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58 YORK INTERNATIONAL
SECTION 8
PREVENTIVE MAINTENANCE
It is the responsibility of the owner to provide the nec-
essary daily, monthy and yearly maintenance require-
ments of the system.
IMPORTANT – If a unit failure
occurs due to improper maintenance during the war-
ranty period; YORK will not be liable for costs incurred
to return the system to satisfactory operation.
In any operating system it is most important to provide
a planned maintenance and inspection of its function-
ing parts to keep it operating at its peak efficiency.
Therefore, the following maintenance should be per-
formed when prescribed.
COMPRESSOR
1. Oil Filter – The oil filter must be changed when the
oil pressure drops 30% or semi-annually if not re-
quired earlier.
When the oil filter is changed, it should be inspected
thoroughly for any aluminum particles which would
indicate possible bearing wear. If aluminum particles
are found this should be brought to the attention of
the nearest YORK office for their further investiga-
tion and recommendations.
2. Oil Changing – The oil in the compressor must be
changed annually or earlier if it becomes dark or
cloudy.
COMPRESSOR MOTOR
1. Check motor mounting screws frequently to insure
tightness.
2. Meg motor windings annually to check for deterio-
ration of windings.
PRESSURE TESTING
The unit should be pressure tested annually. Any leaks
found must be repaired immediately. Air and moisture
are the worst enemies of these systems and experi-
ence has shown that units which are maintained tight,
are systems that provide trouble free efficient opera-
tion.
COOLER AND CONDENSER
The major portion of maintenance on the condenser
and cooler will deal with the maintaining the water side
of the condenser and cooler in a clean condition.
The use of untreated water in cooling towers, closed
water systems, etc. frequently results in one or more
of the following:
1. Scale Formation.
2. Corrosion or Rusting.
3. Slime and Algae Formation.
It is therefore to the benefit of the user to provide for
proper water treatment to provide for a longer and more
economical life of the equipment. The following recom-
mendation should be followed in determining the con-
dition of the water side of the condenser and cooler
tubes.
1. The condenser tubes should be cleaned annually
or earlier if conditions warrant. If the temperature
difference between the water off the condenser and
the condenser liquid temperature is more than 4°
greater than the difference recorded on a new unit,
it is a good indication that the condenser tubes re-
quire cleaning. They should be cleaned as instructed
on pages 38 to 39 of this manual.
2. The cooler tubes under normal circumstances will
not require cleaning. If however the temperature dif-
ference between the refrigerant and the chilled wa-
ter increases slowly over the operating season, it
is an indication that the cooler tubes may be fouling
or that there may be a water by-pass in the water
box requiring gasket relacement or refrigerant may
have leaked from the chiller.
OIL RETURN SYSTEM
1. Change the dehydrator in the oil return system semi-
annually or earlier if the oil return system fails to
operate.
2. When the dehydrator is changed, the nozzle of the