TM 9-4120-408-14
Table 4-3. Unit Preventive Maintenance Checks and Services for Evaporator Assembly.
Item
Item To Be
Not Fully
No
Interval
Checked or Serviced
Procedure
Mission Capable If:
1
ANNUALLY
Evaporator Coil
Inspect for cracks, holes,
Coil has cracks,
or damage to coil. Inspect
holes, or damage.
fins for damage and Fins are damaged or
presence of debris and
debris and foreign
foreign objects which
objects are present
restrict air flow.
which restrict air
flow.
SECTION V. UNIT TROUBLESHOOTING PROCEDURES
4-9. UNIT TROUBLESHOOTING.
The malfunction index lists malfunctions that may be observed by unit level maintenance. The malfunctions are then
cross-referenced to the troubleshooting table 4-4. Table 4-4 contains information useful in diagnosing and correcting
unsatisfactory air conditioner operation which may be encountered during operation or maintenance. Use the
malfunction index to locate specific troubleshooting procedures contained in table 4-4. After locating the listed
malfunction, perform the test/inspections and corrective actions in the order listed in table 4-4. The malfunction index
and Table 4-4 cannot list all malfunctions that may occur, all test and inspections required to find the fault, or all
corrective actions required to correct the fault. If the equipment malfunction is not listed or actions listed, do not correct
the fault, notify your supervisor.
UNIT MALFUNCTION INDEX
Malfunction
Malfunction
Air Conditioner Fails to Operate in Any Mode ........................................................................
1
Air Conditioner Suddenly Stops ............................................................................................
2
Insufficient Cooling Capacity .................................................................................................
3
High Pressure Warning Light on Control Module is Lit ..........................................................
4
Low Pressure Warning Light on Control Module is Lit ...........................................................
5
Air Filter Warning Light on Control Module is Lit ...................................................................
6
Condensate Drain Warning Light on Control Module is Lit ....................................................
7
Evaporator Fan Assembly Does Not Operate .......................................................................
8
Condenser Vane Axial Fans Do Not Operate ........................................................................
9
Start ......................................................................................................................................
10
Compressor Starts Normally, but High Pressure Cut Out Switch Soon Trips .........................
11
4-7