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Can't. Difluoromethane r-32 is not suitable as a direct replacement for refrigerant r410 and should only be used in systems designed for difluoromethane r-32.
Refrigerant r410 is not designed to operate with flammable refrigerants and requires extensive modifications and laboratory validation to confirm that the safety level has been increased to the level required by international standards set for systems using difluoromethane r-32.
Not only the electrical components must meet the mandatory safety requirements for the refrigerant used (ie AS/NZS 60335.2.40), but the entire air conditioner. This includes surface temperature, operating and installation instructions, marking and warning labels, mechanical strength, and more. Anyone making a conversion or modification assumes the responsibility of the designer/manufacturer and must therefore demonstrate that the modified product complies with all applicable codes and standards.
Refrigerant R410 compliance with AS/NZS 60335.2.40 can only be determined by physical testing in a laboratory, and AS/NZS 5149.1:2016 has refrigerant charge restrictions. Therefore, it is difficult for any technician to confirm compliance.
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