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Structural Maintenance
Unit and Engine Mounting Bolts
Check and tighten all unit and engine mounting
bolts during scheduled maintenance inspections.
Torque the unit mounting bolts to 60 ft-lb
(81 N•m). Torque the engine mounting bolts to
150 ft-lb (203 N•m).
Unit Inspection
Inspect the unit during pretrip inspection and
scheduled maintenance inspections for loose or
broken wires or hardware, compressor oil leaks,
or other physical damage which might affect unit
performance and require repair or replacement of
parts.
Condenser, Evaporator, and
Radiator Coils
Clean the coils during scheduled maintenance
inspections. Remove any debris (e.g., leaves or
plastic wrap) that reduces the air flow. Clean dirty
coils with compressed air or a pressure washer. Be
careful not to bend the fins when cleaning a coil.
If possible, blow the air or water through the coil
in the direction opposite the normal airflow.
Repair bent fins and any other noticeable damage.
Micro-Channel Coil Cleaning
Recommendations
Cleaning Intervals
•
The coils should be cleaned a Minimum of
once a year.
•
It is recommended that any time the unit is in
for service or maintenance that the coils be
inspected and cleaned if needed.
•
The coil should be cleaned if there are visible
accumulations that obstruct the view of the
fins or tubes of the coil.
•
The coils should be cleaned if there is debris
imbedded in the tubes and fins
The area and conditions in which the unit operates
will dictate the cleaning intervals and method(s)
needed.
Cleaning Methods (listed in order of
recommended method)
•
Take a cloth or towel and wipe the air side of
the coil going with the fins, across the tubes.
(Results shown in Figure 244.) The coil will
clean in a manner similar to the way lint
cleans from the lint trap of a household
clothes dryer.
1.
Check Bolts for Tightness
Figure 242: Unit and Engine Mounting Bolts
ARA2099
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