Which action speeds up refrigerant recovery by affecting the recovery cylinder?

• A. Increase flow rate
• B. Use a larger hose
• C. Cool the recovery cylinder
• D. Use nitrogen

Answer: (C)

Cooling the recovery cylinder speeds up refrigerant recovery because it lowers the cylinder’s vapor pressure. When the cylinder is cooler, its internal pressure drops, increasing the pressure difference between the refrigerant source (the system) and the cylinder. That larger driving force pushes refrigerant into the cylinder more quickly, speeding up the transfer.

Other options don’t create as much driving force: simply increasing flow rate or using a larger hose won’t change the pressure in the cylinder as effectively, and introducing nitrogen isn’t a standard method for speeding recovery and can cause contamination. Heating the cylinder would raise its pressure and slow the transfer instead of speeding it.