It is not common practice to add oil to a water-cooled air conditioner. In traditional air conditioning systems, oil is used in the compressor to lubricate its moving parts and ensure proper functioning. However, this oil is typically sealed within the compressor and should not need to be regularly added or replenished during the system's normal operation.
Water-cooled air conditioners use water as a heat exchange medium to dissipate heat from the refrigerant in the system. The water circulates through a cooling tower or a heat exchanger, where it absorbs the heat from the refrigerant, which, in turn, cools down and condenses. There is no need to add oil to the water in this type of cooling system.
If you find yourself in a situation where oil needs to be added to an air conditioner, it may be an indication of a malfunction or a leak in the refrigerant system. In such cases, it is essential to contact a qualified HVAC technician to diagnose and address the issue properly. Attempting to add oil without understanding the system's specific requirements could lead to further damage and potentially compromise the system's efficiency and safety.