Free EPA 608 Universal Exam Flashcards

All four levels must be passed under secure, proctored, closed-book conditions through an EPA-approved certifying organization. A Core result earned through an open-book test cannot be applied toward Universal certification.

Certification is required when covered work involves attaching or removing hoses and gauges, adding or removing refrigerant, or otherwise opening the refrigerant circuit. An apprentice is exempt only while closely and continually supervised by a properly certified technician.

CFCs generally have the highest ODP, HCFCs have lower but nonzero ODP, and HFCs have zero ODP because they contain no chlorine or bromine. Zero ODP does not mean zero climate impact; many HFCs have high global-warming potential.

Ultraviolet radiation breaks stable chlorine-containing compounds in the stratosphere and releases chlorine atoms. A chlorine atom can catalytically destroy ozone and be regenerated to repeat the reaction many times.

No. U.S. production and import of HCFC-22 for ordinary servicing ended in 2020, but existing equipment may still be serviced with legally available previously produced, recovered, or reclaimed R-22, subject to the applicable rules.

EPA permits de minimis emissions during a good-faith recovery effort, releases during normal equipment operation, and substitutes it specifically exempts. Otherwise, intentional venting of ODS or non-exempt substitutes during service or disposal is prohibited.

Recovering removes refrigerant and stores it without necessarily processing it. Recycling cleans it for reuse through basic processes such as oil separation and filtering. Reclaiming processes it to the applicable purity specification and requires an EPA-certified reclaimer.

If the recovered refrigerant changes ownership, it must be reclaimed by an EPA-certified reclaimer before resale or reuse. It may be returned without reclamation to the same system or to another system owned by the same person.

Generally, a Section 608 certified technician or an employer that documents employment of an appropriately certified technician. Section 609 certification alone does not permit purchasing refrigerant intended for stationary equipment.

System-dependent equipment relies on the appliance's compressor or internal pressure to move refrigerant. Self-contained equipment has its own compressor or pump and can remove refrigerant without relying on the appliance to supply the motive force.

A substitute may require different lubricants, seals, controls, pressure ratings, or approved use conditions. Blends can also fractionate when components leak at different rates, so compatibility and the approved retrofit procedure must be verified first.

Use a DOT-approved reusable recovery cylinder and a scale to keep its fill within 80% of rated capacity. Never refill a disposable cylinder; once empty, handle it according to its disposal instructions.

Use dry nitrogen with a pressure regulator and relief valve. Oxygen or compressed air can form a combustible or explosive mixture with refrigerant and oil; nitrogen must still remain within the appliance manufacturer's pressure limit.

It is fully manufactured, charged, and hermetically sealed in a factory with five pounds or less of refrigerant. Examples include household refrigerators, window air conditioners, dehumidifiers, water coolers, and vending machines.

Recover 90% of the refrigerant. As an alternative to the percentage standard, the technician may evacuate the appliance to four inches of mercury vacuum.

Recover 80% when the appliance compressor is not functional or when the recovery or recycling equipment was manufactured before November 15, 1993. Evacuation to four inches of mercury vacuum is an alternative.

The appliance must provide the motive force through a working compressor, system pressure, or controlled heating. The receiving container does not supply its own recovery compressor, so the technique must match the appliance's condition.

Run the compressor to move refrigerant toward the recovery connection, following the appliance and recovery-device instructions. Turning off a functional compressor too early leaves more refrigerant trapped in the system.

Install access on both the high and low sides so trapped refrigerant has an escape path. Controlled warming and gently tapping the compressor can help release refrigerant from the oil; never use an open flame.

Let the cylinder stabilize, measure its temperature, and compare the pressure with the correct refrigerant's saturation value. A materially high pressure can indicate noncondensable gas; an inconsistent relationship can also suggest a mixed or misidentified refrigerant.

It can become a leak path if left permanently installed. Remove it after service and seal the access point using an approved permanent method appropriate for the appliance.

The final disposer is responsible. If another entity performed the recovery, the disposer may rely on a signed statement naming and addressing the recoverer and stating the date of recovery; EPA does not require a disposal sticker.

No. EPA exempts that specific disposal-stream recovery activity from technician certification. The exception does not cover maintaining, servicing, or repairing the appliance, which still requires the appropriate certification.

High heat can decompose refrigerant into toxic and corrosive products. Recover the refrigerant first and use approved, controlled heating methods only when the procedure calls for them.

R-134a is an HFC with zero ozone-depletion potential, but it is not freely ventable. Stationary R-134a equipment remains subject to technician-certification, recovery, sales, and non-exempt substitute-refrigerant rules.

