This unit is designed with a 1-inch (1

What happens if my 24V coil isn't pulling in

Simple color-coded blue identification prevents incorrect field installation

suitable for constant modulating service in large-scale commercial hydronic systems

System Stability: Resolves main processor failures and memory-related lockouts to restore consistent heating cycles

Siemens Building Technology QAA2280.FWNC Sensor 321894-708 This unit is designed withThe Siemens Building Technology QAA2280. FWNC Sensor is a high performance room temperature sensor designed specifically for integration with Siemens Terminal Equipment Controllers (TEC). This Full HMI unit provides precision environmental monitoring within a 55F to 95F (13C to 35C) range, making it an essential component for demanding building automation systems (BAS). Built without a manufacturer logo for a clean, professional aesthetic, it features