EPA Section 608 Universal Technician Certification — Questions and Answers

Question 1: Which entity could legally require an HVAC technician to complete refrigerant continuing education even though EPA does not?

The refrigerant manufacturer
The Department of Transportation
The appliance's original installer
A state or local licensing authority (Correct answer)

Correct answer: A state or local licensing authority

States, localities, and employers may impose CE requirements beyond the federal Section 608 rules.

Question 2: How should challenges in continuing education requirements be addressed?

Apply systematic problem-solving, seek expert guidance when needed, and document decisions (Correct answer)
Ignore challenges until they resolve themselves
Avoid challenges and stick to familiar tasks
Delegate all challenges to supervisors

Correct answer: Apply systematic problem-solving, seek expert guidance when needed, and document decisions

Systematic problem-solving combined with appropriate consultation and documentation ensures challenges are addressed effectively.

Question 3: A halide torch will NOT detect leaks of which refrigerant?

CFC-12
HCFC-22
HFC-134a (Correct answer)
R-502

Correct answer: HFC-134a

Halide torches react to chlorine, and HFC-134a contains no chlorine.

Question 4: What must a company that does refrigerant service do about its recovery equipment?

Register each technician's vehicle with EPA
Certify to EPA that it has acquired certified recovery equipment (Correct answer)
Have its equipment inspected by the state every month
Lease recovery equipment only from EPA

Correct answer: Certify to EPA that it has acquired certified recovery equipment

Establishments that service or dispose of appliances must certify to EPA that they have acquired certified recovery or recycling equipment.

Question 5: During a vacuum decay test, the micron reading keeps climbing steadily and never levels off. What is the most likely cause?

Normal pressure equalization
Oil outgassing
A system leak (Correct answer)
Residual moisture

Correct answer: A system leak

A rise that never stops shows that atmospheric air is leaking into the system.

Question 6: What must be done after repairing a refrigerant leak in a system?

Increase system pressure
Replace the compressor
Add extra refrigerant
Perform a leak verification test (Correct answer)

Correct answer: Perform a leak verification test

After repairing a refrigerant leak, it is crucial to perform a leak verification test to ensure the repair was successful and the system is no longer leaking. This step confirms the integrity of the system and prevents further refrigerant emissions. EPA regulations mandate this verification to ensure compliance and environmental protection.

Question 7: Which statement about EPA-approved continuing education for Section 608 is accurate?

EPA requires CE only after a refrigerant violation
EPA requires CE only for Universal technicians
EPA does not require any CE hours to maintain 608 certification (Correct answer)
EPA requires 4 hours of CE per year

Correct answer: EPA does not require any CE hours to maintain 608 certification

There is no federal CE hour requirement tied to Section 608 certification.

Question 8: What is the EPA's requirement regarding refrigerant leaks in comfort cooling systems?

5% annually
10% annually (Correct answer)
15% annually
20% annually

Correct answer: 10% annually

Under EPA Section 608 regulations, comfort cooling systems, such as most residential and commercial air conditioning units, are subject to a maximum allowable annual refrigerant leak rate of 10% of the system's charge. If a system leaks above this threshold, owners and operators are required to repair the leak within a specified timeframe. This regulation aims to reduce the emission of refrigerants, which are often potent greenhouse gases, into the atmosphere.

Question 9: How are refrigerant blends with a temperature glide best charged into a system?

Mixed with oil before charging
As a vapor through the low side
As a vapor through the high side
As a liquid from the cylinder (Correct answer)

Correct answer: As a liquid from the cylinder

Zeotropic refrigerant blends with temperature glide should be charged as a liquid to maintain the correct mixture ratios and prevent fractionation.

Question 10: During a standing vacuum test, the micron gauge reading rises after the pump is isolated and then levels off. What does this most likely indicate?

The vacuum pump oil is contaminated
Moisture is still present in the system (Correct answer)
The system is fully dehydrated
A leak in the system

Correct answer: Moisture is still present in the system

A rise that levels off means moisture is boiling off until it reaches equilibrium, while a rise that keeps going points to a leak.

Question 11: What quality assurance measure supports assessment and evaluation?

Quality checks are unnecessary for experienced professionals
Quality only matters for new practitioners
Annual review is sufficient
Regular self-assessment, peer review, and adherence to established standards (Correct answer)

Correct answer: Regular self-assessment, peer review, and adherence to established standards

Ongoing quality assurance through self-assessment, peer review, and standards adherence ensures continuous improvement.

Question 12: How should applied methods and techniques knowledge be maintained and updated?

Knowledge updates are only needed every five years
Initial training provides lifelong competence
Learning stops after certification
Through continuous professional development, current literature review, and professional networking (Correct answer)

Correct answer: Through continuous professional development, current literature review, and professional networking

Professional competence requires ongoing development through education, literature review, and engagement with the professional community.

Question 13: After recovering refrigerant from a system with a compressor burnout, what should be done to the recovery unit?

Change its filter-drier and check the oil (Correct answer)
Raise the cut-out pressure
Nothing; the unit is self-cleaning
Vent the unit to remove acid

Correct answer: Change its filter-drier and check the oil

Burnout refrigerant carries acid and contaminants that saturate the recovery unit's filter-drier and can damage the machine.

