EPA 608 Type III Test Questions Actual 2026
Newest Updated Questions and Correct
Answers (Latest Update)
(Verified Answers by Expert)
EPA 608 Type III Certification Practice Exam
cx cx cx cx cx cx
1. Which of the following refrigerants is most commonly associated with low-
cx cx cx cx cx cx cx cx cx cx cx
pressure centrifugal chillers? cx cx
A) R-22
cx
B) R-410A
cx
C) R-123
cx
D) R-134a
cx
2. A low-
cx cx
pressure chiller is defined as a system that operates with a refrigerant whose boiling point
cx cx cx cx cx cx cx cx cx cx cx cx cx cx c
is below atmospheric pressure at standard conditions. What is the primary safety concern
x cx cx cx cx cx cx cx cx cx cx cx cx cx
associated with this? cx cx
A) The refrigerant is highly flammable.
cx cx cx cx cx
B) The refrigerant is highly toxic.
cx cx cx cx cx
C) A leak can cause the system to go into a vacuum, drawing in air and moisture.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
D) The refrigerant will immediately combust if exposed to open flame.
cx cx cx cx cx cx cx cx cx cx
3. What is the typical operating pressure range for the evaporator of an R-123 low-
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
pressure chiller? cx
A) 0 to 5 psig
cx cx cx cx
B) 15 to 20 psig
cx cx cx cx
C) 100 to 125 psig
cx cx cx cx
D) 250 to 300 psig
cx cx cx cx
4. Why is a purge unit essential for the proper operation of a low-pressure chiller?
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
A) To remove excess oil from the evaporator.
cx cx cx cx cx cx cx
B) To remove non-condensable gases (like air) that enter the system.
cx cx cx cx cx cx cx cx cx cx
C) To maintain the correct refrigerant charge level.
cx cx cx cx cx cx cx
D) To increase the system's cooling capacity.
cx cx cx cx cx cx
5. If a low-
cx cx cx
pressure chiller is suspected of being contaminated with air, what is the most noticeable s
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
ymptom?
A) The compressor will draw excessive current.
cx cx cx cx cx cx
B) The discharge pressure will be abnormally high for the ambient temperature.
cx cx cx cx cx cx cx cx cx cx cx
,C) The evaporator will freeze up.
cx cx cx cx cx
D) The expansion valve will make a loud hissing noise.
cx cx cx cx cx cx cx cx cx
6. To prevent moisture from entering a low-
cx cx cx cx cx cx cx
pressure chiller that is being repaired, what is the critical procedure?
cx cx cx cx cx cx cx cx cx cx
A) Keep the system charged with nitrogen at all times.
cx cx cx cx cx cx cx cx cx
B) Heat the compressor to drive out any moisture.
cx cx cx cx cx cx cx cx
C) Keep the system either running or pressurized with dry nitrogen, and use a vacuum pump to e
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
vacuate it. cx
D) Only perform repairs when the ambient temperature is below 50°F.
cx cx cx cx cx cx cx cx cx cx
7. What is the maximum allowable factory charge of refrigerant for a standard "leak repai
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
r" requirement under Section 608?
cx cx cx cx
A) 15 pounds
cx cx
B) 50 pounds
cx cx
C) 100 pounds
cx cx
D) 200 pounds
cx cx
8. Under EPA regulations, when must repairs to a leak in an appliance with a 50-
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
pound charge or more be completed?
cx cx cx cx cx
A) Within 10 days of the leak being discovered.
cx cx cx cx cx cx cx cx
B) Within 30 days of the leak being discovered.
cx cx cx cx cx cx cx cx
C) Within 90 days of the leak being discovered.
cx cx cx cx cx cx cx cx
D) Within 1 year of the leak being discovered.
cx cx cx cx cx cx cx cx
9. Which of the following is an approved method for leak checking a low-pressure chiller?
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
A) Using a halide torch.
cx cx cx cx
B) Using an electronic or ultrasonic leak detector.
cx cx cx cx cx cx cx
C) Adding a fluorescent dye to the oil.
cx cx cx cx cx cx cx
D) Soaping all fittings while the system is in a vacuum.
