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?
Correct Answer
B) Nothing to recover, because no refrigerant is present in the sections being joined
The requirement is to remove refrigerant from an appliance before it is opened. Here the factory charge is shut behind the outdoor unit's closed service valves and never reaches the tubing being brazed, and the indoor coil holds only nitrogen. There is no refrigerant in the sections being joined, so there is nothing to recover. Once the joints are made the system is pressure tested, evacuated, and then the service valves are opened to release the charge.
Why This Is the Correct Answer
Nothing being cut or heated contains refrigerant. The factory charge is isolated behind closed service valves in the outdoor unit, and the indoor coil and line set hold nitrogen. The recovery obligation attaches to refrigerant that is present where the appliance is being opened, so a new installation of this kind has nothing to recover before brazing.
Why the Other Options Are Wrong
Option A: Recovery of the outdoor unit's factory charge before any joint is made
The factory charge stays sealed behind closed service valves during installation. It is not in the tubing being brazed and does not have to be removed.
Option C: Recovery of the nitrogen holding charge into a certified recovery cylinder
Nitrogen is not a refrigerant and is not subject to the recovery rules. A holding charge of nitrogen alone may be released.
Option D: Recovery is required only if the outdoor unit holds more than five pounds
Charge size does not create a recovery obligation where no refrigerant is present in the section being opened. The five pound figure belongs to a different rule.
Memory Technique
No refrigerant in the pipe, no recovery in the plan. But check those valves twice.
Reference Hint
Refrigerant must be removed from an appliance before it is opened; a section that holds only nitrogen has nothing to recover.
More epa-608-type-2 Questions
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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?
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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