Which condition allows for the use of both high and low access sides in refrigerant recovery?

The use of both high and low access sides in refrigerant recovery is permitted when the compressor is not operational. When the compressor is not running, there is no pressurization on either side of the system, allowing the technician to safely connect recovery equipment to both sides of the system. This method effectively facilitates the removal of refrigerant from the entire system, ensuring both the evaporator and condenser can be emptied of refrigerant, which is essential for compliance with regulations and ensuring safety during maintenance or repairs.

In other scenarios, such as if the compressor is running, the system is under pressure, which could pose safety risks. If the compressor is failed, certain connections may still be under pressure, complicating the recovery process. During compressor maintenance, similar issues arise regarding pressure and the risk of refrigerant leaks, thus limiting access options for refrigerant recovery.