can QEL devices be held open?

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If a door is being held open by the LCN SEM 7800/1900 magnet or any ME/SE Series Sentronic LCN closer, you can remotely release that door to close by ordering the following parts and wiring per ST ...
You can use the new QEL+ device with 900-2Q option board.
A Chexit device could arm when the door is open but door may not close to secure the door unless a Door Position Switch (DPS) is connected to the device then the device goes into alarm after rearm ...
Yes the Von Duprin QEL exit device retracts the latch bolt and pushpad. Pushpad and latch bolt stay retracted as long as power is applied to the QEL exit device.
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 ...
If mechanism cover plate causes the EL solenoid to drop when slid over the solenoid, the solenoid plunger requires adjustment.  You must lengthen the rod by turning the hex nut in front of the plun...
The new QEL motor has a label affixed to the cover, the older QEL motor has no such label.  See attached image.