Final answer:
Self-contained recovery devices are designed to remove refrigerant from appliances independently of the appliance's own components. They do not have their own power source requiring charging and are not limited to use on systems with less than 15 pounds of refrigerant.
Step-by-step explanation:
In addressing the question about self-contained recovery devices, the truthfulness of several statements must be considered. These devices are indeed designed to remove refrigerant from appliances, such as refrigerators and air conditioners, without the aid of the appliance's own components. Effectively, they function independently to extract and store refrigerant, ensuring the process is environmentally safe and compliant with relevant regulations.
The most accurate statement among the ones provided is that they remove refrigerant from an appliance without the assistance of components in the appliance. This means that they have their own mechanism to draw out refrigerant, which often includes a compressor and a collection container within the device itself, allowing for proper recovery and storage. They do not rely on a self-contained power source that requires periodic charging, as they are typically powered by connecting them to an external power source.
Furthermore, self-contained recovery devices are not limited by the amount of refrigerant within the appliance; they can often be used on a variety of systems regardless of the refrigerant quantity.