What is one effective way to speed up the removal of refrigerant charge from a system?

Heating the recovery cylinder is an effective way to expedite the removal of refrigerant charge from a system. When the recovery cylinder is heated, the pressure inside it increases, which encourages the refrigerant to evaporate and move into the cylinder more quickly. This is particularly useful when dealing with refrigerants that may have low vapor pressures at room temperature, as raising the temperature can help ensure that they reach a higher vapor pressure, facilitating faster recovery into the cylinder.

In contrast, cooling the recovery cylinder would lead to a lower pressure inside the cylinder, which would actually slow the flow of refrigerant into it. Therefore, using heat to encourage the refrigerant movement is a more efficient option for accelerating the removal process.

Adding more refrigerant to the system does not aid in the recovery process and would complicate it further, as the goal is to remove the refrigerant rather than increase its volume in the system. Increasing the recovery pressure can be counterproductive, as it may lead to an imbalance or improper functioning of the recovery equipment.