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FORM 160.67-O2
ISSUE DATE: 10/9/2020
SECTION 7 - PREVENTIVE MAINTENANCE
It is the responsibility of the owner to provide the nec-
essary daily, monthly and yearly maintenance require-
ments of the system.
IMPORTANT – If a unit failure occurs
due to improper maintenance during the
warranty 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 pro-
vide a planned maintenance and inspection of its func-
tioning parts to keep it operating at its peak efficiency.
Therefore, the following maintenance should be per-
formed when prescribed.
COMPRESSOR
1. Oil Filter – Change when oil pump VSD fre-
quency increases to 55 hz to maintain target oil
pressure.
When the oil filter is changed, it should be inspect-
ed thoroughly for any aluminum particles which
would indicate possible bearing wear. If alumi-
num particles are found this should be brought to
the attention of the nearest YORK office for their
further investigation and recommendations.
2. Oil Changing – The oil in the compressor must be
changed annually or earlier if it becomes dark or
cloudy. However, quarterly oil analysis can elimi-
nate the need for an annual change provided the
analysis indicates there is no problem with the oil.
LEAK TESTING
The unit should be leak tested quarterly. Any leaks
found must be repaired immediately.
EVAPORATOR AND REFRIGERANT
CONDENSER
The major portion of maintenance on the condenser
and evaporator will deal with the maintaining the water
side of the condenser and evaporator in a clean condi-
tion.
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.
JOHNSON CONTROLS
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
recommendation should be followed in determining
the condition of the water side of the condenser and
evaporator tubes.
1. The refrigerant 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°F (2°C) greater than the difference
recorded on a new unit, it is a good indication that
the condenser tubes require cleaning. Refer to the
Maintenance section of this manual for condenser
tube cleaning instructions.
2. The evaporator tubes under normal circumstances
will not require cleaning. If however the temper-
ature difference between the refrigerant and the
chilled water increases slowly over the operating
season, it is an indication that the evaporator tubes
may be fouling or that there may be a water bypass
in the water box requiring gasket replacement or
refrigerant may have leaked from the chiller.
OIL RETURN SYSTEM
1. Change the dehydrator in the oil return system
semiannually or earlier if the oil return system
fails to operate.
2. When the dehydrator is changed, the nozzle of the
eductor should be checked for any foreign par-
ticles that may be obstructing the jet.
ELECTRICAL CONTROLS
1. All electrical controls should be inspected for ob-
vious malfunctions.
2. It is important that the factory settings of controls
(operation and safety) not be changed. If the set-
tings are changed without YORK's approval, the
warranty will be jeopardized.
7
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