What feature defines a self-contained recovery unit and sets it apart from the system-dependent kind?
Correct Answer
A) It carries its own compressor and pump, so it can draw refrigerant out without help from the appliance
Self-contained recovery equipment is active equipment: it has its own compressor and can pull refrigerant out of an appliance whether or not the appliance's compressor runs. System-dependent equipment is passive and depends on the appliance's compressor and internal pressure to push refrigerant into the container. That difference decides how fast the job goes, whether a seized compressor is a problem, and whether the equipment can legally be used on appliances above fifteen pounds.
Why This Is the Correct Answer
The defining feature is an onboard compressor. Because a self-contained unit generates its own pressure difference, it can recover from an appliance with a dead or seized compressor and it is not limited to the smallest systems the way passive equipment is.
Why the Other Options Are Wrong
Option B: It stores recovered refrigerant in a non-pressurized bag rather than in a cylinder
Recovered refrigerant has to go into a DOT-approved recovery cylinder. No approved recovery unit stores refrigerant in a non-pressurized bag, and that detail does not distinguish the two equipment types.
Option C: It plugs into the appliance's own wiring so that both machines start at the same time
Recovery machines are powered independently of the appliance. Nothing in either equipment type ties the machine's power supply to the appliance's wiring.
Option D: It filters and dries the refrigerant to purity standards before it is returned to service
Cleaning refrigerant to a purity standard describes recycling and reclamation equipment. A recovery unit's job is to remove refrigerant and store it, not to restore it to specification.
Memory Technique
Self-contained carries its own pump the way a self-contained diver carries his own air. System-dependent has to breathe through the appliance.
Reference Hint
40 CFR 82.152 definitions of self-contained and system-dependent recovery equipment.
More epa-608-type-1 Questions
A technician certified under Section 608 is asked to service the air conditioning system in a customer's pickup truck. What credential does that particular job actually require?
Facing an unfamiliar packaged refrigeration unit on the bench, how should a technician decide whether the small appliance rules apply to it?
When system-dependent recovery equipment is used on a small appliance whose compressor still runs, how can that working compressor be put to use?
Recovery from a small appliance has slowed down and the pressure is barely moving. What accepted technique helps drive the remaining refrigerant out?
After the recovery unit stops pulling on a small appliance, how does a technician confirm that the recovery is actually complete?
A sealed small appliance offers no service port at all. What has to happen before recovery equipment can be connected to it?
As refrigerant from a string of small appliances collects in a recovery cylinder, what fill limit applies to that cylinder?
A technician recovers R-134a into a cylinder that still holds recovered R-12 from an earlier job. What is the consequence for that refrigerant?
Refrigerant recovered from a small appliance is going back into service once the repair is finished. When may it be reused without first being sent to a reclaimer?
Why does system-dependent recovery generally take longer to finish than recovery performed with a self-contained machine?
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