A leak on the liquid line of a 60-ton R-410A rooftop unit has been brazed shut. What does the technician still owe on that repair before the unit is considered properly returned to service?
Correct Answer
A) An initial verification test on the repaired joint while the system is pressurized, plus a follow-up check once the unit is back at normal operating conditions
A repair is not finished when the torch goes cold. The joint has to be verified under pressure before the system goes back into service, and then checked again once the unit is running at normal operating temperatures and pressures, because thermal cycling and real running pressures reveal joints that looked fine on a static test. Handing verification to the building owner is not acceptable, and dye is a detection aid rather than proof of repair. Sending the recovered charge out for purity analysis is unrelated to whether the brazed joint holds.
Why This Is the Correct Answer
Verification comes in two stages: a test on the repaired joint while the system is pressurized, and a follow-up once the appliance has returned to normal operating characteristics. Running pressures and temperatures stress the joint in ways a static pressure test does not, so both checks matter.
Why the Other Options Are Wrong
Option B: A follow-up check only, performed after the unit is back at normal operating conditions, because putting test pressure on a freshly brazed joint can crack the repair
Skipping the pressurized test runs the sequence backwards. A properly brazed joint tolerates the initial verification pressure, and finding a bad repair then, before the charge goes back in, is what saves the refrigerant.
Option C: A dye charge left in the system so the building owner can watch the joint over the season instead of a technician retesting it
Verification is the technician's obligation, not the customer's. Dye helps locate a leak later on, but a stain that appears months from now is not proof that today's repair held under pressure.
Option D: A purity analysis of the recovered charge, performed by a certified reclaimer before any of it goes back into the repaired system
Purity of the recovered charge and integrity of the brazed joint are separate questions. A reclaimer's analysis says nothing about whether the repaired joint will hold once the unit runs at operating pressure.
Memory Technique
Test it cold, then test it hot. A joint that passes at rest can still open up at running pressure.
Reference Hint
40 CFR 82.157 leak repair verification: initial verification test on the repair plus follow-up verification once the appliance is back at normal operating characteristics.
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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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?