TB-9-2320-279-13-1
TECHNICAL BULLETIN; AIR CONDITIONING SYSTEM
OPERATOR’S, UNIT AND DIRECT SUPPORT MAINTENANCE MANUAL, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LISTS
DECEMBER 2005
TB-9-2320-279-13-1 - Page 178 of 524
TB 9-2320-279-13-1
0015-10
AC DOES NOT COOL OR COOLS INADEQUATELY - Continued
DRAFT
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KNOWN INFO
Power to AC system OK.
AC heater/evaporator blower OK.
AC control circuits OK (except for
temperature control and low pressure
switches).
AC low pressure switch OK.
No AC condenser dryer desiccant
contaminant in AC refrigerant system.
No AC refrigerant oil contaminant in AC
refrigerant system.
AC system charge is not low.
No AC system leaks.
POSSIBLE PROBLEMS
Restricted AC hose.
AC compressor faulty.
Temperature control switch faulty.
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
system.
AC condenser core faulty.
AC expansion valve faulty.
AC system overcharged.
AC condenser dryer faulty.
AC evaporator core faulty.
5.
Does AC test set recovery/
recycling manifold gage
indicate normal system low-
side pressure?
Go to Step 10 of this
fault.
NO
YES
Read WARNING on
page 0015-11.
WARNING
TEST OPTIONS
Pressure test.
AC test set manifold gages.
REASON FOR QUESTION
To isolate system fault.
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