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PTC control modes for fire and smoke dampers
Published: June 2005
Actionair has introduced proportional torque control (PTC) for its fire and smoke dampers. The new modes will release dampers in 20 s, and powered reset takes just a minute. Standard PTC modes incorporate electric thermal release with integral fail-safe devices that confirm correct installation in the ductwork. A green LED gives visual confirmation that the mode actuator is receiving power and the thermal fuse is intact. The control range offers every level of control sophistication from simple closed/open units to models with a third control position for volume control when extracting smoke. Related articles: 
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