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EPA Section 608 Certification Practice Test 2026: Practice test 3

Practice test 3 of 3 for the EPA Section 608 Certification Practice Test: 25 more questions with answers and explanations.

  • Certification exams
  • United States
  • 75 questions
  • Checked
  • Edited by A. Singh
  • Fact-checked October 23, 2026
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  1. Question 1 of 25

    Recovery equipment made after November 15, 1993 is used on a medium-pressure appliance with 200 pounds or more. What level is required?
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    Answer: B. 15 inches of Hg vacuum

    Table 1 requires 15 inches of Hg vacuum for medium-pressure appliances of 200 pounds or more with recovery equipment made on or after November 15, 1993.

  2. Question 2 of 25

    Before a non-major repair on a high-pressure appliance, what is the highest pressure allowed when the system is opened?
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    Answer: A. 0 psig

    For non-major repairs not followed by evacuation to the environment, medium-, high- and very high-pressure appliances must be brought to no higher than 0 psig.

  3. Question 3 of 25

    Which job counts as "major" maintenance, service or repair?
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    Answer: A. Removing the compressor, condenser, evaporator or auxiliary heat exchanger coil

    EPA defines major maintenance, service or repair as work that involves removing the compressor, condenser, evaporator or auxiliary heat exchanger coil.

  4. Question 4 of 25

    System-dependent recovery equipment may not be used on appliances with a full charge above what amount, unless it is a permanently attached pump-out unit?
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    Answer: D. 15 pounds

    Section 82.156 limits system-dependent recovery equipment to appliances with a full charge of 15 pounds or less, unless it is a permanent pump-out unit.

  5. Question 5 of 25

    The Section 608 leak repair rules apply to appliances with a full charge of how much ozone-depleting refrigerant?
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    Answer: D. 50 pounds or more

    Section 82.157 applies to appliances with a full charge of 50 or more pounds of class I or class II refrigerant, or a blend containing one.

  6. Question 6 of 25

    What is the leak rate that triggers repair for commercial refrigeration under Section 608?
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    Answer: C. 20 percent

    The trigger leak rate for commercial refrigeration, such as supermarket and cold storage systems, is 20 percent over a 12-month period.

  7. Question 7 of 25

    Once a leak rate is over the trigger, how long does the owner usually have to repair the leak?
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    Answer: C. 30 days

    Owners must repair leaks within 30 days, or 120 days when an industrial process shutdown is needed to make the repair.

  8. Question 8 of 25

    After a successful initial verification test of a leak repair, when must the follow-up verification test be done?
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    Answer: C. Within 10 days

    Section 82.157 requires both an initial and a follow-up verification test, and the follow-up test is due within 10 days of a successful initial test.

  9. Question 9 of 25

    A commercial refrigeration system with 500 pounds or more exceeds its trigger rate. How often must leak inspections be done afterward?
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    Answer: A. Quarterly, until four quarters in a row are below the trigger rate

    Commercial and industrial process systems with 500 or more pounds need quarterly leak inspections until four consecutive quarters show leaks below the trigger rate.

  10. Question 10 of 25

    Which certification covers servicing or disposing of low-pressure appliances?
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    Answer: A. Type III

    EPA says Type III certification is for servicing or disposing of low-pressure appliances, such as many centrifugal chillers.

  11. Question 11 of 25

    Which refrigerant is listed as a low-pressure refrigerant?
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    Answer: C. R-123

    Section 82.152 lists R-11, R-123, R-113 and R-245fa as examples of refrigerants used in low-pressure appliances.

  12. Question 12 of 25

    How does the rule define a low-pressure appliance?
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    Answer: C. Its refrigerant has a saturation pressure below 45 psia at 104 degrees F

    Section 82.152 defines a low-pressure appliance as one using a refrigerant with a liquid phase saturation pressure below 45 psia at 104 degrees F.

