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Recovery Requirements & Techniques — EPA 608 Practice Questions

55 questions · 42% of the Type I — Small Appliances exam

Worked questions

1. 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.

2. Many hermetic compressors in small appliances carry a short sealed stub of tubing at the shell. What service purpose does that process tube serve?

  • AIt vents excess pressure to the outside automatically if the compressor overheats during operation

    The stub is a plain sealed piece of tubing with no relief mechanism inside it. Compressor protection on these units is a thermal overload on the electrical side, not a pressure vent.

  • BIt holds a factory sample of oil that a technician can draw off for laboratory analysis

    There is no oil sample reservoir on a hermetic compressor, and oil analysis is not a routine service on small appliances. The stub was an assembly line access point, not a sampling port.

  • It provides a place to attach a service adapter for recovery and recharging, then be pinched and brazed shut
  • DIt equalizes pressure between the high and low sides each time the unit cycles off so the compressor can restart

    Pressure equalizes through the capillary tube during the off cycle on these systems. The process tube is pinched and brazed shut and plays no part in normal operation at all.

Why C is correct

The process tube is a service stub left over from factory charging. A process tube adapter clamps over it and seals, giving a clean connection for recovery, evacuation, and recharging. Afterward the stub is pinched closed and brazed, which returns the circuit to the sealed condition it was built in.

What this question is testing

This item tests recognition of the standard factory access point on hermetic compressors and the full sequence of using it, including restoring the seal afterward. It checks practical familiarity with Type I service hardware. It rewards candidates who have handled the hardware, since the stub, the adapter, and the pinch-off tool only make sense together as one procedure.

On the job

Using the process tube is generally cleaner than clamping a piercing valve onto a random run of tubing, since the stub was designed to be worked on and pinches and brazes closed neatly. It also puts the connection at the compressor, where warming the shell during a slow recovery does the most good. Technicians who look for the stub first tend to leave a tidier repair, with one factory-intended access point rather than a saddle valve clamped somewhere on the line.

Memory technique

Process tube equals the factory's straw. Sip through it, then pinch and braze it closed.

Exam tip

The process tube is the factory's door. Any question about closing it ends the same way: pinch it off and braze it shut.

Where to look it up

EPA Section 608 small appliance service practice; the sealed circuit must be closed again after service per the hermetic construction described in 40 CFR 82.152.

3. A helper assumes the four inches of mercury vacuum that satisfies small appliance recovery is the same depth of vacuum used to dry a system out before recharging. How do those two levels compare?

  • AThe recovery level is deeper by roughly half, which is why a two stage pump is called for

    Nothing about the recovery level requires a two stage pump, and recovery is not performed with a vacuum pump at all because a pump discharges to the room.

  • The recovery level is far shallower, standing only about two pounds below atmospheric pressure
  • CThe two levels match, since each one is read on the same compound gauge in inches of mercury

    The two readings are not the same depth, and a dehydration target is far too deep to resolve on a compound gauge at all, which is why a separate micron gauge exists.

  • DThe recovery level is far deeper, reaching well below one hundred microns of absolute pressure

    This reverses the relationship. A hundred microns is a deep dehydration vacuum, roughly a ten thousandth of the pressure the recovery requirement asks for.

Why B is correct

Four inches of mercury vacuum is measured downward from atmospheric pressure, and each inch is worth roughly half a pound per square inch. The appliance therefore sits about two pounds below room pressure, which a compound gauge shows as a needle barely into the vacuum side. Dehydration targets are hundreds of times deeper and are read on a micron gauge, not on a compound gauge.

What this question is testing

This item tests whether you can place the small appliance recovery level on a real pressure scale instead of treating it as an unattached number. It also checks that you keep the recovery step and the dehydration step separate, since they use different tools and are performed at different points in the job.

On the job

A technician who thinks four inches of mercury is a deep vacuum will keep a small appliance on the machine long past the point the rule was satisfied, and may conclude a good recovery machine is failing. The opposite mistake is worse: someone who thinks the recovery level equals a dehydration vacuum may reach for a vacuum pump, which exhausts refrigerant straight into the shop. On the bench the sequence is simply recovery machine to reach the required level, then vacuum pump after the repair to dry and de-air the system before the weighed charge goes in.

Memory technique

Four inches is a fingertip below the line. Microns are the bottom of the well.

Exam tip

Recovery pulls a shallow vacuum to prove the refrigerant is out. Dehydration pulls a deep vacuum to prove the water is out. Different targets, different gauges, different tools.

Where to look it up

Four inches of mercury vacuum is about two psi below atmospheric pressure, roughly one fifteenth of a full vacuum.

