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EPA 608 NEC 2023

EPA 608 Type 3 Exam Practice Test 8

Free EPA 608 Type III Exam Practice Test 8. 25 questions covering large vacuum pump risks with trapped water, air entering low-pressure systems through leaks, liquid charging at 36°F saturation temperature, heating refrigerant bottle to speed vapor charging, oil-free vapor recovery, external heat for partial charge leak checks, R-11 boiling point at atmospheric pressure, rupture disk connected to evaporator, freezing risk when charging under deep vacuum, purge compressor on condenser top, R-123 vs R-11 retrofit comparison, Type III certification exam requirements, centrifugal chiller oil analysis and acid testing, filter drier replacement policy, ASHRAE Standard 15 review, refrigerant cylinder handling safety, Section 608 penalties and violations, triple evacuation procedure advantages, EPA recovery equipment certification, low-pressure chiller monitoring and diagnostics, and refrigerant leak repair documentation requirements.

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The EPA 608 certification is required by law for any technician who purchases or handles refrigerants. It covers safe handling, leak detection, recovery, and environmental regulations.

Type I covers small appliances (≤5 lbs refrigerant), Type II covers high-pressure systems, Type III covers low-pressure systems, and Universal covers all three. Most HVAC technicians pursue Universal certification.

You must score at least 70% on each section of the exam. The Universal exam has four parts: core, Type I, Type II, and Type III.

Key topics for this final Type III test: A large vacuum pump can freeze trapped water in a system — raise pressure with nitrogen before continuing. Because low-pressure systems operate below atmospheric pressure, any leak draws air IN (not refrigerant out). When charging a low-pressure system, wait until the saturation temperature reaches 36°F before adding liquid — adding liquid while the system is at deep vacuum risks freezing tube water. The rupture disk is connected to the evaporator and bursts at 15 PSIG as a safety relief.

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EPA 608 Type 3 Exam Practice Test 8 — Question List

Question 1: If a large vacuum pump is used during evacuation …………….

It may cause freezing of trapped water
The evacuation process will speed up
The refrigerant may get freeze in the evacuation hoses

Question 2: In low pressure system whether the refrigerant can go out of the system?

Yes
No

Question 3: Under which of the following condition it is better start charging using liquid refrigerant?

When refrigerant saturation temperature reaches 360 F
When the refrigerant saturation temperature reaches 56 0F
When the temperature of water is above 360F
When the temperature of water reaches 560F

Question 4: Heating a refrigerant bottle will speed of ………………………….

Vapour charging
Liquid charging

Question 5: Which of the following recovery method does not pull the oil from the system during evacuation?

Vapour recovery
Liquid recovery

Question 6: A partial charge low pressure system can be effectively leak checked by ……………

Compressed air
Pressurized liquid nitrogen
Adding high pressure HCFC-22 refrigerant
Increasing refrigerant pressure by adding external heat source.

Question 7: Which of the following is a boiling temperature of a R-11 refrigerant at a pressure of 14.7 PSIA?

60.3 F
70.5 F
74.5 F
84.5 F

Question 8: In a low pressure refrigeration system the rupture disk is connected to ………………..

Evaporator
Condenser
Receiver
Liquid pump

Question 9: If the liquid charging into the refrigeration system is under 29 Hg vacuum then ………………….

The charging time increases
The water in the system freezes
The refrigerant may freeze in the system
The vapour in the system freezes

Question 10: The purge compressor is typically connected on top of ………………. In low pressure chiller refrigeration system.

Condenser
Oil separator
Chillier
Purge drum

Question 11: When an existing R-11 centrifugal chiller is retrofitted to use R-123, what must be changed regarding the lubricating oil?

No oil change is needed — mineral oil and R-123 are fully compatible in centrifugal systems
Mineral oil must be completely removed and replaced with alkylbenzene (AB) oil — R-123 and mineral oil are not fully miscible, causing heat transfer loss and oil accumulation in the evaporator
Replace mineral oil with POE oil — POE is the universal replacement when upgrading from CFC systems
Only change the oil if the system capacity drops more than 10% after refrigerant retrofit

Question 12: What is required to obtain EPA 608 Type III certification?

