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 174 of 524
TB 9-2320-279-13-1
0015-6
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.
POSSIBLE PROBLEMS
AC condenser dryer desiccant contaminant in
AC refrigerant system.
AC refrigerant oil contaminant in AC
refrigerant system.
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.
AC system charge low.
AC system leaking.
3.
Does AC condenser dryer
sight glass indicate system is
free from desiccant
breakdown and oil?
Perform leak test
(WP 0049).
Recover
R-134a refrigerant
(WP 0050).
Repair
any leaks found.
Flush system
(WP 0050). Replace
AC condenser dryer
(WP 0025).
Evacuate and charge
system with new
R-134a refrigerant
(WP 0050).
Go to
Step 4 of this fault.
NO
YES
Read WARNING on
page 0015-7.
WARNING
TEST OPTIONS
Visual inspection.
AC test set manifold gages.
REASON FOR QUESTION
If AC condenser dryer sight
glass indicates desiccant
breakdown or oil in
system, system must be
flushed.
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