The refrigerant charge can be checked very accurately without gauges using a quality thermometer and manufacturer's charging chart. The capacity in Btuh can be calculated, determining if the unit is ...

READ MORE ABOUT • Refrigerant Charging • Liquid Refrigerant • Service and Maintenance Today it is common practice to remove a 400 Series refrigerant from a cylinder in its liquid phase to prevent a ...

This amounts to a refrigerant charge of 9.7g/kW, roughly equivalent to the amount of propane in five cigarette lighters. Because it uses less propane, which is flammable, the new circuit is safer.