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EPA 608 NEC 2023

EPA 608 Type II & III Practice Test 4

This test focuses on Type III equipment: large centrifugal chillers used in hospitals, malls, and universities. It covers the below-atmospheric pressure distinction and compares chiller certification scope to Type II.

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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: Type III chillers run below atmospheric pressure, the opposite of Type II. A leak on a chiller pulls air in; it does not push refrigerant out.

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EPA 608 Type II & III Practice Test 4 — Question List

Question 1: What type of equipment is a large low-pressure (R-123) centrifugal chiller used to cool hospitals, malls, and universities?

Type III
Type I
Type II
Universal only

Question 2: Type III equipment operates at what pressure compared to the atmosphere?

Above atmospheric pressure
Exactly at atmospheric pressure
Pressure is not relevant
Below atmospheric pressure

Question 3: If a Type III chiller has a leak, what happens?

Refrigerant is pushed out into the room
Outside air is pulled into the system
Nothing happens because chillers do not leak
The compressor shuts off automatically

Question 4: A technician notices rising pressure readings and a build-up of non-condensable gases inside a low-pressure chiller over time, even though no refrigerant was added. What is the most likely explanation?

The refrigerant is multiplying
Air and moisture are leaking into the system because it runs below atmospheric pressure
The chiller is overcharged
The purge unit is adding refrigerant

Question 5: True or False: Type III equipment operates above atmospheric pressure, just like Type II.

True
True, only during startup
True, only in summer
False

Question 6: Which of the following is a Type III appliance?

Residential split system
Rooftop package unit
Large low-pressure centrifugal chiller
Walk-in cooler

Question 7: Why is a leak on a Type III chiller often harder to notice right away than a leak on a Type II system?

Chillers do not have leaks
There is no refrigerant loss to smell or see escaping; instead, air leaks in quietly
Chillers are always outdoors
Chillers use a different refrigerant that has no smell

Question 8: Large centrifugal chillers are most commonly found cooling what kind of buildings?

Hospitals, malls, and universities
Single-family homes
Small offices
Food trucks

Question 9: A building engineer reports that a low-pressure chiller's purge unit has been running longer than usual, removing more air than normal. What does this most likely indicate?

The chiller has too much refrigerant
The purge unit is broken and adding air on purpose
The building's air conditioning is set too low
The chiller has a leak, letting outside air in

Question 10: Which statement correctly compares Type II and Type III equipment?

Type II is always bigger than Type III
Type III is only used in homes
Type II and Type III use identical leak testing methods
Type II runs above atmospheric pressure; Type III runs below it

Question 11: A large low-pressure chiller cooling a university campus most likely requires which certification?

Type I
Type II
No certification needed
Type III

Question 12: True or False: A technician with only Type II certification is authorized to service a low-pressure centrifugal chiller.

True
True, if supervised
False
True, if the chiller is small

Question 13: A technician with Universal certification, covering Core, Type I, Type II, and Type III, is asked to service a low-pressure chiller. Is this technician authorized?

Yes, Universal certification includes all four categories, including Type III
No, Universal certification does not include Type III
Only if they also have a separate chiller license
No, chillers require a special state license instead

Question 14: What is the opposite relationship between leaks and pressure for Type II versus Type III equipment?

Type II leaks pull air in; Type III leaks push refrigerant out
Both push refrigerant out
Type II leaks push refrigerant out; Type III leaks pull air in
Both pull air in

Question 15: Which term describes equipment operating at a pressure lower than the surrounding air?

Low-pressure, or vacuum
High-pressure
Neutral pressure
Overpressure

Question 16: A facilities manager says their building's chiller never loses refrigerant because the gauges never show a pressure drop. Why might this be misleading for a low-pressure chiller?

The gauges are broken
Low-pressure chillers cannot leak
A leak on a low-pressure chiller pulls air in rather than releasing pressure, so it may not show as a simple pressure drop
The refrigerant would evaporate before showing on gauges

Question 17: What evacuation level must a low-pressure (R-123) chiller reach before it is opened, using recovery equipment made after November 15, 1993?

10 in. Hg vacuum, like a small high-pressure system
25 mm Hg absolute (about 29 in. Hg vacuum)
15 in. Hg vacuum, like a large medium-pressure system
0 psig, since it already runs in a vacuum

Question 18: True or False: Type III chillers are generally larger, more specialized equipment than typical Type II appliances.

False
True
True, only in cold climates
False, they are always smaller

Question 19: Which of these describes why Type III certification is a separate category from Type II?

Type III equipment is identical to Type II, just bigger
Type III equipment has different pressure behavior and requires different service knowledge
Type III equipment does not use refrigerant
Type III equipment is always outdoors

Question 20: A shopping mall's central air conditioning uses a large R-123 centrifugal chiller. Which best describes its likely pressure behavior?

Above atmospheric pressure, like a rooftop unit
Exactly atmospheric pressure
Below atmospheric pressure, since R-123 chillers are low-pressure equipment
It has no measurable pressure

Question 21: A technician transfers from residential HVAC work to a hospital's central plant, which uses large chillers. The technician holds Core, Type I, and Type II certification. Can they legally begin chiller work?

No, they need Type III certification specifically for chiller work
Yes, because they already have Core and Type II
Yes, because hospitals are exempt from certification rules
Yes, as long as they have five years of experience

Question 22: Which pressure condition is unique to Type III equipment compared to Type II?

Operating below atmospheric pressure
Operating above atmospheric pressure
Operating at extremely high pressure
Having no pressure at all

Question 23: True or False: A leak on a Type III chiller can introduce moisture into the system along with air.

False
True, but only in winter
True
False, chillers are sealed against moisture

Question 24: What is a likely long-term effect of air and moisture continually leaking into a low-pressure chiller?

Build-up of non-condensable gases and potential moisture-related problems inside the system
Improved efficiency
The refrigerant charge increases on its own
The chiller automatically repairs the leak

Question 25: Which statement best summarizes the core difference between Type II and Type III equipment covered in this test?

Type II is for large buildings; Type III is for homes
Type II runs above atmospheric pressure and leaks push refrigerant out; Type III runs below atmospheric pressure and leaks pull air in
Both operate at the same pressure
Only Type III requires any certification

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)