TM 9-4110-254-14
DIRECT SUPPORT MAINTENANCE INSTRUCTIONS
SECTION I DIRECT SUPPORT TROUBLESHOOTING INSTRUCTIONS
5-1. TROUBLESHOOTING.
The following procedures are listed in order of the most probable malfunctions. Each malfunction is followed by test
or inspection procedures in logical order to isolate and identify the fault and actions required to correct it. This
section cannot list all the possible malfunctions that may occur with the equipment. If a malfunction occurs that is
not listed or actions listed do not correct a malfunction, notify your supervisor
a. Pressure Gage (Discharge) Indicates Above Operating Range.
INSTALL SERVICE MANIFOLD (PARA 5-6) AND
OPERATE REFRIGERATION UNIT (PARA 2-5) DOES
SERVICE MANIFOLD GAGE READING MATCH
PRESSURE GAGE (DISCHARGE) READING?
YES
NO
CHECK REFRIGERANT SYSTEM PRESSURE
REPLACE PRESSURE GAGE (DISCHARGE)
(PARA 5-32)
YES
NO
ADJUST REFRIGERANT CHARGE AS NECESSARY
REPLACE DEHYDRATOR (PARA 5-14).
b. Compressor Operates For Short Period Then Stops.
OPERATE REFRIGERATION UNIT (PARA 2-5) AND
OBSERVE PRESSURE GAGE (SUCTION) DOES
PRESSURE DROP RAPIDLY?
YES
NO
REPLACE LIQUID LINE SOLENOID (PARA 5-24).
IS PRESSURE GAGE (SUCTION) AND PRESSURE
GAGE (DISCHARGE) INDICATING WITHIN
NORMAL OPERATING RANGE?
YES
NO
TEST COMPRESSOR (PARA 5-36). REPAIR OR
CHECK REFRIGERANT CHARGE (PARA 5-12) AND
REPLACE AS NECESSARY.
ADJUST AS NECESSARY
5-1