4. A window unit's data plate lists a ten ounce charge, the compressor ran throughout the job, the recovery machine was built in 2015, and nine ounces now sit in the recovery cylinder. What does that result mean?

  • The ninety percent requirement is satisfied, so the sealed circuit may now be opened
  • BOnly eighty percent applies with a running compressor, so an extra ounce came out needlessly

    Eighty percent is the figure for a newer machine working on an appliance whose compressor will not run. Swapping the two conditions is the single most common mistake on this rule.

  • CThe result falls short, because a running compressor raises the target to the entire charge

    No branch of the small appliance rule asks for the entire charge. The requirement tops out at ninety percent precisely because the compressor oil holds some refrigerant back.

  • DThe reading cannot count, because recovered weight is never used to judge the requirement

    Weighing what comes out against the factory charge is exactly how the percentage routes are demonstrated. The alternative to weighing is the vacuum reading, not a ban on the scale.

Why A is correct

Two facts set the level here: the recovery machine was built after November 15, 1993, and the appliance compressor ran. That pair puts the job in the ninety percent branch. Nine ounces recovered against a ten ounce factory charge lands exactly on that figure, so the requirement is satisfied and there is no reason to keep the machine running before opening the system.

What this question is testing

This item tests whether you can apply both halves of the newer equipment rule to a concrete job and then judge a result against the figure you selected. It also checks that you do not confuse the ninety percent and eighty percent conditions, which is where most candidates lose this point.

On the job

Techs who use the percentage route keep a small platform scale in the van and set the recovery cylinder on it before the first hose goes on. Tare the cylinder, run the job, read the gain. On a ten ounce window unit the whole recovery is a matter of ounces, so the scale has to be one that resolves them; a bathroom scale will not. Most technicians skip the arithmetic altogether by taking the vacuum route, but on a job where the cylinder is already on the scale for other reasons, reading the gain is the faster proof.

Memory technique

Running compressor, higher bar. The unit that helps you is the unit that is held to more.

Exam tip

Read the equipment date first, then the compressor condition, then do the arithmetic. Two of the wrong choices here are built from swapping those two conditions.

Where to look it up

Newer recovery equipment: ninety percent with the compressor running, eighty percent with it not running.

5. 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.

6. The last person in the disposal chain accepts household refrigerators along with signed statements that the refrigerant has already been recovered from them. How long do those statements have to be kept?

  • Three years from the date the facility received each signed statement
  • BNinety days, long enough to cover the current calendar quarter's loads

    Ninety days is a reporting interval used in other environmental programs. Nothing in the small appliance disposal rules ties record retention to a calendar quarter.

  • COne year, matching the interval between the site's own equipment checks

    One year is a plausible sounding figure but it is not the retention period here, and equipment inspection intervals have no bearing on how long records are kept.

  • DUntil the appliances leave the yard, after which the file may be cleared

    Records exist to be looked at after the fact. Clearing the file when the appliances are processed would leave nothing to inspect, which is the opposite of what verification is for.

Why A is correct

The verification statements a final processor collects are records under the Section 608 program, and program records are kept for three years. Holding them for that period means the facility can show an inspector, long after the appliances themselves have been shredded, that each load arrived with an assurance the refrigerant had already been recovered by someone qualified to do it.

What this question is testing

This item tests the recordkeeping half of the disposal chain rather than the recovery half. It checks that you know verification generates a record with a defined life, and that you can hold the three year figure apart from other retention periods that appear in environmental rules.

On the job

Scrap yards and appliance recyclers keep a binder or a scanned folder of signed statements, one per load, naming who recovered the refrigerant and when. When an inspector visits, that binder is the first thing asked for, and it is compared against the volume of appliances the site has processed. A yard that shreds the paperwork with the appliances has no way to answer, even if every load actually was clean. Contractors who haul appliances get asked for these statements constantly, so having a standard form in the truck saves an argument at the gate.

Memory technique

Three letters in EPA, three years in the file.

Exam tip

Three years is the retention period for Section 608 records generally. If a question asks how long any 608 paperwork is kept, three years is the default worth remembering.

Where to look it up

Section 608 records, including disposal verification statements, are kept for three years.

7. The repair on a household refrigerator is finished, the system has been evacuated, and the technician is ready to put refrigerant back in. How is the correct amount determined on a capillary tube small appliance?

  • ABy running the unit and adding vapor until suction pressure matches a chart for the refrigerant

    Suction pressure on a capillary tube system moves with box temperature and load, so matching a chart figure says nothing definite about how many ounces are inside.

  • BBy adding refrigerant until frost reaches the end of the evaporator with the door closed

    Frost patterns shift with door openings, ambient temperature and how long the unit has run. Chasing frost routinely overcharges a small system by a large fraction.