  13. Question 13 of 25

    What evacuation level is required before opening a low-pressure appliance for a major repair or disposal?
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    Answer: B. 25 mm Hg absolute

    Table 1 of section 82.156 requires low-pressure appliances to be evacuated to 25 mm Hg absolute, whatever the age of the recovery equipment.

  14. Question 14 of 25

    For a non-major repair on a low-pressure appliance, what pressure must it be at when opened?
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    Answer: B. No higher than 0 psig

    Section 82.156 says low-pressure appliances must be pressurized to no higher than 0 psig before opening for a non-major repair.

  15. Question 15 of 25

    A low-pressure refrigerant boils above 85 degrees F. How should pressure be raised for a non-major repair?
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    Answer: D. Use heat first, then nitrogen may bring it up to atmospheric pressure

    For refrigerants that boil above 85 degrees F, the rule calls for heat to raise internal pressure first, then nitrogen may be used to reach atmospheric pressure.

  16. Question 16 of 25

    A low-pressure refrigerant boils at or below 85 degrees F. What should NOT be used to raise the pressure for a non-major repair?
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    Answer: D. Nitrogen or other methods that need purging afterward

    For refrigerants that boil at or below 85 degrees F, section 82.156 says not to use nitrogen or similar methods that would need to be purged later.

  17. Question 17 of 25

    Which systems does the rule call "comfort cooling"?
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    Answer: A. Air conditioning that cools occupied buildings, such as chillers and rooftop units

    Section 82.152 defines comfort cooling as air-conditioning appliances that cool occupied facilities, including chillers, split systems and rooftop units.

  18. Question 18 of 25

    What is the trigger leak rate for a comfort cooling chiller with 50 pounds or more of ozone-depleting refrigerant?
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    Answer: A. 10 percent

    Section 82.157 sets a 10 percent trigger leak rate for comfort cooling appliances, the lowest of the three main sectors.

  19. Question 19 of 25

    What is the trigger leak rate for industrial process refrigeration under Section 608?
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    Answer: C. 30 percent

    Industrial process refrigeration, such as chemical plant or ice rink systems, has a 30 percent trigger leak rate over 12 months.

  20. Question 20 of 25

    An appliance leaks 125 percent or more of its full charge in a calendar year. What must the owner do?
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    Answer: B. Report it to EPA by March 1 of the next year

    Section 82.157 treats these as chronic leakers, and the owner must report them to EPA by March 1 of the following year.

  21. Question 21 of 25

    After a comfort cooling appliance exceeds its trigger rate, how often must leak inspections be done?
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    Answer: B. Annually, until one year shows leaks below the trigger rate

    For comfort cooling and other appliances, section 82.157 requires annual leak inspections until one year passes below the trigger rate.

  22. Question 22 of 25

    Why do low-pressure chillers usually have a purge unit?
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    Answer: B. Parts of the system run below atmospheric pressure, so air and moisture can leak in and must be removed

    Low-pressure systems can operate in a vacuum, so air and moisture leak in, and EPA's Type III topics cover the purge unit that removes them.

  23. Question 23 of 25

    When recharging a low-pressure chiller that is in a deep vacuum, what should go in first?
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    Answer: C. Refrigerant vapor, then liquid

    EPA's Type III topics say to introduce vapor before liquid, because liquid at very low pressure can boil and freeze the water in the tubes.

  24. Question 24 of 25

    Why might a technician heat the oil in a low-pressure chiller before removing it?
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    Answer: A. To drive refrigerant out of the oil so less refrigerant is lost

    EPA's Type III topics include heating oil before removal, which releases refrigerant dissolved in the oil so it can be recovered.

  25. Question 25 of 25

    EPA's Type III safety topics mention an ASHRAE Standard 15 sensor requirement for which refrigerant?
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    Answer: B. R-123

    EPA's Type III test topics list ASHRAE Standard 15 equipment room rules, including a sensor requirement for R-123.

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