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EPA 608 NEC 2023

EPA 608 Type 3 Exam Practice Test 3

Take a Free Practice Test EPA Certification Type 3

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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.

How to Use This Practice Test

This EPA 608 Type 3 Exam Practice Test 3 has 10 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: The EPA 608 exam is NOT open book — memorize refrigerant ODP/GWP values and recovery rules before the exam.

Topics covered: Refrigerant regulations, recovery procedures, leak detection, and refrigerant properties.
Passing score: 70% required on each section. Universal certification requires passing all four sections.
Questions: 10 multiple-choice, one correct answer each

10

Questions

15 min

Time

70%

Pass

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EPA 608 Type 3 Exam Practice Test 3 — Question List

Question 1: How much of vapor contains in a 350 ton R-11 chillier after all the liquid has been removed?

100 lbs
150 lbs
50 lbs
200 lbs

Question 2: By using a large vacuum pumps can cause trapped water freezing, what a technician can do to prevent this?

He should increase the system pressure by introducing nitrogen gas.
He should decrease the system pressure by introducing nitrogen gas
He should remove the liquid refrigerant before vapor liquid
He should remove the vapor refrigerant before liquid refrigerant.

Question 3: What should be done for low pressure refrigeration system when the system is idle?

The refrigerant should be recovered and kept the system idle.
The pressure in the system should increase to higher than atmosphere to prevent air accumulation in system
The oil must be removed from refrigeration system periodically
Nitrogen gas must be purged in to the system to prevent moisture freezing

Question 4: 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 5: The purpose of purge unit in the low pressure refrigeration system :

Removes the refrigerant from the system
Removes the air from the system
Removes the oil from the system

Question 6: Which of the following device will help in evacuating vapor fast from the refrigeration system?

A heater placed on recovery vessel side
A high vacuum pump can be used for recovery
A nitrogen gas can be purged in to system

Question 7: In which part of low pressure refrigeration system the leaks may occur?

Expansion valve
Gaskets & Fittings
Condenser tube
Evaporator fittings

Question 8: What damage causes to the low pressure refrigeration system if the pressure increases more than 10 psig?

Rupture disk fails
Gaskets & Fittings may fail
Shaft seals may fail
Large leak may occur in the system

Question 9: For heat removal in water cooled condensing system, where does the water come from?

Condenser recycling unit
Evaporator auxiliary unit
Deep wells
Municipal water supply

Question 10: In low pressure system whether the refrigerant can go out of the system?

Yes
No

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

Questions10

Time limit15 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

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Source: EPA Section 608 (40 CFR Part 82)