EPA Type 2 Practice Test

The main idea here is how different refrigerant recovery methods work and why a size limit matters. System-dependent recovery equipment relies on the appliance’s own compressor to move refrigerant into the recovery cylinder. Because it depends on the appliance’s own system, this method becomes impractical for larger charges—the recovery rate is slow and there’s a higher risk of incomplete recovery or other issues when the appliance holds more than about 15 pounds of refrigerant.

For larger appliances, you need a recovery unit that doesn’t rely on the appliance’s compressor—one that has its own power and compression to pull refrigerant out efficiently. That’s why a self-contained (and similar independent) unit is used for bigger systems. In short, using a system-dependent setup on an appliance with more than 15 pounds of refrigerant isn’t appropriate or compliant, which is why the correct approach is to employ a recovery method that is independent of the appliance’s own system.