Operating manual - HeatPAC with reciprocating compressor
009332 en 2021.07
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6.2
Selecting lubricating oil for heat pump units
Only use PAO oils (Polyalphaolefin-based oils) for heat pump units.
PAO oil is a synthetic oil with low vapour pressure.
Usually, the heat pump is charged with oil from factory. Do not switch to a different oil type or brand with-
out 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 heat pump has the correct charge. The P&I diagram states the charge for
each specific heat pump.
At normal operation, the suction superheat should be between 1.5 and 4°K.
In the evaporator, droplets should come out of the top of the plates. The plates must
not
be 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 TI 2015-
01 Ammonia quality.
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