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%

48

EPA 608 Type 3 Low-pressure Appliances

1 / 40

1) 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.

2 / 40

2) 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) Circulate warm water through the chiller

D) Use a larger vacuum pump

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

3 / 40

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

A) Manifold gauge

B) Pressure gauge

C) Digital gauge

D) Compound gauge

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

4 / 40

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

A) Use two recovery machines

B) Heat the recovery tank

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

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.

5 / 40

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

A) Remove the liquid first.

B) a and b

C) Recover remaining vapor second.

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.

6 / 40

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

A) Chiller

B) Municipal water supply

C) Evaporator

D) Deep well

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

7 / 40

7) 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.

8 / 40

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

A) Deep well

B) Evaporator

C) Municipal water supply

D) Chiller

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

9 / 40

9) 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 form toxic compounds

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.

10 / 40

10) 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) Circulate warm water through the chiller

D) Use a larger vacuum pump

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

11 / 40

11) 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.

12 / 40

12) 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 15% in comfort cooling appliances.

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%.

13 / 40

13) 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.

14 / 40

14) 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.

15 / 40

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

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.

16 / 40

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

A) 5 psig

B) 15 psia

C) 15 psig

D) 10 psia

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

17 / 40

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

A) The pressure will increase

B) The refrigerant will expand

C) The cylinder may explode

D) All of the above

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

18 / 40

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

A) Cooling tower

B) Shaft seal

C) Condenser

D) Evaporator

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

19 / 40

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

A) 500 microns

B) 0 inches Hg

C) 10 inches Hg

D) 25 mm Hg absolute

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

20 / 40

20) 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.

21 / 40

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

A) Gaskets or fittings

B) Condenser

C) Purge unit

D) Evaporator

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

22 / 40

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

A) Shaft seals will fail

B) The rupture disc will fail

C) Oxygen combined with oil in the system will explode

D) None of the above

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

23 / 40

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

A) Avoid direct contact with refrigerants

B) Use appropriate personal protective equipment (PPE)

C) All of the above

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.

24 / 40

24) 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%.

25 / 40

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

A) Use a flashlight to expose pinholes

B) Hydrostatic tube test kit

C) Inspect with a bore scope

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

A) Increase system pressure

B) Control refrigerant flow

C) Remove non-condensables from the system

D) Monitor system temperature

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

27 / 40

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

A) The recovery condenser water

B) The recovery compressor

C) The system water pumps

D) All the above

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

28 / 40

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

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

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

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

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.

29 / 40

29) 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.

30 / 40

30) 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.

31 / 40

31) How should a water box be leak tested?

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

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

C) Test the water for traces of refrigerant

D) Look for bubbles in the water

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

32 / 40

32) 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.

33 / 40

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

A) Replace the disc and continue pressurizing

B) Reduce the pressure and monitor the system

C) Evacuate the system immediately and replace the disc

D) Increase the pressure gradually

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

34 / 40

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

A) Heat the recovery tank

B) Recover on a hot day

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

D) Use two recovery machines

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

35 / 40

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

A) Pressurize the system with an inert gas

B) Evacuate the system to 0 psig

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.

36 / 40

36) 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.

37 / 40

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

A) Biannually

B) Every five years

C) Annually

D) Monthly

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

38 / 40

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

A) All the above

B) The recovery condenser water

C) The system water pumps

D) The recovery compressor

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

39 / 40

39) 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) 20 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.

40 / 40

40) 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) 20 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.

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