A certificate of test is required for refrigeration systems containing how many pounds or more of refrigerant?

For refrigeration systems, a certificate of test is required when the system contains 50 pounds or more of refrigerant. This regulation is in place to ensure that proper safety and maintenance protocols are followed for systems that could potentially leak refrigerants. The threshold is significant because systems containing high amounts of refrigerant are associated with greater environmental risks and operational complexities.

The certification process helps to verify that the system has been tested for leaks and operating efficiency, contributing to both environmental protection and safety standards. Understanding the required certifications also emphasizes the importance of compliance with applicable regulations to avoid penalties and ensure the proper handling of refrigerants in HVAC applications.