How much of quantity of nitrogen is to be filled for 1.5 ton split ac?

For a 1.5 ton split AC, approximately 2.5 to 3.0 kg of refrigerant (often R-32 or R-410A, which contain nitrogen) is typically needed, depending on the specific model and design. It's important to refer to the manufacturer's specifications for the exact quantity required. Additionally, nitrogen is often used for pressure testing and purging the system, but the amount needed for that is separate from the refrigerant charge. Always consult a professional technician for accurate measurements and handling.