Small-appliance recovery for EPA 608 Type I

Answer: B. To vaporize refrigerant that may be trapped in oil or system components

• AEPA sets recovery percentages and vacuum levels, not a temperature the appliance must reach.
• BCorrect: gentle heat raises the pressure and drives out refrigerant dissolved in the oil or trapped in parts, so more of the charge is recovered.
• CMoisture is kept out by keeping the system sealed, not by heating it.
• DHeating has nothing to do with cutout switches; a pressure cutout should never be defeated.

Heating the appliance gently increases the internal pressure and vaporizes refrigerant that may be dissolved in oil or trapped in components. This helps achieve a more complete recovery by ensuring more refrigerant enters the vapor state and can be removed.

Answer: A. The high side of the system

• ACorrect: a running compressor pushes the refrigerant to the high side (condenser), so that is where it is collected.
• BWith the compressor running, the low side is being pumped down, so recovering from it alone misses most of the charge.
• CAccess on both sides is the procedure when the compressor does not run; with a working compressor the high side is enough.
• DCondenser outlet and evaporator inlet are not standard access points; this mixes up the high-side rule with specific fittings.

When using the appliance's own operating compressor for recovery, refrigerant is actively pumped to the high side. Recovering from the high side efficiently captures the charge.

Answer: A. Install access valves on both the high and low sides

• ACorrect: with no running compressor and a restricted capillary tube, refrigerant is trapped on both sides, so access valves go on both the high and low sides.
• BA single process-tube connection reaches only one side, leaving refrigerant trapped behind the restriction.
• CHigh-side-only access is for a running compressor that moves the charge there; here the compressor is dead.
• DLow-side-only access leaves the refrigerant on the high side of the restriction unrecovered.

A restricted capillary tube traps refrigerant. With an inoperable compressor, technicians must access both high and low sides to achieve the required 80% recovery endpoint.

Answer: D. To minimize refrigerant loss when accessing the sealed system

• AFittings do not change how efficiently the system runs.
• BFittings provide access; they do not add refrigerant by themselves.
• CA fitting allows a gauge connection, but its purpose here is to open the sealed system without losing refrigerant.
• DCorrect: solderless (piercing or quick-connect) fittings let you tap into a sealed system without brazing, so little refrigerant escapes.

Solderless fittings (such as piercing valves and quick-connect fittings) are used to avoid high-temperature brazing that could release refrigerant to the atmosphere during service of small appliances. They provide a temporary access point that can be sealed when service is complete.

Answer: B. They can leak if left on the system permanently

• APiercing valves can be used on systems of any age; 1993 relates to recovery equipment, not access fittings.
• BCorrect: piercing valves are temporary and tend to leak over time, so they should not be left on the system after service.
• CNo EPA permit is needed to install an access fitting.
• DPiercing valves are mechanical clamps, not instruments, and need no calibration.

Piercing valves are temporary access fittings that can leak over time if left attached. They should be removed after service is complete, and any refrigerant lines that were pierced should be permanently sealed to prevent future leaks.

Answer: C. Properly seal any holes created by the valve

• AUsing a piercing valve does not trigger any EPA report.
• BRecharging is a separate service step and is not done when the unit is being scrapped; the access point must be sealed either way.
• CCorrect: the pierced spot is a potential leak, so the valve should be removed and the opening permanently sealed when service is finished.
• DRust inhibitor does not seal a refrigerant line.

After using a piercing valve, technicians must ensure any holes created are properly sealed to prevent future leaks. Piercing valves are temporary access points and can cause leaks if left in place or if the pierced area isn't properly sealed.

Answer: C. Access the process tube

• ARemoving the compressor would release the charge and is not a way to access the system.
• BDrilling into the condenser releases refrigerant uncontrolled and damages the coil.
• CCorrect: the process tube left from factory charging is the usual access point, fitted with a piercing or access valve.
• DCutting the liquid line releases the charge, which is prohibited venting.

Process tubes are often the only access point on small appliances without service ports. These tubes were used during manufacturing to charge the system and can be used for refrigerant recovery when properly accessed.

Answer: A. Using tap access fittings

• ACorrect: tap (piercing) access fittings open the sealed system in a controlled way, without heat or an uncontrolled release.
• BTorch heat on a charged line raises pressure and can rupture it or decompose the refrigerant, and some substitutes are flammable.
• CVenting any non-exempt refrigerant, including HFC substitutes, is prohibited.
• DCutting a charged line releases refrigerant and is prohibited venting.

Applying heat or cutting pressurized lines causes severe thermal and overpressure hazards. Safe access requires using proper tap access fittings to control pressure safely.

