EPA 608 Type 3 Practice Test 2026 (Low-pressure Appliances)

Last Updated on October 2, 2026

EPA 608 Type 3 Practice Test 2026 (Low-pressure Appliances) certification exam questions and answers. You can prepare for the EPA 608 Section Type III Certification Exam on our website for free.

The Type III EPA certification will cover low-pressure appliance maintenance or disposal, leak detection and repair specifications, recovery procedures, and refrigeration. Although these requirements may be similar to those for Type II low-pressure systems, these systems are designed very differently. Learning with this interactive Type III exam preparation course will teach you more about these variations (and the following subjects).

You’ll also need to be familiar with the following for the exam:

Evidence of leaks
Centrifugal chillers’ max leak test pressure
What to look for and how to fix leaks in these systems
Evacuation necessities
Understanding the definition of a “major repair”
ASRAE Standard 15 specifications

EPA 608 Type 3 Practice Test (Low-pressure Appliances)

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EPA 608 Type 3 Low-pressure Appliances

1 / 40

1) What can happen if you heat a refrigerant cylinder?

A) All of the above

B) The refrigerant will expand

C) The pressure will increase

D) The cylinder may explode

Heating a refrigerant cylinder can cause the refrigerant to expand, increase pressure, and potentially lead to an explosion.

2 / 40

2) What needs to be done to leak check a low pressure system?

A) Increase the pressure in the system by the use of oxygen

B) Increase the pressure in the system by the use of boiler hot water

C) Increase the pressure in the system by the use of nitrogen

D) Increase the pressure in the system by the use of controlled hot water or heater blankets

Increasing the pressure in the system using controlled hot water or heater blankets is necessary to leak check a low-pressure system.

3 / 40

3) What is a hydrostatic tube test kit used for?

A) Checking refrigerant levels

B) Monitoring refrigerant flow

C) Testing for leaks in water tubes

D) Measuring pressure drops

A hydrostatic tube test kit is used to test for leaks in water tubes.

4 / 40

4) What equipment should be used to test a tube?

A) Use a flashlight to expose pinholes

B) Hydrostatic tube test kit

C) Remove tubes and place in a tube tester

D) Inspect with a bore scope

A hydrostatic tube test kit should be used to test a tube for leaks.

5 / 40

5) What is a hydrostatic tube test kit used for?

A) Monitoring refrigerant flow

B) Checking refrigerant levels

C) Testing for leaks in water tubes

D) Measuring pressure drops

A hydrostatic tube test kit is used to test for leaks in water tubes.

6 / 40

6) What must be done before opening or removing any parts of a low-pressure system?

A) Vent the refrigerant to the atmosphere

B) Pressurize the system with an inert gas

C) Evacuate the system to 0 psig

D) None of the above

Pressurizing the system with an inert gas is necessary before opening or removing any parts of a low-pressure system.

7 / 40

7) How should a technician recover refrigerant from a system using R-11 or R-123?

A) a and b

B) None of the above

C) Remove the liquid first.

D) Recover remaining vapor second.

To recover refrigerant from a system using R-11 or R-123, the technician should remove the liquid first and then recover the remaining vapor.

8 / 40

8) How should a water box be leak tested?

A) Test the water for traces of refrigerant

B) Look for bubbles in the water

C) Remove water, pressurize and check with a gas detector

D) Remove water, then place the leak detector probe in through the drain valve

To leak test a water box, remove the water, pressurize it, and check with a gas detector.

9 / 40

9) Where do leaks commonly occur in open-drive type compressor systems?

A) Condenser

B) Shaft seal

C) Cooling tower

D) Evaporator

Leaks commonly occur at the shaft seal in open-drive type compressor systems.

10 / 40

10) What is the required evacuation level for a low-pressure appliance before disposing of it?

A) 0 inches Hg

B) 10 inches Hg

C) 500 microns

D) 25 mm Hg absolute

The required evacuation level for a low-pressure appliance before disposal is 25 mm Hg absolute.

11 / 40

11) After removal of liquid, about how much vapor will remain in the system on a 350 ton R-11 chiller?

A) 100 lbs of vapor after all the liquid has been removed

B) 10 lbs of vapor after all the liquid has been removed

C) 50 lbs of vapor after all the liquid has been removed

D) 20 lbs of vapor after all the liquid has been removed

Approximately 100 lbs of vapor will remain in the system of a 350 ton R-11 chiller after all the liquid has been removed.

12 / 40

12) Why should oxygen or compressed air never be used to pressurize a system?

