A shop acquires a used recovery machine with no documentation. What should be confirmed before it is put to work on small appliances?
- AThat the machine's hoses are shorter than six feet in order to limit trapped refrigerant in the machine
Hose length is not regulated anywhere. Refrigerant trapped in hoses is dealt with by low-loss fittings and by clearing the machine between jobs, not by a limit on hose length.
- The machine's date of manufacture and whether that model was certified by an EPA-approved laboratory
- CThat the previous owner's certification records were transferred along with the machine at the sale
Technician certification belongs to individuals and does not attach to equipment. Nothing about the previous owner's credentials moves with a machine when it changes hands.
- DThat the machine has never been used with a refrigerant other than the one now planned for that job
Prior refrigerant history matters only in that the machine should be cleared before the next job. It has no bearing on whether the machine is legal to operate on small appliances.
Why B is correct
The date plate and the model's certification status are what determine whether the machine is usable and which recovery level applies. Equipment made on or after November 15, 1993 must be a laboratory-certified model, while older equipment is grandfathered at the lower percentage, so the shop needs to know which it bought.
What this question is testing
This item tests application of the equipment certification and manufacture date rules to a realistic acquisition scenario. It checks that you know what facts about a machine actually matter for compliance. It rewards candidates who can name the two facts that actually govern a machine's use, and who ignore details that sound technical but carry no regulatory weight.
On the job
Auction and secondhand recovery machines are common in small shops, and plenty of them are perfectly good. The problem is that a machine with no manual and a scuffed plate leaves the shop guessing about its obligations. A call to the manufacturer with the model and serial number usually settles both the build date and the certification status in a few minutes. Until that is known, the safe operating assumption is the more demanding standard, and a full service with fresh oil and a new drier is a good idea besides.
Memory technique
Ask a used machine two questions: when were you born, and who signed off on you.
Exam tip
The two things worth knowing about any recovery machine are how old it is and whether the model was lab certified. Everything else on the exam about equipment flows from those.
Where to look it up
40 CFR 82.158 recovery equipment certification by an EPA-approved laboratory for equipment manufactured on or after November 15, 1993.