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Free Online Flashcard Deck

4 System Evacuation and Vacuum Verification Free Online FlashCards

Study 4 System Evacuation and Vacuum Verification with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.

12 cards
01
Front

What does evacuation remove from a refrigerant circuit?

Back

Evacuation removes air, water vapor, and other non-condensable gases from a refrigerant circuit.

02
Front

Does evacuation replace refrigerant recovery or leak testing?

Back

No. Evacuation does not replace refrigerant recovery, leak repair, or pressure testing.

03
Front

What does a micron measure during deep evacuation?

Back

A micron is a unit of absolute pressure used to measure deep vacuum.

04
Front

What does a lower micron reading indicate?

Back

A lower micron reading means lower absolute pressure and a deeper vacuum.

05
Front

About how many microns is standard atmospheric pressure?

Back

Standard atmospheric pressure is approximately 760,000 microns.

06
Front

What is a common dehydration target for many residential systems?

Back

For many residential and light-commercial systems, a common dehydration target is 500 microns or lower, subject to manufacturer instructions.

07
Front

Is the EPA recovery level the same as a 500-micron dehydration target?

Back

No. EPA refrigerant-recovery levels are separate from a 500-micron dehydration target; recovery requirements vary by appliance and other factors.

08
Front

Where should a micron gauge be connected?

Back

Connect it on the system side, as far from the vacuum pump as practical, so it measures circuit pressure rather than mainly the pump’s vacuum.

09
Front

Can a conventional manifold gauge verify deep vacuum precisely?

Back

Conventional manifold gauges are not precise enough to verify a deep vacuum; use a micron gauge.

10
Front

Why measure vacuum at multiple points in a large system?

Back

Measuring at more than one point can help reveal restrictions or uneven evacuation in a large or branched system.

11
Front

How is a standing-vacuum test performed?

Back

Reach the specified target, isolate the system from the pump, then monitor the micron gauge for the required test period.

12
Front

Are standing-vacuum acceptance limits universal?

Back

The acceptable pressure change and test duration depend on equipment instructions and job requirements; there is no single limit for every system.