Smith 100223771 Thermostat is a high-limit

or tank temperatures

Typical symptoms include overheating

a small bead of high-temp silicone is often used to hold the gasket in place during the assembly of the flue collector

dry connection points

Resideo HZ311K 3 Zone Kit R-407A Smith 100223771 Thermostat is aFor residential contractors and HVAC technicians, the Resideo HZ311K 3 Zone Kit provides a reliable, streamlined solution for managing single stage zoning in conventional forced air systems. This comprehensive kit includes the Honeywell TrueZONE HZ311 panel, a 40 VA transformer (AT140A1042), and a C7735A discharge air temperature sensor (DATS). Designed for 1H 1C conventional equipment, the HZ311K supports up to three zones, ensuring precise thermal