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

Last Updated on February 9, 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 is a hydrostatic tube test kit used for?

A) Checking refrigerant levels

B) Measuring pressure drops

C) Testing for leaks in water tubes

D) Monitoring refrigerant flow

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

2 / 40

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

A) Evaporator

B) Deep well

C) Chiller

D) Municipal water supply

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

3 / 40

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

A) Refrigerant leaks out through shaft seals and gaskets.

B) Air and moisture enter through the purge unit.

C) Refrigerant escapes through low pressure leaks.

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

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

4 / 40

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

A) Cooling tower

B) Evaporator

C) Condenser

D) Shaft seal

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

5 / 40

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

A) 15 psia

B) 15 psig

C) 5 psig

D) 10 psia

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

6 / 40

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

A) It can contaminate the refrigerant

B) It can cause corrosion

C) It can form toxic compounds

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.

7 / 40

7) 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.

8 / 40

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

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

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

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

D) 100 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.

9 / 40

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

A) Use two recovery machines

B) Heat the recovery tank

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

D) Recover on a hot day

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

10 / 40

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

A) Use a larger vacuum pump

B) Circulate warm water through the chiller

C) Increase the evacuation rate

D) Reduce the evacuation pressure

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

11 / 40

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

A) None of the above

B) Shaft seals will fail

C) The rupture disc will fail

D) Oxygen combined with oil in the system will explode

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

12 / 40

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

A) Pressurize the system with an inert gas

B) None of the above

C) Vent the refrigerant to the atmosphere

D) Evacuate the system to 0 psig

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

13 / 40

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

A) Control refrigerant flow

B) Monitor system temperature

C) Remove non-condensables from the system

D) Increase system pressure

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

14 / 40

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

A) Annually

B) Biannually

C) Every five years

D) Monthly

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

15 / 40

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

A) It can form toxic compounds

B) It can contaminate the refrigerant

C) It can cause an explosion

D) It can cause corrosion

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

16 / 40

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

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

B) Heat the recovery tank

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

D) Use two recovery machines

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

17 / 40

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

A) Avoid direct contact with refrigerants

B) Ventilate the area thoroughly

C) Use appropriate personal protective equipment (PPE)

D) All of the above

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.

18 / 40

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

A) Hydrostatic tube test kit

B) Inspect with a bore scope

C) Use a flashlight to expose pinholes

D) Remove tubes and place in a tube tester

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

19 / 40

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

A) 25 mm Hg absolute

B) 500 microns

C) 0 inches Hg

D) 10 inches Hg

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

20 / 40

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

A) Evaporator

B) Deep well

C) Municipal water supply

D) Chiller

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

21 / 40

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

A) The cylinder may explode

B) All of the above

C) The refrigerant will expand

D) The pressure will increase

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

22 / 40

22) How should a water box be leak tested?

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

B) Look for bubbles in the water

C) Test the water for traces of refrigerant

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.

23 / 40

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

A) Recover remaining vapor second.

B) a and b

C) Remove the liquid first.

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.

24 / 40

24) 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.

25 / 40

25) How should a water box be leak tested?

A) Test the water for traces of refrigerant

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

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

D) Look for bubbles in the water

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

26 / 40

26) 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) None of the above

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

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

27 / 40

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

A) During pressure checks

B) Leak check every year

C) There are specific recommendations.

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.

28 / 40

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

A) 10 psia

B) 5 psig

C) 15 psia

D) 15 psig

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

29 / 40

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

A) The refrigerant will expand

B) The pressure will increase

C) All of the above

D) The cylinder may explode

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

30 / 40

30) 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) All the above

D) The recovery compressor

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

31 / 40

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

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

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

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

D) 50 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.

32 / 40

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

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

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

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

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

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

33 / 40

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

A) Hydrostatic tube test kit

B) Inspect with a bore scope

C) Use a flashlight to expose pinholes

D) Remove tubes and place in a tube tester

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

34 / 40

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

A) All the above

B) The system water pumps

C) The recovery compressor

D) The recovery condenser water

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

35 / 40

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

A) Compound gauge

B) Pressure gauge

C) Digital gauge

D) Manifold gauge

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

36 / 40

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

A) Testing for leaks in water tubes

B) Checking refrigerant levels

C) Monitoring refrigerant flow

D) Measuring pressure drops

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

37 / 40

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

A) Circulate warm water through the chiller

B) Reduce the evacuation pressure

C) Increase the evacuation rate

D) Use a larger vacuum pump

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

38 / 40

38) 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) None of the above

C) a and b

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

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

39 / 40

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

A) Gaskets or fittings

B) Purge unit

C) Condenser

D) Evaporator

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

40 / 40

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

A) Increase the pressure gradually

B) Replace the disc and continue pressurizing

C) Reduce the pressure and monitor the system

D) Evacuate the system immediately and replace the disc

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

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