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
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
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
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