Pass a written exam AND complete at least 1 year of documented on-the-job training in low-pressure system service
Pass the Type III written exam administered by an EPA-approved certifying organization — no minimum work experience or training course is required by EPA
Complete an approved training program and submit a portfolio of chiller service records for EPA review
Pass both a written exam and a practical (hands-on) skills test administered by an EPA inspector

Question 13: Why is periodic oil acid testing important for R-123 centrifugal chillers, and what does a positive acid result indicate?

Acid testing measures oil acidity from normal wear — high acid means the compressor bearings are failing and should be replaced
R-123 reacts with moisture to form hydrochloric and hydrofluoric acid; a positive acid test indicates moisture is present, causing corrosion — triggering filter drier replacement and moisture source investigation
Acid testing is only required when the system is retrofitted from R-11 to R-123 — not for routine maintenance
Oil acid testing detects whether the alkylbenzene oil needs to be replaced — acid forms naturally as AB oil ages and degrades

Question 14: A technician is repairing a leak on an R-123 centrifugal chiller. After the repair, the technician says "the filter drier was just replaced 6 months ago so we can skip replacing it this time." Is this correct?

Correct — if the filter drier was changed within the past year, it does not need to be replaced on every subsequent opening
Incorrect — the filter drier must be replaced every time the system is opened, regardless of when it was last changed; each opening adds moisture that partially depletes desiccant capacity
Correct — filter drier replacement is only required if the system showed acid contamination in the previous oil analysis
Incorrect — filter driers never need to be replaced; they regenerate their desiccant capacity during operation

Question 15: A building manager asks "Does ASHRAE Standard 15 only apply to large commercial buildings with centrifugal chillers?" How should the technician respond?

Yes — ASHRAE Standard 15 only applies to low-pressure centrifugal chiller rooms over 1,000 tons capacity
No — ASHRAE Standard 15 applies to all refrigeration equipment rooms; the requirements are critical wherever large refrigerant charges could create oxygen-deficient or toxic atmospheres in enclosed spaces
ASHRAE Standard 15 is a voluntary guideline, not a mandatory standard — equipment rooms are only subject to it if local codes adopt it
No — ASHRAE Standard 15 only applies to systems using toxic refrigerants; R-123 does not require it because it is classified as low-toxicity

Question 16: A technician is preparing to add R-11 vapor to a low-pressure chiller to raise the pressure before leak testing. The refrigerant cylinder feels cold and vapor flow is very slow. What technique can be used to speed up vapor charging, and what is the safety limit?

Use an electric heat blanket set to 180°F wrapped around the cylinder to quickly increase vapor pressure
Apply warm water (not exceeding 125°F) to the outside of the cylinder — never use open flame or steam which can overpressure and rupture the cylinder
Tip the cylinder upside down so liquid R-11 can flow in, then return it upright to vaporize more quickly
Connect nitrogen to the cylinder valve and pressurize the cylinder to push vapor out faster

Question 17: What is the maximum civil penalty per day per violation under EPA Section 608, and can the EPA pursue criminal penalties for intentional violations?

The maximum civil penalty is $1,000 per day and there are no criminal penalties under Section 608
The maximum civil penalty is $44,539 per day per violation; knowing and willful violations can also result in criminal penalties including fines and imprisonment
The maximum civil penalty is $25,000 per incident and there are no criminal penalties — criminal enforcement requires a separate federal statute
There are no federal penalties for Section 608 violations — enforcement is handled entirely by state environmental agencies

Question 18: What advantage does triple evacuation provide over a single deep evacuation to the same final vacuum level?

Triple evacuation has no advantage over a single deep evacuation — vacuum level is all that matters
Nitrogen breaks between pulls disperse moisture from metal surfaces into the vapor phase, allowing subsequent evacuation pulls to remove more moisture than a single uninterrupted pull to the same vacuum level
Triple evacuation reduces the final vacuum level achieved — three shorter pulls are more effective than one long pull
Triple evacuation is required only for systems over 500 lbs charge — smaller systems can use single evacuation

Question 19: What requirement must recovery equipment meet before a certified technician can use it to recover refrigerant from a centrifugal chiller under Section 608?

