Rather than meeting the percentage recovery requirement on a small appliance, a technician is allowed to evacuate the unit to what vacuum level?
Correct Answer
B) 4 inches of mercury vacuum
The small appliance rule gives technicians two ways to comply. One is meeting the applicable recovery percentage. The other is evacuating the appliance to 4 inches of mercury vacuum, which is accepted as an equivalent result and is far easier to verify in the field than weighing a recovered charge. Deeper vacuum levels stated in inches of mercury belong to the evacuation table for larger high-pressure equipment, not to small appliances.
Why This Is the Correct Answer
EPA wrote the small appliance requirement with an either-or structure so a technician does not have to weigh the original charge to prove compliance. Pulling the sealed system down to 4 inches of mercury vacuum satisfies the rule on its own, whatever the compressor condition and whatever the age of the recovery machine.
Why the Other Options Are Wrong
Option A: 10 inches of mercury vacuum
Ten inches of mercury is not a value used in the small appliance requirement. It reads as plausible only because it sits between the real figure and the deeper vacuums used on larger equipment.
Option C: 15 inches of mercury vacuum
Fifteen inches of mercury belongs to the evacuation levels required before opening certain larger high-pressure appliances, not to the small appliance alternative.
Option D: 25 inches of mercury vacuum
Deep vacuums in this range appear in the evacuation requirements for high-pressure equipment above specified charge sizes. Applying that figure to a factory-sealed refrigerator is a category mix-up.
Memory Technique
Four letters in Type I's world: small appliance, small vacuum, 4 inches of mercury.
Reference Hint
40 CFR 82.156: small appliances may be evacuated to 4 inches of mercury vacuum in place of the percentage requirement.
More epa-608-type-1 Questions
An under-counter ice maker is one factory-sealed cabinet, while a modular ice machine head is joined to a remote condenser by field-run tubing. What certification does servicing the modular machine's circuit require?
A technician recovers refrigerant from a small appliance using a recovery machine that was manufactured in 1991. What recovery level must that older equipment achieve?
Two technicians recover from identical refrigerators with working compressors, one using a 1991 recovery machine and the other a 2015 machine. Why do their required recovery levels differ?
System-dependent recovery equipment may be used only on appliances that normally hold up to what amount of refrigerant?
What feature defines a self-contained recovery unit and sets it apart from the system-dependent kind?
When system-dependent recovery equipment is used on a small appliance whose compressor still runs, how can that working compressor be put to use?
Recovery from a small appliance has slowed down and the pressure is barely moving. What accepted technique helps drive the remaining refrigerant out?
After the recovery unit stops pulling on a small appliance, how does a technician confirm that the recovery is actually complete?
A sealed small appliance offers no service port at all. What has to happen before recovery equipment can be connected to it?
As refrigerant from a string of small appliances collects in a recovery cylinder, what fill limit applies to that cylinder?
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