Preventive maintenance
It is the responsibility of the owner to provide the necessary daily, monthly and yearly maintenance
requirements of the system.
Important: If a unit failure occurs due to improper maintenance during the warranty period,
Johnson Controls 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 functioning parts to keep it operating at its peak efficiency. Therefore, the following
maintenance should be performed when prescribed.
Compressor
1. Oil filter: When oil pump VSD frequency increases to 55 Hz to maintain target oil pressure.
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 Johnson Controls 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 eliminate the need for an annual change
provided the analysis indicates there is no problem with the oil.
Compressor motor
1. Check motor mounting screws frequently to ensure tightness.
2. Meg motor windings annually to check for deterioration of windings.
Greased bearings
Motor Operation and Maintenance manuals are supplied with the chillers providing maintenance
schedules and instructions for the specific motors. The following are lubrication schedules for the
most common motors:
Motor relubrication instruction
Electric drive motors supplied by Johnson Controls have maintenance requirements for
relubrication (greasing) of the drive end (DE) and non-drive end (NDE) ball bearings.
In recent years, the type of grease to be used is identified on the motor data plate. See Table 5 for
a quick guide. However, always perform a verification with the motor data plate. Any differences
between the quick guide and the motor data plate must be communicated to the product technical
support (PTS) team before completing the greasing application.
45Model YK (Style H), R-134a and R-513A
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