Refrigerant Temperature (°C) R410A R22
-20 0.30 0.14
0 0.70 0.40
20 1.35 0.81
40 2.32 1.43
60 3.73 2.33
65 4.15 2.60
D. R410A refrigerating machine oil / Conventionally, mineral oil or
a synthetic oil such as alkylbenzene has been used for R22
refrigerating machine oil. Because of the poor compatibility
between R410A and conventional oils like mineral oil,
however,there is a tendency for the refrigerating machine oil to
collect in the refrigerating cycle. For this reason, polyester and
other synthetic oils which have a high compatibility with R410A
are used as refrigerating machine oil. / Because of the
highhygroscopic property of synthetic oil, more care must be
taken in its handling than was necessary with conventional
refrigerating machine oils. Also, these synthetic oils will
degrade if mixed with mineral oil or alkylbenzene, causing
clogging in capillarytubes or compressor malfunction. Do not
mix them under any circumstances.
10.1.2. Safety Measure When Installing / Receiving Refrigerant Piping
Cause the gas pressure of R410A is approximately 1.6 times as high as that of R22, a mistake in
installation or servicing could result in a major accident. It is essential that you use R410a tools
and materials, and that you observe the followingprecautions to ensure safety.
1. Do not use any refrigerant other than R410A in ACs that have
been used with R410A.
2. If any refrigerant gas leaks while you are working, ventilate the
room. Toxic gas may be generated if refrigerant gas is exposed to
a direct flame.
3. When installing or transferring an AC, do not allow any air or
substance other than R410A to mix into the refrigeration cycle. If
it does, the pressure in the refrigeration cycle can become
abnormally high, possibly causing an explosion and/orinjury.
4. After finishing the installation, check to make sure there is no
refrigerant gas leaking.
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