Question 14: Why is it important to recover refrigerant from leaking systems?

Reduces system efficiency loss
Prevents harmful emissions (Correct answer)
Reduces need for insulation
Speeds up the cooling process

Correct answer: Prevents harmful emissions

Refrigerants, particularly older types like CFCs and HCFCs, are potent ozone-depleting substances, while HFCs are powerful greenhouse gases. Recovering refrigerant from leaking systems prevents these chemicals from escaping into the atmosphere, where they contribute to ozone depletion and climate change. This practice is mandated by EPA regulations to protect the environment.

Question 15: A halide torch would NOT detect a leak in a system charged with which refrigerant?

R-502
R-22
R-12
R-134a (Correct answer)

Correct answer: R-134a

A halide torch reacts to chlorine, and R-134a is an HFC that contains no chlorine.

Question 16: What is the primary environmental benefit of refrigerant recycling and reclamation programs?

They reduce the need to vent or waste refrigerants that harm the ozone layer and contribute to climate change (Correct answer)
They eliminate all greenhouse gas potential from recovered refrigerants
They generate energy that offsets refrigerant manufacturing costs
They convert CFCs into non-ozone-depleting compounds

Correct answer: They reduce the need to vent or waste refrigerants that harm the ozone layer and contribute to climate change

Recycling and reclamation allow ozone-depleting and high-GWP refrigerants to be reused rather than vented or wasted, directly reducing environmental harm.

Question 17: What is the minimum passing score for the Type I exam when taken in the open-book online format?

70% (18 of 25)
84% (21 of 25) (Correct answer)
60% (15 of 25)
90% (23 of 25)

Correct answer: 84% (21 of 25)

The open-book Type I exam requires 21 of 25 correct, higher than the 70% for proctored sections.

Question 18: Which refrigerant class has the highest ozone depletion potential (ODP)?

HFCs (hydrofluorocarbons)
HFOs (hydrofluoroolefins)
CFCs (chlorofluorocarbons) (Correct answer)
HCFCs (hydrochlorofluorocarbons)

Correct answer: CFCs (chlorofluorocarbons)

CFCs have the highest ODP because they contain chlorine atoms that are very effective at destroying stratospheric ozone.

Question 19: What documentation must technicians provide when disposing of appliances containing refrigerants?

Warranty certificate
Proof of refrigerant recovery (Correct answer)
Disposal permit
Safety inspection checklist

Correct answer: Proof of refrigerant recovery

Under EPA Section 608 regulations, technicians and appliance disposers must maintain records demonstrating that refrigerants have been properly recovered from appliances before disposal. This documentation serves as proof of compliance with environmental laws designed to prevent the release of ozone-depleting substances and greenhouse gases into the atmosphere.

Question 20: What should a technician do with the oil removed from a refrigeration system or recovery machine after recovery?

Return it to the customer's trash
Pour it down a floor drain
Burn it on site
Dispose of it according to federal, state, and local regulations (Correct answer)

Correct answer: Dispose of it according to federal, state, and local regulations

Refrigerant oil may contain dissolved refrigerant and contaminants and must be handled under applicable waste regulations.

Question 21: Which property defines a refrigerant's 'temperature glide'?

The superheat required at the compressor inlet
The rate at which refrigerant cools the evaporator coil
The difference between the refrigerant's critical and boiling temperatures
The temperature range over which a zeotropic blend evaporates at constant pressure (Correct answer)

Correct answer: The temperature range over which a zeotropic blend evaporates at constant pressure

Temperature glide is the difference between the dew point and bubble point of a zeotropic refrigerant blend as it changes phase at constant pressure.

Question 22: A recovery cylinder at 75°F reads a pressure noticeably higher than the P-T chart value for the refrigerant it contains. What is the most likely cause?

Noncondensable gases are present (Correct answer)
The refrigerant is too cold
The cylinder is under vacuum
The cylinder is overfilled with oil

Correct answer: Noncondensable gases are present

Noncondensables such as air add their partial pressure, raising cylinder pressure above the refrigerant's saturation pressure.

Question 23: What is the certification requirement for refrigerant recovery/recycling equipment manufactured after November 15, 1993?

Manufacturers must self-certify the equipment annually
Equipment must be certified by an EPA-approved equipment testing organization (Correct answer)
Equipment must be certified every 5 years by ASHRAE
No certification is required; only technician certification matters

Correct answer: Equipment must be certified by an EPA-approved equipment testing organization

Recovery and recycling equipment manufactured after November 15, 1993 must be certified by an EPA-approved equipment testing organization to ensure it meets performance standards.

Question 24: What ethical standard governs continuing education requirements practice?

Ethical standards are optional for certified professionals
Ethics only apply in academic settings
Ethics are personal opinions, not professional requirements
Adherence to the profession's code of ethics and applicable laws and regulations (Correct answer)

Correct answer: Adherence to the profession's code of ethics and applicable laws and regulations

Professional ethics codes and applicable laws provide the framework for ethical practice in every professional field.

Question 25: What does a refrigerant's ASHRAE number prefix of '1' (e.g., R-134a vs. R-1234yf) indicate?

