Panasonic CS-DZ50VKE Service Manual

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Panasonic CS-DZ50VKE Service Manual Manual pdf 62 page image

6213. Installation and Servicing Air Conditioner using R3213.1 About R32 RefrigerantFor air conditioning refrigerants such as R410A, the refrigerants were collected back in order to prevent their airdissipation, to curbe the global warming impact, in case they were released into the atmosphere. In the “4thEnvironmental Basic Plan”, 80% reduction of greenhouse gas emissions by 2050 is required, and due to thisrequirement, further reduction in the emission of high greenhouse effect gas, such as CFCs, is required. Therefore,the conversion of air conditioning refrigerant into the ones who has smaller greenhouse effect, even if it is dissipatedinto the atmosphere, became our responsibility.Nevertheless, in case of air conditioning refrigerant, it would be the best if there is a refrigerant which has smallerimpact on global warming, but ensures good energy efficiency and performance, and is safe; however, there is nosuch refrigerant which satisfies all these conditions. As a result, we have been considering the practical usage, withinthe safety frame-work, of R32 refrigerant which has short lifetime in the atmosphere, and has smaller effect of globalwarming, but is slightly flammable.In 2004, due to the revision of air conditioner safety standards by the International Electro-safety Commission (IEC),the safety standards of air conditioners using slightly flammable refrigerant was issued. In 2010, the regulations ofAmerican Society of Heating, Refrigerating and Air-Conditioning Engineers in the United States (ANSI/ASHRAE34)was issued adopting the grades for refrigerants which are difficult to inflame due to their slow burning rates, and as aresult have smaller damages in cases of fire. The burning rate of R32 is lower by 10cm / per second, and safetystandardization for various usage is now being processed.13.2 Characteristics of R32 Refrigerant1. Chemical CharacteristicsR32 is one of the refrigerants used in R410A, has almost no toxicity, and chemically stable compound formed byhydrogen, carbon and fluorine.R32 has short lifetime of 4 to 9 years in case of being released into the atmosphere; therefore, it has smallergreenhouse gas effect but has slight inflammability because of the large proportion of hydrogen.Chemical Characteristic Table of R32, R410A and R22.R32 R410A R22Chemical Formula CH2F2 CH2F2 / CHF2CF3 CHCLF2Composition(mixture ratio wt.%) Single Composition R32 / R125A Single Composition(50 / 50 wt.%)Boiling Point (°C) -51.7 -51.5 -40.8Pressure (physical) *1 3.14 3.07 1.94Capacity (physical) *2 160 141 100COP (physical) *3 95 91 100Ozone Depletion Potential (ODP) 0 0 0.055Global Warming Potential(GWP) *4 675 2090 1810Inflammability *5 Slightly Inflammable(A2L) Non-inflammable (A1) Non-inflammable (A1)Toxicity None None None*1：Physical property of temperature condition 50°C*2：Relative value of temperature condition 0/50°C, providing R22=100*3：Te/Tc/SC/SH=5/50/3/0°C*4：GWP=Global Warming Potential, each figure is based on “4 th IPCC4 Report”*5：Based on ANSI / ASHRAE std. 34-2010