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TM 5-4120-287-15
CHAPTER 5
GENERAL MAINTENANCE INSTRUCTIONS
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Section I. SPECIAL TOOLS AND EQUIPMENT
5-1.
Special Tools and Equipment
No special equipment is required by direct and general support and depot maintenance personnel for performing
maintenance on the air conditioner.
5-2.
Specially Designed Tools and Equipment
No specially designed tools or equipment are required by direct and general support and depot maintenance personnel for
performing maintenance on the air conditioner.
Section II. TROUBLESHOOTING
5-3.
General
This section provides information useful in diagnosing and correcting unsatisfactory operation or failure of the air
conditioner or any of its components. Each trouble symptom stated is followed by a list of probable causes. The possible
remedy recommended is described opposite the probable cause.
5-4.
Unit Inoperative (No operation in any control position)
Probable Cause
Possible Remedy
Fuse F1 blown, or no fuse in 28 VDC circuit
Check fuse for continuity; replace if necessary (para
3-37). Recurrent fuse failure indicates a short in 28
VDC circuit. Check wiring for continuity and shorts.
(para6-9b(1)).
Trip relay K101 tripped (energized).
Press system reset switch. Restart according to
paragraph 2-10. Check trip relay (para 6-9c(1)).
Main power cable not properly secured, or cable damaged.
Check power input cable and connector (J101 and P101)
for continuity and positive connection.
Interrupted power supply
Check line side of power cable; if not reading check
main power supply.
Remote control cable not properly secured, or cable damaged.
Check cable connectors J102 and J103 for continuity
and positive connection.
Remote control box inoperative
Check temperature control switch and air conditioning
switch repair or replace control box as necessary
(para 6-1 through 6-4).
Master circuit breaker (CB1) defective
Check circuit breaker; replace if necessary (para6-9a).
Defective silicon rectifier (CR1).
Check rectifier for opens, shorts and proper output;
replace if necessary (para 6-9b(4)).
Power supply connected out of phase.
Check phase; correct as necessary (para 2-4a(8)).
Defective power transformer (T1)
Check transformer for opens, shorts and proper output;
replace if necessary (para 6-9b(3)).
No primary input at power transformer.
Phase sequence relay (K108) defective, or wrong relay
installed. Check relay; replace as necessary (para6-
9b(2))
5-5.
Air Conditioner Stops
Probable Cause
Possible Remedy
Refer to probable cause column of paragraph 5-4.
Refer to possible remedy column of paragraph 5-4.
5-1
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