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4 Recovering Refrigerant from Low-Pressure Appliances Online Quiz Questions

Use this free practice quiz with 20 questions to review 4 Recovering Refrigerant from Low-Pressure Appliances, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

True or false: Refrigerant can displace oxygen, so appropriate ventilation is a safety precaution during recovery.

  1. A

    True

  2. B

    False

02
Choose one
1 point

A water-filled chiller is being evacuated, and its refrigerant pressure and temperature are falling. What should the technician do to protect the water circuits?

  1. A

    Stop water circulation so the water remains still during evacuation.

  2. B

    Add refrigerant to keep the chiller tubes warm.

  3. C

    Circulate water through the chiller or drain it as the equipment instructions require.

  4. D

    Open the system before evacuation so the water pressure can equalize.

03
Fill in the blank
1 point

Before starting the recovery machine, connect the equipment and check the connections .

04
Choose one
1 point

A technician is selecting a recovery machine for a low-pressure chiller. Which approach is appropriate?

  1. A

    Use any recovery machine if its hoses fit the service connections.

  2. B

    Use equipment suitable for the appliance and refrigerant, while following the machine’s pressure limits and high-pressure cutout.

  3. C

    Disable the high-pressure cutout if it interrupts recovery.

  4. D

    Select equipment based only on the chiller’s size, without regard to refrigerant or operating conditions.

05
Written response
1 point

What is the standard evacuation target for a low-pressure appliance? Enter the value in mm Hg absolute.

06
Fill in the blank
1 point

EPA Section 608 test guidance notes that heating oil to about °F before removal can reduce refrigerant release.

07
True or false
1 point

True or false: The standard evacuation target for a low-pressure appliance is 25 mm Hg absolute whether the recovery equipment was made before or after November 15, 1993.

  1. A

    True

  2. B

    False

08
Choose all
1 point

Before connecting recovery equipment, which actions help ensure refrigerant identity and cylinder suitability? Select all that apply.

  1. A

    Identify the refrigerant and service connections, and keep different refrigerants separate.

  2. B

    Combine refrigerants in one cylinder if they came from the same appliance type.

  3. C

    Inspect the cylinder and confirm it is suitable for the refrigerant and within its test date.

  4. D

    Label the cylinder with the refrigerant type and any known contamination.

09
Written response
1 point

For a qualifying non-major repair in which the appliance will not be evacuated to the atmosphere after repair, what pressure must a low-pressure appliance be brought to before opening? Enter the value in psig.

10
Choose one
1 point

Which procedure meets the stated pressure requirement for an oil change?

  1. A

    Before opening, bring the appliance or isolated portion to no more than 5 psig, or drain the oil into a system receiver brought to that pressure.

  2. B

    Always bring the appliance to 0 psig; draining oil into a receiver is not permitted.

  3. C

    Pressurize the appliance above 5 psig before opening so refrigerant stays dissolved in the oil.

  4. D

    Drain the oil into any container without first addressing refrigerant pressure.

11
Choose all
1 point

A leak prevents evacuation to the standard table level, or reaching that level would substantially contaminate the recovered refrigerant. Which actions are consistent with the leaking-appliance exception? Select all that apply.

  1. A

    Isolate leaking from non-leaking components wherever possible.

  2. B

    Leave all non-leaking components at their current pressure whenever any part of the appliance leaks.

  3. C

    Evacuate non-leaking components to the standard required level.

  4. D

    Bring leaking components to the lowest attainable pressure without substantial contamination, but not above 0 psig.

12
Open ended
1 point

After a low-pressure appliance reaches its required evacuation target, what should the technician do to verify the level, what might a subsequent pressure rise indicate, and what action should follow if pressure rises?

13
Choose one
1 point

Under the qualifying non-major-repair exception, how should a technician proceed when a refrigerant has a boiling point above 85°F at standard atmospheric pressure and raising pressure is needed?

  1. A

    Use nitrogen first to bring every low-pressure appliance to 0 psig.

  2. B

    Do not use heat; pressurize directly with air to atmospheric pressure.

  3. C

    For a refrigerant with a boiling point above 85°F, use heat as much as possible first; nitrogen may then be used to raise pressure to atmospheric pressure.

  4. D

    Use nitrogen only after opening the appliance and removing the refrigerant.

14
Choose one
1 point

Which practice correctly manages a recovery cylinder when recovering refrigerant from a low-pressure appliance?

  1. A

    Combine refrigerants in one cylinder if it has enough capacity.

  2. B

    Use a suitable, labeled cylinder for the refrigerant and monitor its weight with a scale.

  3. C

    Fill the cylinder until its pressure matches the chiller pressure.

  4. D

    Leave the cylinder unsecured so it can be moved during recovery.

15
Choose one
1 point

After reaching the required evacuation level, why should you wait several minutes and observe whether the pressure rises?

  1. A

    To confirm that the recovery cylinder has reached its maximum gross weight.

  2. B

    To check whether refrigerant remains in liquid form or is boiling out of the oil.

  3. C

    To allow the chiller’s water circuits to warm above their normal operating temperature.

  4. D

    To verify that the recovery machine’s high-pressure cutout has activated.

16
Choose one
1 point

Which sequence should generally be used when recovering refrigerant from a low-pressure appliance?

  1. A

    Recover accessible liquid first, then recover vapor.

  2. B

    Recover vapor only; liquid refrigerant need not be removed.

  3. C

    Recover vapor first and leave accessible liquid until after opening the appliance.

  4. D

    Pressurize the appliance before recovering either liquid or vapor.

17
Choose one
1 point

If a leak prevents evacuation to the standard level, what pressure condition applies to the leaking components under the leaking-appliance exception?

  1. A

    Bring leaking components to 5 psig before opening, regardless of contamination.

  2. B

    Bring leaking components to the lowest attainable pressure without substantial contamination, but not above 0 psig.

  3. C

    Pressurize leaking components above atmospheric pressure so the leak can be located.

  4. D

    Leave leaking components at their starting pressure and evacuate only the non-leaking components to 0 psig.

18
Written response
1 point

What instrument should be used to monitor a recovery cylinder's weight while it is being filled? Enter the instrument name.

19
True or false
1 point

A chiller has an isolatable section that needs service. Under the stated EPA allowance, can the technician recover refrigerant from that section rather than the entire appliance if the refrigerant can be isolated to a system receiver?

  1. A

    True

  2. B

    False

20
Written response
1 point

A technician is planning to recover refrigerant only from an isolatable chiller section. To meet the stated condition for recovering that section separately, what must the refrigerant be isolatable to?