  • CBy filling until the sight glass at the drier clears of bubbles at normal room temperature

    Small appliances almost never have a sight glass, and on a capillary tube system a clear glass would say nothing about whether the weighed charge is right.

  • By weighing in the exact amount the data plate lists, using an accurate charging scale

Why D is correct

Small appliances meter refrigerant through a capillary tube and hold no reserve charge, so the correct amount is a specific weight rather than a pressure to chase. That weight is on the data plate. Charging by scale reproduces the factory figure exactly, which is why every manufacturer's service literature for a sealed system gives a charge in ounces or grams rather than an operating pressure.

What this question is testing

This item tests service practice on the recharge step that follows recovery and repair. It checks that you recognise a capillary tube system as critically charged, that you know where the correct amount comes from, and that you can rule out indirect indicators that work only on larger systems.

On the job

The charging scale is the most used tool on a sealed system repair after the recovery machine. Cabinets in the field carry charges as small as four to six ounces, so the scale has to resolve tenths of an ounce and sit on a level surface out of the draft. Techs weigh the charging cylinder before and after, or set the scale to count down. Overcharging a refrigerator by an ounce shows up as a warm box with a flooded evaporator and a compressor running cool; undercharging shows up as a partially frosted coil and long run times. Neither is fixed by guessing.

Memory technique

Capillary tube means no reserve. No reserve means no guessing. Weigh it.

Exam tip

Anything described as factory sealed with a capillary tube is charged by weight. If a choice involves reading a pressure or watching frost, it belongs to a larger system with an adjustable metering device.

Where to look it up

Small appliances are critically charged. Weigh in the exact data plate charge with a scale.

8. Nine ounces came out of a refrigerator whose data plate calls for a ten ounce charge, and the technician plans to put that same recovered refrigerant back in after the repair. What does the recharge require?

  • AReturning the nine ounces and running the unit, since it came out of this same cabinet

    A refrigerant's origin does not make an incomplete charge correct. Nine ounces in a ten ounce system runs warm with long cycles no matter where those nine ounces came from.

  • BReturning the nine ounces and adding vapor until the suction pressure looks correct

    Suction pressure on a capillary tube system tracks load and ambient rather than charge, so it is far too coarse to land on the last ounce.

  • CReturning the nine ounces and topping up until frost covers the whole evaporator

    Frost patterns shift with door openings and room temperature, and chasing frost on a small system routinely produces an overcharge.

  • Returning the nine ounces plus enough more to reach the full ten ounce data plate charge

Why D is correct

The recovery requirement and the charging requirement are two different numbers doing two different jobs. Recovery is satisfied at a percentage of the charge or at a vacuum reading; charging is satisfied only at the exact weight the data plate specifies. Since recovery always leaves a portion behind in the oil, the recovered refrigerant has to be supplemented from a clean cylinder of the same refrigerant until the scale reads the full charge.

What this question is testing

This item tests whether you can carry the reason behind the percentage recovery requirement forward into the recharge step. It checks that you do not confuse the amount recovered with the amount the appliance needs, and that you know the data plate weight governs the charge.

On the job

This is where the physics from the recovery side shows up as money and callbacks. Techs who assume the cylinder holds the whole charge send units back out an ounce light, and the customer calls back a week later about a warm crisper drawer. The van needs a small cylinder of clean refrigerant of each type in common use, alongside the recovery cylinders, precisely so the shortfall can be made up. Keep the recovered material and the clean material clearly separated, because a mixed cylinder is worth nothing to anybody.

Memory technique

What comes out is a percentage. What goes back in is the whole number.

Exam tip

Recovery is a percentage, charging is a weight. Whenever a stem gives you both an amount recovered and a data plate figure, the gap is the point of the question.

Where to look it up

Recovery leaves refrigerant behind in the oil, so the recharge is topped up to the full data plate weight with a scale.

47 more in the bank

Answers and explanations for these are in the app.

