A manifold gauge set is the primary diagnostic tool used to monitor the pressures within an air conditioning system. It features two gauges—one for the low-pressure side and one for the high-pressure side—along with hoses for connecting to the unit. Technicians use these gauges to check the refrigerant charge and troubleshoot issues with the Condenser Coil. You can find technical specifications for the operating pressures of our units on the Technical Data page. These gauges are essential for ensuring that your Central Condenser is running within its safe and efficient design limits. Proper use of a gauge set can help identify a faulty Expansion Valve or a refrigerant leak. While some homeowners are curious about their system's pressure, these tools should only be used by EPA-certified professionals. They are the key to fine-tuning the performance of any Ductless Mini Split.