Normally Open (N/O) Logic: Integrated safety design prevents startup if the switch is stuck in a closed position at the beginning of the cycle

Enhanced Safety: Acts as a primary fail-safe to interrupt power to the gas valve or ignition control if temperatures exceed the safety threshold

field-proven sensor is necessary

providing the necessary clearance for actuators mounted away from the damper frame due to insulation or physical obstructions

Siemens Building Technology RAA20U Thermostat Els PW 17895 Normally Open (N/O) Logic: IntegratedThe Siemens RAA20U Thermostat is a high performance mechanical solution designed for precision temperature control in heating only or cooling only applications. Functioning as a two wire, gas diaphragm based room thermostat, this unit offers a reliable two position (on off) control algorithm suitable for both 24V low voltage and line voltage systems (24 to 277 Vac). As a veteran technician knows, the Siemens RAA20U is the direct replacement for 1A10