Which piece of equipment requires a technician to hold Type III certification before it may be serviced?
Correct Answer
A) A centrifugal chiller charged with R-123
Type III certification covers low-pressure appliances, and the classic example is a centrifugal chiller running R-11, R-113, or R-123. These machines operate partly in a vacuum, so they are serviced very differently from ordinary air conditioning. A rooftop unit with R-410A is a high-pressure appliance and falls under Type II. A factory-sealed window unit with a small charge is Type I work. An ultra-low-temperature freezer with R-13 is a very high-pressure appliance, which is also handled under Type II. Universal certification would cover all of them.
Why This Is the Correct Answer
R-123 is a low-pressure refrigerant used almost exclusively in centrifugal chillers, and any appliance charged with it is a low-pressure appliance. Servicing, recovering from, or disposing of that machine is Type III work. A technician needs either Type III or Universal certification to open the machine or connect recovery equipment to it.
Why the Other Options Are Wrong
Option B: A packaged rooftop unit charged with R-410A
R-410A operates at high pressure, well above atmospheric on both sides of the system. Rooftop packaged units are high-pressure appliances and are covered by Type II certification, not Type III.
Option C: A factory-sealed window air conditioner holding three pounds of refrigerant
A factory-sealed window unit holding a small charge is a small appliance. Small appliances holding five pounds or less and charged at the factory are Type I work, regardless of which refrigerant they contain.
Option D: An ultra-low-temperature laboratory freezer charged with R-13
R-13 is a very high-pressure refrigerant used in cascade and ultra-low-temperature systems. Very high-pressure appliances are grouped with high-pressure work under Type II certification, so this is not a Type III machine.
Memory Technique
Three ones, three number classics: R-11, R-113, R-123 all start with 11 or 12 and all mean Type III.
Reference Hint
Certification categories are set out in 40 CFR 82.161; Type III is the low-pressure appliance category.
More epa-608-type-3 Questions
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?
What should a technician do about the water in the chiller tubes before pulling a deep vacuum on the machine?
What happens if the internal pressure of a low-pressure chiller is driven past the rating of its rupture disc?
Which refrigerant was the original factory charge in most low-pressure centrifugal chillers built during the nineteen sixties and seventies?
A running low-pressure chiller develops an opening in a section of shell that is below atmospheric pressure. What passes through that opening?
A technician is assigned to recover the charge from a large water chiller holding nine hundred pounds of R-134a. Which certification does that job require?
Into which appliance category does a machine charged with R-13 for very low temperature service fall?
On a low-pressure centrifugal chiller running at load, how do the evaporator and condenser sit relative to atmospheric pressure?
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