Type II covers servicing or disposing of high- and very-high-pressure appliances, except small appliances and motor vehicle air conditioners. Common stationary examples include many comfort-cooling systems and commercial refrigeration systems.

Oil traces near joints or components can mark a refrigerant leak, while low charge may cause excessive evaporator superheat. Confirm with an appropriate leak-detection method rather than charging solely from a symptom.

Use dry nitrogen, regulated below the equipment's maximum test pressure. A trace of the system refrigerant may support electronic detection when allowed, but pure refrigerant is not the preferred pressurizing gas and oxygen or compressed air is unsafe.

Do not use it on an appliance with more than 15 pounds of refrigerant. Use self-contained recovery equipment capable of meeting the required evacuation level.

Moving liquid first removes much of the refrigerant mass quickly and shortens total recovery time. Vapor must still be recovered afterward until the required evacuation level is reached.

Use short, large-diameter hoses, remove restrictive valve cores when permitted, keep the recovery cylinder cooler than the appliance, and recover liquid before vapor. Never heat a cylinder beyond its safe temperature or overfill it.

Evacuate a high-pressure appliance with a full charge below 200 pounds to 0 inches Hg vacuum. At 200 pounds or more, evacuate it to 10 inches Hg vacuum.

A high-pressure appliance with at least 200 pounds must reach 4 inches Hg vacuum. A very-high-pressure appliance is recovered to 0 inches Hg vacuum regardless of whether the equipment is pre- or post-1993.

It includes removing the compressor, condenser, evaporator, or auxiliary heat-exchange coil, or opening more than four square inches of flow area for over 15 minutes. Major repairs require the applicable full evacuation procedure rather than the limited non-major exception.

Isolate leaking from non-leaking components where possible, evacuate non-leaking sections to the required level, and evacuate the leaking section to the lowest attainable level that avoids substantial contamination, never above 0 psig.

Over a 12-month period, the triggers are 30% for industrial process refrigeration, 20% for commercial refrigeration, and 10% for comfort cooling and all other covered appliances.

Generally, the owner or operator must repair the leak within 30 days or develop a retrofit-or-retirement plan within 30 days and complete it within one year. Repairs require initial and follow-up verification tests; special timing rules and extensions can apply.

Under the AIM Act, many appliances with at least 15 pounds of an HFC or certain substitutes with GWP above 53 became subject to 10%, 20%, or 30% leak-rate triggers. Residential and light-commercial air-conditioning and heat-pump equipment is excluded from this provision.

Much of the system operates below atmospheric pressure, so leaks tend to draw air and moisture inward rather than push refrigerant outward. Noncondensables raise pressure and reduce efficiency.

Excessive purge-unit operation. A purge removes noncondensable gases that entered the system, so unusually frequent purging points to an air leak that should be located and repaired.

First use controlled hot water or the chiller's built-in heating or pressurization device. If that is insufficient, use regulated nitrogen while remaining within the appliance's safe test-pressure limit.

Do not exceed 10 psig. Low-pressure chillers are not built for high positive pressure, and their rupture disc is commonly designed to open at 15 psig, leaving a necessary safety margin.

Evacuate it to 25 mm Hg absolute. This is an absolute-pressure measurement, not 25 inches Hg vacuum; confusing the units produces a very different endpoint.

As refrigerant pressure drops, its saturation temperature drops. Water left motionless in evaporator tubes can freeze, expand, and rupture tubes, allowing water to contaminate the refrigerant side.

A pressure rebound can show that liquid refrigerant remains in the chiller or dissolved in its oil. Resume recovery rather than treating the first vacuum reading as proof that recovery is complete.

Heat the oil to 130°F before removal to drive out dissolved refrigerant and minimize emissions. Follow the equipment procedure and recover the released refrigerant rather than venting it.

Vapor raises system pressure and saturation temperature gradually. Introducing liquid into a deep vacuum can flash refrigerant violently and freeze water in the tubes; after the initial vapor charge, add liquid through the evaporator charging valve as directed.

The purge unit removes the accumulated gases. A properly operating high-efficiency purge limits the refrigerant carried out with them; frequent purge operation can also be evidence of an air leak.

Pressurize it to 0 psig before opening it. Use controlled hot water or the built-in heating or pressurization device; methods that require later purging, such as nitrogen, generally cannot be used for this exception except with R-113 equipment.

It calls for an oxygen-deprivation sensor for machinery rooms using any refrigerant and a refrigerant sensor for R-123. These controls warn of an unsafe release before technicians enter or remain in the space.