Properties of refrigerant oil |
The most important properties are a high degree of solubility with refrigerant, good lubricity, absence of acid and minimal water content. It is therefore only permissible to use certain specified oils. For a list of approved refrigerant oils and capacities, refer to → Chapter. |
PAG oils, which are appropriate for refrigerant R134a, are highly hygroscopic and do not mix with other oils. Opened containers should therefore be closed again immediately to prevent ingress of moisture. Moisture and acids promote the ageing of refrigerant oil, causing it to become dark, viscous and corrosive towards metals. |
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