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 equipment should be used to test a tube?

A) Remove tubes and place in a tube tester

B) Hydrostatic tube test kit

C) Use a flashlight to expose pinholes

D) Inspect with a bore scope

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

2 / 40

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

A) It can cause an explosion

B) It can cause corrosion

C) It can form toxic compounds

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.

3 / 40

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

A) Vent the refrigerant to the atmosphere

B) Evacuate the system to 0 psig

C) None of the above

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.

4 / 40

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

A) None of the above

B) Recover remaining vapor second.

C) Remove the liquid first.

D) a and b

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.

5 / 40

5) 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 condenser water

D) The recovery compressor

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

6 / 40

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

A) Chiller

B) Deep well

C) Municipal water supply

D) Evaporator

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

7 / 40

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

A) All of the above

B) The refrigerant will expand

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.

8 / 40

8) How should a water box be leak tested?

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

B) Look for bubbles in the water

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

D) Test the water for traces of refrigerant

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

9 / 40

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

A) The rupture disc will fail

B) None of the above

C) Oxygen combined with oil in the system will explode

D) Shaft seals will fail

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

10 / 40

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

A) Heat the recovery tank

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

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.

11 / 40

11) 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) 100 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) What type of gauge is used to measure the vacuum level in a low-pressure system?

A) Manifold gauge

B) Pressure gauge

C) Compound gauge

D) Digital gauge

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

13 / 40

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

A) Remove the liquid first.

B) None of the above

C) Recover remaining vapor second.

D) a and b

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) What can happen if you heat a refrigerant cylinder?

A) The pressure will increase

B) All of the above

C) The refrigerant will expand

D) The cylinder may explode

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

15 / 40

15) 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 controlled hot water or heater blankets

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 nitrogen

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

16 / 40

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

A) Increase the evacuation rate

B) Circulate warm water through the chiller

C) Reduce the evacuation pressure

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) 15 psig

B) 15 psia

C) 10 psia

D) 5 psig

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

18 / 40

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

A) None of the above

B) a and b

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

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%.

19 / 40

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

A) Evaporator

B) Condenser

C) Purge unit

D) Gaskets or fittings

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

20 / 40

20) 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) Evacuate the system to 0 psig

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.

21 / 40

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

A) It can cause corrosion

B) It can form toxic compounds

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.

22 / 40

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

A) Evacuate the system immediately and replace the disc

B) Replace the disc and continue pressurizing

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.

23 / 40

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

A) Monitoring refrigerant flow

B) Measuring pressure drops

C) Testing for leaks in water tubes

D) Checking refrigerant levels

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

24 / 40

24) 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.

25 / 40

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

A) Use a flashlight to expose pinholes

B) Inspect with a bore scope

C) Hydrostatic tube test kit

D) Remove tubes and place in a tube tester

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

26 / 40

26) How should a water box be leak tested?

A) Look for bubbles in the water

B) Test the water for traces of refrigerant

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.

27 / 40

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

A) Control refrigerant flow

B) Increase system pressure

C) Monitor system temperature

D) Remove non-condensables from the system

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

28 / 40

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

A) All of the above

B) Ventilate the area thoroughly

C) Avoid direct contact with refrigerants

D) Use appropriate personal protective equipment (PPE)

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.

29 / 40

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

A) Shaft seal

B) Evaporator

C) Cooling tower

D) Condenser

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

30 / 40

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

A) Evaporator

B) Municipal water supply

C) Deep well

D) Chiller

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

31 / 40

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

A) Refrigerant escapes through low pressure leaks.

B) Air and moisture enter through the purge unit.

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

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.

32 / 40

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

A) 500 microns

B) 25 mm Hg absolute

C) 0 inches Hg

D) 10 inches Hg

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

33 / 40

33) 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.

34 / 40

34) 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.

35 / 40

35) 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.

36 / 40

36) 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.

37 / 40

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

A) None of the above

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

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

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%.

38 / 40

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

A) Monthly

B) Every five years

C) Annually

D) Biannually

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

39 / 40

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

A) 15 psig

B) 10 psia

C) 15 psia

D) 5 psig

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

40 / 40

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

A) The recovery compressor

B) The system water pumps

C) All the above

D) The recovery condenser water

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

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