A technician keeps the recovery cylinder on a scale throughout a recovery job instead of judging the fill level by lifting the cylinder. What is that scale there to prevent?
Correct Answer
C) Filling the cylinder past eighty percent of its rated capacity, which leaves no room for the liquid to expand
A recovery cylinder must never be filled beyond eighty percent of its rated capacity. Liquid refrigerant expands as it warms, and a cylinder filled liquid-full has nowhere for that expansion to go, so warming it in a truck or in the sun can build enough hydrostatic pressure to rupture it. Weight is the only reliable way to know where you are, because a cylinder that feels heavy tells you nothing precise. The scale gets zeroed against the stamped tare weight and watched all the way through the job.
Why This Is the Correct Answer
The eighty percent limit exists to leave vapor space above the liquid. Refrigerant liquid expands substantially with temperature, and without that space the expansion has nothing to compress, so pressure climbs far past anything the relief device was sized for. A scale is the only accurate way to track fill in the field.
Why the Other Options Are Wrong
Option A: Recovering refrigerant that has already picked up compressor oil, since the scale weighs the oil along with the charge
Oil carryover is handled by the machine's separator and by the reclaimer, and a little oil in the cylinder is normal. A scale weighs everything inside without distinguishing oil from refrigerant, so it cannot police this.
Option B: Losing track of how long the recovery machine has been running against its duty cycle limit
Run time is not a safety limit and says nothing about how much refrigerant has gone into the cylinder. Recovery rate varies with temperature and charge, so a clock is no substitute for a weight reading.
Option D: Mixing two different refrigerants together in one cylinder, which makes the contents unreclaimable
Keeping refrigerants apart is a labeling and cylinder-management practice, and it matters, but the scale plays no part in it. A weight reading cannot tell one refrigerant from another.
Memory Technique
Eighty percent full, twenty percent room to grow. Liquid needs somewhere to go when it warms up.
Reference Hint
Recovery cylinders must be DOT approved and filled no more than 80 percent of rated capacity by weight.
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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