Chemistry, 12.07.2019 18:00 haleydanielle8

Two technicians are discussing refrigerant lines. technician a says that line connections must be tight but not so tight that air can't get through. technician b says that all connection o-rings have to be replaced when retrofitting a system to r-134a. who is correct?

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Two technicians are discussing refrigerant lines. technician a says that line connections must be ti...