SIEMENS
SIEMENS GCA221.1U SR 160 LB-IN 120VAC 2-PT Thermostat
A spring-return damper actuator delivers 160 in-lb torque at 120 V AC with 0–10 V DC output and IP54 protection
- TypeLearning Thermostats
- Precise 90-degree rotation for accurate damper control
- 160 in-lb torque delivers strong actuation force
- Spring return closes in 15 seconds for safety
- IP54 rating protects against dust and water ingress
- Self-centering shaft coupling simplifies direct mounting
Siemens GCA221.1U Learning Thermostat
The Siemens GCA221.1U is a learning thermostat designed for building automation systems. It operates on a 120V AC supply and provides a 0 to 10V DC output signal. The unit mounts directly with a self-centering shaft coupling and delivers 160 in-lb of torque for damper control.
IP54 Spring-Return Thermal Behaviour
Rated IP54 and NEMA 2, the actuator resists dust and splashing water while running. Spring-return action closes the damper in 15 seconds when power is lost. On/Off signal type keeps control logic simple and power draw low during normal cycling.
90-Degree Stroke Sustained Operation
The 90-degree rotation stroke handles extended modulation cycles without overheating. Bidirectional CW/CCW shaft rotation accommodates varied damper orientations. Hardwired electrical connection ensures reliable contact during continuous building-automation duty.
Highlights
- Precise 90-degree rotation for accurate damper control
- 160 in-lb torque delivers strong actuation force
- Spring return closes in 15 seconds for safety
- IP54 rating protects against dust and water ingress
- Self-centering shaft coupling simplifies direct mounting
Specifications
| Brand | SIEMENS |
|---|---|
| Type | Learning Thermostats |
Questions about this item
How is the self-centering shaft coupling installed on the damper shaft?
Mount the actuator directly onto the damper shaft; the self-centering coupling aligns automatically and is secured with the clamp bolts.
What maintenance does the spring-return mechanism need over time?
No periodic maintenance is required; the spring-return function is sealed and rated for the actuator's service life.
At what point does the NEMA 2 enclosure limit installation in sustained use?
The NEMA 2 rating protects against dripping water only; it must not be used where wash-down or direct spray occurs.
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