Operating manual - ComPAC
011769 en 2020.03
49/56
6. Maintenance instructions
6.1
Maintenance of the chiller unit
Read chapter
carefully before performing any maintenance on the chiller unit.
To ensure that the chiller unit operates without problems throughout a long service life, the sys-
tem of maintenance presented in the following instructions must be followed.
Daily maintenance is normally performed by the operating personnel. Other maintenance and
service tasks, which require the refrigeration system to be opened, must be performed by compe-
tent personnel.
Maintenance can be divided into:
1.
Daily maintenance
(minimum twice a week)
Daily maintenance consists of visual inspections:
•
Inspect the chiller unit and check that both noise and vibrations are normal.
•
To observe trends, it is recommended to enter the observed operating data in an
operations log, see
. Check that all operating values
are within the permissible ranges. Compare them with previous values to detect
trends.
•
Check the oil level.
•
Check the refrigerant charge.
•
Observe for leaks of refrigerant (smell of ammonia), oil, glycol or water.
•
Check mechanical seal oil draining bottle.
•
Check the control system for alarms/shutdowns.
2.
Half-yearly/yearly/major maintenance
•
In general, only the compressor needs to be maintained. However, it is recom-
mended to check that the chiller is running properly; check for fouling of heat ex-
changers and dirt in the filters, for instance.
Maintenance intervals are described in detail in the compressor manual.
6.2
Selecting lubricating oil for ComPAC units
Only use PAO oils (Polyalphaolefin-based oils) for ComPAC units.
PAO oil is a synthetic oil with low vapour pressure.
Usually, the ComPAC units are charged with oil from factory. Do not switch to a different oil type
or brand without first consulting Johnson Controls Denmark.
Oil changes are described in detail in the compressor manual.
PAO oil has many advantages:
–
High chemical stability: it is suitable for long-term operation.
–
Low vapour pressure: lower oil carry-over from the compressor.
–
High viscosity index: better oil recovery from evaporator.
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