Which parameter would you check to ensure proper refrigerant charge?

To ensure proper refrigerant charge in a cooling system, checking superheat and subcooling is essential because these parameters provide direct insights into the refrigerant's state as it moves through the system.

Superheat, which is the temperature of the refrigerant gas above its boiling point, indicates how effectively the evaporator is turning refrigerant into vapor. Assessing superheat allows technicians to confirm that enough heat is being absorbed by the refrigerant to facilitate effective cooling. If the superheat is too high, it may suggest that the system is low on refrigerant, leading to insufficient cooling and potential compressor damage.

Subcooling, conversely, measures the temperature of the refrigerant below its condensing point. This parameter ensures that the refrigerant is fully condensed into liquid before entering the expansion device. Adequate subcooling suggests that the system has sufficient refrigerant and that it is functioning efficiently. If there is too little subcooling, it could indicate either an undercharge of refrigerant or insufficient heat rejection in the condenser.

Evaluating both superheat and subcooling together provides a dual perspective on refrigerant charge and performance, guiding technicians in diagnosing operational issues and confirming that the system is functioning optimally. This dual-check methodology is