No certification is required for recovery equipment — any device that removes refrigerant from a system satisfies Section 608
Recovery equipment must be certified by an EPA-approved body (such as UL or AHRI) confirming it meets minimum recovery efficiency standards — for Type III, the equipment must reach 25 mm Hg absolute
Only company-owned recovery equipment needs certification — rented equipment is exempt
Recovery equipment certification is voluntary — technicians must only use certified equipment for government-owned buildings

Question 20: During operation of an R-123 centrifugal chiller, the purge unit run time has increased from 2 minutes per day to 45 minutes per day over the past month. What does this indicate?

The purge unit is working harder because the cooling load has increased — higher load creates more non-condensables
Increased purge run time indicates air is entering the system through a leak — in a sub-atmospheric system, any breach draws air inward continuously
The purge unit needs lubrication — run time increases indicate a mechanical purge unit problem, not a system air leak
This is normal for spring startup — winter air trapped in the system always takes weeks to purge

Question 21: After repairing a leak on a system where the annual leak rate exceeded the applicable threshold, what must the owner document within 30 days?

No documentation is required after a repair — only the original threshold exceedance must be recorded
The owner must document: date threshold was exceeded, date repair was made, type of repair, leak verification method, and technician certification number — retained for 3 years
The EPA must be directly notified with a written report within 30 days — records are submitted to EPA, not kept on-site
Only systems over 500 lbs require post-repair documentation — smaller systems are exempt

Question 22: Why is it critical to add vapor FIRST (rather than liquid) when initially charging a low-pressure centrifugal chiller after evacuation?

Vapor charging first is just a convenient technique — either liquid or vapor can be charged first with no difference in outcome
At deep vacuum, adding liquid refrigerant first causes rapid evaporation that chills the evaporator tubes below 32°F — freezing the tube water and damaging the evaporator; vapor charging first raises saturation temperature to 36°F before liquid is safe to add
Vapor must be added first because liquid refrigerant cannot flow into a system under vacuum — it requires positive pressure to push liquid in
Vapor charging prevents air from entering the system during the initial charge — liquid charging would create a vacuum that sucks air in through service connections

Question 23: A low-pressure centrifugal chiller has been partially recharged (only 30% of full charge) after a major repair. The technician needs to perform a leak check before completing the full recharge. How can the technician create enough pressure for leak detection if the system is still under vacuum conditions at the partial charge?

Complete the full refrigerant charge first before performing any leak check — partial charges cannot be leak tested
Apply controlled external heat to raise refrigerant pressure above atmospheric (maximum 10 PSIG) so refrigerant escapes at leak points for detection, or alternatively pressurize with dry nitrogen to ≤5 PSIG
Use the ASHRAE vacuum rise test — if the partial charge holds vacuum for 15 minutes, no leaks are present
Add a full charge of nitrogen to bring pressure to 50 PSIG for a thorough pressure test

Question 24: During evacuation of a centrifugal chiller's refrigerant side, why must the chilled water and condenser water systems be circulating?

Water circulation is only needed to keep the condenser tubes from scale buildup during the service period
At deep vacuum, water's boiling point drops to or below 32°F — standing water in the tubes would freeze and rupture them; circulation keeps flowing warm water above freezing throughout the pull
Water must circulate to prevent the vacuum pump from overheating — without water flow, the pump heat transfers to the chiller
Circulating water prevents nitrogen from the triple evacuation process from dissolving into stagnant water

Question 25: A technician notes that a centrifugal chiller is missing its accumulator between the evaporator and compressor. Under what operating condition is this most likely to cause serious compressor damage?

The risk is greatest during full-load summer operation — high refrigerant flow requires the accumulator to prevent surging
The risk is greatest during startup or when the evaporator is flooded — unevaporated liquid refrigerant reaches the compressor impeller causing liquid slugging, which can instantly destroy the impeller and bearings
No operating condition poses a risk without the accumulator — centrifugal compressors are designed to handle both liquid and vapor
The risk is greatest when the purge unit is running — purge unit operation diverts liquid refrigerant to the suction line

Study Tip: The EPA 608 exam is closed book. Memorize: recovery is required before opening any refrigerant system. Venting refrigerant is illegal. Know the ODP and GWP values for R-22, R-410A, R-134a, R-32, and R-454B.

EXAM CARD EPA 608

Questions25

Time limit45 min

Pass score70%

RegulationEPA Section 608

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: EPA Section 608 (40 CFR Part 82)