What certification level includes the ability to work on both low and high pressure appliances?

The correct answer is the Universal certification level, which encompasses the ability to work on all types of refrigerant appliances, including both low and high-pressure systems. This certification allows technicians to handle a wide range of equipment, such as comfort cooling systems, commercial refrigeration units, and other advanced appliances that utilize various types of refrigerants, including the low-pressure and high-pressure categories.

The Universal certification is comprehensive and requires knowledge of all aspects of refrigerant handling, recovery, and disposal for different types of equipment, ensuring that technicians are prepared to satisfy the diverse needs of the HVAC and refrigeration industry.

In contrast, Type I certification limits the technician to working on small appliances containing less than 5 pounds of refrigerant. Type II certification permits work on high-pressure systems but does not include low-pressure systems. Type III is focused solely on low-pressure refrigeration. Therefore, only the Universal level certification provides the full breadth of capabilities required to work on both low and high-pressure appliances.