Before recovering, a technician front seats the receiver outlet valve and runs the system until the low side pressure falls, storing most of the charge in the receiver. What has that accomplished for the recovery that follows?
Correct Answer
C) It leaves only the low side charge to be pulled out through the machine
A pump down concentrates the charge in the receiver and the high side behind a closed valve, so the section that will actually be opened holds very little refrigerant. The recovery machine then has far less to pull, and the job goes faster. What a pump down does not do is replace recovery or evacuation. The section being opened still has to reach the level the table sets for that appliance before a joint is broken.
Why This Is the Correct Answer
Storing the charge behind the receiver outlet valve shrinks the volume of refrigerant that the recovery machine has to handle, because only what remains in the low side and the section being opened has to come out. It is a time-saving step, not a substitute for anything. The evacuation level still applies to whatever part of the appliance is going to be opened.
Why the Other Options Are Wrong
Option A: It removes the need to reach any evacuation level on that appliance
The section that gets opened still has to reach its required level. Storing charge elsewhere in the same appliance changes the quantity, not the rule.
Option B: It satisfies the evacuation requirement without using a recovery machine
A pump down moves refrigerant inside the appliance. Nothing has been removed from the appliance, so no evacuation requirement has been met.
Option D: It transfers the charge into storage that counts as a recovery cylinder
The receiver is part of the appliance, not a recovery cylinder. Refrigerant sitting in it has not been recovered in any sense the regulation recognizes.
Memory Technique
Moving it is not removing it. The receiver has an address inside the system, not outside it.
Reference Hint
Pumping down stores charge inside the appliance; the section to be opened still needs its required evacuation level.
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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Previous Question
A technician keeps the recovery cylinder on a scale throughout a recovery job instead of judging the fill level by lifting the cylinder. What is that scale there to prevent?
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A process cooling system charged with R-22 lists a normal charge of exactly two hundred pounds, and the recovery machine is a current model. Which row of the evacuation table covers an appliance sitting precisely on the boundary?