A) It can contaminate the refrigerant

B) It can form toxic compounds

C) It can cause corrosion

D) It can cause an explosion

Using oxygen or compressed air to pressurize a system can cause an explosion due to the high reactivity of oxygen with refrigerants.

13 / 40

13) How should a water box be leak tested?

A) Test the water for traces of refrigerant

B) Remove water, then place the leak detector probe in through the drain valve

C) Look for bubbles in the water

D) Remove water, pressurize and check with a gas detector

To leak test a water box, remove the water, pressurize it, and check with a gas detector.

14 / 40

14) How should a technician recover refrigerant from a system using R-11 or R-123?

A) Remove the liquid first.

B) Recover remaining vapor second.

C) a and b

D) None of the above

To recover refrigerant from a system using R-11 or R-123, the technician should remove the liquid first and then recover the remaining vapor.

15 / 40

15) What is the primary purpose of a purge unit on a low-pressure chiller?

A) Remove non-condensables from the system

B) Control refrigerant flow

C) Increase system pressure

D) Monitor system temperature

The primary purpose of a purge unit on a low-pressure chiller is to remove non-condensables from the system.

16 / 40

16) What must be done before opening or removing any parts of a low-pressure system?

A) Evacuate the system to 0 psig

B) None of the above

C) Pressurize the system with an inert gas

D) Vent the refrigerant to the atmosphere

Pressurizing the system with an inert gas is necessary before opening or removing any parts of a low-pressure system.

17 / 40

17) In a system using a water cooled condenser, what components should be kept on?

A) The recovery compressor

B) All the above

C) The recovery condenser water

D) The system water pumps

All listed components should be kept on in a system using a water-cooled condenser.

18 / 40

18) What should be done if a rupture disc fails during pressurization?

A) Evacuate the system immediately and replace the disc

B) Reduce the pressure and monitor the system

C) Increase the pressure gradually

D) Replace the disc and continue pressurizing

If a rupture disc fails during pressurization, the system should be evacuated immediately, and the disc should be replaced.

19 / 40

19) What are the typical pressure settings for rupture discs on low pressure systems and recovery equipment?

A) 5 psig

B) 10 psia

C) 15 psig

D) 15 psia

The typical pressure setting for rupture discs on low-pressure systems and recovery equipment is 5 psig.

20 / 40

20) What should be done to prevent freezing during the evacuation of a low-pressure chiller?

A) Reduce the evacuation pressure

B) Circulate warm water through the chiller

C) Use a larger vacuum pump

D) Increase the evacuation rate

Circulating warm water through the chiller helps to prevent freezing during evacuation.

21 / 40

21) Why should oxygen or compressed air never be used to pressurize a system?

A) It can cause corrosion

B) It can cause an explosion

C) It can contaminate the refrigerant

D) It can form toxic compounds

Using oxygen or compressed air to pressurize a system can cause an explosion due to the high reactivity of oxygen with refrigerants.

22 / 40

22) What should be done to prevent freezing during the evacuation of a low-pressure chiller?

A) Reduce the evacuation pressure

B) Use a larger vacuum pump

C) Increase the evacuation rate

D) Circulate warm water through the chiller

Circulating warm water through the chiller helps to prevent freezing during evacuation.

23 / 40

23) What type of gauge is used to measure the vacuum level in a low-pressure system?

A) Digital gauge

B) Manifold gauge

C) Compound gauge

D) Pressure gauge

A compound gauge is used to measure the vacuum level in a low-pressure system.

24 / 40

24) When should a low pressure system be leak checked according to ASHRAE guideline 3-1996?

A) There are specific recommendations.

B) Leak check every year

C) During pressure checks

D) When the system rises from 1 mm Hg to a level above 2.5 mm Hg during vacuum testing

A low-pressure system should be leak-checked when the system pressure rises from 1 mm Hg to above 2.5 mm Hg during vacuum testing.

25 / 40

25) What are the leak repair requirements for comfort cooling appliances and commercial appliances containing 50 lbs. or more of refrigerant?

A) Repair if leak rate exceeds 35% in all commercial and industrial process refrigeration

B) a and b

C) Repair if leak rate exceeds 15% in comfort cooling appliances.

D) None of the above

Comfort cooling appliances must be repaired if the leak rate exceeds 15%, and commercial appliances must be repaired if the leak rate exceeds 35%.

26 / 40

26) What equipment should be used to test a tube?

