What is the maximum test pressure to use for pressurizing type 3 centrifugal systems with nitrogen?

• A. 15 psig
• B. 20 psig
• C. 10 psig
• D. 5 psig

Answer: (C)

The maximum test pressure for pressurizing type 3 centrifugal systems with nitrogen is 10 psig. This specification is important because maintaining the appropriate pressure during testing helps ensure the integrity of the system is evaluated without causing damage. Type 3 systems, which are predominantly tested for leaks during maintenance or repair, require a careful approach to pressure levels to avoid false readings or system compromise.

Using nitrogen as the pressurizing medium is standard practice because it is an inert gas, reducing the risk of reactions within the system. Adhering to the 10 psig limit helps maintain safety and effectiveness during leak detection procedures. Higher pressures could potentially lead to unintended alterations in system components or inaccurate results, while lower pressures might fail to adequately test for leaks. Recognizing these parameters is essential for technicians working with refrigeration and air conditioning systems.