
Compressor Application Manual
73
3 - Maintenance of domestic
refrigeration system
3.1 - Blends
Normally consisting of two or three
refrigerant fluids of the HCFC type
(hydrochlorofluorocarbons), or HCs
(hydrocarbons) have the following main
characteristics:
• Ozone Depletion Potential (ODP) less
than R 12.
• Its components do not completely
blend and this is why they are called
non-azeotrope refrigerants.
• Developed to be used in compressors
currently manufactured for R 12.
Some have restrictions regarding lube
oil and may not be used with mineral
oil. In such cases, the oil should be
replaced by synthetic oil
(alkylbenzene).
• By the fact that its components do not
blend completely, any leakage at the
gaseous stage may affect the
performance of the refrigeration system.
This occurs due to the different
properties among the refrigerants, so
that those with less density escape first,
altering its composition.
VII
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