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 182 of 524
TB 9-2320-279-13-1
0015-14
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.
AC condenser core OK.
AC expansion valve OK.
AC system not overcharged.
AC condenser dryer OK.
AC evaporator core OK.
No restricted AC hoses.
AC compressor OK.
POSSIBLE PROBLEMS
Temperature control switch faulty.
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
system.
8.
Does AC condenser fan motor
on/off cycle vary as the
temperature control switch is
adjusted from coldest
position to off position?
Replace temperature
control switch
(WP 0044).
Verify
repair, go to Step 22
of this fault.
NO
YES
Read WARNING on
page 0015-15.
WARNING
TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC condenser fan motor
on/off cycle does not vary
as the temperature control
switch is adjusted,
temperature control switch
is faulty.
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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.
AC condenser core OK.
AC expansion valve OK.
AC system not overcharged.
AC condenser dryer OK.
AC evaporator core OK.
No restricted AC hoses.
AC compressor OK.
Temperature control switch OK.
POSSIBLE PROBLEMS
Moisture in AC refrigerant system.
Air or other contaminant in AC refrigerant
system.
9.
Does AC system provide
adequate cooling?
Perform leak test
(WP 0049).
Recover
R-134a refrigerant
(WP 0050).
Replace
AC dryer (WP 0025).
Evacuate and charge
system with new
R-134a refrigerant
(WP 0050).
Verify
repair, go to Step 22 of
this fault.
NO
YES
Read WARNING on
page 0015-15.
WARNING
Go to Step 22 of this fault.
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TEST OPTIONS
Visual inspection.
REASON FOR QUESTION
If AC system does not cool
adequately, air or other
contaminant may have
entered system.
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