The compressor in a small appliance will not turn at all, and the technician pulls the unit down to four inches of mercury vacuum using a 2018 recovery machine. How does that result stand against the requirement?
- AIt fails, because a seized compressor forces the eighty percent route to be used instead
A seized compressor does point a technician toward eighty percent if the percentage route is chosen, but it does not close off the vacuum route, which remains available on any small appliance.
- It satisfies the requirement, because the vacuum route stands on its own whatever the compressor is doing
- CIt fails, because the vacuum route opens up only when the appliance compressor is running
This reverses the rule. The vacuum reading is a property of the appliance under the machine's pull, and a dead compressor is precisely the situation in which technicians reach for it most often.
- DIt counts, but only once the same unit is also weighed against its listed factory charge
The two routes are alternatives, not a pair that must both be shown. Weighing the recovery on top of a satisfied vacuum reading is extra work that proves nothing further.
Why B is correct
Reaching four inches of mercury vacuum at the appliance is a complete way of satisfying the small appliance recovery requirement on its own. The compressor condition test belongs to the percentage branches, where it decides between ninety and eighty percent. Once a technician takes the vacuum route, that test no longer has anything to act on, so a seized compressor changes the difficulty of the job but not the standard.
What this question is testing
This item tests whether you treat the vacuum alternative as an independent route or mistakenly attach conditions to it that belong to the percentage branches. It also checks that you can tell the difference between a fact that makes a job harder and a fact that changes the legal requirement.
On the job
A seized compressor is the everyday case at a recycling yard or on a no cool call that turns out to be a dead unit. The vacuum route is what keeps those jobs moving, because there is no charge to look up and no percentage to argue about. The practical work is on the access side: with no compressor to help, refrigerant has to be drawn from where it sits, so the high side gets a tap as well as the low side. Once the gauge sits in the vacuum band and stays there, the job is done.
Memory technique
Percentages ask how the compressor is doing. The vacuum does not care.
Exam tip
The compressor condition only ever chooses between ninety and eighty percent. If a stem says the technician pulled a vacuum, the compressor question is already off the table.
Where to look it up
Small appliance recovery is met by the percentage route or by four inches of mercury vacuum. The vacuum route carries no compressor condition.