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Note
Different types of refrigerants must not be mixed with each other.
Only refrigerants specified for the respective air conditioning sys‐
tem may be used.
1.5.3 Environmental aspects of refrigerant
R134a
♦ R134a is a fluorocarbon and contains no chlorine.
♦ R134a has a shorter atmospheric persistence than refrigerant
R12.
♦ R134a does not damage the ozone layer, the potential to re‐
duce the amount of ozone is zero.
♦ The Global Warming Potential (GWP) of R134a lies by ap‐
prox. 1430 (the GWP for carbon dioxide lies by 1).
♦ The contribution of R134a to the greenhouse effect is less by
a factor of 10 than that of refrigerant R12.
1.6 Characteristics of refrigerant R134a
1.6.1 Trade names and designations
Refrigerant R134a is currently available under the following trade
designations:
♦ H-FKW 134a
♦ SUVA 134a
♦ KLEA 134a
Note
♦
Other trade designations may be used in other countries.
♦
Among the large selection of various refrigerants, only this one
may be used for vehicles. The designations Frigen or Freon
are trade names. They apply also to refrigerants which must
not be used in vehicles.
1.6.2 Colour
Like water, the refrigerant is colourless both in the vapour state
and the liquid state. Gases are invisible. Only the boundary layer
between gas and liquid is visible. (Fluid level in indicator tube of
charging cylinder for bubbles in sight glass.) Liquid refrigerant
R134a may appear coloured (milky) in a sight glass. This cloudi‐
ness is caused by partially dissolved refrigerant oil and does not
indicate a fault.
1.6.3 Vapour pressure
In an enclosed container that is not completely full, refrigerant
evaporates as vapour at the surface in a quantity sufficient to form
an equilibrium between vapour and liquid. This equilibrium de‐
velops under pressure and is often called vapour pressure. The
vapour pressure is temperature-dependant ⇒ page 3 .
Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
1. General notes on air conditioning systems 5
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