
(3) Put drops of sterile mineral oil into the eyes to remove the excess refrigerant.
(4) Wash the eyes with either a weak solution of boric acid or a sterile salt solution (not to exceed 2 percent
sodium chloride).
c. Do not expose the skin to the liquid refrigerant. If the liquid comes in contact with the skin, treat the injury the
same as though the skin has been frostbitten or frozen. If a person is overcome in an area which lacks oxygen because of
the presence of a high concentration of refrigerant-12, treat the person by applying artificial respiration produced manually
or by a pulmotor.
5-16. Refrigerant Service Cylinder Handling Procedures
The following precautions must be observed when handling refrigerant bottles.
a. Do not leave the refrigerant bottle uncapped. All refrigerant bottles are shipped with a metal screw cap to protect
the valve and safety plug from damage. Replace the cap after each use of the refrigerant bottles.
b. Do not carry or otherwise transport a refrigerant bottle in the passenger compartment of a vehicle or carrier. Do
not expose the refrigerant bottle to radiant heat from the sun because the resulting increase in pressure can cause the
safety plug to release or the bottle to burst.
c, Never subject the refrigerant bottle to high temperature when adding refrigerant to the air conditioning system. A
bucket of hot water (not over 125 F), or hot wet rags around the bottle provides all the heat required to raise the refrigerant
in the bottle to a pressure higher than the pressure in the system when adding refrigerant.
5-4
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