Table of Contents
Advertisement
Fundamentals
Refrigerant
•
The refrigerant used in current Mazda vehicles is called R134a. It is a hydrofluorocarbon
(C
H
F
) that at normal atmospheric pressure boils at –26°C. This property, combined
2
2
4
with the fact that it does not harm the ozone layer, makes it an almost perfect substance
for A/C. However, R134a does still contribute to the greenhouse effect.
NOTE: Older Mazda vehicles use R12 refrigerant, which must not be used anymore. In
addition, R12 and R134a must not be mixed.
Pressure-Temperature Relationship of R134a
•
This chart shows the relationship between pressure and temperature for the refrigerant.
At normal atmospheric pressure of 1 bar, refrigerant will boil at –26°C. Above this curve
(area 1 in the diagram) the refrigerant is gaseous, below the curve (area 2 in the
diagram) it is liquid.
X
Pressure
1
Gaseous refrigerant (above the curve)
02-10
Basic Climate Control
Y
Temperature
2
Liquid refrigerant (below the curve)
Curriculum Training
L1005_023
Advertisement
Table of Contents
