NL Function on exit devices

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No, the 98/99 series mortise exit device should be ordered as NL less trim. IE, 9875NL-L/TRIM. NL-OP suffix is normally used with the 98/99 series rim, surface and concealed vertical rod devices wh...
To convert the Von Duprin 98/99 Rim or Vertical (Rod or Cable) Exit Device with functional lever (996L-R/V) to act like a rigid lever (996L-NL-R/V) with key over ride follow these steps: Remove ...
This option is not available as there is no NL cam to directly drive the rods and using a key to lift the heavy stainless, brass or bronze rods would damage the key. 
Install the pinion cam at the top of the retractor per Figure 7-3 in Step 7 of 1690 Instructions.
Von Duprin 98/99 NL drive screw is located in back of the 98/99 center case assembly. NL drive screw should be left in with trim lock slide plate in up position in the 98/99 exit device with E99...
Device would be ordered as a 25C-C as of June 2012.
Recommend to order a new 990NL-R/V or M trim to change from TP/Classroom function to NL/Storeroom function. You will also need to reinstall the NL drive screw back into into the mast...
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...
The Von Duprin 98/99EO exit devices will accept any of the exterior trims that we offer for 98/99 exit devices without any extra parts. 996L, 996L-NL, 996L-DT, 996L-BE, 990NL, 990DT, and 110NL a...