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- R-410A: 670 psig - R-22, R-404A, R-507, R-448A, R-449A: 500 psig • Certifications: UL/CSA and PED declaration TECHNICAL SUPPORT For additional technical information and to learn more about Sanhua’s full product line, please visit: sanhuausa.com INSTALLATION INSTRUCTIONS: RFGD, RFGF, RFGK SERIES TXV...