Siemens Building Technology GRD226.1U Actuator 320788-704 If a high limit switch

If a high limit switch trips

verifying the integrity of the 100111057 switch is a standard diagnostic step

excessive vibration at high RPM

and zone systems where non-spring return operation is required and 70 lb-in of torque is sufficient for the load

Siemens Building Technology GRD226.1U Actuator 320788-704 If a high limit switchThe Siemens OpenAir GRD226. 1U is a heavy duty fire and smoke damper actuator engineered for life safety systems requiring high reliability fail safe performance. Operating at 120V AC, this spring return actuator provides 30 lb in of torque, making it a standard choice for two position control of small to medium combination fire and smoke dampers. Designed to meet stringent UL555 and UL555S safety standards, the GRD226. 1U features a 30 second drive