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EPA 608 NEC 2023

EPA 608 Type II & III Practice Test 5

This test covers the standard Type III leak testing method: using hot water to raise a chiller's internal pressure above atmospheric before checking for leaks. It also covers why the Type II nitrogen method does not apply the same way.

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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.

Type II & III Exam Tip: A classic exam trap: Type III chillers are leak tested with hot water to raise pressure, not with the Type II-style nitrogen method.

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EPA 608 Type II & III Practice Test 5 — Question List

Question 1: What method is used to leak test a Type III low-pressure chiller?

Nitrogen pressure test, the same as Type II
Hot water, or heat, to raise internal pressure above atmospheric
Soap bubbles applied cold
No leak testing is needed since chillers run in a vacuum

Question 2: Why can't a technician just use standard nitrogen pressure testing, the Type II way, on a low-pressure chiller that is currently at vacuum?

Nitrogen is too expensive for chillers
Nitrogen does not exist in large sizes
Chillers cannot hold any gas at all
The chiller must first be raised above atmospheric pressure using heat before typical positive-pressure leak detection makes sense; simply adding nitrogen the Type II way is not the standard Type III method

Question 3: True or False: Hot water is used on Type III chillers to temporarily raise internal pressure above atmospheric so leaks can be found.

True
False
True, but only in summer
False, hot water is never used on chillers

Question 4: A technician applies heat to raise a chiller's internal pressure before a leak check. What is this heat most commonly delivered with?

A blow torch directly on the shell
Hot water
Dry ice
Compressed air

Question 5: A technician is asked to leak test a hospital's centrifugal chiller and plans to pressurize it with dry nitrogen right away, the same way as on a rooftop unit. What is wrong with this plan?

Nothing, it is the correct method for both
The chiller starts below atmospheric pressure; the standard approach is to raise pressure with hot water first, not to jump straight to a Type II-style nitrogen test
Nitrogen will destroy the chiller
The chiller has no way to accept nitrogen

Question 6: True or False: Once a Type III chiller's pressure is raised above atmospheric with hot water, standard leak detection methods can be used to find the leak.

False
True
True, but only UV dye works
False, no detection method works on chillers

Question 7: What is the purpose of raising a low-pressure chiller's internal pressure with hot water before a leak test?

To cool the refrigerant
To make it behave like a positive-pressure system so leaks can be found
To boil off all refrigerant
To clean the internal coils

Question 8: A chiller technician has finished heating the system with hot water and confirmed it is now above atmospheric pressure. What should be done next to find a leak?

Immediately shut the system down
Apply standard leak detection, such as an electronic detector or soap bubbles, at suspect joints
Add refrigerant before checking
Wait 48 hours with no further action

Question 9: Which of the following is a common exam trap related to Type III leak testing?

Believing that Type II-style nitrogen pressure testing is the standard Type III method, when hot water is actually standard
Believing hot water is used, when nitrogen is correct
Believing chillers never leak
Believing chillers use push-pull recovery for leak testing

Question 10: Which leak testing approach is standard for Type III equipment?

Hot water, or heat, method
Nitrogen pressure test
UV dye only
Soap bubbles only, with no other steps

Question 11: Why is raising pressure necessary before leak testing a Type III chiller, but not necessary before leak testing a Type II system?

Type III systems are always warmer
Type II systems cannot be pressurized at all
There is no real difference
Type II systems are already above atmospheric pressure during normal operation, so nothing extra is needed; Type III systems start below atmospheric pressure and must be raised first

Question 12: True or False: Nitrogen pressure testing, as commonly done on Type II systems, is the standard method for Type III chillers.

True
True, only for large chillers
True, only for R-410A chillers
False

Question 13: A technician is asked which leak testing method to use on a low-pressure chiller and a rooftop unit on the same day. What should they remember?

Use hot water on both
Use nitrogen on both
Use UV dye on both, since it works the same everywhere
Use the hot water method on the chiller, Type III, and standard positive-pressure methods, including nitrogen, on the rooftop unit, Type II

Question 14: What state does refrigerant inside a low-pressure chiller normally exist in, given the below-atmospheric pressure?

It always freezes solid
It cannot exist as a liquid
It has no boiling point
It boils at a lower temperature than usual because of the reduced pressure

Question 15: A technician heats a chiller with hot water for a leak test but does not raise the pressure high enough above atmospheric. What is the likely result?

The test works perfectly regardless
The chiller will be damaged immediately
Leaks may be hard to detect because there is not enough outward pressure difference to push gas out at the leak point
The refrigerant will freeze

Question 16: True or False: The hot water method used on Type III chillers is essentially a way to temporarily make the chiller behave like a Type II positive-pressure system for testing purposes.

True
False
True, but only below freezing
False, it does the opposite

Question 17: A facility manager insists that since chillers run at a vacuum, leaks are impossible to find because nothing pushes out. How should a technician explain this is incorrect?

Explain that hot water is used to temporarily raise pressure above atmospheric, so leaks can then be found the same way as on positive-pressure equipment
Agree, chillers cannot be leak tested
Explain that only listening for hissing works
Explain that chillers are tested by weighing the refrigerant only

Question 18: Which statement is TRUE about Type III leak testing?

It never requires changing the system's pressure
It uses only UV dye
It typically involves raising pressure above atmospheric with hot water first
It is identical to the Type II nitrogen method

Question 19: What would likely happen if a technician tried to find a leak on a chiller while it was still at its normal below-atmospheric pressure, using a method meant for positive pressure?

It would likely fail to show the leak, since there is no outward push of gas at a below-atmospheric leak point
It would work exactly the same as on a Type II system
It would show every leak instantly
It would repair the leak automatically

Question 20: Which best matches equipment type to leak testing approach?

Type II - hot water; Type III - nitrogen
Both use hot water
Both use nitrogen
Type II - nitrogen and other positive-pressure methods; Type III - hot water

Question 21: A new technician assumes the same leak-testing steps work on every system, since a leak is a leak. What is the flaw in this thinking?

Type II and Type III systems start at different pressures relative to the atmosphere, so they require different leak testing approaches to work correctly
There is no flaw
Leaks do not actually exist on chillers
Leaks only happen on Type I equipment

Question 22: True or False: Type III chillers require a different standard leak testing method than Type II equipment because of their different operating pressure.

False
True, but only for old chillers
True
False, they use identical methods

Question 23: Which of these correctly completes the sentence: Hot water is used on a low-pressure chiller to ___ before leak testing.

lower the pressure further
freeze the refrigerant
raise the internal pressure above atmospheric
remove all refrigerant

Question 24: After a successful hot water leak test and repair, what should happen to the chiller's pressure before it goes back into normal service?

It should stay pressurized with hot water forever
It should stay filled with nitrogen permanently
It should return to its normal, below-atmospheric operating condition
Nothing further needs to happen

Question 25: Which statement best summarizes Type III leak testing?

It uses the exact same nitrogen method as Type II
It never needs to raise pressure
It uses hot water to temporarily raise pressure above atmospheric so standard leak detection can then be used
It relies only on listening for sounds

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 limit25 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)