Conversion programs are available for old existing systems filled
with the ozone-depleting substance R12. Refer to Repair manual
for air conditioners with refrigerant R12 (this repair manual is only
available in hard copy).
For environmental protection reasons, refrigerants must not be
released into the atmosphere. For laws and regulations, refer to
⇒ “1.2 Laws and Regulations“, page 12 .
Refrigerant R134a Physical Data
Chemical formula CH2F–CF3 or CF3–CH2F
Chemical designation Tetrafluoroethane
Boiling point at 1 bar -26.5 °C
Solidification point -101.6 ℃
Critical temperature 100.6 ℃
Critical pressure 40.56 bar (absolute)
Critical Point
The critical point (critical temperature and critical pressure) is that
above which there is no longer a boundary between liquid and
gas.
A substance above its critical point is always in the gaseous state.
At temperatures below the critical point, all types of refrigerant in
pressure vessels exhibit both a liquid and a gas phase, for ex‐
ample, there is a layer of gas above the liquid.
As long as both liquid and gas are present in the vessel, the pres‐
sure is governed by ambient temperature. Refer to
⇒ “1.1.3 Refrigerant R134a Vapor Pressure Table“, page 4 .
Note
Different types of refrigerant are never to be mixed. Only the re‐
frigerant designated for the corresponding A/C system may be
used.
1.1.2 Refrigerant R134a Characteristics
The vapor pressure curves of R134a and other refrigerants are
sometimes very similar, therefore it is not possible to make a cer‐
tain distinction solely by pressure.
With R134a, the A/C compressor is lubricated with special syn‐
thetic refrigerant oils, for example, PAG oils (polyalkylene glycol
oils).
Trade Names and Designations
Refrigerant R134a is currently available under the following trade
names:
♦ H-FKW 134a
♦ SUVA 134a
♦ KLEA 134a
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
2 Rep. Gr.00 - General, Technical Data
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