A rooftop unit has two completely separate refrigerant circuits, each holding one hundred twenty pounds of R-22, and only one circuit has to be opened. How is the evacuation requirement determined for the circuit being serviced?
Correct Answer
C) By that circuit's own normal charge, which places it under two hundred pounds
Each independent refrigerant circuit is treated as its own appliance for evacuation purposes, because each one contains and uses refrigerant on its own. A circuit holding one hundred twenty pounds of R-22 sits under the two hundred pound split and takes the atmospheric-pressure entry. Adding the two circuits together to reach two hundred forty pounds would push the job onto the deeper row for no reason, since the circuit being opened never sees the other circuit's charge.
Why This Is the Correct Answer
The two circuits do not connect, so refrigerant in one cannot reach the other. The circuit that is being opened is judged by what it normally holds, which is one hundred twenty pounds of R-22, placing it below the two hundred pound split and on the atmospheric-pressure entry. The untouched circuit keeps its charge and is not evacuated at all.
Why the Other Options Are Wrong
Option A: By combining both circuits, since they share one cabinet and one nameplate
Sharing a cabinet does not connect two refrigerant circuits. The nameplate lists both charges precisely because they are separate systems.
Option B: By the total refrigerant the building holds across all rooftop equipment
Charges are never totalled across separate pieces of equipment. Each appliance and each independent circuit stands on its own.
Option D: By the larger of the two circuits, since the deeper level always governs
There is no rule that the deeper of two levels governs. The circuit being opened is placed on the table by its own normal charge.
Memory Technique
Follow the pipe. If refrigerant cannot get there, that charge is not part of your number.
Reference Hint
Each independent refrigerant circuit is placed on the evacuation table by its own normal charge.
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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