Wiring diagrams for Lux thermostats are found in their instruction manuals, which are downloadable from the company's website as of 2015. The manuals contain directions for both installation and operation. If the thermostat model begins with a "P," consumers are linked to Lux's wholesale website, which also offers manuals.
On the Instructions Manual page of Lux's support section, find your thermostat on the chart and click on an English, Spanish or French PDF download. Because the company offers many varieties of thermostats, the top of the chart has links to specific categories: programmable, digital, mechanical and line voltage. The wholesale website presents a similar locator chart.