One hydrogen atom in the molecule
First generation of that refrigerant type
One chlorine atom in the molecule
One carbon-carbon double bond (unsaturated) (Correct answer)

Correct answer: One carbon-carbon double bond (unsaturated)

The '1' prefix in ASHRAE refrigerant numbering indicates the molecule contains one carbon-carbon double bond, classifying it as an unsaturated compound (olefin/HFO).

Question 26: What happens to recovered refrigerant that is too contaminated to be reused in the same system?

It must be destroyed immediately on-site
It can be blended with new refrigerant
It must be vented safely outdoors
It must be sent to an EPA-certified reclamation facility (Correct answer)

Correct answer: It must be sent to an EPA-certified reclamation facility

Heavily contaminated refrigerant must be sent to an EPA-certified reclamation facility where it is processed to ARI-700 purity standards before being resold.

Question 27: Recovered refrigerant has not been reclaimed. Where may it be charged?

Only into appliances under 5 lbs
Back into the same appliance or another appliance owned by the same owner (Correct answer)
Nowhere, because it must always be reclaimed
Into any customer's appliance

Correct answer: Back into the same appliance or another appliance owned by the same owner

Recovered or recycled refrigerant can go back into the same system or another system owned by the same owner without being reclaimed.

Question 28: What is the ASHRAE safety classification for R-717 (ammonia)?

A1
A2L
B2L (Correct answer)
B3

Correct answer: B2L

Ammonia (R-717) is classified B2L because it is toxic (B) and mildly flammable (2L), requiring strict safety protocols in industrial refrigeration.

Question 29: Which release of refrigerant is considered a 'de minimis' release and NOT a violation of the venting prohibition?

Purging a system with refrigerant to clear moisture
Small releases that occur during good-faith recovery using proper techniques and equipment (Correct answer)
Venting a full charge because the recovery machine broke
Releasing refrigerant to check for leaks

Correct answer: Small releases that occur during good-faith recovery using proper techniques and equipment

De minimis releases are the small unavoidable amounts released while making good-faith attempts to recover refrigerant properly.

Question 30: A technician wants to speed up vapor recovery into a recovery cylinder. Which technique helps?

Recovering vapor before liquid
Heating the recovery cylinder
Using the smallest hoses available
Cooling the recovery cylinder (Correct answer)

Correct answer: Cooling the recovery cylinder

A cooler cylinder has lower pressure, so the pressure difference that moves refrigerant into it is larger.

Question 31: Which statement about reclaimed refrigerant is TRUE?

It must be destroyed after the reclamation process
It meets AHRI 700 purity standards and can be resold to any buyer (Correct answer)
It cannot be mixed with virgin refrigerant under any circumstances
It can only be used in the system from which it was originally recovered

Correct answer: It meets AHRI 700 purity standards and can be resold to any buyer

Reclaimed refrigerant meeting AHRI 700 purity standards is essentially equivalent to virgin refrigerant and may be resold to any buyer without ownership restrictions.

Question 32: Who is responsible for making sure refrigerant is recovered from a small appliance before it is disposed of?

The final person in the disposal chain, such as the scrap recycler (Correct answer)
Local fire departments
The appliance's first buyer
The original manufacturer

Correct answer: The final person in the disposal chain, such as the scrap recycler

The final person in the disposal chain must make sure refrigerant is recovered, or get a signed statement that it was already recovered.

Question 33: Which group of refrigerants is classified as mildly flammable (A2L) and requires extra handling precautions such as spark-free tools and ignition-source control?

R-11 and R-123
R-502 and R-500
R-12 and R-22
R-32 and R-454B (Correct answer)

Correct answer: R-32 and R-454B

R-32 and R-454B are A2L refrigerants with low toxicity and lower flammability, requiring ignition-source precautions.

Question 34: Why is a large refrigerant leak in an enclosed space dangerous?

Refrigerant vapor is always explosive
Refrigerant vapor is lighter than air and rises
Refrigerant vapor is heavier than air and can displace oxygen, causing asphyxiation (Correct answer)
Refrigerant vapor causes immediate blindness

Correct answer: Refrigerant vapor is heavier than air and can displace oxygen, causing asphyxiation

Refrigerant vapor sinks and pushes oxygen out of low, enclosed areas, which can cause suffocation.

Question 35: A high-pressure appliance with 250 lb of HCFC-22 was made after November 15, 1993. What evacuation level is required before opening it?

25 mm Hg absolute
10 in. Hg vacuum (Correct answer)
0 in. Hg (0 psig)
15 in. Hg vacuum

Correct answer: 10 in. Hg vacuum

HCFC-22 appliances with 200 lb or more must be evacuated to 10 in. Hg with post-1993 equipment.

Question 36: A system is heavily contaminated with moisture. What evacuation technique is recommended?

Charging refrigerant and running the system to dry it
Triple evacuation, breaking the vacuum with dry nitrogen between pulls (Correct answer)
Single evacuation to 29 inches Hg
Purging the system with compressed air

Correct answer: Triple evacuation, breaking the vacuum with dry nitrogen between pulls

Breaking the vacuum with dry nitrogen absorbs and sweeps out moisture, so repeated pulls dry the system more effectively.

Question 37: What documentation is typically required when sending recovered refrigerant to an EPA-registered reclaimer?

