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?
Correct Answer
A) A high-pressure appliance, which places the work under Type II
R-407C boils well below room temperature, so it is a high-pressure refrigerant and the unit is a high-pressure appliance. The field brazed piping to the remote condenser also rules out any small appliance treatment, since the circuit was completed on site rather than sealed at the factory. Servicing it calls for Core and Type II certification and for recovery equipment certified for appliances other than small appliances.
Why This Is the Correct Answer
The refrigerant sets the class, and R-407C sits in the high-pressure family along with R-22 and R-410A. Forty pounds and a field brazed connection to a remote condenser put the unit well outside the small appliance description. It is a high-pressure appliance, so Type II certification covers the work and the high-pressure rows of the evacuation table apply to it.
Why the Other Options Are Wrong
Option B: A small appliance, because the indoor section arrived factory charged
The small appliance description requires the whole unit to have been charged and hermetically sealed at the factory. A field piped remote condenser breaks that on its own.
Option C: A low-pressure appliance, because it runs continuously at part load
Low-pressure describes a refrigerant that boils above room temperature and a machine that runs in a vacuum. Duty cycle has nothing to do with the classification.
Option D: A very high-pressure appliance, because of its year round operation
Very high-pressure refers to refrigerants boiling far below the ordinary range. Continuous operation is a load characteristic, not a pressure class.
Memory Technique
Remote condenser means somebody brazed it on site. Site brazing means Type II.
Reference Hint
R-407C is a high-pressure refrigerant; a field piped unit of any charge size is not a small appliance.
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 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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