A nitrogen pressure test is a critical step where an HVAC Pro pumps dry nitrogen into the system to check for leaks before adding refrigerant. This test ensures that all Flare Nut connections are tight and that the copper tubing hasn't been compromised. Nitrogen is used because it is dry and stable, helping to absorb any lingering moisture during the Evacuation Process. Skipping this step can lead to slow leaks that eventually damage the Inverter Compressor. You can find technical requirements for this test in the Technical Data section for Cooper&Hunter. A successful pressure test is a key requirement for maintaining your Warranty Policy. It provides peace of mind that your Multi-Zone system is perfectly sealed. This practice is essential for any high-performance Heat Pump System.