Key Benefits Fail-Safe Design: Normally Open function ensures continuous flow during power interruptions for critical heating circuits

field-proven sensor is necessary

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

and CWN series

Designed as a rugged OEM replacement part for York and Johnson Controls equipment

Siemens Building Technology RAA20U Thermostat Els PW 17895 Key Benefits Fail-Safe Design: NormallyThe 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