cx cx cx cx cx cx cx cx cx cx
10. When transferring refrigerant from a low-
cx cx cx cx cx cx
pressure chiller into a recovery cylinder, what is a crucial safety step?
cx cx cx cx cx cx cx cx cx cx cx
A) Use a standard recovery cylinder rated for 400 PSIG.
cx cx cx cx cx cx cx cx cx
B) Ensure the recovery cylinder is rated for the low pressure of the refrigerant (e.g., 15 PSIG for R-
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
123) and is not overfilled.
cx cx cx cx
C) Heat the recovery cylinder to drive the refrigerant into the chiller.
cx cx cx cx cx cx cx cx cx cx cx
D) Never use a recovery machine; only use the chiller's own compressor.
cx cx cx cx cx cx cx cx cx cx cx
11. The EPA prohibits the use of CFC and HCFC refrigerants as a "top-
cx cx cx cx cx cx cx cx cx cx cx cx cx
off" fluid. What does this mean?
cx cx cx cx cx
A) You cannot add refrigerant to a system without first finding and repairing the leak.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
B) You cannot use refrigerant to pressure-test a system.
cx cx cx cx cx cx cx cx
, C) You cannot use refrigerant to clean the system tubing.
cx cx cx cx cx cx cx cx cx
D) You cannot top off the oil charge.
cx cx cx cx cx cx cx
12. What is the primary purpose of an oil separator in a low-pressure chiller?
cx cx cx cx cx cx cx cx cx cx cx cx cx
A) To remove acid from the oil.
cx cx cx cx cx cx
B) To prevent oil from migrating into the evaporator, where it can cause efficiency loss.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
C) To separate refrigerant from the oil for reclaiming.
cx cx cx cx cx cx cx cx
D) To filter out particulate matter.
cx cx cx cx cx
13. A technician arrives at a chiller and finds the rupture disc has burst. What does this ind
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
icate?
A) The system was overcharged with refrigerant.
cx cx cx cx cx cx
B) The refrigerant pressure in the vessel exceeded its safe design limit.
cx cx cx cx cx cx cx cx cx cx cx
C) The water flow to the condenser has stopped.
cx cx cx cx cx cx cx cx
D) The purge unit is not working correctly.
cx cx cx cx cx cx cx
14. After servicing a low-
cx cx cx cx
pressure chiller, what is the maximum allowable moisture level (in ppm) for R-
cx cx cx cx cx cx cx cx cx cx cx cx
123 before you put the system back online?
cx cx cx cx cx cx cx
A) 10 ppm
cx cx
B) 25 ppm
cx cx
C) 100 ppm
cx cx
D) 500 ppm
cx cx
15. What is the recommended procedure for recovering refrigerant from a low-
cx cx cx cx cx cx cx cx cx cx cx
pressure chiller that is still under pressure?
cx cx cx cx cx cx
A) Use a liquid pump to pull liquid from the bottom of the chiller.
cx cx cx cx cx cx cx cx cx cx cx cx cx
B) Use a gas pump to pull vapor from the top of the chiller.
cx cx cx cx cx cx cx cx cx cx cx cx cx
C) Use the chiller's compressor to pump the refrigerant into a recovery cylinder.
cx cx cx cx cx cx cx cx cx cx cx cx
D) Run the system and use a recovery machine on the discharge side.
cx cx cx cx cx cx cx cx cx cx cx cx
16. If you are using a system-
cx cx cx cx cx cx
dependent (passive) recovery device on a small appliance, what is the maximum pressure
cx cx cx cx cx cx cx cx cx cx cx cx cx
the compressor must be able to achieve for recovery?
cx cx cx cx cx cx cx cx
A) 0 psig
cx cx
B) 4 psig
cx cx
C) 15 psig
cx cx
D) 30 psig
cx cx
17. Why are low-pressure chillers more susceptible to moisture contamination than high-
cx cx cx cx cx cx cx cx cx cx cx
pressure systems? cx
A) They use a different type of oil that absorbs moisture.
