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Structural/Accessory Maintenance
Mounting Bolts
Check and tighten all unit, compressor, and fan
motor mounting bolts during pre-trip inspections
and every 1,000 operating hours. Unit mounting
bolts should be tightened to a torque value of
204 N•m (150 ft-lb). Compressor and fan motor
mounting bolts should be tightened to a torque
value of 20 to 21 N•m (15 to 20 ft-lb).
Unit Inspection
Inspect the unit during unit pre-trip inspection and
every 1,000 operating hours for loose or broken
wires or hardware, compressor oil leaks, or other
physical damage which can affect unit
performance and require repair or replacement of
parts.
Condenser Coil
Clean the condenser coil by blowing low pressure
compressed air or a medium pressure warm water
spray from the inside of the coil outward (opposite
direction of normal airflow). Inspect coil and fins
for damage and repair if necessary.
If a build up of salt or debris is present on the
condenser coil, the coil should be cleaned using a
mild alkaline cleaner with a pH of 9.5 to 10.5. For
example, a 2-3% solution of SIMPLE GREEN ®
would make a suitable cleaning solution. Apply
the solution using a pressure spray/wash type
apparatus. Spray the condenser coil thoroughly
from both the inside and outside of the coil.
Always thoroughly rinse the coil with a fresh
water spray.
Also inspect the directional airflow condenser
grille for damage. This grille directs the condenser
airflow out and away from the unit to increase the
efficiency of the condenser coil by preventing the
recirculation (short cycling) of warm air through
the coil. Abnormally high head pressures may
result if this special condenser grille is damaged
or missing.
Evaporator Coil
Clean the evaporator coil by blowing low pressure
compressed air from the bottom side of the coil
upward (opposite direction of normal airflow).
Inspect coil and fins for damage and repair if
necessary.
Defrost Drains
Clean the defrost drains every 1,000 operating
hours to be sure the lines remain open.
1. Tighten Unit Mounting Bolts
2.
Tighten Compressor, Condenser Fan and
Evaporator Fan Mounting Bolts
Figure 54: Mounting Bolts
1
2
AXA0248
CAUTION: Air pressure or water spray
must not be high enough to damage coil
fins.
CAUTION: Air pressure must not be high
enough to damage coil fins.
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