  • Using recovery equipment manufactured after November 15, 1993 on a small appliance whose compressor still operates, how much of the refrigerant charge must be removed?
  • When the compressor in a small appliance will not run, what portion of the refrigerant must the technician recover?
  • Rather than meeting the percentage recovery requirement on a small appliance, a technician is allowed to evacuate the unit to what vacuum level?
  • When system-dependent recovery equipment is used on a small appliance whose compressor does not operate, how must the sealed system be tapped?
  • What characteristic identifies a recovery unit as system-dependent rather than self-contained equipment?
  • 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?
  • A technician recovers R-134a into a cylinder that still holds recovered R-12 from an earlier job. What is the consequence for that refrigerant?
  • Refrigerant recovered from a small appliance is going back into service once the repair is finished. When may it be reused without first being sent to a reclaimer?
  • Why does system-dependent recovery generally take longer to finish than recovery performed with a self-contained machine?
  • Refrigerant recovered out of small appliances has to be stored in what kind of container?
  • Why do many technicians evacuate a small appliance to the allowed vacuum level rather than tracking a recovery percentage?
  • Why should the hoses used for recovering refrigerant from small appliances be fitted with low-loss or self-sealing fittings?
  • The nameplate on a small appliance is unreadable and the refrigerant type is unknown. What should the technician do before starting recovery?
  • Why can a small appliance not be brought down to the required level using an ordinary vacuum pump that exhausts into the shop?
  • Using self-contained recovery equipment on a small appliance whose compressor is seized, why is it still worth opening both the high side and the low side?
  • Section 608 sets the small appliance recovery target as a percentage of the charge instead of every last ounce in the system. What physical reason makes that final fraction impractical to pull out?
  • A household refrigerator's compressor still runs, and the only recovery machine on the truck was built in 1992. How does that working compressor affect the recovery level this job has to reach?
  • A small appliance comes in with its data plate worn away, so the factory charge cannot be read anywhere on the cabinet. Which route to meeting the small appliance recovery requirement still works here?
  • A technician needs to clamp a bolt-on piercing valve onto a household refrigerator so that recovery equipment can be connected to the sealed circuit. Which location gives that valve a chance to seal?
  • At the end of a properly performed small appliance recovery, a small puff of vapor escapes as the low loss fitting is pulled off the access valve. How do the rules treat that particular release?
  • A household refrigerator's sealed circuit has been opened to change out a failed compressor, and the technician is laying out parts for the rebuild. What should happen to the filter drier that is already in the system?
  • A new compressor is being brazed into a household refrigerator after the charge was recovered. Why do technicians run a slow trickle of dry nitrogen through the tubing while the joints are being heated?
  • A system-dependent recovery unit is being used on a small appliance, and the transfer has nearly stopped because the pressures on the two sides have evened out. Which accepted step restores the difference that drives refrigerant across?
  • A technician reaches a scrap yard and finds that a worker has already cut through the tubing on a row of household refrigerators with a saw. What is the situation regarding the refrigerant and the duty to recover it?
  • A property manager asks whether the leak repair and follow up requirements that apply to the building's large chiller also reach the twelve ounce household refrigerators in the apartments. What is the answer?
  • A window air conditioner has a factory Schrader access port on its suction line, and recovery through that port is running very slowly even though the machine is working correctly. Which technique opens up the flow?
  • The required recovery level has been reached on a household refrigerator and the technician is ready to open the sealed circuit so the compressor can come out. What should the tubing be opened with?
  • Recovery has brought a small appliance down to four inches of mercury vacuum, and the technician is about to cut the lines and braze in a new compressor. What should be done about the system pressure first?
  • A vending machine's factory sealed refrigeration deck is slid out of the cabinet in one piece with its circuit never opened, and that old deck is now going to a scrap hauler. What does Section 608 require?
  • A superintendent pulls twenty window air conditioners out of the walls every October, stores them in a basement, and reinstalls the same units the following May. What do the recovery rules require at the time the units are removed?
  • The charge has been recovered from a small appliance to the required level, and the technician then pressurizes the system with dry nitrogen to hunt for the leak. When that test is finished, what may be done with the nitrogen?
  • A technician reaches for a halide torch to hunt a leak on a refrigerator whose data plate lists R-134a as the charge. Why will that particular tool fail to find the leak?
  • Halfway through recovering a row of chest freezers at a recycling yard, the scale shows that the recovery cylinder has reached the weight corresponding to its fill limit. What is the correct next step?
  • A helper points at the compound gauge reading zero pounds on a small appliance and says the system must be empty, so the tubing can be cut open now. What is wrong with that reasoning?
  • A packaged terminal unit charged with R-410A needs its charge recovered, and the only machine in the shop carries a label listing older refrigerants and a much lower working pressure. How should the technician proceed?
  • Before the first hose goes onto a small appliance, a careful technician evacuates the recovery hoses and the manifold. What problem does that step prevent?
  • A shop's recovery machine carries a certification label naming small appliances as the equipment it was tested against. A twenty pound sealed reach-in cooler now arrives for a compressor change. What does that label mean for this job?
  • During recovery from a household freezer, several ounces of compressor oil collect in the recovery machine's oil separator. What should the technician do about the oil that came out of the appliance?
  • A technician evacuated a small appliance to the required level last week, capped the access valve, and is only returning now to change the compressor. What should be done before the tubing is cut open?

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