Siemens Building Technology RAA20U Thermostat Els PW 17895 Use a manometer to verify

Use a manometer to verify the actual inches of water column (WC) against the factory set point

A continuous drip often indicates debris caught in the second check valve or air trapped in the sensing line

preventing operation under hazardous venting conditions

replacement is necessary to ensure consistent flame detection

Siemens Building Technology RAA20U Thermostat Els PW 17895 Use a manometer to verifyThe 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