AUX air conditioner service manual
10
specific type and temperature of the lubricating oil.
The capacity per unit of R22 is almost same as the one of R717 while it will be higher than R22
under a low temperature.R22 is usually applied in the middle temperature refrigerating systems with
the object lowest refrigerating temperature of up than -60℃.
⑵ The property of the replacement cold medium of R407C, R410a, etc.to R22
The properties comparison between R410A, R407C and HCFC22 is listed in table 2-2. We can make a
conclusion as the below after checking through this table:
①The environment-protection condition of the replacement cold medium is superior than R22 and
conforming to the safety requirement.
② R407C is non-azeotrope and need to be rectified according to the specific condition in
air-conditioner design, production and maintenance process; R410A is sub-azeotrope and basically
can be treated as R22.
③The pressures of R407C、THR03 and R22 are basically same. But the one of R410A is higher than
R22’s by 60%;
④The lubricating oil for the replacement cold medium is different from the one for R22 and need to
be changed completely. However, due to the water-absorption of the Polyarylether, the control on
drying process must be strict;
⑤R407C, THR03 and R22 are basically same on the aspect of the capacity per unit refrigerant. The
capacity per unit refrigerant of R410A is more than R22 by 40～50％.
Table 1-4 the basic property of the replacement cold medium
Property R-22 R-410A R-407C
R-22 R32/R125
R32/R125/
R134a
The makeup of the cold medium
（Mass ratio ％）
100 50/50 23/25/52
Ozone’s destruction
Potential (ODP)
0.05 0 0
Environment
Condition
Greenhouse GWP（100
years）
1730 1700 1530
Toxicity No No No
Safety
Inflammability No No No
Azeotrope property ---
Sub-
Azeotrope
Non-
Azeotrope
Boiling point（℃） -40.8 -52.7 -43.7
Thermophysical
Properties
Critical temp.（℃） 96.1 72.5 87.3
Condensing pressure（Mpa） 2.17 3.38 2.31
Evaporating pressure（Mpa） 0.62 1.00 0.64
Pressure ratio 3.50 3.38 3.59
Refrigerating
Property
Exhaust Temp.（℃） 97.2 95.1 86.7
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