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

Last Updated on January 18, 2025

EPA 608 Type 3 Practice Test 2025 (Low-pressure Appliances) certification exam questions 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) Why should oxygen or compressed air never be used to pressurize a system?

A) It can cause corrosion

B) It can cause an explosion

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.

2 / 40

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

A) Use two recovery machines

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

C) Recover on a hot day

D) Heat the recovery tank

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

3 / 40

3) 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) 10 lbs of vapor after all the liquid has been removed

C) 20 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.

4 / 40

4) 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.

5 / 40

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

A) Use a larger vacuum pump

B) Increase the evacuation rate

C) Reduce the evacuation pressure

D) Circulate warm water through the chiller

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

6 / 40

6) 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) 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.

7 / 40

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

A) a and b

B) Remove the liquid first.

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.

8 / 40

8) How should a water box be leak tested?

A) Test the water for traces of refrigerant

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

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.

9 / 40

9) 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 35% in all commercial and industrial process refrigeration

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

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%.

10 / 40

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

A) The refrigerant will expand

B) The cylinder may explode

C) All of the above

D) The pressure will increase

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

11 / 40

11) 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.

12 / 40

12) 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) 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 water box be leak tested?

A) Look for bubbles in the water

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

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.

14 / 40

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

A) Air and moisture enter through the purge unit.

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

C) Refrigerant leaks out through shaft seals and gaskets.

D) Refrigerant escapes through low pressure leaks.

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

15 / 40

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

A) Evaporator

B) Condenser

C) Gaskets or fittings

D) Purge unit

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

16 / 40

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

A) 10 psia

B) 15 psig

C) 5 psig

D) 15 psia

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

17 / 40

17) 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.

18 / 40

18) 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.

19 / 40

19) 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) Use a larger vacuum pump

D) Increase the evacuation rate

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

20 / 40

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

A) Use a flashlight to expose pinholes

B) Hydrostatic tube test kit

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.

21 / 40

21) 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.

22 / 40

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

A) All of the above

B) Avoid direct contact with refrigerants

C) Use appropriate personal protective equipment (PPE)

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.

23 / 40

23) 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.

24 / 40

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

A) The system water pumps

B) The recovery condenser water

C) The recovery compressor

D) All the above

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

25 / 40

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

A) Testing for leaks in water tubes

B) Monitoring refrigerant flow

C) Measuring pressure drops

D) Checking refrigerant levels

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

26 / 40

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

A) Oxygen combined with oil in the system will explode

B) The rupture disc will fail

C) Shaft seals will fail

D) None of the above

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

27 / 40

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

D) None of the above

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

28 / 40

28) 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) Leak check every year

D) There are specific recommendations.

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.

29 / 40

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

A) Control refrigerant flow

B) Monitor system temperature

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.

30 / 40

30) 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 contaminate the refrigerant

D) It can cause an explosion

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

31 / 40

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

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

B) Use two recovery machines

C) Heat the recovery tank

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.

32 / 40

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

A) Chiller

B) Evaporator

C) Municipal water supply

D) Deep well

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

33 / 40

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

A) Evaporator

B) Shaft seal

C) Condenser

D) Cooling tower

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

34 / 40

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

A) 10 inches Hg

B) 25 mm Hg absolute

C) 500 microns

D) 0 inches Hg

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

35 / 40

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

A) Biannually

B) Annually

C) Monthly

D) Every five years

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

36 / 40

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

A) Digital gauge

B) Pressure gauge

C) Manifold gauge

D) Compound gauge

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

37 / 40

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

A) Municipal water supply

B) Deep well

C) Evaporator

D) Chiller

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

38 / 40

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

A) Hydrostatic tube test kit

B) Remove tubes and place in a tube tester

C) Inspect with a bore scope

D) Use a flashlight to expose pinholes

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

39 / 40

39) 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.

40 / 40

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

A) Increase the pressure in the system by the use of controlled hot water or heater blankets

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

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

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

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

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