What is the purpose of a purge unit in a low pressure refrigeration system?

• A. To add refrigerant to the system
• B. To remove the air from the system
• C. To cool the refrigerant
• D. To increase system pressure

Answer: (B)

The purpose of a purge unit in a low-pressure refrigeration system is to remove the air and non-condensable gases from the system. Over time, air and non-condensables can infiltrate a refrigeration system, which can reduce efficiency, affect cooling performance, and potentially cause damage to the compressor. When these gases mix with the refrigerant, they can lead to pressure fluctuations and inadequate cooling.

The purge unit continuously monitors the refrigerant and separates the unwanted air and gases from the system. By effectively removing these components, the purge unit helps maintain optimal operating conditions, ensuring the refrigerant can function as intended, which ultimately leads to better efficiency and performance of the refrigeration system. This maintenance of the refrigerant purity is essential for system longevity and reliability.