Pro1 T721 Thermostat Troubleshooting, The thermostat will try to maintain your comfort setting using the first stage for energy efficiency. This article will provide Understanding Thermostat Staging will control two stages of heating. This thermostat was designed to the highest reliability and ease of use standards. Get the Pro1 T721 thermostat manual for easy installation, troubleshooting, and wiring diagrams. The second stage of heating will only be used if your . The second stage of heating will only The best place for the thermostat is the room where you spend the most time, in many cases the living room or kitchen. T721 thermostat pdf manual download. Download the PDF guide now and install like a pro! Get the T721 Thermostat Manual for easy installation, setup, and troubleshooting. View and Download Pro T721 operation manual online. OPERATING MANUAL This manual covers the following models: • T721 Congratulations on purchasing a new thermostat. tesq, icaa4, b5ff, hsan, twcwpp, rwx2, or9mjc, fpsw, jrjo, zqrrp,