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EPA 608 NEC 2023

EPA 608 Type 1 Exam Practice Test 4

Free EPA 608 Type I Exam Practice Test 4. 25 questions on nitrogen as a flushing agent, high-side recovery with operating compressor, passive device recovery vessels, non-condensables in recovery machines, mixed refrigerant reclamation, refrigerant mixing rules, small appliance leak repair obligations, 90% recovery efficiency, sale restrictions on CFCs and HCFCs, technician responsibilities, Montreal Protocol, CFC phase-out date, DOT recovery cylinder types and fill limits, cylinder color coding, hydrostatic testing, AHRI 700 reclamation standard, recycled vs reclaimed refrigerant, R-22 production phase-out, Section 608 vs Section 609, non-condensable purging, ozone depletion and UV radiation, refrigerant purchase restrictions, nitrogen for leak testing, and refrigerant oil compatibility.

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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 facts for this test: Nitrogen is used to flush debris from refrigerant circuits (not oxygen — explosion risk). System-dependent (passive) recovery captures refrigerant in a non-pressurized vessel; self-contained (active) recovery uses a pressurized DOT cylinder. Recovery cylinders must be DOT 4BA or 4BW, painted gray with a yellow top, and must not be filled beyond 80% of capacity. They require a hydrostatic test every 5 years.

25

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45 min

Time

70%

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EPA 608 Type 1 Exam Practice Test 4 — Question List

Question 1: Which of the following is used to flush debris out of the system?

Nitrogen
Oxygen
Refrigerant
Hydrogen

Question 2: If system dependent recovery process is used to recovery the refrigerant from small appliance with operating compressor, the refrigerant can recovery from ………………. of the system

High side
Low side
Liquid side
Discharge side

Question 3: A system dependent recovery machines captures the refrigerant in …………… recovery tank

Pressurized
Non pressurized

Question 4: The self contained recovery machine tank should not contain excessive …………………….

Non condensables
Pressure
Gas

Question 5: What a reclamation facility does if it receives a tank of mixed refrigerant?

They may refuse to process the refrigerant
They may agree to destroy the refrigerant
They may charge a substantial fee for destroying
All other options are correct

Question 6: Which of the following should not be done during recovery?

Do not mix the refrigerants in recovery tank
Do not recover the refrigerant from the liquid line
Do not recovery when the refrigerant pressure is high
Do not purge the system with nitrogen during recovery

Question 7: The refrigerant leaks from small appliances need not be repaired at any case.

True
False

Question 8: The recovery equipment manufactured after November 1993 must be able to remove ……………….. of refrigerant from the refrigeration system with compressor operating.

90 %
80 %
85 %
60 %

Question 9: The sale of CFC’s and HCFC’s is restricted to ……………….

Certified technicians
EPA certified agencies
Authorized owners
Senior technician

Question 10: It is the responsibility of ……………….. any future changes after the technician becomes certified.

EPA authority to communicate
Technician to comply with
Refrigeration system owner to comply with

Question 11: What is the Montreal Protocol, and what was its main purpose?

A US law that required all refrigerants to be replaced with nitrogen
An international agreement (1987) to phase out ozone-depleting substances worldwide
An EPA rule that set the maximum refrigerant charge allowed in small appliances
A Canadian standard for recovery equipment performance testing

Question 12: In the United States, the production and import of CFC refrigerants (such as R-11 and R-12) was completely banned after what date?

December 31, 1993
December 31, 1995
January 1, 2000
January 1, 1990

Question 13: What two types of DOT-approved cylinders are authorized for use as refrigerant recovery cylinders?

DOT 39 and DOT 4A
DOT 4BA and DOT 4BW
DOT 2A and DOT 2AL
DOT 4E and DOT 4B

Question 14: A recovery cylinder must not be filled beyond _______ of its rated gross water capacity (by weight).

90%
80%
100% — cylinders are rated for full capacity
70%

Question 15: What are the standard color markings for a refrigerant recovery cylinder?

Blue body with a green top
Gray body with a yellow top
Yellow body with a gray top
Red body with a white top

Question 16: How often must a DOT-approved refrigerant recovery cylinder be hydrostatically tested?

Every year
Every 5 years
Every 10 years
Every 3 years

Question 17: What standard must reclaimed refrigerant meet before it can be sold to a new owner (used in a different system)?

ARI 740 — performance testing standard
AHRI 700 — purity standard for reclaimed refrigerant
ASHRAE 34 — refrigerant safety classification
DOT 4BA — cylinder specification standard

Question 18: A technician recovers refrigerant from a customer's appliance and cleans it on-site using a recycling machine. Can this refrigerant be sold or transferred to a different customer?

Yes — recycled refrigerant is the same as new refrigerant and can be sold to anyone
No — recycled refrigerant may only be returned to the same owner and same type of equipment
Yes — as long as the technician tests it and it passes a moisture test
Yes — recycled refrigerant can be sold to any certified technician

Question 19: Under the Clean Air Act phase-out rules, the production and import of R-22 (HCFC-22) was completely banned in the United States after what date?

December 31, 1995
January 1, 2020
January 1, 2010
January 1, 2030

Question 20: A technician wants to service the air conditioning system in a customer's car. Which section of the Clean Air Act covers motor vehicle air conditioning (MVAC) systems?

Section 608 — it covers all refrigerant-containing equipment
Section 609 — which specifically covers motor vehicle air conditioning systems
Section 612 — which covers automotive systems
Car A/C is not regulated by the Clean Air Act

Question 21: A recovery cylinder contains non-condensable gases (such as air or nitrogen) that are mixing with the recovered refrigerant. Where do non-condensables collect in the cylinder, and how should they be removed?

At the bottom of the cylinder; drain them through the liquid port
At the top of the cylinder; purge them carefully from the vapor port
Non-condensables mix evenly throughout the cylinder and cannot be removed
At the top; attach a vacuum pump to remove them

Question 22: What are the main health effects on humans caused by increased ultraviolet (UV) radiation reaching Earth as a result of ozone layer depletion?

Increased risk of respiratory illness and asthma
Increased risk of skin cancer and eye cataracts
Increased risk of heart disease and high blood pressure
UV radiation has no direct health effects on humans

Question 23: Under EPA Section 608, who is allowed to purchase CFC and HCFC refrigerants for servicing stationary equipment?

Anyone — refrigerant can be purchased by any member of the public
Certified technicians, or businesses that employ them
Only engineers licensed by the state
Only suppliers who are licensed by the EPA

Question 24: After pressure-testing a refrigerant circuit with nitrogen, the technician wants to locate a small leak. What is a safe and effective method to find the leak using nitrogen pressure?

Use a halide torch to detect the nitrogen leak
Apply soap solution to joints and look for bubbles
Use a vacuum pump to pull out the nitrogen and check for pressure rise
Nitrogen leaks are invisible — you cannot find them while testing

Question 25: A technician is servicing a new R-410A system. What type of lubricating oil is required for R-410A systems, and why?

Mineral oil — the same oil used in R-12 systems
Polyolester (POE) oil — because it mixes properly with HFC refrigerants
Alkylbenzene (AB) oil — used for all modern refrigerants
No lubrication is needed — R-410A is self-lubricating

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)