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View and Download Venstar T2900 installation instructions manual online. 7-Day Programmable Digital Thermostat. T2900 thermostat pdf manual download. Proper installation of the thermostat will be accomplished by following these step by step instructions. If you are unsure about any of these steps, call a Note: Following the instructions in this section will allow you to operate your thermostat using the factory default settings. These settings are depicted in View online or download PDF (34 KB) Venstar T2900 Specification • T2900 thermostats PDF manual download and more Venstar online manuals.