After a low-pressure machine has reached the required level and the charge is out in cylinders, the technician wants to pull it deeper still to dry it out. Is a plain vacuum pump allowed for that?
Correct Answer
C) Yes, because the refrigerant is already out and the pump is only removing air and moisture
The prohibition is on releasing refrigerant, and the requirement to use certified recovery equipment covers removing the charge. Once the appliance has reached the required level and the charge is in cylinders, what a vacuum pump moves is air and water vapor. Dehydrating a machine with a vacuum pump at that point is normal practice and is not a release. What is not allowed is using a vacuum pump instead of recovery equipment while refrigerant is still in the machine.
Why This Is the Correct Answer
Recovery equipment is required to take the charge out, and the appliance has to reach the required level before it is opened. Beyond that point the machine holds air and moisture rather than a refrigerant charge, and a vacuum pump discharging to the room is not venting refrigerant. Dehydration after recovery is a separate operation from recovery itself.
Why the Other Options Are Wrong
Option A: No, because a vacuum pump may never be connected to an appliance that has held refrigerant
Vacuum pumps are standard chiller tools, used after recovery and after a machine has been opened. The rule limits when they may be used, not whether they may touch the appliance at all.
Option B: Yes, but only if the pump discharge is piped into a recovery cylinder to catch what it moves
Piping a vacuum pump's discharge into a cylinder is neither required nor practical, and it would stall the pump against the cylinder pressure almost immediately.
Option D: No, because any pull below the required level must be made with certified recovery equipment
This treats the required level as a floor rather than a stopping point. Nothing prohibits going deeper, and the equipment rule is about removing the charge, not about how deep the machine ends up.
Memory Technique
Refrigerant in the machine, recovery unit. Refrigerant in the cylinder, vacuum pump.
Reference Hint
A vacuum pump may never be used to remove a refrigerant charge, but it is the normal tool for dehydrating an appliance once the charge has been recovered.
More epa-608-type-3 Questions
Some jobs on a chiller count as a major repair under the refrigerant rules, which changes what a technician is allowed to do with a badly leaking machine. Which job falls into that category?
An owner asks how many pounds of refrigerant the rules allow to be left inside a chiller once the recovery has been signed off. What is the correct answer to give him?
The motor of a hermetic centrifugal chiller sits inside the pressure boundary rather than outside it on a shaft. What follows from that construction?
An oxygen monitor is used to decide whether a chiller machine room is safe to enter after a refrigerant release. Below what oxygen reading is the atmosphere treated as oxygen deficient?
A low-pressure chiller's rupture disc has a discharge line running from it. Where does that line have to terminate?
A refrigerant vapor detector in a chiller machine room reaches its alarm level. Besides sounding, what is that alarm expected to do?
Which piece of equipment requires a technician to hold Type III certification before it may be serviced?
What property of the refrigerant is what actually places an appliance into the low-pressure category?
During normal operation, what condition exists inside the evaporator of a running low-pressure centrifugal chiller?
In what unit is the required final recovery vacuum for a low-pressure appliance normally expressed?
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