Solution ID

55586

Resolution

To convert the Von Duprin 9975NL(Night Latch or Storeroom) to 9975L (Classroom) exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory):

  1. Turn the NL screw on 7500 mortise lock all the way in clockwise until screw is no longer visible. 
  2. Will also need to make sure you are using a Classroom Function trim such as a Knob, Thumbpiece or Lever trim.


To convert the Von Duprin 9975L to 9975NL exit function follow these steps (Note: the mortise lock is shipped as Night Latch from the factory):

  1. Turn the NL screw on 7500 mortise lock counter clockwise until flush with cover plate. 
  2. Will also need to make sure you are using a Night Latch trim.


Notes

Difficulty in converting may be caused by Loctite on the NL drive screw.  See solution below:

Using a Von Duprin 7500 lock the set screw is all the way in and my TP trim still works when locked.