What is the minimum vacuum requirement for an empty refillable refrigerant tank?

The minimum vacuum requirement for an empty refillable refrigerant tank is 27 inches of mercury. This vacuum level is essential to ensure that any residual refrigerant and moisture in the tank are effectively removed before refilling. If the vacuum is insufficient, there is a risk of contamination within the system, which can lead to efficiency issues and damage to the equipment. Additionally, a strong vacuum helps in preventing the ingress of air and moisture, addressing two of the most common issues that can occur when filling refrigerant tanks.

Understanding vacuum levels in refrigerant systems is vital for technicians because proper handling and maintenance of refrigerants are crucial for system efficiency and environmental safety.