Which method is NOT used for lining up a main drainage eductor?

The method that is not used for lining up a main drainage eductor is checking the energy source. While it is essential to ensure that an eductor functions correctly, the focus when lining it up primarily involves aspects that directly relate to its operational efficiency, such as the discharge, verifying vacuum levels, and ensuring that the suction pathway is clear of any obstructions.

Checking the discharge ensures that the eductor is properly directing the flow of water, while verifying the vacuum confirms that the system can effectively create the necessary low-pressure area to lift water. Ensuring that the suction is clear is critical for maintaining an unobstructed flow of water into the eductor.

In contrast, the energy source pertains to the power source that drives the system and is not a direct consideration in the initial setup or lining up process of the main drainage eductor itself. This makes it the outlier among methods necessary for ensuring that the eductor is ready to operate effectively.