A system-dependent recovery unit is being used on a small appliance, and the transfer has nearly stopped because the pressures on the two sides have evened out. Which accepted step restores the difference that drives refrigerant across?
Correct Answer
A) Setting the recovery cylinder in ice water, which drops its pressure below the appliance's
System-dependent recovery has no pump of its own. Refrigerant moves only because the appliance side is at a higher pressure than the cylinder side, and once those two even out the transfer stalls. Chilling the cylinder lowers the saturation pressure of the refrigerant already inside it, which reopens the gap and pulls the remainder across. Warming the appliance works from the other end and is used the same way. What must never be done is heating the cylinder, which raises its pressure and stops the transfer entirely while creating a real hazard.
Why This Is the Correct Answer
Passive recovery is driven entirely by the pressure difference between the appliance and the receiving cylinder, because there is no compressor in the recovery device to create one. Cooling the cylinder lowers the saturation pressure of its contents, so the appliance side becomes the high side again and flow resumes. Ice water is the usual field method because it is cheap, controllable and cannot overshoot.
Why the Other Options Are Wrong
Option B: Raising the recovery cylinder above the appliance so the refrigerant runs downhill into it
Refrigerant moves on pressure difference, not gravity, and the amount of head available from a cylinder's height is negligible against saturation pressures of tens of pounds.
Option C: Wrapping the recovery cylinder in a heat blanket so the transfer is pushed along faster
Heating the receiving cylinder is exactly backward. It raises the cylinder pressure, stops the transfer, and creates a pressure hazard in a container that is already close to its fill limit.
Option D: Opening a second hose to the room briefly so the trapped pressure has somewhere to go
Bleeding pressure to the room is a knowing release of refrigerant. It is a venting violation, and it removes the very refrigerant the job exists to capture.
Memory Technique
The refrigerant always walks toward the cold. Make the cylinder the coldest thing in the room.
Reference Hint
System-dependent recovery is driven by pressure difference alone. Chill the receiving cylinder or warm the appliance, never heat the cylinder.
More epa-608-type-1 Questions
An under-counter ice maker is one factory-sealed cabinet, while a modular ice machine head is joined to a remote condenser by field-run tubing. What certification does servicing the modular machine's circuit require?
A technician recovers refrigerant from a small appliance using a recovery machine that was manufactured in 1991. What recovery level must that older equipment achieve?
Two technicians recover from identical refrigerators with working compressors, one using a 1991 recovery machine and the other a 2015 machine. Why do their required recovery levels differ?
System-dependent recovery equipment may be used only on appliances that normally hold up to what amount of refrigerant?
What feature defines a self-contained recovery unit and sets it apart from the system-dependent kind?
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?
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