After the required recovery level is reached, how does a technician confirm the reading is genuine rather than a temporary pump down?
Correct Answer
D) Close the recovery valves, isolate the machine, and confirm the pressure does not climb
While the recovery machine runs, it can hold the appliance at a low reading that the machine itself would not maintain. Closing the valves and letting the machine sit shows the truth. If the pressure holds, the refrigerant is genuinely out. If it climbs, something is still giving up refrigerant, usually the oil, or air is leaking in. Either way the job is not finished, and opening the machine at that point would release refrigerant into the room.
Why This Is the Correct Answer
Isolating the appliance removes the recovery machine's influence and lets the vessel show its own condition. A stable reading means the refrigerant is truly gone. A rising reading means refrigerant is still coming out of the oil or air is entering, and both call for more work before the machine is opened.
Why the Other Options Are Wrong
Option A: Restart the recovery machine for another ten minutes and read the gauge again to be sure
Running the machine longer only produces the same pump-influenced reading a second time. It cannot tell a genuinely empty machine from one whose pressure will rebound once everything is isolated.
Option B: Open the machine to the room and check for refrigerant odor in the room
Opening the machine to check by smell releases whatever refrigerant is left, which is the outcome the procedure exists to prevent. Smell is not a measurement in any case.
Option C: Weigh the recovery cylinder and compare the total to the nameplate charge on the plate
Recovered weight is useful for records but rarely matches the nameplate closely enough to prove a machine is empty, since oil holds refrigerant and past service changed the charge.
Memory Technique
Valve it off and walk away. A vacuum that holds is real; a vacuum that climbs is borrowed.
Reference Hint
Recovery is verified by isolating the appliance and confirming the pressure holds rather than rebounding.
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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