EPA 608 Type 3 Practice Test 2025 (Low-pressure Appliances)

Last Updated on April 21, 2025

EPA 608 Type 3 Practice Test 2025 (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 encompass low-pressure appliance maintenance or disposal, leak detection, leak repair specifications, recovery procedures, and refrigeration. Although these requirements may be similar to Type II, low-pressure 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 the primary purpose of a purge unit on a low-pressure chiller?

A) Monitor system temperature

B) Control refrigerant flow

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.

2 / 40

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

A) Every five years

B) Monthly

C) Annually

D) Biannually

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

3 / 40

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

A) It can form toxic compounds

B) It can cause corrosion

C) It can cause an explosion

D) It can contaminate the refrigerant

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

4 / 40

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

A) The cylinder may explode

B) The pressure will increase

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.

5 / 40

5) 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) Air and moisture enter through the purge unit.

C) Refrigerant escapes through low pressure leaks.

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.

6 / 40

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

A) Replace the disc and continue pressurizing

B) Increase the pressure gradually

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.

7 / 40

7) 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.

8 / 40

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

A) Inspect with a bore scope

B) Remove tubes and place in a tube tester

C) Use a flashlight to expose pinholes

D) Hydrostatic tube test kit

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

9 / 40

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

A) The rupture disc will fail

B) Oxygen combined with oil in the system will explode

C) Shaft seals will fail

D) None of the above

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

10 / 40

10) 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.

11 / 40

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

A) 10 psia

B) 5 psig

C) 15 psig

D) 15 psia

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

12 / 40

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

A) It can cause corrosion

B) It can contaminate the refrigerant

C) It can cause an explosion

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.

13 / 40

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

A) None of the above

B) a and b

C) Recover remaining vapor second.

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.

14 / 40

14) 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.

15 / 40

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

A) Gaskets or fittings

B) Evaporator

C) Condenser

D) Purge unit

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

16 / 40

16) 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.

17 / 40

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

A) 5 psig

B) 10 psia

C) 15 psia

D) 15 psig

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

18 / 40

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

A) Manifold gauge

B) Compound gauge

C) Digital gauge

D) Pressure gauge

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

19 / 40

19) 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) None of the above

C) a and b

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%.

20 / 40

20) 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.

21 / 40

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

A) a and b

B) Recover remaining vapor second.

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.

22 / 40

22) 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) Hydrostatic tube test kit

D) Inspect with a bore scope

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

23 / 40

23) 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 controlled hot water or heater blankets

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

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

24 / 40

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

C) Heat the recovery tank

D) Use two recovery machines

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

25 / 40

25) 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.

26 / 40

26) 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.

27 / 40

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

A) The system water pumps

B) The recovery compressor

C) All the above

D) The recovery condenser water

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

28 / 40

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

A) 10 inches Hg

B) 500 microns

C) 25 mm Hg absolute

D) 0 inches Hg

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

29 / 40

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

A) Testing for leaks in water tubes

B) Checking refrigerant levels

C) Measuring pressure drops

D) Monitoring refrigerant flow

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

30 / 40

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

A) Municipal water supply

B) Deep well

C) Chiller

D) Evaporator

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

31 / 40

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

A) None of the above

B) Vent the refrigerant to the atmosphere

C) Pressurize the system with an inert gas

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.

32 / 40

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

A) Reduce the evacuation pressure

B) Increase the evacuation rate

C) Circulate warm water through the chiller

D) Use a larger vacuum pump

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

33 / 40

33) 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%.

34 / 40

34) 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) 10 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.

35 / 40

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

A) During pressure checks

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

C) There are specific recommendations.

D) Leak check every year

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.

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) 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.

38 / 40

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

A) Shaft seal

B) Condenser

C) Evaporator

D) Cooling tower

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

39 / 40

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

A) Ventilate the area thoroughly

B) Use appropriate personal protective equipment (PPE)

C) Avoid direct contact with refrigerants

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.

40 / 40

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

A) The cylinder may explode

B) The pressure will increase

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.

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