latch not extending after elr retraction

RELATED FAQS

Question
Answer
Use a normally closed fire alarm as the input to the power supply option board (PS873-2 or PS914-2RS), this will hold the latch retracted.  During a fire alarm, the contact will open, dropping...
Electric Latch Retraction(ELR) option for the 19 Series was discontinued in December of 2006.
(For best viewing, use Chrome or Firefox browser.)ALLEGION EL SOLENOID ELECTRIC LATCH RETRACTION TROUBLESHOOTING GUIDE IF DEVICE LATCH IS NOT RETRACTING PROPERLY WHEN POWERED, FOLLOW THESE STEPS I...
The spring in the hinge case or end case assembly lifts the crossbar and both lever arms.  If broken, the crossbar and lever arms will drop down. The weight of the crossbar and levers will automati...
The Von Duprin EL option can be added to any existing 33A/35A, 98/99 series exit devices. 
  Pushing on the push  bar or activating the EL/QEL or the trim on Von Duprin XP98/99 exit device does not retract the latch, it releases the latch only. Door must be pushed or pulled when device o...
  For Product Shipped Prior to August 2012 using the old (black) potted module: a.       0-100 ft 14 gauge wire b.      0-200 ft 12...
 
- AD Series and CO series products require that the Night Latch (NL) screw is installed in the exit device.  Be sure this screw is installed- Exit hardware and strike must be properly mounted ...
The 98/99 rim and vertical rod exit devices are shipped with NL drive screw to function as a Night Latch. To convert the device to Class Room, remove the NL Drive Screw on 98/99 center case ass...
If the NL screw on the 99 device has been removed the Trilogy lock will not retract the latch.