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In the period after start-up and at low-load operation, the oil recovery system will return more oil
to the compressor than during full load.
At part-load operation, the oil will settle easier because of less boiling in the evaporator.
Drop in oil temperature
Cause
Wet suction gas due to too high R717
charge
Wet suction gas due to fluctuating load
Wet suction gas due to quick changes in
compressor capacity
Too much compressor cooling
5.6.3
Testing of chillers
Chillers supplied by Johnson Controls Denmark have been function and performance tested, as
far as possible.
A performance test consists of simultaneous measurements of cooling capacity, power consump-
tion and condenser capacity.
It is not a simple task to measure performance. High quality measuring and logger equipment is
required to make reliable and accurate measurements. Contact a Johnson Controls representa-
tive if a performance test is needed.
Solution
Reduce charge.
Check secondary system.
Adjust settings for load/unload compressor capacity
in Unisab III.
Reduce water flow or temperature to compressor
cooling. See compressor manual for more
information.
48/56
Operating instructions
Operating manual - ComPAC
011769 en 2020.03
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