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“ what is apartment function ”

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Resolution: Apartment Corridor Lock function is defined as a lock where the latch bolt operated by lever from either side, except when outside lever is made inoperative by a stop or mechanical means other than...:

What is the Lock Modes/States for Apartment Function?

Resolution: AD Series UI Matrix:

Apartment function

Resolution: Door automatically unlocks when opened and does not re-lock. Credential must be presented to lock’s exterior or an interior buttom must be presented to re-lock door.:

How do I change the function of the Von Duprin 7500 mortise lock from Lever ( classroom ) to NL ( night latch )?

Resolution: 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...:

What is the difference between Night Latch (NL) and Class Room function?

Resolution: 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...:

Can an 18-R-L be converted to L-NL function in the field?

Resolution: Follow step 6 of the 18-R instructions to convert trim function to Night Latch(L-NL).: