Sub-Zero and Wolf describe how specific models of ice makers operate in the Installation and Operations manuals available in PDF format from the company website, as of 2015. An electronic version of this information is available at ManualsLib.
Starting on the Subzero-Wolf website homepage, scroll to the footer area at the bottom, and click Manuals and Guides under the Use and Care heading. Under the Sub-Zero Products heading, select the Previous Models and Undercounter Ice Maker (315I) categories. Click the PDF link to view the manual. The Ice Maker Requirements and Ice Maker Operations sections discuss how the ice maker works.
From ManualLib's homepage, type "Sub-zero 315i p" in the Search box and press the magnifying glass. Click on the Sub-Zero 315IP Installation & Operation Manual (24 pages) link to view the manual. The relevant information appears on page four and pages 15 through 16.