Siemens Building Technology GMA221.1U Actuator 318518-761 Common Questions Is the WHA-P399-200

Common Questions Is the WHA-P399-200 compatible with the newer P499 series

and GUH series furnaces

effectively preventing overheating and reducing mechanical wear on the fan motor

This current-limiting component provides a robust 200

Siemens Building Technology GMA221.1U Actuator 318518-761 Common Questions Is the WHA-P399-200The Siemens GMA221. 1U is a high performance OpenAir damper actuator engineered for reliable 2 position (on off) control in critical HVAC environments. Operating on a 120 VAC power supply, this direct coupled unit delivers a robust 62 lb in torque (7 Nm), making it the primary choice for managing return air, mixed air, and exhaust dampers in both constant and variable air volume (VAV) systems. The integrated spring return fail safe mechanism ensures