Resideo TH105PLUS Programmable Thermostat 321142-301 specifically in applications like air

specifically in applications like air handling units

Once the equipment returns to a safe operating temperature

Always verify your current blower wheel orientation before installation to ensure proper airflow direction

ensure a clean seal against the heat exchanger face to prevent flue gas leakage

This is often caused by a faulty 2-stage gas valve or a signal failure from the control board

Resideo TH105PLUS Programmable Thermostat 321142-301 specifically in applications like airThe Resideo TH105PLUS is a high performance line voltage programmable thermostat purposefully engineered for precise control of electric baseboard heaters, convectors, and fan forced heating systems. Operating on a 120 240 Vac supply, this unit features advanced Triac switching technology, which provides 100% silent operation by eliminating the mechanical clicking common in traditional relay based models. Industrial grade Triac for electric heat