EPA Section 608 Type III Certification
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1. What type of refrigeration equipment is covered under EPA Section 608
Type III?
A. Household refrigerators
B. Low-pressure chillers
C. Motor vehicle AC systems
D. Window AC units
Answer: B. Low-pressure chillers
Low-pressure appliances such as centrifugal chillers operate under
vacuum conditions and are specifically covered under Type III.
2. What refrigerant is most commonly used in low-pressure chillers?
A. R-410A
B. R-134a
C. R-11
D. R-22
Answer: C. R-11
R-11 is a low-pressure refrigerant traditionally used in large chillers.
3. At atmospheric pressure, low-pressure refrigerants exist in what state?
A. Solid
B. Liquid
, C. Vapor
D. Plasma
Answer: C. Vapor
Low-pressure refrigerants boil at very low temperatures, so they exist as
vapor at atmospheric pressure.
4. What is the typical operating pressure of a low-pressure chiller evaporator?
A. Above atmospheric pressure
B. At exactly atmospheric pressure
C. Below atmospheric pressure
D. Extremely high pressure
Answer: C. Below atmospheric pressure
These systems operate in a vacuum, making them susceptible to air and
moisture leaks.
5. What is the primary concern when air enters a low-pressure system?
A. Oil contamination
B. Increased pressure
C. Reduced efficiency and corrosion
D. Refrigerant freezing
Answer: C. Reduced efficiency and corrosion
Air introduces moisture, which can lead to acid formation and system
damage.
6. What device is used to remove non-condensables from a low-pressure
system?
A. Compressor
B. Purge unit
C. Receiver
D. Accumulator
Answer: B. Purge unit
Purge units remove air and moisture that enter the system.
,7. When should a purge unit be operated?
A. Continuously
B. Only during shutdown
C. Only when pressure rises
D. Occasionally as needed
Answer: D. Occasionally as needed
Excessive purging indicates leaks; operation should be minimized.
8. Excessive purge unit operation indicates:
A. Proper system function
B. High refrigerant levels
C. Air leaks into the system
D. Low oil levels
Answer: C. Air leaks into the system
Frequent purging suggests that air is entering through leaks.
9. What happens when moisture enters a low-pressure system?
A. Freezing occurs
B. Pressure increases
C. Acid formation occurs
D. Refrigerant evaporates faster
Answer: C. Acid formation occurs
Moisture reacts with refrigerant and oil, forming acids that damage
components.
10.What must be done before opening a low-pressure system for repairs?
A. Add refrigerant
B. Evacuate refrigerant
C. Increase pressure
D. Shut off power only
Answer: B. Evacuate refrigerant
Refrigerant must be properly removed to avoid release into the
atmosphere.
, 11.What is the required evacuation level for low-pressure systems before
opening?
A. 0 psig
B. 10 inches Hg vacuum
C. 25 inches Hg vacuum
D. 15 psig
Answer: C. 25 inches Hg vacuum
EPA requires deep evacuation to minimize emissions.
12.Why are leaks more common in low-pressure systems?
A. High pressure
B. Vacuum conditions draw air inward
C. Poor design
D. High temperatures
Answer: B. Vacuum conditions draw air inward
Any opening allows air to be pulled into the system.
13.What is the purpose of a rupture disc?
A. Increase pressure
B. Prevent leaks
C. Protect against overpressure
D. Store refrigerant
Answer: C. Protect against overpressure
It relieves pressure to prevent system damage.
14.If a rupture disc bursts, what must be done?
A. Ignore it
B. Replace and check for leaks
C. Add refrigerant
D. Restart system immediately
Answer: B. Replace and check for leaks
System integrity must be restored before operation.
Practice Exam Newest Updated 150
Questions And Correct Answers From
Actual Past Papers Exams (Graded A+)
Plus Rationales 2025|2026 Q&A |
Instant Download Pdf
1. What type of refrigeration equipment is covered under EPA Section 608
Type III?
A. Household refrigerators
B. Low-pressure chillers
C. Motor vehicle AC systems
D. Window AC units
Answer: B. Low-pressure chillers
Low-pressure appliances such as centrifugal chillers operate under
vacuum conditions and are specifically covered under Type III.
2. What refrigerant is most commonly used in low-pressure chillers?
A. R-410A
B. R-134a
C. R-11
D. R-22
Answer: C. R-11
R-11 is a low-pressure refrigerant traditionally used in large chillers.
3. At atmospheric pressure, low-pressure refrigerants exist in what state?
A. Solid
B. Liquid
, C. Vapor
D. Plasma
Answer: C. Vapor
Low-pressure refrigerants boil at very low temperatures, so they exist as
vapor at atmospheric pressure.
4. What is the typical operating pressure of a low-pressure chiller evaporator?
A. Above atmospheric pressure
B. At exactly atmospheric pressure
C. Below atmospheric pressure
D. Extremely high pressure
Answer: C. Below atmospheric pressure
These systems operate in a vacuum, making them susceptible to air and
moisture leaks.
5. What is the primary concern when air enters a low-pressure system?
A. Oil contamination
B. Increased pressure
C. Reduced efficiency and corrosion
D. Refrigerant freezing
Answer: C. Reduced efficiency and corrosion
Air introduces moisture, which can lead to acid formation and system
damage.
6. What device is used to remove non-condensables from a low-pressure
system?
A. Compressor
B. Purge unit
C. Receiver
D. Accumulator
Answer: B. Purge unit
Purge units remove air and moisture that enter the system.
,7. When should a purge unit be operated?
A. Continuously
B. Only during shutdown
C. Only when pressure rises
D. Occasionally as needed
Answer: D. Occasionally as needed
Excessive purging indicates leaks; operation should be minimized.
8. Excessive purge unit operation indicates:
A. Proper system function
B. High refrigerant levels
C. Air leaks into the system
D. Low oil levels
Answer: C. Air leaks into the system
Frequent purging suggests that air is entering through leaks.
9. What happens when moisture enters a low-pressure system?
A. Freezing occurs
B. Pressure increases
C. Acid formation occurs
D. Refrigerant evaporates faster
Answer: C. Acid formation occurs
Moisture reacts with refrigerant and oil, forming acids that damage
components.
10.What must be done before opening a low-pressure system for repairs?
A. Add refrigerant
B. Evacuate refrigerant
C. Increase pressure
D. Shut off power only
Answer: B. Evacuate refrigerant
Refrigerant must be properly removed to avoid release into the
atmosphere.
, 11.What is the required evacuation level for low-pressure systems before
opening?
A. 0 psig
B. 10 inches Hg vacuum
C. 25 inches Hg vacuum
D. 15 psig
Answer: C. 25 inches Hg vacuum
EPA requires deep evacuation to minimize emissions.
12.Why are leaks more common in low-pressure systems?
A. High pressure
B. Vacuum conditions draw air inward
C. Poor design
D. High temperatures
Answer: B. Vacuum conditions draw air inward
Any opening allows air to be pulled into the system.
13.What is the purpose of a rupture disc?
A. Increase pressure
B. Prevent leaks
C. Protect against overpressure
D. Store refrigerant
Answer: C. Protect against overpressure
It relieves pressure to prevent system damage.
14.If a rupture disc bursts, what must be done?
A. Ignore it
B. Replace and check for leaks
C. Add refrigerant
D. Restart system immediately
Answer: B. Replace and check for leaks
System integrity must be restored before operation.
