I show how to measure the refrigerant charge level using the NAVAC Inc. - HVAC Tools Division NX1 Digital Manifold with the subcooling method! This is because the system is equipped with a TXV. We measure total superheat to make sure the TXV is operating properly! . . . #acservicetech #acservice #sponsored #navac #hvac #hvacr #hvactraining #hvactools #charge #refrigerant #acunit #actraining #hvactech #hvactechnician #technician #TXV #superheat | AC Service Tech LLC