In this instance, I will talk to you about a potential issue that an air conditioner may face when the amperage is lower than normal, meaning the current of the unit is less than the equipment’s nameplate value.
Let’s consider a hypothetical example of an air conditioning unit that should consume 4.6 amperes. If the amperage is only slightly lower, for example, 4 amperes or 3.9 amperes, we can say that the compressor is working well and cooling properly. In this case, there should be no cause for concern.
If the amperage is significantly lower, such as 2.9 amperes, 2.8 amperes, or even 2.7 amperes, this indicates another issue. It could be due to a dirty air filter or a dirty indoor unit coil, which restricts the airflow and reduces the pressure in the system, resulting in lower amperage. In this case, it is recommended to perform maintenance to clean the coil.
Check the speed of the fan blade; if it’s slow, inspect the fan capacitor.
Another cause could be an obstruction in the air turbine, preventing proper airflow through the coil. This can also result in lower amperage and may lead to the unit freezing up.
Furthermore, the lack of refrigerant or insufficient refrigerant charge can lead to lower amperage. This can be verified by measuring the refrigerant pressure and comparing it with the recommended values for the unit.
If, on the other hand, the amperage is extremely low, such as 0.9 amperes or 1 ampere, this may indicate that the compressor is not compressing correctly. There could be a complete lack of refrigerant in the system or a mechanical failure in the compressor.
When the amperage is very low, and the refrigerant pressure does not rise when the unit is turned on, it is likely that the compressor is not compressing the refrigerant or circulating properly. In this case, the solution may be to replace the compressor.
Remember that on cooler days or in locations with lower thermal loads, such as places with fewer occupants, it is normal for the power consumption to be lower than usual, although not significantly below the rated value.