To keep the Von Duprin electric latch retraction EL or QELA exit device dogged (retracted) all day, have your access control, Key pad, key switch, fire alarm contact or any other signals ...
The QELA motor that has shipped since 2015 is self calibrating.
Older versions had a calibration button, and these notes would apply:
Calibration is an internal process of the QEL device&...