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 TM 5-4120-352-14
c. Some services are required at a shorter inter-
b. The item numbers are listed consecutively
val and are so noted. Service intervals should be
and indicate the sequence of inspection and mini-
shortened under extreme or unusual conditions.
mum requirements. Refer to table 4-1 for quarterly
preventive maintenance services.
TROUBLESHOOTING
Section VI.
pose of safety devices to open the circuit under cer-
4-11.
General.
tain overload or fault conditions. If a safety device
This section contains troubleshooting in-
is open, additional checking is required to deter-
structions for the isolation of causes and common
mine if the open is due to a faulty safety device or if
troubles that may occur during operation, and also
the safety device is performing its intended func-
gives the possible remedies to correct the trouble.
tion, and the fault is located elsewhere in the sys-
tem. To check the control circuit, proceed as follows.
4-12.
Organizational Troubleshooting
(1) Disconnect air conditioner from source of
Chart.
power.
a. General. Troubleshooting procedures for or-
ganizational maintenance personnel are listed in
check the continuity through each control in the af-
fected circuit with the control in the closed position,
gins by identifying the malfunction. Next, suitable
while being checked. Use the system schematic and
tests or inspections are made in step-by-step order.
wiring diagrams for point-to-point circuit tracing.
Finally, a corrective action is given. Remedies be-
(3) Replace each defective part with a ser-
yond the scope of organizational maintenance must
viceable like item.
be reported to direct support maintenance person-
c. Safety Devices. When testing the control cir-
nel. Additional procedures are given in paragraph
cuit and associated components, take into account
(b) and (c) which follow.
the normal state of the safety device. Determine (1)
b. Control Circuit. The cause for the failure of
whether it is normal for the device to be open under
the system to operate can be narrowed to a specific
the existing conditions or (2) if the open condition
portion of the system if the control component asso-
indicates trouble elsewhere in the air conditioner.
ciated with the failure can be isolated. It is the pur-
Table 4-1. Organizational Preventive Maintenance Checks and Services
Q - Quarterly
W - Weekly
Total Man-Hours Required: 0.40
Total Man-Hours Required: 3.50
SEQUENCE
ITEM TO BE INSPECTED
WORK TIME
NO.
PROCEDURE
(M/H)
Q W
1
AIR FILTER AND MIST ELIMINATOR
Inspect and service of replace as necessary (para 4-17).
0.30
2
FRESH AIR SCREEN
Inspect and clean or replace as necessary (para 4-19).
0.10
3
EVAPORATOR COIL
Clean and inspect (para 4-24).
0.50
4
CONDENSER COIL
Clean and inspect (para 4-23).
0.50
5
HOUSING COVERS
0.50
Repair or replace damaged covers (para 4-21).
6
WIRING AND ELECTRICAL COMPONENTS
Check for damaged or frayed wiring. Check for defective electrical components. Repair or replace de-
fective wiring, Replace defective electrical components (para 4-33).
0.50
7
REFRIGERATION SYSTEM
0.50
Check compressor, valves and piping for damage. Report damage to direct support maintenance.
4-2
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