A signed EPA waiver authorizing transfer of ozone-depleting substances
A system maintenance record covering the previous five years of service
A manifest identifying the refrigerant type, quantity, and system of origin (Correct answer)
Only the technician's valid EPA 608 certification card

Correct answer: A manifest identifying the refrigerant type, quantity, and system of origin

A manifest or similar documentation identifying the refrigerant type, quantity, and origin system is required to establish chain of custody when sending refrigerant for reclamation.

Question 38: What ethical standard governs communication and documentation practice?

Ethics only apply in academic settings
Ethics are personal opinions, not professional requirements
Adherence to the profession's code of ethics and applicable laws and regulations (Correct answer)
Ethical standards are optional for certified professionals

Correct answer: Adherence to the profession's code of ethics and applicable laws and regulations

Professional ethics codes and applicable laws provide the framework for ethical practice in every professional field.

Question 39: After a leak repair on a regulated appliance, what must be done and recorded?

An EPA site inspection request
A new certification exam for the technician
A soap bubble test only, with no records
An initial verification test and a follow-up verification test (Correct answer)

Correct answer: An initial verification test and a follow-up verification test

Leak repairs require initial and follow-up verification tests, and the owner must keep records of both.

Question 40: Recycled refrigerant that has NOT been reclaimed to AHRI 700 standards may be used in which systems?

The same system or other systems owned by the same person (Correct answer)
Any system in the same building regardless of ownership
Only brand-new systems installed after 1993
Any system containing the same type of refrigerant

Correct answer: The same system or other systems owned by the same person

Recycled refrigerant not meeting AHRI 700 standards may only be returned to the same system or other equipment owned by the same person, due to ownership restrictions.

Question 41: A technician has a Type I certification only. Which equipment may they service and document under that certification?

Small appliances with 5 lb or less of refrigerant (Correct answer)
Low-pressure chillers
High-pressure systems over 50 lb
Motor vehicle air conditioners

Correct answer: Small appliances with 5 lb or less of refrigerant

Type I certification covers manufactured, hermetically sealed small appliances with 5 lb or less of refrigerant.

Question 42: How long must a technician or business keep refrigerant service and leak-repair records under Section 608?

6 months
1 year
10 years
3 years (Correct answer)

Correct answer: 3 years

Most Section 608 recordkeeping rules require keeping records for at least three years.

Question 43: How should industry best practices knowledge be maintained and updated?

Learning stops after certification
Through continuous professional development, current literature review, and professional networking (Correct answer)
Initial training provides lifelong competence
Knowledge updates are only needed every five years

Correct answer: Through continuous professional development, current literature review, and professional networking

Professional competence requires ongoing development through education, literature review, and engagement with the professional community.

Question 44: Which change from the 2016 Section 608 update is something a technician certified before 2016 must learn on their own, since no retesting is required?

Leak repair and recordkeeping rules extended to appliances with HFC substitutes (Correct answer)
Removal of the venting prohibition
Elimination of Type I certification
A new requirement to recertify every 5 years

Correct answer: Leak repair and recordkeeping rules extended to appliances with HFC substitutes

The 2016 rule extended many requirements to substitutes, but existing certifications stayed valid without retesting.

Question 45: How should challenges in core concepts and principles be addressed?

Apply systematic problem-solving, seek expert guidance when needed, and document decisions (Correct answer)
Delegate all challenges to supervisors
Avoid challenges and stick to familiar tasks
Ignore challenges until they resolve themselves

Correct answer: Apply systematic problem-solving, seek expert guidance when needed, and document decisions

Systematic problem-solving combined with appropriate consultation and documentation ensures challenges are addressed effectively.

Question 46: What colors identify an approved refrigerant recovery cylinder?

Blue body with a gray top
Orange body with a red top
Green body with a white top
Gray body with a yellow top (Correct answer)

Correct answer: Gray body with a yellow top

Recovery cylinders have a gray body and a yellow shoulder or top.

Question 47: What ethical standard governs applied methods and techniques practice?

Ethics only apply in academic settings
Ethical standards are optional for certified professionals
Adherence to the profession's code of ethics and applicable laws and regulations (Correct answer)
Ethics are personal opinions, not professional requirements

Correct answer: Adherence to the profession's code of ethics and applicable laws and regulations

Professional ethics codes and applicable laws provide the framework for ethical practice in every professional field.

Question 48: When using system-dependent (passive) recovery on a small appliance with an inoperative compressor, what helps recover the most refrigerant?

Accessing both the high and low sides and heating and tapping the compressor (Correct answer)
Accessing only the low side and waiting
Cooling the compressor with ice
Running the appliance's fan only

Correct answer: Accessing both the high and low sides and heating and tapping the compressor

Two access points plus heating and tapping the compressor frees refrigerant trapped in the oil, which improves recovery.

Question 49: An electronic leak detector shows a leak in a general area. What is the best way to pinpoint the exact location?

Use a halide torch on a sealed system
Check the sight glass
Add more refrigerant and listen
Apply a soap bubble solution (Correct answer)

Correct answer: Apply a soap bubble solution

Bubble solution forms visible bubbles at the exact point where gas escapes.

Question 50: On what date did production of HCFC-22 end in the United States, except for servicing equipment through recovered or reclaimed supply?

January 1, 2030
January 1, 1996
January 1, 2020 (Correct answer)
January 1, 2010

Correct answer: January 1, 2020

Production and import of virgin HCFC-22 ended January 1, 2020, so servicing now relies on recovered, recycled, or reclaimed R-22.

