On a compressor changeout the technician first pulls the charge into a cylinder, and later, after the new compressor is brazed in, pulls the system down with a vacuum pump. What separates those two operations?
Correct Answer
B) Recovery moves the refrigerant out into a container, while evacuation removes the air and moisture left in the empty system
Recovery is the removal of refrigerant from an appliance into an external container. It is a refrigerant-handling job done with a recovery machine and a recovery cylinder, and it is what the rules require before the system is opened. Evacuation happens afterward, once the system is empty and the repair is finished. A vacuum pump pulls the remaining air and moisture out to atmosphere so that only clean refrigerant goes back in. Different machine, different purpose, different point in the job.
Why This Is the Correct Answer
Recovery captures refrigerant into a container so it is never released. Evacuation deals with what is left behind after the refrigerant is gone, mainly air and water vapor, and it discharges to atmosphere through the vacuum pump because there is no refrigerant left in the system to protect.
Why the Other Options Are Wrong
Option A: Recovery removes the air and moisture from the system, while evacuation pulls the refrigerant charge out into a cylinder
This reverses the two operations. The refrigerant comes out first with a recovery machine and a cylinder, and only afterward does a vacuum pump remove the air and moisture from the empty system.
Option C: They describe the same operation, carried out with two different machines at two points in the same job
They are separate steps with different purposes at different points in the job. A recovery machine cannot pull a deep vacuum, and a vacuum pump must never be used to remove refrigerant from a charged system.
Option D: Recovery applies only to low-pressure appliances and evacuation only to high-pressure appliances, so a rooftop unit gets one of them
Both operations are performed on both classes of appliance. Technique differs between a rooftop unit and a low-pressure chiller, but neither recovery nor evacuation belongs exclusively to one class.
Memory Technique
Recovery saves the refrigerant. Evacuation removes the junk. Cylinder first, pump second.
Reference Hint
40 CFR 82.152 defines recover as removing refrigerant from an appliance and storing it in an external container. Evacuation levels are addressed in 40 CFR 82.156.
More epa-608-type-2 Questions
A walk-in cooler condensing unit holds a full charge of twenty-five pounds of R-404A, which is below the fifty pound threshold that brings an appliance under the leak repair provisions. What still applies to this unit?
An office building has thirty water source heat pumps on a common water loop, and each one left the factory assembled, hermetically sealed and charged with four pounds of R-410A. How is one of those units classified?
A data sheet for an unfamiliar refrigerant lists a boiling point of about fifty-five degrees Fahrenheit at atmospheric pressure. What does that tell a technician holding Core and Type II certification?
A technician holds Core, Type I and Type III certification and is sent to recover the charge from a twenty ton rooftop unit charged with R-410A. What does that combination of sections allow on this job?
A fleet garage technician holds only the vehicle air conditioning certification issued under Section 609 and is asked to recover the charge from the shop's own rooftop air conditioner. What does that credential allow?
A split system's outdoor unit, indoor coil and the line set the installer ran and brazed between them are being considered. For the purposes of the refrigerant rules, what makes up the appliance here?
On a new installation the line set is brazed to a factory charged outdoor unit and an indoor coil shipped under a nitrogen holding charge, with the outdoor unit's service valves still closed. What does the recovery requirement call for before that brazing?
A rooftop unit's data plate has weathered until the charge figure cannot be read, and the technician needs the full charge to place the appliance under the evacuation and leak provisions. Where should that figure come from?
A computer room air conditioning unit holds forty pounds of R-407C and connects to a remote air cooled condenser through refrigerant piping run and brazed by the installer. How is that unit classified?
A shop's office manager, who holds no technician certification, is sent to a supply house to pick up a new recovery machine for the commercial crew. What does the sales restriction require at that counter?
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