Answer: B. Close all valves and cap service lines to prevent leakage

• AVenting the remaining charge is prohibited.
• BCorrect: close all valves and cap the lines so nothing leaks out while recovery is paused.
• CLeaving hoses connected with open valves invites leaks through hoses and connections overnight.
• DAdding nitrogen would contaminate the remaining refrigerant and is not part of recovery.

If recovery must stop, close all valves and cap the service lines so no refrigerant escapes, which the venting prohibition forbids, until recovery resumes.

Answer: C. By comparing the weight of refrigerant recovered to the appliance's charge specification

• ATime depends on the equipment and conditions, not on how much refrigerant was actually removed.
• BThe sound of the equipment tells nothing reliable about how much refrigerant was recovered.
• CCorrect: weigh what went into the recovery cylinder and compare it with the nameplate charge.
• DThe final vacuum alone does not show how much of the charge was captured; refrigerant can still be dissolved in the oil.

Recovery efficiency is determined by comparing the amount of refrigerant recovered to the amount that was in the system. This can be calculated by weighing the recovery cylinder before and after recovery and comparing to the appliance's nameplate charge.

Answer: B. Compressor oil

• ACondenser fins are outside the refrigerant circuit.
• BCorrect: refrigerant dissolves in the compressor oil and keeps boiling out after recovery seems done, which is why pressure can rise afterward.
• CTubing holds only vapor that recovery has already removed; it does not trap refrigerant the way oil does.
• DA fan motor is outside the refrigerant circuit.

The compressor oil often retains dissolved refrigerant that slowly outgasses as pressure is reduced. This is why systems may show a pressure increase after initial recovery, requiring additional recovery steps to achieve complete evacuation.

Answer: D. To increase the recovery rate by lowering cylinder pressure

• ACooling the cylinder is meant to help vapor condense, not to stop refrigerant from changing state.
• BOil separation is not done by cooling the recovery cylinder.
• CDOT rules cover labels, cylinder type and fill limits, not cooling during recovery.
• DCorrect: a cooler cylinder has lower pressure, so the pressure difference grows and refrigerant flows in faster.

Cooling a recovery cylinder lowers the pressure inside it, which increases the pressure differential between the small appliance and the cylinder. This speeds up the recovery process by allowing refrigerant to flow more easily into the cooler cylinder.

Answer: D. The recovery rate decreases

• AThe rate does not increase; the pressure difference that drives the flow is shrinking.
• BThe rate is not constant; it depends on the pressure difference, which falls during recovery.
• CThe change is predictable, not random: lower system pressure means slower recovery.
• DCorrect: as system pressure drops, the push into the recovery cylinder weakens, so recovery slows near the end.

As system pressure decreases during recovery, the recovery rate slows down because there is less pressure difference between the appliance and recovery cylinder. This makes the final stages of recovery take longer than the initial stages.

Answer: B. Do not start the recovery process.

• APulling a vacuum is not recovery; a 0 psig reading first raises the question of where the refrigerant went.
• BCorrect: 0 psig means there is no refrigerant pressure left to recover (it has leaked out), so recovery should not begin; there is nothing to recover and the system may be open to air.
• CAir is never used for leak testing; use dry nitrogen.
• DAdding refrigerant just to recover it again wastes refrigerant and skips finding the leak.

If the gauge reads 0 psig after the access valve goes on, the charge has already leaked out and there is nothing to recover. Find out why, usually a leak, before deciding on repair or disposal.

Answer: C. It must be certified to meet EPA's requirements

• ANo 1995 cutoff exists; the date that matters for recovery equipment is November 15, 1993.
• BRecovery can be self-contained or system-dependent; the rule does not ban non-electric methods.
• CCorrect: recovery equipment must be certified by an EPA-approved testing organization as meeting EPA's requirements.
• DRecovery equipment can serve several refrigerants if it is certified for them and cleaned between uses.

Recovery equipment used on small appliances must be certified to meet EPA's requirements for efficiency and performance. This certification ensures the equipment can achieve the required evacuation levels and recovery rates.

Answer: B. It must be tested by an EPA-approved lab and certified for the specific refrigerant.

• ANo rule requires one machine to handle every blend on the market.
• BCorrect: self-contained recovery equipment must be certified by an EPA-approved testing organization for the refrigerant it will recover.
• CThe 5 lb limit defines a small appliance; it does not restrict where certified recovery machines may be used.
• DAn oil separator is not an EPA requirement for recovery equipment.

Self-contained recovery equipment used to recover refrigerant must be tested by an EPA-approved laboratory and certified for the specific type of refrigerant being recovered.