A technician passed Core and Type II but has not taken Type I or Type III. Which unit on the day's work list may that technician open and service without another certified tech present?
Correct Answer
C) A 5-ton residential split-system heat pump charged with R-410A
A residential split-system heat pump is a high-pressure appliance, which is exactly what the Type II certification covers. The centrifugal machine running R-123 is a low-pressure appliance and belongs to Type III. Both the household refrigerator and the window unit are small appliances: factory-sealed, charged at the factory with 5 pounds or less, so they fall under Type I. The certifications are separate credentials, not a ladder. Holding Type II does not roll up small appliances or low-pressure machines, and only Universal certification covers all three classes at once.
Why This Is the Correct Answer
Type II covers appliances that use high-pressure refrigerant, and a residential split-system heat pump running R-410A is the textbook example. Field-assembled split systems and heat pumps are not factory-sealed small appliances and they do not operate in a vacuum, so Type II is the matching credential.
Why the Other Options Are Wrong
Option A: A 200-ton centrifugal chiller charged with R-123
A centrifugal machine charged with R-123 operates below atmospheric pressure on the low side, which makes it a low-pressure appliance. Servicing it requires Type III certification, not Type II.
Option B: A household refrigerator holding 4 lbs of R-134a in a factory-sealed circuit
A household refrigerator is factory sealed and charged at the factory with 5 pounds or less, which puts it in the small appliance class covered by Type I certification.
Option D: A window air conditioner sealed at the factory with 2 lbs of R-410A
A window air conditioner is also a factory-sealed small appliance holding under 5 pounds, so Type I is the certification that applies to it.
Memory Technique
Count the pressure, not the tonnage: one equals small and sealed, two equals high pressure, three equals a machine that runs in a vacuum.
Reference Hint
40 CFR 82.161 sets four certification types: Type I small appliances, Type II high-pressure, Type III low-pressure, Universal for all three.
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