A technician has just taken a water-contaminated charge out of a chiller with a split tube, and the next job that day is a clean machine across town. What has to be done to the recovery unit first?
Correct Answer
B) Its filters and its oil have to be changed so that the next machine is not contaminated
A recovery unit that has pulled a wet charge holds moisture and acid in its filter, in its internal lines and in its compressor oil. Connecting it to a clean machine carries that contamination straight into the next chiller, and the owner of the second machine has no way of knowing. Changing the filter core and the oil, and pulling the unit itself into a vacuum before it goes back on a hose, is what keeps one bad job from becoming two.
Why This Is the Correct Answer
Recovery equipment carries whatever it has just pumped. Moisture and acid soak into the compressor oil and load the filter, and both will be pushed into the next appliance the unit is connected to. Changing the oil and filter and evacuating the machine between jobs is the standard practice that keeps contamination from moving between customers.
Why the Other Options Are Wrong
Option A: Its high pressure switch has to be reset so that the next machine can be pulled down deeper
Resetting a pressure switch has nothing to do with contamination, and a recovery unit's protective switches are not what limits how deep it can pull.
Option C: Its nameplate has to be relabeled so that the next machine's paperwork shows the refrigerant
The nameplate identifies the equipment, not its last load. Paperwork does nothing about the moisture and acid actually sitting inside the machine.
Option D: Its cylinder fittings have to be swapped so that the next machine gets a clean hose set
New hoses are worth having, but the contamination that matters is inside the recovery unit's own filter, lines and oil, and swapping fittings does not touch it.
Memory Technique
The recovery machine remembers its last job. Change its oil and filter before it tells the next customer about it.
Reference Hint
Recovery equipment must be maintained so it does not carry contamination from one appliance into the next.
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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A chiller has a leaking evaporator tube and the waterboxes have been removed so the tube sheet is exposed. How does the technician identify the individual tube that is leaking?
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The motor of a hermetic centrifugal chiller sits inside the pressure boundary rather than outside it on a shaft. What follows from that construction?