A) Remove tubes and place in a tube tester

B) Use a flashlight to expose pinholes

C) Inspect with a bore scope

D) Hydrostatic tube test kit

A hydrostatic tube test kit should be used to test a tube for leaks.

27 / 40

27) After removal of liquid, about how much vapor will remain in the system on a 350 ton R-11 chiller?

A) 10 lbs of vapor after all the liquid has been removed

B) 50 lbs of vapor after all the liquid has been removed

C) 100 lbs of vapor after all the liquid has been removed

D) 20 lbs of vapor after all the liquid has been removed

Approximately 100 lbs of vapor will remain in the system of a 350 ton R-11 chiller after all the liquid has been removed.

28 / 40

28) How can you speed up the vapor recovery process?

A) Recover on a hot day

B) A heater on the recovery vessel side will help to evacuate the vapor faster.

C) Use two recovery machines

D) Heat the recovery tank

Using a heater on the recovery vessel side helps to evacuate the vapor faster.

29 / 40

29) Where does the water typically come from in a water cooled condensing system?

A) Deep well

B) Municipal water supply

C) Chiller

D) Evaporator

The water typically comes from the municipal water supply in a water-cooled condensing system.

30 / 40

30) What can happen if you exceed 10 psig while pressurizing the system?

A) None of the above

B) Oxygen combined with oil in the system will explode

C) Shaft seals will fail

D) The rupture disc will fail

Exceeding 10 psig while pressurizing the system can cause the rupture disc to fail.

31 / 40

31) What safety measure should be taken when working with low-pressure refrigerants?

A) Avoid direct contact with refrigerants

B) Use appropriate personal protective equipment (PPE)

C) All of the above

D) Ventilate the area thoroughly

When working with low-pressure refrigerants, using appropriate personal protective equipment (PPE), ventilating the area, and avoiding direct contact with refrigerants are all essential safety measures.

32 / 40

32) Where does the water typically come from in a water cooled condensing system?

A) Deep well

B) Municipal water supply

C) Evaporator

D) Chiller

The water typically comes from the municipal water supply in a water-cooled condensing system.

33 / 40

33) What can happen if you heat a refrigerant cylinder?

A) The cylinder may explode

B) The refrigerant will expand

C) All of the above

D) The pressure will increase

Heating a refrigerant cylinder can cause the refrigerant to expand, increase pressure, and potentially lead to an explosion.

34 / 40

34) In a system using a water cooled condenser, what components should be kept on?

A) The recovery condenser water

B) The system water pumps

C) The recovery compressor

D) All the above

All listed components should be kept on in a system using a water-cooled condenser.

35 / 40

35) What are the leak repair requirements for comfort cooling appliances and commercial appliances containing 50 lbs. or more of refrigerant?

A) a and b

B) Repair if leak rate exceeds 15% in comfort cooling appliances.

C) None of the above

D) Repair if leak rate exceeds 35% in all commercial and industrial process refrigeration

Comfort cooling appliances must be repaired if the leak rate exceeds 15%, and commercial appliances must be repaired if the leak rate exceeds 35%.

36 / 40

36) How can you speed up the vapor recovery process?

A) Heat the recovery tank

B) How can you speed up the vapor recovery process?

C) A heater on the recovery vessel side will help to evacuate the vapor faster.

D) Use two recovery machines

Using a heater on the recovery vessel side helps to evacuate the vapor faster.

37 / 40

37) How often should a low-pressure chiller be leak tested according to ASHRAE guidelines?

A) Every five years

B) Annually

C) Monthly

D) Biannually

According to ASHRAE guidelines, a low-pressure chiller should be leak tested annually.

38 / 40

38) Where do leaks commonly occur in low pressure systems?

A) Gaskets or fittings

B) Condenser

C) Purge unit

D) Evaporator

Leaks commonly occur in the gaskets or fittings of low-pressure systems.

39 / 40

39) What are the typical pressure settings for rupture discs on low pressure systems and recovery equipment?

A) 5 psig

B) 15 psia

C) 10 psia

D) 15 psig

The typical pressure setting for rupture discs on low-pressure systems and recovery equipment is 5 psig.

40 / 40

40) Does refrigerant go out of the system in low pressure systems or does air and moisture go in?

A) Air and moisture enter the refrigeration system because it operates in a vacuum

B) Refrigerant escapes through low pressure leaks.

C) Air and moisture enter through the purge unit.

D) Refrigerant leaks out through shaft seals and gaskets.

Air and moisture enter the refrigeration system in low-pressure systems because they operate under a vacuum.

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