HVAC - EPA Certification Practice Exam

What types of access fittings are used for sealed systems?

1. Permanently soldered fixtures

2. Piercing type access fittings

3. Standard valve fittings

4. Non-sealed fittings

The correct answer is: Piercing type access fittings

Piercing type access fittings are specifically designed to create a temporary access point in sealed refrigeration and air conditioning systems. These fittings have a sharp point that can penetrate the wall of the system's tubing or piping, allowing the technician to access the refrigerant without needing to cut or otherwise alter the system more permanently. This method is particularly useful for service tasks such as refrigerant recovery, pressure testing, or adding refrigerant. The fitting remains on the system but can be sealed with a cap when not in use, thereby maintaining the integrity of the sealed system and preventing leaks. Permanently soldered fixtures are fixed and do not provide the temporary access required during service, while standard valve fittings may not provide a way to easily access or withdraw the refrigerant. Non-sealed fittings, as the name implies, do not maintain system integrity and are not suitable for use in systems that require refrigeration or air conditioning. Thus, piercing type access fittings are essential for safely and effectively servicing sealed systems.