An older chiller is charged with R-114, a refrigerant that boils just below forty degrees Fahrenheit at atmospheric pressure. Which class does the regulation place that appliance in?
Correct Answer
C) A high-pressure appliance, since the refrigerant boils below the dividing line
The word chiller does not decide anything. Classification comes from where the refrigerant boils at atmospheric pressure, and R-114 boils below the fifty degree line that separates the high-pressure and low-pressure classes. It is one of the refrigerants the regulation names directly when it describes the high-pressure class. A technician holding Core and Type II is the one certified for this machine, not a Type III technician.
Why This Is the Correct Answer
R-114 boils below the dividing line of ten degrees Celsius, about fifty degrees Fahrenheit, at atmospheric pressure, which places its appliances in the high-pressure class. The regulation lists it among the examples of high-pressure refrigerants. Chillers appear in both the high-pressure and low-pressure classes, and the refrigerant rather than the machine style is what settles which one applies.
Why the Other Options Are Wrong
Option A: A low-pressure appliance, since chillers of this vintage normally are
Plenty of chillers are high-pressure machines. The word describes what the equipment does for the building, not the pressure class of its refrigerant.
Option B: A very high-pressure appliance, because of the compressor type used
Very high-pressure describes refrigerants boiling far below zero. Compressor type never enters the classification, which is written entirely around the refrigerant.
Option D: An unclassified appliance, since the refrigerant is no longer manufactured
A refrigerant going out of production changes nothing about how its appliances are classified or which requirements apply to servicing them.
Memory Technique
A chiller can be either. Put a gauge on it cold: pressure means high-pressure, vacuum means low-pressure.
Reference Hint
R-114 boils below the ten degree Celsius line and its appliances are high-pressure appliances covered by Type II.
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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