Performed a 20-point precision tune-up on a Carrier Infinity zoned system. Used a Fieldpiece SRL8 refrigerant scale to weigh in the proper R-410A charge per data plate. Measured static air pressures and calculated 400 CFM per ton across the indoor coil. Treated the condensate drain with Pan-Treat to prevent clogs. Cycled the zone dampers and checked damper motor volt-amps. Cleaned the blower wheel and checked temperature split across the coil. Verified safe operating parameters on all zones before leaving. System operating efficiently.