Description
Castrol AircolTM AMS 46 and 68 are high performance refrigeration compressor lubricants specially formulated from highly
refined hydro-processed base oils and performance additives for systems running on Ammonia (NH3) refrigerant. Theyare
specifically designed for systems where oil is allowed to separate from the refrigerant before the refrigerant passesthe
evaporator.
Application
The operating conditions experienced in ammonia refrigeration compressors requires very specific lubrication properties.
Lubricants commonly used in Freon refrigeration compressors normally do not perform well with ammonia refrigerant,
resulting in problems such as high oil carry-over from the compressor, high oil top-up rate, and rapid viscosity increaseand
carbon deposit formation in the compressor.
Aircol AMS is based on hydro-processed base oils, which have a narrow cut boiling point range, high degree of saturation,
and low volatility properties, resulting in low carbon residues. These base oil properties, reinforced by unique additive
technology, provide outstanding performance in ammonia refrigerating compressors, effectively reducing oil top-up rate, and
minimizing viscosity increases and carbon deposit formation in the compressor. Significant improvement incompressor
cleanliness and multi-fold increase in oil life can therefore be expected when switching from conventionalrefrigeration oils to
Aircol AMS.
Aircol AMS can be used in both reciprocating and screw type compressors running on ammonia refrigerant. Due to the
high viscosity index of Aircol AMS compared to the normal naphthenic based refrigeration oils, it is capable of providing
better wear protection to the compressor components, particularly under high discharge temperature.
To achieve the maximum benefits and increased oil life offered by Aircol AMS, it is recommended that flushing oil withhigh
solvency should be used to clean the compressor of any residual oil before filling. One cost effective way to achievethis is
by running the compressor on normal naphthenic based refrigeration oil for about 50 hours or so, then the flushingoil can
then be drained off before refilling with a fresh charge of Aircol AMS.
Advantages
Good thermal stability with very low carbon residue formation tendency
Immiscible and non-reactive towards ammonia refrigerant over the entire operating temperature range, ensureing
problem free operation
Good low temperature flow properties
Narros cut base oils with low volatility, capable of reducing oil carry-over from the compressors, lowering the oil
top-up rate, preventing rapid viscosity increase and prolonging oil life
High viscosity index providing good wear protection to the compressor components even at high discharge
temperature.