CFESA Refrigeration Chapter 3
Why is the issue of refrigerant so difficult today? - answer Because there are so many
different refrigerants used today.
What is the problem caused by CFC refrigerants? - answer They are depleting the O
Zone layer in the atmosphere.
Why must refrigerants be recovered? - answer It is the law, and to protect the
environment.
What are HCFC refrigerants? - answer They are interim refrigerants except for R-22,
and they have a low ozone depletion potential.
What are HFC refrigerants? - answer The newer refrigerants with a zero o-zone
depletion potential.
Which type of refrigerant is preferable? – answer HFC refrigerants because they have
no potential to deplete the o-zone layer.
Why not just use HFC refrigerants all of the time? - answer It can be a major job to
switch to the new HFC refrigerants due to the hard task of removing all of the old
mineral oil and replacing it with the new Polyolester oil.
What qualities must refrigerants have? - answerP/T relationship, low boiling point, non-
toxic, non-flammable, non-explosive
What type of oil is used with R-12? - answerMineral oil
What is R-22 used for? - answerIt has been primarily used in air conditioning. It is now
being also used for coolers.
What type of oil is used with R-22? - answerMineral Oil
What type of refrigerant is R-22? - answerHCFC
What is the problem with using R-22 on low temperature applications? - answerIt has a
very high condensing temperature due to high heat of compression that results in
premature compressor failure on freezers. It requires specially designed compressors to
stand up to the heat stress.
What was R-502 used for? - answerSome cooler, but mainly for freezers.
Why is the issue of refrigerant so difficult today? - answer Because there are so many
different refrigerants used today.
What is the problem caused by CFC refrigerants? - answer They are depleting the O
Zone layer in the atmosphere.
Why must refrigerants be recovered? - answer It is the law, and to protect the
environment.
What are HCFC refrigerants? - answer They are interim refrigerants except for R-22,
and they have a low ozone depletion potential.
What are HFC refrigerants? - answer The newer refrigerants with a zero o-zone
depletion potential.
Which type of refrigerant is preferable? – answer HFC refrigerants because they have
no potential to deplete the o-zone layer.
Why not just use HFC refrigerants all of the time? - answer It can be a major job to
switch to the new HFC refrigerants due to the hard task of removing all of the old
mineral oil and replacing it with the new Polyolester oil.
What qualities must refrigerants have? - answerP/T relationship, low boiling point, non-
toxic, non-flammable, non-explosive
What type of oil is used with R-12? - answerMineral oil
What is R-22 used for? - answerIt has been primarily used in air conditioning. It is now
being also used for coolers.
What type of oil is used with R-22? - answerMineral Oil
What type of refrigerant is R-22? - answerHCFC
What is the problem with using R-22 on low temperature applications? - answerIt has a
very high condensing temperature due to high heat of compression that results in
premature compressor failure on freezers. It requires specially designed compressors to
stand up to the heat stress.
What was R-502 used for? - answerSome cooler, but mainly for freezers.
