Question 76Refrigeration & AC - 1st Asst/Chief

The correct answer is A) dirt and foreign particles from coming in contact with the highly polished sealing surfaces. When installing a mechanical shaft seal on a refrigeration compressor, extreme care must be taken to prevent dirt and foreign particles from contacting the highly polished sealing surfaces. This is because any contaminants on these surfaces can compromise the seal's effectiveness and lead to leaks or failures. The sealing surfaces must be kept perfectly clean during the installation process to ensure a tight, reliable seal. The other options are incorrect because they do not address the primary concern of preventing contamination of the sealing surfaces, which is the critical factor in ensuring the proper functioning of the mechanical shaft seal.