What is the proper method for charging a system after cleanup according to the discussed guidelines?

• A. By weight.
• B. By pressure until a target gauge reading.
• C. By actual capacitor load.
• D. By refrigerant amount logged during service.

Answer: (A)

Charging by weight is the proper method. After cleanup, the system should be charged to the exact refrigerant mass specified on the equipment’s nameplate. Use a calibrated scale and tare the cylinder so you only measure what you actually add. This method accounts for the oil in the system, the length of the piping, and fittings, ensuring the system reaches the designed pressure–temperature relationship under operating conditions. It also avoids the inaccuracies of charging by pressure, which can vary with ambient temperature and liquid–vapor behavior. The compressor’s electrical load isn’t a reliable indicator of refrigerant amount, and while you may refer to service logs, they don’t replace the need to match the manufacturer’s stated charge and then verify with proper performance checks (superheat/subcooling and pressures).