A refrigerator is reported to have leaked out its entire charge. What do the rules require before a technician cuts the tubing open?
- ANothing further, because refrigerant that has already leaked out cannot be recovered later
A leak history says nothing about what is still inside. Refrigerant held in the oil and low-pressure vapor left in the box is recoverable and still counts toward the requirement.
- Connect recovery equipment and remove whatever refrigerant remains, verifying the level with a gauge
- CRecord the customer's account of the leak and treat the loss as a de minimis emission instead
The de minimis allowance covers small quantities released despite a good faith recovery effort. It does not turn a prior leak into permission to skip recovering whatever charge remains.
- DPressurize the system with nitrogen so that any remaining refrigerant is pushed out through the leak path
Pushing residual refrigerant out through a leak with nitrogen is a deliberate release. Nitrogen is for pressure testing after the charge is recovered, not for clearing a system that still holds one.
Why B is correct
The obligation is to recover whatever refrigerant is actually in the appliance and to verify the result, not to accept a report that the unit is empty. Refrigerant dissolved in the compressor oil comes out as the system warms and the machine pulls, so hooking up and confirming with a gauge is the only defensible approach.
What this question is testing
This item tests whether you apply the recovery requirement based on verified system condition rather than on customer reports. It also probes the limits of the de minimis allowance and the proper role of nitrogen. Answering correctly means treating a customer's report as unverified information and knowing that residual refrigerant in the oil is both real and recoverable.
On the job
Technicians hear the words already empty on a large share of no-cooling calls, and it is right often enough to be tempting. Hooking up anyway costs a few minutes and regularly turns up a partial charge, especially on units that have been sitting cold. It also protects the technician: if a gauge reading and a stable vacuum are on the ticket, there is a record that recovery was performed. Cutting a line on somebody's word leaves nothing to stand on.
Memory technique
Empty is a measurement, not a story. Put a gauge on it.
Exam tip
Never take empty on faith. The exam rewards connecting the recovery equipment and verifying with a gauge every time.
Where to look it up
40 CFR 82.154 venting prohibition and 82.156(a) recovery levels apply to whatever refrigerant remains in the appliance.