Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2020.10
137/168
11.7
General rules for use of lubricating oil in refrigeration compressors
•
Charge only fresh, clean refrigeration machine oil. Oil tapped from the evaporator system
in an ammonia plant must not be reused in the compressor.
•
Use the grade of oil originally prescribed for the compressor.
•
To the extent possible, avoid mixing different types of oil. Mixed oil is generally inferior to
the two original oils. Mixing various types of oil may give rise to formation of sludge, which
will lodge in valves and filters.
•
If it is necessary to switch to another brand of oil, please contact the supplier of the new
oil for instructions. Note that some of the old oil may be left in the piping system.
•
The refrigeration oil must be moisture free as moisture may cause operating malfunctions
and corrosion attacks.
The oil should therefore be bought in containers containing enough oil for one or, at the most, two
top-ups. The oil containers must be kept carefully sealed. If all the oil in a container is not used at
once, the container should be tightly sealed and stored in a warm place to prevent moisture
absorption.
Note:
It is inadvisable to reuse oil which has been drawn from a compressor or plant. Such oil has
absorbed moisture from the air and may cause operating problems. Always switch off the power
to the heating rod before drawing off oil.
Caution!
Never add oil until the cause of the oil level drop has been found and corrected.
Warning!
Corrosive oil is a hazardous substance. It can cause irritation and injuries.
11.8
Assessing the oil
Oil in refrigeration plants is a vital part of the compressor. In addition to lubricating and cooling
the movable parts of the compressor, it also prevents abrasive particles from entering the
bearings.
An oil analysis provides important information on how the compressor runs. Johnson Controls
Denmark therefore recommends that the
oil analyses
are carried out at regular intervals as
described.
In order to obtain a representative oil sample, the oil must be drawn off while the compressor is in
operation. Before taking the sample, clean the drain valve and tap off a little oil to prevent any im-
purities which may have accumulated in the valve or piping system from mixing with the sample.
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