AUX E Series, Руководство по обслуживанию

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AUX air conditioner service manual
8
② Freon species refrigerant
They are the ramifications of methane and ethane with the changing character in consequence of the
quantities variety of the atoms of fluorine, hydrogen and chlorine. The best option for choosing a
chemical compound at the vaporizing temperature of -130
℃ to +80 ℃ is the one with quite more
fluorine atom in consideration of the easy application of the refrigeration technology, because the
compound with more fluorine atom has less toxicity and can maintain a higher chemic stability. In
addition, the compound with less hydrogen atoms has less possibility in explosion and inflammation,
and if with more chlorine atoms the evaporation temperature will be higher. The more information
about the character of Freon will be specified in details in the following paragraphs.
③ Azeotropic mixture refrigerant
They are the mixture of two or above than two types Refrigerants in certain percentage. Their
character is same as the one of the single compound that maintains the invariable evaporation
temperature under the fixed pressure. However, the component of their vapor phase and liquid phase
are same and retain in the same.
Azeotropic mixture has some distinguished character comparing with the single refrigerant, such as
low evaporation temperature, large capacity per unit refrigerant and low compressor discharge
temperature etc. So the application of the azeotropic mixture can enhance the performance of the
refrigerant.
In compliance with the national regulation, “R” is the symbol standing for the refrigerant. The
refrigerant can also be classified in three types according to the level of evaporation temperature and
the condensing pressure value under normal temperature as the description in table 1-3:
Table 1-3 The classification of refrigerant
Types
Refrigeran
t
Rated
evaporation
temperature( ℃ )
The condensing
pressure under
normal temp.
（ Mpa ）
Application Range
High
temp. and
low
pressure
R11
R21
R113
R114
>0 <1.96-7.94
Applicable in the centrifugal
compressor of the
Air-conditioning system.
Middle
temp. and
middle
pressure
R717
R12
R22
R502
-70-0 <19.6
Applicable in the piston style
compressor of the
air-conditioner or the
freezing store system
Low temp.
and high
pressure
R13
R14
R23
R503
<-70 1.96-68.8
Applicable in the refrigerator
system with the temperature
lower than -70
℃
or the low
temperature parts of the
cascade multiple system
2. The requirement to the refrigerant