HVAC - EPA Certification Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the HVAC - EPA Certification Exam. Study using flashcards and multiple-choice questions with detailed hints and explanations. Achieve success in your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which warning is associated with hermetic compressors under deep vacuum?

Compressors should be serviced regularly
Do not energize if the discharge service valve is open
Compressors need a high-pressure cutoff
Do not operate without refrigerant

The correct answer is: Do not energize if the discharge service valve is open

The warning regarding hermetic compressors under deep vacuum emphasizes the importance of ensuring that the discharge service valve is closed before energizing the compressor. When the discharge service valve is open, the compressor can operate in an unsafe manner, leading to a risk of damage or failure. In this scenario, the compressor may not build the necessary pressure, which could cause overheating and affect its internal components due to insufficient refrigerant flow and lubrication. Hermetic compressors are designed to work within specific pressure and temperature parameters. If the discharge service valve is open while the compressor is energized, it fails to provide the necessary resistance against the refrigerant’s flow, potentially causing the compressor to run dry. This situation can lead to significant damage, including burnout of the motor or mechanical failure. Maintaining proper operation requires that the compressor is not energized under such conditions to ensure its longevity and safety, highlighting the critical nature of this warning in HVAC practices.