What does the vacuum reading on a compound manifold gauge indicate?
2 Evacuation Levels and Verification Online Quiz Questions
Use this free practice quiz with 20 questions to review 2 Evacuation Levels and Verification, test your knowledge, and prepare for your next test or exam.
An appliance requires a recovery endpoint of 10 in. Hg vacuum, but the gauge reads 8 in. Hg vacuum. The reading the required endpoint.
For a high-pressure stationary appliance with a full charge below 200 lb, what endpoint does the table specify, regardless of whether recovery equipment was made before or on or after Nov. 15, 1993?
- A
0 in. Hg vacuum only for equipment made before Nov. 15, 1993
- B
0 in. Hg vacuum for either equipment date
- C
4 in. Hg vacuum for either equipment date
- D
10 in. Hg vacuum for either equipment date
For a low-pressure appliance, the evacuation endpoint is 25 mm Hg measured on what pressure basis?
After recovery is stopped at the target and the appliance is isolated, its pressure rises. The technician should .
For a motor-vehicle A/C recovery cylinder without a float valve, what percentage of gross weighted capacity is the specific limit noted in the material?
A medium-pressure stationary appliance has a full charge of 200 lb or more. Recovery equipment was made on or after Nov. 15, 1993. What evacuation endpoint applies?
- A
4 in. Hg vacuum
- B
10 in. Hg vacuum
- C
15 in. Hg vacuum
- D
25 mm Hg absolute
Which checks are appropriate when verifying a recovery cylinder for safe use? Select all that apply.
- A
Confirm that it is an appropriate, approved recovery cylinder for the refrigerant and pressure involved, and that it is in acceptable condition.
- B
Identify the cylinder contents and check its label and the manufacturer's limits.
- C
Estimate the amount of refrigerant in the cylinder from pressure alone.
- D
Weigh the cylinder on a suitable scale, account for tare weight, and follow applicable charge and overfill-protection limits.
Which group is excluded from the stationary-appliance evacuation table described here?
- A
High-pressure appliances, medium-pressure appliances, and low-pressure appliances
- B
Small appliances, MVACs, and MVAC-like appliances
- C
Appliances with full charges below 200 lb only
- D
Appliances using recovery equipment made before Nov. 15, 1993
Which practices support correct verification of an appliance's evacuation endpoint? Select all that apply.
- A
Use a suitable, functioning gauge while the appliance or isolated section is connected to recovery equipment.
- B
Opening the appliance before checking the gauge is acceptable if recovery has run long enough.
- C
Verify that the applicable endpoint has been reached before opening the appliance.
- D
For a low-pressure appliance, use an instrument capable of measuring the required absolute pressure.
A very-high-pressure stationary appliance is being recovered. According to the table, what endpoint applies whether the recovery equipment was made before or on or after Nov. 15, 1993?
- A
25 mm Hg absolute
- B
4 in. Hg vacuum
- C
0 in. Hg vacuum
- D
15 in. Hg vacuum
Describe a safe, standards-based approach to verifying refrigerant recovery before opening a stationary appliance, then explain how the checks differ when verifying a recovery cylinder.
A high-pressure stationary appliance has a full charge of 200 lb or more, and the recovery equipment was made before Nov. 15, 1993. What endpoint does the table specify?
- A
4 in. Hg vacuum
- B
0 in. Hg vacuum
- C
10 in. Hg vacuum
- D
15 in. Hg vacuum
A very-high-pressure stationary appliance is being evacuated. Which endpoint does the table specify, regardless of whether the recovery equipment was made before or after November 15, 1993?
- A
0 in. Hg vacuum
- B
4 in. Hg vacuum
- C
10 in. Hg vacuum
- D
25 mm Hg absolute
The evacuation table has separate columns for recovery equipment made before a certain date and equipment made on or after it. What is that dividing date?
A high-pressure stationary appliance has a full charge of 180 lb. The recovery equipment was made on or after November 15, 1993. What evacuation endpoint applies?
- A
0 in. Hg vacuum
- B
4 in. Hg vacuum
- C
10 in. Hg vacuum
- D
15 in. Hg vacuum
What evacuation endpoint does the table specify for a low-pressure stationary appliance? Enter the value in mm Hg absolute.
The 80%-by-volume fill condition used in EPA equipment test procedures is a universal field fill limit for every recovery cylinder.
- A
True
- B
False
True or false: The required evacuation endpoint before opening an appliance is the same as the deeper vacuum used to dehydrate a repaired system before charging.
- A
True
- B
False
True or false: Appliance age can never affect evacuation requirements or exceptions once the appliance's pressure class and full charge are known.
- A
True
- B
False
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