For which appliance would it be permissible to use a passive recovery device for refrigerant recovery?

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Multiple Choice

For which appliance would it be permissible to use a passive recovery device for refrigerant recovery?

The key idea is that passive recovery devices are meant for very small refrigerant charges, where the natural pressure differences in the system can pull the refrigerant out without needing a powered recovery machine. Domestic refrigerators typically have a small charge, so using a passive device to capture the refrigerant is allowed and practical. Larger appliances—like centrifugal air conditioners, large reciprocating liquid chillers, or a big commercial walk-in freezer—contain much more refrigerant and operate at higher pressures. In those cases, a powered recovery device is required to actively extract and direct the refrigerant into a recovery cylinder, meeting the needed recovery efficiency and regulatory requirements.

The key idea is that passive recovery devices are meant for very small refrigerant charges, where the natural pressure differences in the system can pull the refrigerant out without needing a powered recovery machine. Domestic refrigerators typically have a small charge, so using a passive device to capture the refrigerant is allowed and practical.

Larger appliances—like centrifugal air conditioners, large reciprocating liquid chillers, or a big commercial walk-in freezer—contain much more refrigerant and operate at higher pressures. In those cases, a powered recovery device is required to actively extract and direct the refrigerant into a recovery cylinder, meeting the needed recovery efficiency and regulatory requirements.

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