Type III certification exists as a class of its own, separate from the equipment that Type II covers. What is it about a low-pressure appliance that puts it in that separate class?
Correct Answer
D) Its refrigerant boils above normal room temperature, so much of the machine sits in a vacuum while it runs
A low-pressure appliance uses a refrigerant that will not boil until it is warmer than a typical room, which means the evaporator side sits below atmospheric pressure during operation. That single fact drives everything different about the class: leaks pull air and moisture in rather than pushing refrigerant out, purge units are needed to remove what gets in, and recovery has to deal with a machine that never builds much pressure to push with. Compressor design, charge size and how the machine was assembled are not part of the definition.
Why This Is the Correct Answer
The definition is written around the refrigerant's boiling point at atmospheric pressure. A refrigerant boiling above room temperature leaves the low side under a vacuum during operation, which changes leak behavior, recovery technique and required equipment enough that the rule gives it its own technician certification.
Why the Other Options Are Wrong
Option A: Its refrigerant charge is always larger than the charge carried by a high-pressure machine of the same tonnage
Charge size appears in no appliance definition. A supermarket rack running high-pressure refrigerant routinely holds more refrigerant than a low-pressure chiller of similar capacity.
Option B: It uses a centrifugal compressor instead of the reciprocating or scroll compressors Type II covers
Compressor style is not part of the class. Centrifugal machines are built for both low-pressure and high-pressure refrigerants, and the certification follows the refrigerant, not the compressor.
Option C: It is assembled in the field instead of arriving as a finished factory package like a rooftop
Almost all commercial refrigeration is field assembled to some degree, including the rooftops and racks Type II covers, so assembly method draws no line between the two classes.
Memory Technique
Low pressure lives in a vacuum, so it sucks air in. High pressure pushes refrigerant out.
Reference Hint
40 CFR 82.152: low-pressure appliance uses a refrigerant with a boiling point above room temperature at atmospheric pressure; Type III covers them under 40 CFR 82.161.
More epa-608-type-2 Questions
A walk-in cooler condensing unit holds a full charge of twenty-five pounds of R-404A, which is below the fifty pound threshold that brings an appliance under the leak repair provisions. What still applies to this unit?
An office building has thirty water source heat pumps on a common water loop, and each one left the factory assembled, hermetically sealed and charged with four pounds of R-410A. How is one of those units classified?
A data sheet for an unfamiliar refrigerant lists a boiling point of about fifty-five degrees Fahrenheit at atmospheric pressure. What does that tell a technician holding Core and Type II certification?
A technician holds Core, Type I and Type III certification and is sent to recover the charge from a twenty ton rooftop unit charged with R-410A. What does that combination of sections allow on this job?
A fleet garage technician holds only the vehicle air conditioning certification issued under Section 609 and is asked to recover the charge from the shop's own rooftop air conditioner. What does that credential allow?
A split system's outdoor unit, indoor coil and the line set the installer ran and brazed between them are being considered. For the purposes of the refrigerant rules, what makes up the appliance here?
On a new installation the line set is brazed to a factory charged outdoor unit and an indoor coil shipped under a nitrogen holding charge, with the outdoor unit's service valves still closed. What does the recovery requirement call for before that brazing?
A rooftop unit's data plate has weathered until the charge figure cannot be read, and the technician needs the full charge to place the appliance under the evacuation and leak provisions. Where should that figure come from?
A computer room air conditioning unit holds forty pounds of R-407C and connects to a remote air cooled condenser through refrigerant piping run and brazed by the installer. How is that unit classified?
A shop's office manager, who holds no technician certification, is sent to a supply house to pick up a new recovery machine for the commercial crew. What does the sales restriction require at that counter?
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A commercial ice machine uses a remote air-cooled condenser connected by a line set that was brazed during installation, and the completed circuit holds about nine pounds of refrigerant. Which certification covers service on that circuit?
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A technician certified in Core and Type II arrives to find that the failed machine is a centrifugal chiller charged with R-123, a refrigerant that boils above normal room temperature. What may that technician do on the machine?