Operating manual - ChillPAC and LP ChillPAC Mk 3
010823 en 2021.06
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Maintenance instructions
6.2 Selecting lubricating oil for ChillPAC units
Only use PAO oils (Polyalphaolefin-based oils) for ChillPAC units.
PAO oil is a synthetic oil with low vapour pressure.
Usually, the ChillPAC 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.
6.3 R717 charge
It is very important that the chiller has the correct charge. The P&I diagram states the charge for each
specific chiller.
At normal operation the suction superheat should be between 0.5-3°K.
In the evaporator, droplets should come out of the top of the plates. The plates must not be completely
covered by liquid.
Note: The liquid level must never be visible in the inspection glass.
The quality of the refrigerant must be appropriate for refrigeration applications; for details, see: TI2015-
01 Ammonia quality.
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