AC Startup Procedure: Weighing In Refrigerant on a New Trane System

A new Trane condenser sits against a brick wall, freshly installed. On the ground beside it, a refrigerant cylinder rests on a digital scale, with hoses running to the unit's service valves.

The scale tracks exactly how much refrigerant leaves the cylinder, so the tech can add a measured amount instead of guessing. A digital manifold, the gauge set, shows live system pressures and line temperatures. Those numbers tell the tech whether the charge is right before the job is signed off.