Type II Flashcards

Which instrument is essential for confirming a deep vacuum has been achieved during evacuation?

Answer: A micron (vacuum) gauge

A micron gauge accurately measures the deep vacuum levels needed for proper evacuation and dehydration.

Moisture left in a high-pressure system after service can react with refrigerant and oil to form what?

Answer: Corrosive acids

Moisture reacts with refrigerant and oil to form acids that damage system components.

Recovery is defined as removing refrigerant and storing it in an external container without doing what to it?

Answer: Necessarily testing or processing it

Recovery simply removes and stores refrigerant; it does not include testing or reprocessing.

Refrigerant that has been processed to meet AHRI Standard 700 purity is considered what?

Answer: Reclaimed

Reclaimed refrigerant has been reprocessed to meet AHRI 700 new-product purity specifications.

Before charging a previously evacuated high-pressure system, the technician should confirm the system holds what?

Answer: A stable deep vacuum with no rise

A vacuum that holds steady confirms the system is leak-free and dry before charging.

When adding refrigerant as a liquid to a high-pressure system, where should it generally be introduced?

Answer: Into the high side (liquid line) with compressor off

Liquid charging is done into the high side with the compressor off to avoid slugging the compressor.

What safety equipment should always be worn when working with pressurized high-pressure refrigerant?

Answer: Safety glasses and gloves

Safety glasses and gloves protect against frostbite and eye injury from refrigerant.