Question 51: Which purity standard must reclaimed refrigerant meet before it can be resold to a different owner?

AHRI 700 (formerly ARI 700) purity standard (Correct answer)
EPA 608 performance standard
OSHA 29 CFR refrigerant standard
ASHRAE Standard 34

Correct answer: AHRI 700 (formerly ARI 700) purity standard

Reclaimed refrigerants must meet AHRI 700 (formerly ARI 700) purity specifications before they can be resold or transferred to a different owner.

Question 52: Which device on a high-pressure system can be damaged and stop working if a technician brazes near it without protection?

The sight glass
The filter-drier
The pressure relief valve (Correct answer)
The service port cap

Correct answer: The pressure relief valve

Heat can damage relief valves and other heat-sensitive parts, so they must be protected or taken off before brazing.

Question 53: After a compressor burnout, what should a technician check the oil for?

Low viscosity from the cold
Acid contamination (Correct answer)
Excess nitrogen
Too much refrigerant dye

Correct answer: Acid contamination

A burnout forms acids that must be found and cleaned out, for example with acid-removing filter-driers, to protect the new compressor.

Question 54: Which EPA program reviews substitute refrigerants and lists them as acceptable or unacceptable for specific end uses?

Significant New Alternatives Policy (SNAP) (Correct answer)
Responsible Appliance Disposal (RAD)
Montreal Protocol Review Board
Energy Star

Correct answer: Significant New Alternatives Policy (SNAP)

The SNAP program evaluates substitutes for ozone-depleting substances by end use.

Question 55: A commercial refrigeration appliance holding 500 lbs or more exceeded its leak threshold. How often must it be inspected for leaks afterward?

Only when the owner requests it
Once every two years
Once a month for life
Every quarter until it goes four quarters without exceeding the threshold (Correct answer)

Correct answer: Every quarter until it goes four quarters without exceeding the threshold

Large commercial and industrial process refrigeration appliances that exceed the threshold need quarterly leak inspections until they show four consecutive quarters below it.

Question 56: How often must most DOT refrigerant recovery cylinders be hydrostatically tested?

Never, after manufacture
Every year
Every 5 years (Correct answer)
Every 10 years

Correct answer: Every 5 years

DOT rules require most refillable recovery cylinders to be hydrostatically retested every five years.

Question 57: Under EPA Section 608 leak repair rules, what is the leak rate threshold for commercial refrigeration appliances with 50 or more pounds of ozone-depleting refrigerant?

15%
10%
30%
20% (Correct answer)

Correct answer: 20%

Since 2019, commercial refrigeration appliances must be repaired when their leak rate exceeds 20%.

Question 58: What does it mean to 'recover' refrigerant under EPA Section 608?

To process refrigerant to new product specifications verified by chemical analysis
To clean refrigerant for reuse by separating oil and passing it through filter-driers
To remove refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it (Correct answer)
To return used refrigerant to the manufacturer for destruction

Correct answer: To remove refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it

Recovery simply means removing refrigerant from a system and storing it in an external container, without testing or processing it.

Question 59: What does 'ODP' stand for in refrigerant classification?

Outdoor Design Parameter
Ozone Depletion Potential (Correct answer)
Optimal Discharge Pressure
Operating Dew Point

Correct answer: Ozone Depletion Potential

ODP (Ozone Depletion Potential) measures how much a refrigerant can destroy stratospheric ozone relative to R-11, which has an ODP of 1.0.

Question 60: How should safety and compliance knowledge be maintained and updated?

Knowledge updates are only needed every five years
Learning stops after certification
Initial training provides lifelong competence
Through continuous professional development, current literature review, and professional networking (Correct answer)

Correct answer: Through continuous professional development, current literature review, and professional networking

Professional competence requires ongoing development through education, literature review, and engagement with the professional community.

Question 61: How should professionals apply industry best practices in daily practice?

Follow standards only for complex tasks
Apply principles selectively based on convenience
Consistently integrate best practices into every aspect of professional work (Correct answer)
Only when being evaluated

Correct answer: Consistently integrate best practices into every aspect of professional work

Consistent application of professional standards ensures quality outcomes and builds professional credibility.

Question 62: Who is responsible for making sure refrigerant has been removed from a small appliance before final disposal, such as at a scrap yard?

The local utility company
The original manufacturer
The appliance's first owner
The final person in the disposal chain (Correct answer)

Correct answer: The final person in the disposal chain

The final person in the disposal chain must recover the refrigerant or verify that it has already been removed.

Question 63: With which federal agency must refrigerant reclaimers register to legally reprocess refrigerants for resale?

AHRI (Air-Conditioning, Heating, and Refrigeration Institute)
ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers)
The Occupational Safety and Health Administration (OSHA)
The U.S. Environmental Protection Agency (EPA) (Correct answer)

Correct answer: The U.S. Environmental Protection Agency (EPA)

Under EPA Section 608 regulations, refrigerant reclaimers must register with the U.S. Environmental Protection Agency to be authorized to reprocess and resell refrigerants.

Question 64: Recovery and recycling equipment made after November 15, 1993 must be certified by whom?

