What must be done when recovering less than 200 lbs of R-22 after Nov. 15, 1993?

When recovering less than 200 lbs of R-22, it is essential to take the system down to 0 psig. This requirement is in line with the regulations put forth by the Environmental Protection Agency (EPA) concerning the recovery of refrigerants.

Taking the system down to 0 psig ensures that all of the refrigerant is removed from the system, thus minimizing any potential release of R-22 into the atmosphere, which is a substance known to deplete the ozone layer. This practice is critical in adhering to responsible refrigerant management and environmental protection.

While options such as bringing the system down to 10" hg may sound like a feasible approach, it might not guarantee the complete recovery, as there could still be some refrigerant left in the system. Similarly, stating that the system requires no specific pressure does not align with best practices for refrigerant recovery, and pressure testing is not directly relevant to the recovery process. Thus, reaching 0 psig is the confirmed standard for ensuring that the recovery is effective and environmentally compliant.