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How to Add R-410 Refrigerant By Robert Sylvus An azeotrope refrigerant blends multiple refrigerant compounds to form a single refrigerant. Most refrigerant blends boil at different rates and require complete evacuation before adding a full charge. This is not the case with so R-410, which is considered a near-azeotrope, using compounds that boil at almost the same rate. Manufacturers include a refrigerant charge in new air conditioning systems that will provide the correct amount of refrigerant for the unit and a 15 to 25 foot refrigerant line set. Long line sets, the copper lines that the refrigerant travels through, will require additional R-410 refrigerant. ... R-410 refrigerant operates at a higher pressure than R-22. Step 1 Turn the air conditioning system off at the thermostat. Step 2 Check the identification tag on the outdoor condensing unit to verify the system uses R-410 as a refrigerant. Mixing R-410 with any other refrigerant will cause the compressor to seize...