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)

0%

24

EPA 608 Type 3 Low-pressure Appliances

1 / 40

1) 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.

2 / 40

2) 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 35% in all commercial and industrial process refrigeration

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%.

3 / 40

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

A) Evaporator

B) Municipal water supply

C) Chiller

D) Deep well

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

4 / 40

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

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%.

5 / 40

5) 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) Use two recovery machines

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

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

6 / 40

6) 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) Hydrostatic tube test kit

D) Use a flashlight to expose pinholes

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

7 / 40

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

A) The system water pumps

B) All the above

C) The recovery condenser water

D) The recovery compressor

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

8 / 40

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

A) Annually

B) Monthly

C) Biannually

D) Every five years

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

9 / 40

9) 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.

10 / 40

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

A) The recovery condenser water

B) The recovery compressor

C) All the above

D) The system water pumps

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

11 / 40

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

A) Evacuate the system to 0 psig

B) Vent the refrigerant to the atmosphere

C) Pressurize the system with an inert gas

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.

12 / 40

12) 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) 20 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.

13 / 40

13) 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.

14 / 40

14) 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.

15 / 40

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

A) 10 psia

B) 15 psia

C) 15 psig

D) 5 psig

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

16 / 40

16) 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.

17 / 40

17) 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.

18 / 40

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

A) Use appropriate personal protective equipment (PPE)

B) All of the above

C) Avoid direct contact with refrigerants

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.

19 / 40

19) 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) Reduce the pressure and monitor the system

D) Increase the pressure gradually

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

20 / 40

20) How should a water box be leak tested?

A) Look for bubbles in the water

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

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.

21 / 40

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

A) It can cause an explosion

B) It can contaminate the refrigerant

C) It can cause corrosion

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

A) Monitor system temperature

B) Remove non-condensables from the system

C) Control refrigerant flow

D) Increase system pressure

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

23 / 40

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

A) Manifold gauge

B) Digital gauge

C) Pressure gauge

D) Compound gauge

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

24 / 40

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

A) It can contaminate the refrigerant

B) It can cause an explosion

C) It can cause corrosion

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.

25 / 40

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

A) Evaporator

B) Condenser

C) Shaft seal

D) Cooling tower

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

26 / 40

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

A) The refrigerant will expand

B) All of the above

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.

27 / 40

27) 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) a and b

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.

28 / 40

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

A) 0 inches Hg

B) 500 microns

C) 25 mm Hg absolute

D) 10 inches Hg

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

29 / 40

29) 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.

30 / 40

30) 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) 50 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.

31 / 40

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

A) 10 psia

B) 15 psia

C) 15 psig

D) 5 psig

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

32 / 40

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

A) The rupture disc will fail

B) None of the above

C) Shaft seals 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.

33 / 40

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

A) Circulate warm water through the chiller

B) Use a larger vacuum pump

C) Reduce the evacuation pressure

D) Increase the evacuation rate

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

34 / 40

34) 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) None of the above

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.

35 / 40

35) 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.

36 / 40

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

A) Measuring pressure drops

B) Checking refrigerant levels

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.

37 / 40

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

A) Condenser

B) Evaporator

C) Gaskets or fittings

D) Purge unit

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

38 / 40

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

A) Chiller

B) Municipal water supply

C) Deep well

D) Evaporator

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

39 / 40

39) 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 the refrigeration system because it operates in a vacuum

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.

40 / 40

40) 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.

Your score is
LinkedIn Facebook Twitter VKontakte

Try more practice test

Free EPA 608 Practice Test 2025 Official Study Guide [PDF]

Core Test (English)

Type 1 (English)

EPA 608 Type 1 (Small Appliances) Practice Test

Type 2 (English)

EPA 608 Type 2 Practice Test (High Pressure Appliances)

Type 3 (English)

EPA 608 Type 3 Low-pressure Appliances