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

A) Vent the refrigerant to the atmosphere

B) None of the above

C) Evacuate the system to 0 psig

D) Pressurize the system with an inert gas

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

2 / 40

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

A) Evacuate the system to 0 psig

B) Pressurize the system with an inert gas

C) Vent the refrigerant to the atmosphere

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.

3 / 40

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

A) Use a flashlight to expose pinholes

B) Inspect with a bore scope

C) Remove tubes and place in a tube tester

D) Hydrostatic tube test kit

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

4 / 40

4) 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.

5 / 40

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

A) All the above

B) The recovery compressor

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.

6 / 40

6) 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 the refrigeration system because it operates in a vacuum

C) Refrigerant escapes through low pressure leaks.

D) Air and moisture enter through the purge unit.

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

7 / 40

7) 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.

8 / 40

8) 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 15% in comfort cooling appliances.

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

C) None of the above

D) a and b

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

9 / 40

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

A) The pressure will increase

B) The cylinder may explode

C) The refrigerant will expand

D) All of the above

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

10 / 40

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

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

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

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 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.

11 / 40

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

D) During pressure checks

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.

12 / 40

12) 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.

13 / 40

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

A) The refrigerant will expand

B) All of the above

C) The cylinder may explode

D) The pressure will increase

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

14 / 40

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

A) Recover remaining vapor second.

B) None of the above

C) a and b

D) Remove the liquid first.

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) 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.

16 / 40

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

A) The recovery compressor

B) The recovery condenser water

C) All the above

D) The system water pumps

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

17 / 40

17) 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.

18 / 40

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

A) Increase the evacuation rate

B) Reduce the evacuation pressure

C) Use a larger vacuum pump

D) Circulate warm water through the chiller

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

19 / 40

19) 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 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.

20 / 40

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

A) Testing for leaks in water tubes

B) Measuring pressure drops

C) Checking refrigerant levels

D) Monitoring refrigerant flow

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

21 / 40

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

A) It can form toxic compounds

B) It can cause an explosion

C) It can contaminate the refrigerant

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.

22 / 40

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

A) Monthly

B) Biannually

C) Annually

D) Every five years

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

23 / 40

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

A) Testing for leaks in water tubes

B) Measuring pressure drops

C) Monitoring refrigerant flow

D) Checking refrigerant levels

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

24 / 40

24) 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.

25 / 40

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

A) Condenser

B) Purge unit

C) Evaporator

D) Gaskets or fittings

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

26 / 40

26) 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) Circulate warm water through the chiller

D) Increase the evacuation rate

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

27 / 40

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

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

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

C) 10 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) Where do leaks commonly occur in open-drive type compressor systems?

A) Shaft seal

B) Evaporator

C) Condenser

D) Cooling tower

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

29 / 40

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

A) Recover remaining vapor second.

B) None of the above

C) a and b

D) Remove the liquid first.

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.

30 / 40

30) 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.

31 / 40

31) 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) Use two recovery machines

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

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

32 / 40

32) 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 15% in comfort cooling appliances.

B) a and b

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%.

33 / 40

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

A) Remove non-condensables from the system

B) Increase system pressure

C) Monitor system temperature

D) Control refrigerant flow

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

34 / 40

34) 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.

35 / 40

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

A) Replace the disc and continue pressurizing

B) Evacuate the system immediately and replace the disc

C) Increase the pressure gradually

D) Reduce the pressure and monitor the system

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

36 / 40

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

A) Hydrostatic tube test kit

B) Use a flashlight to expose pinholes

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.

37 / 40

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

A) Oxygen combined with oil in the system will explode

B) Shaft seals will fail

C) The rupture disc will fail

D) None of the above

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

38 / 40

38) How should a water box be leak tested?

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

B) Test the water for traces of refrigerant

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

D) Look for bubbles in the water

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

39 / 40

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

A) All of the above

B) Use appropriate personal protective equipment (PPE)

C) Ventilate the area thoroughly

D) Avoid direct contact with refrigerants

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.

40 / 40

40) How should a water box be leak tested?

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

B) Test the water for traces of refrigerant

C) Look for bubbles in the water

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.

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