what are different lock functions

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ANSI F84 Classroom Lock  Outside lever locked and unlocked by key. Inside lever always unlocked for immediate egress.   ANSI F86 Storeroom Lock  Outside lever fixed. Entra...
Night Latch (NL)= key retracts the latch momentarily to allow entry. When key is removed, the latch will extend and locks the door (momentary unlock). Class Room (Lock/ Unlock)= key unlocks...
See Step 3 of the mortise lock reversing instructions(D-4010) which shows function conversions and what part(s) are needed if any are needed.
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): Turn the NL ...
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): Turn the NL screw on 7500 mortise lock counter clo...
-On the AD series offline locks only you can change the lock function from Classroom/Storeroom to a Privacy, office or apartment function out in the field. - This is done via the HHD/SUS using...