cx cx cx cx cx cx cx cx cx cx
B) The lower operating pressure can draw air and moisture into the system through leaks.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
Newest Updated Questions and Correct
Answers (Latest Update)
(Verified Answers by Expert)
EPA 608 Type III Certification Practice Exam
cx cx cx cx cx cx
1. Which of the following refrigerants is most commonly associated with low-
cx cx cx cx cx cx cx cx cx cx cx
pressure centrifugal chillers? cx cx
A) R-22
cx
B) R-410A
cx
C) R-123
cx
D) R-134a
cx
2. A low-
cx cx
pressure chiller is defined as a system that operates with a refrigerant whose boiling point
cx cx cx cx cx cx cx cx cx cx cx cx cx cx c
is below atmospheric pressure at standard conditions. What is the primary safety concern
x cx cx cx cx cx cx cx cx cx cx cx cx cx
associated with this? cx cx
A) The refrigerant is highly flammable.
cx cx cx cx cx
B) The refrigerant is highly toxic.
cx cx cx cx cx
C) A leak can cause the system to go into a vacuum, drawing in air and moisture.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
D) The refrigerant will immediately combust if exposed to open flame.
cx cx cx cx cx cx cx cx cx cx
3. What is the typical operating pressure range for the evaporator of an R-123 low-
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
pressure chiller? cx
A) 0 to 5 psig
cx cx cx cx
B) 15 to 20 psig
cx cx cx cx
C) 100 to 125 psig
cx cx cx cx
D) 250 to 300 psig
cx cx cx cx
4. Why is a purge unit essential for the proper operation of a low-pressure chiller?
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
A) To remove excess oil from the evaporator.
cx cx cx cx cx cx cx
B) To remove non-condensable gases (like air) that enter the system.
cx cx cx cx cx cx cx cx cx cx
C) To maintain the correct refrigerant charge level.
cx cx cx cx cx cx cx
D) To increase the system's cooling capacity.
cx cx cx cx cx cx
5. If a low-
cx cx cx
pressure chiller is suspected of being contaminated with air, what is the most noticeable s
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
ymptom?
A) The compressor will draw excessive current.
cx cx cx cx cx cx
B) The discharge pressure will be abnormally high for the ambient temperature.
cx cx cx cx cx cx cx cx cx cx cx
,C) The evaporator will freeze up.
cx cx cx cx cx
D) The expansion valve will make a loud hissing noise.
cx cx cx cx cx cx cx cx cx
6. To prevent moisture from entering a low-
cx cx cx cx cx cx cx
pressure chiller that is being repaired, what is the critical procedure?
cx cx cx cx cx cx cx cx cx cx
A) Keep the system charged with nitrogen at all times.
cx cx cx cx cx cx cx cx cx
B) Heat the compressor to drive out any moisture.
cx cx cx cx cx cx cx cx
C) Keep the system either running or pressurized with dry nitrogen, and use a vacuum pump to e
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
vacuate it. cx
D) Only perform repairs when the ambient temperature is below 50°F.
cx cx cx cx cx cx cx cx cx cx
7. What is the maximum allowable factory charge of refrigerant for a standard "leak repai
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
r" requirement under Section 608?
cx cx cx cx
A) 15 pounds
cx cx
B) 50 pounds
cx cx
C) 100 pounds
cx cx
D) 200 pounds
cx cx
8. Under EPA regulations, when must repairs to a leak in an appliance with a 50-
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
pound charge or more be completed?
cx cx cx cx cx
A) Within 10 days of the leak being discovered.
cx cx cx cx cx cx cx cx
B) Within 30 days of the leak being discovered.
cx cx cx cx cx cx cx cx
C) Within 90 days of the leak being discovered.
cx cx cx cx cx cx cx cx
D) Within 1 year of the leak being discovered.
cx cx cx cx cx cx cx cx
9. Which of the following is an approved method for leak checking a low-pressure chiller?
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
A) Using a halide torch.
cx cx cx cx
B) Using an electronic or ultrasonic leak detector.
cx cx cx cx cx cx cx
C) Adding a fluorescent dye to the oil.
cx cx cx cx cx cx cx
D) Soaping all fittings while the system is in a vacuum.
