A helper is sent to add refrigerant to an R-123 centrifugal chiller that is running low, and nothing else is to be touched. What certification does that task require?
Correct Answer
A) Type III certification, because adding refrigerant to a low-pressure appliance is regulated service
Charging is service on the appliance and it can release refrigerant, which puts it squarely inside the technician certification requirement. The appliance is a low-pressure machine, so the certification needed is the one that covers low-pressure appliances. Nothing about the job being simple, or about the circuit not being cut open, changes that. The person doing it also has to be certified in order to have bought the refrigerant in the first place.
Why This Is the Correct Answer
Technician certification is required for maintenance, service and repair that could reasonably be expected to release refrigerant, and connecting and disconnecting charging hoses on a chiller certainly can. The appliance class decides which certification applies, and a machine charged with R-123 is a low-pressure appliance, so Type III is the one that fits.
Why the Other Options Are Wrong
Option B: No certification, because the refrigerant circuit is never opened when a machine is charged
Opening the circuit is not the test. Any service that could release refrigerant requires certification, and charging is service.
Option C: Type II certification, because the charging cylinder is a high-pressure vessel while it is in use
The certification follows the appliance being worked on, not the container the refrigerant arrives in.
Option D: Type I certification, because the work involves a hose connection rather than a machine repair
Type I covers small factory sealed appliances holding five pounds or less, which a centrifugal chiller is not.
Memory Technique
If a hose touches the machine, a card belongs in the pocket.
Reference Hint
Technician certification is required for service that could release refrigerant, and the appliance class determines which type is needed.
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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