Panasonic CU-E18CKR Service Manual page 51

a
15°C
b 18°C
c
25°C
9. Operating Instructions
10. Installation And Servicing Air Conditioner Using
R410A
10.1. OUTLINE
10.1.1. About R410A Refrigerant
1. Converting air conditioners to R410A / Since it was declared
in1974 that chlorofluorocarbons (CFC), hydro
chlorofluorocarbons (HCFC) and other substances pose a
destructive danger to the ozone layer in the earth~s upper
stratosphere (20to 40 km above the earth), measures have been
taken around the world to prevent this destruction. / The R22
refrigerant which has conventionally been used in ACs is an
HCFC refrigerant and, therefore, possesses this ozone-destroying
potential. Internationalregulations (the Montreal Protocol Ozone-
Damaging Substances) and the domestic laws of various
countries call for the early substitution of R22 by a refrigerant
which will not harm the ozone layer.
- In ACs, the HFC refrigerant which has become the
mainstream alternative called R410A.Compared with R22, the
pressure of R410A is approximately 1.6 times as high at the
same refrigerant temperature, but the energy efficiency is
about thesame. Consisting of hydrogen (H), fluorine (F) and
carbon (C), R410A is an HFC refrigerant. Another typical HFC
refrigerant is R407C. While the energy efficiency of R407C is
some what inferior to that of R410A, it offers the advantage of
having pressurecharacteristics which are about the same as
those of R22, and is used mainly in packaged ACs.
2. The characteristics of HFC (R410A) refrigerants
A. Chemical characteristics / The chemical characteristics of
R410A are similar to those of R22 in that both are chemically