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?
Correct Answer
C) The manufacturer's published data for that model and serial number
The rules are written around the charge an appliance normally holds, which is a fixed property of that model and its installed configuration. When the plate is unreadable the manufacturer's data for the model, adjusted for line set length where the manufacturer specifies that, is the reference. Guesses drawn from top-off amounts or rules of thumb produce a figure that cannot be defended and that may put the appliance on the wrong side of a threshold.
Why This Is the Correct Answer
The manufacturer publishes the factory charge for each model, and service literature gives the adjustment for line set length where one applies. That is the figure the rules mean by normal charge. It can be documented, it does not change from visit to visit, and it is what an inspector or an owner's records would be compared against.
Why the Other Options Are Wrong
Option A: The weight of refrigerant that the last service visit added to the unit
A top-off amount measures how much leaked out, not how much the unit holds. Using it would understate the charge on any appliance that was still partly full.
Option B: An estimate based on the unit's tonnage using a rule of thumb per ton
Rules of thumb per ton vary widely between equipment types and refrigerants. A figure that decides which side of a threshold an appliance falls on needs a real source.
Option D: The capacity of the recovery cylinder the technician plans to fill
Cylinder capacity is a job planning number chosen by the technician. It has no connection to what the appliance was designed to hold.
Memory Technique
The plate faded, the factory did not. Model and serial numbers still lead to the real number.
Reference Hint
The appliance's full or normal charge comes from the nameplate, or from the manufacturer's data for that model when the plate is unreadable.
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 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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