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The R-22-nitrogen leak test gas is not subject to the prohibition on venting because in these cases, the ozone-depleting compound is not used as a refrigerant.īefore nitrogen can be added to R-410A system, the system MUST be evacuated to 0.0 psig. Also, Nitrogen is a preferred gas used in this process as it will not harm the environment and does not support combustion or oxidation, as does air or oxygen. Only mixtures of nitrogen and R-22 can be used as a leak-test gas (trace gas) in an R-410A system. Hence Nitrogen should be used for leak testing or pressurizing a system. Since certain concentrations of R-410A with air can become combustible, it is advisable to never mix R-410A with air or oxygen for either leak testing or pressurizing a system.

So these require high pressure testing by Nitrogen gas prior to filling of refrigerant, so as to avoid unnecessary venting of refrigerant, systems should be leak checked with pressurized Nitrogen before charging.

Unlike refrigerants that contain Bromine or chlorine, R-410A does not contain chlorine at all, therefore its ozone depletion potential (ODP) is zero, consequently becoming the most widely used as the preferred refrigerant for use in residential and commercial air conditioners in many countries world over and sold under the trademarked names such as Forane 410A, Puron, EcoFluor R410, Genetron R410A, and AZ-20, is a zeotropic, but near-azeotropic mixture of difluoromethane (CH2F2, called R-32) and pentafluoroethane (CHF2CF3, called R-125), which is used as a refrigerant in air conditioning applications.Īir conditioners working on R-410A operate at much higher pressure than other refrigerants (R-410A operates at pressures 50 to 70% higher than those of R-22). So by choosing an R-410A system now, you can plant ahead with an ozone-friendly solution. Availability of R-22 supplies may become short in the coming years.

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