The Department of Transportation
An EPA-approved testing organization such as AHRI or UL (Correct answer)
The state environmental agency
The equipment manufacturer itself

Correct answer: An EPA-approved testing organization such as AHRI or UL

Recovery equipment made after November 15, 1993 must be certified by an EPA-approved laboratory such as AHRI or UL.

Question 65: How should professionals apply communication and documentation in daily practice?

Apply principles selectively based on convenience
Consistently integrate best practices into every aspect of professional work (Correct answer)
Follow standards only for complex tasks
Only when being evaluated

Correct answer: Consistently integrate best practices into every aspect of professional work

Consistent application of professional standards ensures quality outcomes and builds professional credibility.

Question 66: Can a technician's EPA Section 608 certification be affected by violating refrigerant regulations?

Yes, enforcement can include penalties and actions against the technician (Correct answer)
No, certification can never be affected
Only if they move to another state
Only if they fail a CE course

Correct answer: Yes, enforcement can include penalties and actions against the technician

EPA enforcement can result in penalties and other actions for technicians who violate Section 608.

Question 67: Which refrigerants are exempt from the Section 608 venting ban because EPA has decided releasing them poses no threat to the environment?

R-410A
R-22
R-12
Certain substitutes such as ammonia in commercial or industrial process refrigeration, and some hydrocarbons in approved small uses (Correct answer)

Correct answer: Certain substitutes such as ammonia in commercial or industrial process refrigeration, and some hydrocarbons in approved small uses

EPA has exempted certain substitutes, such as ammonia in commercial or industrial process refrigeration and approved hydrocarbon uses, from the venting ban, but HCFCs, CFCs, and HFC blends are not exempt.

Question 68: Before charging a system that has been opened for repair, what must be done after the leak repair?

Pressure-test with nitrogen, then evacuate to remove air and moisture (Correct answer)
Purge the system with compressed air
Add refrigerant straight away to check for leaks
Add extra oil to make up for the lost refrigerant

Correct answer: Pressure-test with nitrogen, then evacuate to remove air and moisture

A nitrogen pressure test confirms the repair, and evacuation removes the non-condensables and moisture that got in.

Question 69: What personal protective equipment is required at minimum when handling refrigerant cylinders and connecting hoses?

Safety glasses and protective gloves (Correct answer)
Hearing protection and hard hat
Face shield only
Respirator and steel-toe boots

Correct answer: Safety glasses and protective gloves

Safety glasses and gloves protect the eyes and skin from liquid refrigerant, which can cause frostbite on contact.

Question 70: How can a technician check a recovery cylinder for noncondensables?

Let it stabilize at a known temperature and compare its pressure to the PT chart (Correct answer)
Weigh it on a scale
Look through the sight glass
Shake it and listen

Correct answer: Let it stabilize at a known temperature and compare its pressure to the PT chart

If pressure is higher than the PT chart shows for that temperature, noncondensables such as air are present.

Question 71: A technician wants to confirm the identity of refrigerant in an unlabeled recovery cylinder at a known temperature. What is the best field method?

Smell the vapor at the valve
Weigh the cylinder
Compare the cylinder pressure to a pressure-temperature chart after it stabilizes (Correct answer)
Check the color of the liquid in a sight glass

Correct answer: Compare the cylinder pressure to a pressure-temperature chart after it stabilizes

A pure refrigerant at a stable known temperature will show a pressure matching its saturation value on a P-T chart.

Question 72: What quality assurance measure supports applied methods and techniques?

Quality checks are unnecessary for experienced professionals
Annual review is sufficient
Regular self-assessment, peer review, and adherence to established standards (Correct answer)
Quality only matters for new practitioners

Correct answer: Regular self-assessment, peer review, and adherence to established standards

Ongoing quality assurance through self-assessment, peer review, and standards adherence ensures continuous improvement.

Question 73: How should assessment and evaluation knowledge be maintained and updated?

Initial training provides lifelong competence
Knowledge updates are only needed every five years
Through continuous professional development, current literature review, and professional networking (Correct answer)
Learning stops after certification

Correct answer: Through continuous professional development, current literature review, and professional networking

Professional competence requires ongoing development through education, literature review, and engagement with the professional community.

Question 74: What is the purpose of installing a filter-drier on the inlet of a recovery machine?

To protect the recovery machine from moisture and contaminants in the system (Correct answer)
To increase the recovery rate
To separate oil from the recovered refrigerant
To measure the quantity of refrigerant recovered

Correct answer: To protect the recovery machine from moisture and contaminants in the system

An inlet filter-drier protects the recovery machine's compressor and valves from moisture, acid, and particulates that may be present in contaminated systems.

Question 75: For appliances holding 50 lbs or more, what must a technician give the owner after adding refrigerant?

A new recovery cylinder
A copy of their driver's license
Nothing, if the owner was present
An invoice or record showing how much refrigerant was added (Correct answer)

Correct answer: An invoice or record showing how much refrigerant was added

Technicians must give the owner documentation showing the amount of refrigerant added so the owner can calculate leak rates.

Question 76: After recovery from a low-pressure chiller reaches the required vacuum, the pressure rises again. What does this indicate?

