Manual for Refrigeration Servicing Technicians - UNEP - Division of ...
Manual for Refrigeration Servicing Technicians - UNEP - Division of ...
Manual for Refrigeration Servicing Technicians - UNEP - Division of ...
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2<br />
Refrigerants<br />
Characteristics<br />
An important characteristic <strong>of</strong> many <strong>of</strong> the synthetic lubricants,<br />
such as POE and PAG oils, is that they are more hygroscopic<br />
than mineral oils as shown in the diagram below. They saturate at<br />
approximately 1000 ppm from atmospheric moisture, compared to<br />
about 100 ppm <strong>for</strong> mineral oils. The POE lubricants are considerably<br />
less hygroscopic than PAG lubricants. This diagram shows lubricant<br />
compatibility <strong>for</strong> some refrigerants.<br />
MOISTURE CONTENT<br />
TIME (HOURS)<br />
Hygroscopy <strong>of</strong> POE and mineral lubricants<br />
PAG<br />
POE<br />
MINERAL<br />
10 000 PPM<br />
1000 PPM<br />
100 PPM<br />
Refrigerant Mineral<br />
Oil (MO)<br />
Alkyl<br />
benzene<br />
(AB)<br />
Appropriate Lubricant<br />
Polyol<br />
Ester<br />
(POE)<br />
Poly alpha<br />
oelfin<br />
(PAO)<br />
Chapter 4 <strong>of</strong> this manual presents in<strong>for</strong>mation about the problems moisture<br />
can create in a system, and how to deal with them.<br />
52<br />
Poly alkyl<br />
glycol<br />
(PAG)<br />
CFC-11 � � � � �<br />
CFC-12 � � � � �<br />
R-502 � � � � �<br />
HCFC-22 � � � � �<br />
HCFC-123 � � � � �<br />
HFC-134a � � � � �<br />
HFC-404A � � � � �<br />
HFC-407C � � � � �<br />
HFC-410A � � � � �<br />
HFC-507A � � � � �<br />
HC-600a � � � � �<br />
HC-290 � � � � �<br />
R-717 (NH 3 ) � � � � �<br />
R-744 (CO 2 ) � � � � �<br />
�: Good Suitability �: Application with limitations �: Not Suitable
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