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Air Conditioner
929
Characteristics
of the refrigerant
R 12
Trade designation:
Frlgen R 12, Freon R 12
Chemical designation:
CCl2F2 (Dichloffluor-
methane) or CF2Cl2
(Diuordichlormethane)
R 12 is colorless, odorless. non-toxic,
non-
4. Moisture in the refrigerant leads to decom-
position of the refrigerant oil and to icing of
the expansion valve. For this reason, dis-
mantled lines and assemblies and test instru-
ments must be sealed immediately
after use
In order to keep out air humidity and dirt par-
tides.
combustible
and heavier than air.
Boiling point: - 30" C at atmospheric
pressure.
At higher pressure, R 12 is also still fluid at
higher temperatures
(e.g. in the pressure
bottle).
Chemical
behavior
with respect to other
substances
1. R 12 does not attack most metals, particu-
larly iron, copper, brass and aluminum, but
lead may react with R 12 under certain cir-
cumstances.
For this reason, lead is not
used in refrigeration
engineering.
2. Many plastics are decomposed
by R12.
Seals and closures etc. made of plastic
must be used only if they have been
specially recommended
by the refrigerant
companies.
3. R 12 dissolves oil. The special refrigerating
oil required for lubricating
the compressor
circulates in the refrigerant circuit. Additives
or contaminations
in the oil enter Into chemi-
cal reactions with R 12: consequently,
only
oils suitable for the refrigerant R 12 must be
used.
87 - 4
Characteristics
of the refrigerant
R 12
Printed
in
Germany
- XXV. 1990
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