The rupture disc has failed
The purge unit is working correctly
The recovery is complete
Refrigerant is still present in the system, possibly trapped in oil or water (Correct answer)

Correct answer: Refrigerant is still present in the system, possibly trapped in oil or water

A pressure rise after recovery means more liquid refrigerant is boiling off, so recovery must continue.

Question 77: What is the primary environmental concern with CFC refrigerants such as R-11 and R-12?

High flammability risk
Ozone layer depletion (Correct answer)
Groundwater contamination
High toxicity to humans

Correct answer: Ozone layer depletion

CFC refrigerants release chlorine atoms when broken down by UV radiation in the stratosphere, which catalytically destroy ozone molecules.

Question 78: How should core concepts and principles knowledge be maintained and updated?

Initial training provides lifelong competence
Learning stops after certification
Through continuous professional development, current literature review, and professional networking (Correct answer)
Knowledge updates are only needed every five years

Correct answer: Through continuous professional development, current literature review, and professional networking

Professional competence requires ongoing development through education, literature review, and engagement with the professional community.

Question 79: What quality assurance measure supports communication and documentation?

Quality checks are unnecessary for experienced professionals
Regular self-assessment, peer review, and adherence to established standards (Correct answer)
Annual review is sufficient
Quality only matters for new practitioners

Correct answer: Regular self-assessment, peer review, and adherence to established standards

Ongoing quality assurance through self-assessment, peer review, and standards adherence ensures continuous improvement.

Question 80: Which refrigerant is an azeotropic blend made of R-22 and R-115?

R-404A
R-134a
R-502 (Correct answer)
R-410A

Correct answer: R-502

R-502 is a 500-series azeotrope of HCFC-22 and CFC-115.

Question 81: What is the required evacuation level for an HCFC-22 appliance containing less than 200 lb of refrigerant when using recovery equipment made after November 15, 1993?

4 inches Hg vacuum
29 inches Hg vacuum
0 inches Hg (Correct answer)
10 inches Hg vacuum

Correct answer: 0 inches Hg

HCFC-22 appliances with less than 200 lb of refrigerant must be evacuated to 0 inches Hg.

Question 82: When charging liquid blend into the suction side of an operating system, what is the best practice?

Meter or throttle the liquid so it vaporizes before reaching the compressor (Correct answer)
Open the cylinder fully to charge quickly
Invert the system
Charge only with the compressor off and the cylinder heated

Correct answer: Meter or throttle the liquid so it vaporizes before reaching the compressor

Throttling the liquid keeps liquid refrigerant from slugging the compressor and damaging the valves.

Question 83: How often does a Section 608 technician certification have to be renewed?

Every 3 years
Every year
Every 5 years
It does not expire (Correct answer)

Correct answer: It does not expire

Section 608 technician certification has no expiration date.

Question 84: Which type of refrigerant blend can fractionate and has temperature glide?

Zeotropic blend (400 series) (Correct answer)
Azeotropic blend (500 series)
Pure CFC
Single-component HFC

Correct answer: Zeotropic blend (400 series)

Zeotropic blends like the 400 series change composition and temperature as they evaporate or condense.

Question 85: Why might a technician heat the compressor crankcase during recovery?

To burn off acid
To release refrigerant dissolved in the oil (Correct answer)
To raise the oil level
To prevent the recovery cylinder from overfilling

Correct answer: To release refrigerant dissolved in the oil

Refrigerant dissolves in compressor oil, and gentle heat drives it out so more can be recovered.

Question 86: An owner decides not to repair a leaking appliance that exceeds the threshold. How soon must a retrofit or retirement plan be developed?

Within 90 days
Within 10 days
Within 30 days (Correct answer)
Within 1 year

Correct answer: Within 30 days

If leaks will not be repaired, a retrofit or retirement plan must be developed within 30 days.

Question 87: What is the best practice for recovering different refrigerants on the same job?

Combine them in one cylinder to save space
Vent the smaller amount and recover the larger
Use a separate dedicated cylinder for each refrigerant (Correct answer)
Mix them only if they have similar pressures

Correct answer: Use a separate dedicated cylinder for each refrigerant

Mixed refrigerants often can't be reclaimed and may need costly destruction, so each refrigerant gets its own cylinder.

Question 88: What is the minimum required evacuation level (in microns) for most commercial refrigeration systems before recharging?

5,000 microns
500 microns (Correct answer)
50 microns
29 inches Hg on manifold gauge

Correct answer: 500 microns

Industry best practice and most equipment manufacturer specifications require evacuation to 500 microns or lower before charging a commercial refrigeration system.

Question 89: What is the foundational principle of applied methods and techniques in the Environmental Protection Agency Certified Lead Contractors field?

Maintaining competence, integrity, and service to stakeholders (Correct answer)
Following the easiest path available
Maximizing personal advancement
Avoiding all challenging situations

Correct answer: Maintaining competence, integrity, and service to stakeholders

The foundational principles of applied methods and techniques in Environmental Protection Agency Certified Lead Contractors center on maintaining competence, integrity, and quality service.

Question 90: If a technician finds an unexpected substitute refrigerant (such as a hydrocarbon) in a small appliance, what is the correct action?

Follow the manufacturer's or substitute's instructions and avoid mixing it with other refrigerants (Correct answer)
Add R-134a to dilute it
Vent it, since substitutes are always exempt
Recover it into the same cylinder as the R-12

Correct answer: Follow the manufacturer's or substitute's instructions and avoid mixing it with other refrigerants

Unknown or flammable substitutes need special handling and must never be mixed into standard recovery cylinders.