cx cx cx cx cx cx cx cx cx cx
10. When transferring refrigerant from a low-
cx cx cx cx cx cx
pressure chiller into a recovery cylinder, what is a crucial safety step?
cx cx cx cx cx cx cx cx cx cx cx
A) Use a standard recovery cylinder rated for 400 PSIG.
cx cx cx cx cx cx cx cx cx
B) Ensure the recovery cylinder is rated for the low pressure of the refrigerant (e.g., 15 PSIG for R-
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
123) and is not overfilled.
cx cx cx cx
C) Heat the recovery cylinder to drive the refrigerant into the chiller.
cx cx cx cx cx cx cx cx cx cx cx
D) Never use a recovery machine; only use the chiller's own compressor.
cx cx cx cx cx cx cx cx cx cx cx
11. The EPA prohibits the use of CFC and HCFC refrigerants as a "top-
cx cx cx cx cx cx cx cx cx cx cx cx cx
off" fluid. What does this mean?
cx cx cx cx cx
A) You cannot add refrigerant to a system without first finding and repairing the leak.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
B) You cannot use refrigerant to pressure-test a system.
cx cx cx cx cx cx cx cx
, C) You cannot use refrigerant to clean the system tubing.
cx cx cx cx cx cx cx cx cx
D) You cannot top off the oil charge.
cx cx cx cx cx cx cx
12. What is the primary purpose of an oil separator in a low-pressure chiller?
cx cx cx cx cx cx cx cx cx cx cx cx cx
A) To remove acid from the oil.
cx cx cx cx cx cx
B) To prevent oil from migrating into the evaporator, where it can cause efficiency loss.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
C) To separate refrigerant from the oil for reclaiming.
cx cx cx cx cx cx cx cx
D) To filter out particulate matter.
cx cx cx cx cx
13. A technician arrives at a chiller and finds the rupture disc has burst. What does this ind
cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx cx
icate?
A) The system was overcharged with refrigerant.
cx cx cx cx cx cx
B) The refrigerant pressure in the vessel exceeded its safe design limit.
cx cx cx cx cx cx cx cx cx cx cx
C) The water flow to the condenser has stopped.
cx cx cx cx cx cx cx cx
D) The purge unit is not working correctly.
cx cx cx cx cx cx cx
14. After servicing a low-
cx cx cx cx
pressure chiller, what is the maximum allowable moisture level (in ppm) for R-
cx cx cx cx cx cx cx cx cx cx cx cx
123 before you put the system back online?
cx cx cx cx cx cx cx
A) 10 ppm
cx cx
B) 25 ppm
cx cx
C) 100 ppm
cx cx
D) 500 ppm
cx cx
15. What is the recommended procedure for recovering refrigerant from a low-
cx cx cx cx cx cx cx cx cx cx cx
pressure chiller that is still under pressure?
cx cx cx cx cx cx
A) Use a liquid pump to pull liquid from the bottom of the chiller.
cx cx cx cx cx cx cx cx cx cx cx cx cx
B) Use a gas pump to pull vapor from the top of the chiller.
cx cx cx cx cx cx cx cx cx cx cx cx cx
C) Use the chiller's compressor to pump the refrigerant into a recovery cylinder.
cx cx cx cx cx cx cx cx cx cx cx cx
D) Run the system and use a recovery machine on the discharge side.
cx cx cx cx cx cx cx cx cx cx cx cx
16. If you are using a system-
cx cx cx cx cx cx
dependent (passive) recovery device on a small appliance, what is the maximum pressure
cx cx cx cx cx cx cx cx cx cx cx cx cx
the compressor must be able to achieve for recovery?
cx cx cx cx cx cx cx cx
A) 0 psig
cx cx
B) 4 psig
cx cx
C) 15 psig
cx cx
D) 30 psig
cx cx
17. Why are low-pressure chillers more susceptible to moisture contamination than high-
cx cx cx cx cx cx cx cx cx cx cx
pressure systems? cx
A) They use a different type of oil that absorbs moisture.
cx cx cx cx cx cx cx cx cx cx
B) The lower operating pressure can draw air and moisture into the system through leaks.
cx cx cx cx cx cx cx cx cx cx cx cx cx cx
