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?
Correct Answer
B) The appliance is low-pressure and Type III certification is needed
Appliance classes are defined by where the refrigerant boils at atmospheric pressure. Above about fifty degrees Fahrenheit the refrigerant is a low-pressure refrigerant, and a machine using it will sit in a vacuum on its low side during normal operation. A boiling point of fifty-five degrees is on that side of the line, so this is Type III equipment and a technician holding only Core and Type II is not certified for it.
Why This Is the Correct Answer
The dividing line between the high-pressure and low-pressure classes is a boiling point of ten degrees Celsius, which is fifty degrees Fahrenheit, measured at atmospheric pressure. A refrigerant that boils at fifty-five degrees is above that line, so the appliance is a low-pressure appliance and it takes Type III certification. Core and Type II do not reach it.
Why the Other Options Are Wrong
Option A: The appliance is high-pressure and the technician's card covers it
High-pressure refrigerants boil below the fifty degree line. A refrigerant that stays liquid at ordinary room temperature is not one of them.
Option C: The appliance is very high-pressure and needs no additional section
Very high-pressure describes refrigerants that boil far below zero. A refrigerant boiling above room temperature is at the opposite end of the scale.
Option D: The boiling point says nothing, so the operating pressures decide the class
The class is defined by boiling point at atmospheric pressure, and operating pressures follow from it. The data sheet has already answered the question.
Memory Technique
Room temperature is the fence post. A refrigerant that would sit still in an open cup belongs to the chiller people.
Reference Hint
High-pressure and low-pressure appliances are divided by a refrigerant boiling point of ten degrees Celsius, about fifty degrees Fahrenheit, at atmospheric pressure.
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 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?
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?
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