Determining the tonnage of an air conditioning compressor based solely on the Locked Rotor Amps (LRA) number is not possible. The Locked Rotor Amps (LRA) is a measurement of the current drawn by the compressor motor when it starts up from a standstill, and it is not directly indicative of the cooling capacity or tonnage of the air conditioner.
To determine the tonnage of an air conditioner, you typically need to refer to the manufacturer's specifications or labeling on the unit. The tonnage is typically expressed in BTUs (British Thermal Units) or in tons (1 ton = 12,000 BTUs). The information can usually be found on a data plate or sticker on the outdoor unit or in the product documentation.
If you are unable to locate the tonnage information on the unit or documentation, it is recommended to contact the manufacturer or consult with a qualified HVAC technician. They will have the expertise to accurately determine the tonnage based on the specific make and model of the air conditioning system.