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TK 56433-5-MM-EN
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).
Figure 106.
Unit and Engine Mounting Bolts
1.
Check Bolts for Tightness
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
N
No
otte
e:: 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. See
(
) for results. The coil will clean in a
manner similar to the way lint cleans from the lint
trap of a household clothes dryer.
•
Use a soft bristled brush (DO NOT USE A WIRE
BRUSH) and brush the coil going with the fins,
across the tubes. The coil will clean in a manner
similar to the way lint cleans from the lint trap of a
household clothes dryer.
•
A vacuum with a soft attachment can be used to
suck the debris off the face as well as in the fins and
tubes from the air side of the coil.
•
Compressed air can be used and will work best
when blown thru the coil from the non-air side
when possible. Blowing thru from the airside may
imbed debris in the coil that was only on the
surface. It is recommended to start with one of the
first three options before using compressed air if
the non-air side is not accessible. The angle at
which the air should be directed at the coil should
not be less than 75 degrees (
