An older centrifugal chiller is converted from R-11 to R-123. What happens to the certification a technician needs to service it afterward?
Correct Answer
C) It stays Type III because both refrigerants are in the low-pressure class
Both R-11 and R-123 boil above ordinary room temperature at atmospheric pressure, so both put the machine into a vacuum and both make it a low-pressure appliance. Converting between them changes the refrigerant's chemistry and its ozone depletion potential but not its pressure behavior, so the appliance category and the required certification stay the same. Type III still applies before and after the retrofit, and the same recovery, purge and freeze precautions carry over unchanged.
Why This Is the Correct Answer
Appliance class depends on the pressure the refrigerant develops, and R-123 behaves like R-11 in that respect. That is precisely why R-123 was chosen as the replacement: it lets the same machine run with modest changes. Since the pressure behavior is unchanged, the machine remains a low-pressure appliance and Type III certification still governs the work.
Why the Other Options Are Wrong
Option A: It changes to Type II because R-123 is an HCFC rather than a CFC
Whether a refrigerant is a CFC or an HCFC has no bearing on appliance class. Class is set by pressure behavior, and R-123 stays in the low-pressure range.
Option B: It changes to Universal because a retrofitted machine no longer fits one category
Retrofitting does not create a special category or force a technician to hold every type. The machine simply remains a low-pressure appliance.
Option D: It drops to Type I because R-123 has a much lower ozone depletion potential
Type I is defined by a factory sealed charge of five pounds or less. Ozone depletion potential plays no part in setting the certification type.
Memory Technique
Swap eleven for one twenty three, the vacuum stays the same. Same class, same card.
Reference Hint
R-11 and R-123 are both low-pressure refrigerants, so a conversion between them leaves the appliance in the Type III category.
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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