Question 91: A 100-pound commercial refrigeration system required 10 pounds of refrigerant 73 days after its last charge. Using the annualizing method, what is the leak rate?

73%
10%
25%
50% (Correct answer)

Correct answer: 50%

(10 ÷ 100) × (365 ÷ 73) × 100 = 0.10 × 5 × 100 = 50%.

Question 92: After removing liquid refrigerant from a large low-pressure chiller, why does a lot of refrigerant remain?

The rupture disc traps it
A large amount stays as vapor in the system's large volume (Correct answer)
It is all absorbed into the water tubes
Low-pressure refrigerants cannot exist as vapor

Correct answer: A large amount stays as vapor in the system's large volume

Low-pressure refrigerants have low vapor density, but a chiller's big internal volume can still hold a lot of vapor, which must be recovered too.

Question 93: After recovering refrigerant, what information must be recorded on the recovery cylinder?

Refrigerant type, amount recovered, and date (Correct answer)
Only the cylinder tare weight
Technician's name only
The system model number and serial number

Correct answer: Refrigerant type, amount recovered, and date

Recovery cylinders must be labeled with the refrigerant type and amount to prevent mixing refrigerants and ensure proper handling during reclamation.

Question 94: How can a technician speed up recovery by manipulating the recovery cylinder?

Fill the cylinder with nitrogen first
Heat the recovery cylinder with a torch
Chill the recovery cylinder to lower its pressure (Correct answer)
Lay the cylinder on its side

Correct answer: Chill the recovery cylinder to lower its pressure

Cooling the recovery cylinder lowers its pressure, increasing the pressure difference that drives refrigerant into it.

Question 95: What distinguishes refrigerant 'recycling' from refrigerant 'reclamation'?

Recycling and reclamation are the same process with different names
Recycling requires EPA certification; reclamation does not
Recycling cleans refrigerant on-site for reuse in the same owner's equipment; reclamation reprocesses it off-site to AHRI 700 purity standards (Correct answer)
Recycling involves off-site reprocessing; reclamation is done on-site

Correct answer: Recycling cleans refrigerant on-site for reuse in the same owner's equipment; reclamation reprocesses it off-site to AHRI 700 purity standards

Recycling refers to on-site cleaning of refrigerant for reuse in the same or same owner's equipment, while reclamation involves off-site reprocessing at a certified facility to meet AHRI 700 purity standards.

Question 96: Which process requires refrigerant to meet AHRI Standard 700 purity specifications?

Recycling
Evacuation
Reclamation (Correct answer)
Recovery

Correct answer: Reclamation

Reclamation processes refrigerant to new-product specifications per AHRI 700, verified by chemical analysis.

Question 97: Why is a large refrigerant leak in an enclosed mechanical room dangerous to technicians?

Refrigerant vapor always ignites spontaneously
Refrigerant vapor is corrosive to skin on contact
Refrigerant vapor is lighter than air and rises to the ceiling
Refrigerant vapor is heavier than air and can displace oxygen, causing asphyxiation (Correct answer)

Correct answer: Refrigerant vapor is heavier than air and can displace oxygen, causing asphyxiation

Most refrigerant vapors are heavier than air and can displace oxygen in low or enclosed spaces, leading to suffocation.

Question 98: When using a system-dependent (passive) recovery method on a small appliance with an inoperative compressor, what helps release refrigerant trapped in the oil?

Accessing only the low side
Adding nitrogen to the compressor crankcase
Accessing both high and low sides and tapping or heating the compressor (Correct answer)
Running the system fan only

Correct answer: Accessing both high and low sides and tapping or heating the compressor

With an inoperative compressor, accessing both sides and tapping or warming the compressor helps release refrigerant dissolved in the oil.

Question 99: A service company recovers R-22 from multiple customer systems and stores it all in the same cylinder. What is a critical concern with this practice?

Mixing refrigerant from different systems is always permitted as long as it is the same refrigerant type
Cross-contamination between systems can compromise refrigerant quality and may require full reclamation before reuse (Correct answer)
The only concern is exceeding the cylinder's maximum fill weight
R-22 cannot legally be recovered from more than one system per cylinder

Correct answer: Cross-contamination between systems can compromise refrigerant quality and may require full reclamation before reuse

Combining refrigerant from multiple systems risks cross-contamination with different oil types, moisture levels, or contaminants, which may require full reclamation before the refrigerant can be safely reused.

Question 100: Why should oxygen or compressed air never be used to pressurize a refrigeration system?

They react with refrigerant to form CFCs
They freeze the expansion valve
They are not detectable with soap bubbles
They can cause an explosion when mixed with compressor oil under pressure (Correct answer)

Correct answer: They can cause an explosion when mixed with compressor oil under pressure

Oxygen or air mixed with oil under pressure can ignite or explode.

EPA Section 608 Universal Technician Certification

The EPA Section 608 Universal Certification exam tests HVAC technicians on refrigerant handling, recovery, recycling, and reclamation regulations across all system types. Earning Universal certification requires passing all four independent sections: Core, Type I, Type II, and Type III.

100

Questions

120 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds