"The importance of lubricants"
A/C system lubricants are specifically
made for A/C systems.
The purpose of these special oils is to provide
lubrication for the compressor.
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ISO 32/68/100/170 & Universal
These oils are fully synthetic lubricating fluids,
based on synthetic and biodegradable polyester oils
(POE) with a particular anti-wear additive package specifically designed for refrigeration and air conditioning systems that work with alternative refrigerants that are not detrimental to the ozone layer.
Lubricants for R-744
PAG OIL 68 / POE OIL 85
CO2 has much higher operating pressures and temperatures than medium pressure halogen refrigeration fluids, thus involves extreme mechanical constraints on moving components and bearings.
Consequently, in tcase an unsuitable oil is used, the result of insufficient lubrication can be a premature wear of the system and a leak with a consequent loss of compression.
Basic addittivated POE molecules or PAG molecules will be more suitable for R-744 and may be suitable in subcritical and transcritical applications.