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night latch not locking
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Question
Answer
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...:
Why would the 996L trim not lock or unlock when installed with 98 or 99EO?
Resolution:
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...:
Why does my 7500 retract the latch bolt but not re-lock the trim?
Resolution:
Tips for changing the function: The NL Drive screw will not be visible when lock body is set to Classroom function There is locktite on the screw that makes it seem like its turned down enou...:
MA lock case dimensions.
Resolution:
See below for commonly requested dimensions on the MA lock. Dimensions not found in other literature have a square around them. CL refers to "Centerline". :
Warranty information on Allegion Commercial products.
Resolution:
See here for our Warranty Information. :
Does Schlage make a mortise lock that the lever on either side retracts the latch and a key on either side retracts the deadbolt?
Resolution:
The L9466 Store/Utility Room lock can provide this functionality. Operation: Latchbolt retracted by knob/lever either side. Deadbolt thrown or retracted by key from either side. When the deadbolt ...:
What is a lock function?
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...:
Why does my Trilogy Lock not retract the latch when I replace a lever trim on a 98/99 series device?
Resolution:
If the NL screw on the 99 device has been removed the Trilogy lock will not retract the latch. :
Is E9975L-NL-F a valid configuration?
Resolution:
No, the E option (electric locking/unlocking of the mortise lock body) requires a functional L, TP, or K trim, but the cylinder would operate in a night latch function as desired. Order E9975L/TP...:
How can the Von Duprin 98/9975-L with 996L classroom trim function be converted as a night latch function in field?
Resolution:
The following steps are required to convert the Von Duprin 98/9975L from classroom to night latch function: Order new 996L-NL-M trim and reset NL drive screw in mortise lockbody as se...:
How does the Von Duprin 98/99 rim or vertical rod exit device with lever trim convert from L to L-NL function?
Resolution:
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: R...:
Can the Von Duprin 230L trim be converted to a Night Latch function?
Resolution:
We do not offer the 230L with night latch function. There is no conversion available. :
Can the Von Duprin WS98/9927 exit device be operated as Night Latch function?
Resolution:
We do not offer a true night latch, storeroom or ANSI "03" function with this device. (Entrance by trim when latchbolt is retracted by key. Key removable only when locked.) This function would da...:
How do I identify the old Falcon T lock chassis versus the new T lock chassis?
Resolution:
The Falcon T series was discontinued August 12th, 2026 and was replaced by the Falcon TM series. The date of manufacture printed on the chassis cover (see below), will determine if you have a ...:
Why is a 5100 electric strike clicking but not locking?
Resolution:
Follow the steps below to troubleshoot the problem. Measure the voltage at the electric strike. If the strike is FSE and not locking there should be no voltage at the strike and if it is FS there ...:
Chexit goes into alarm with fast flashing LED and not locking after rearm time.
Resolution:
Chexit devices shipped prior to 8-24-2015 with solenoid driven: Chexit device has a RX switch with a connector that needs to be connected to the Chexit module otherwise the alarm will sound af...:
Will the door unlock if a Von Duprin CX 98 / 99 Chexit device is deactivated with card reader and has a 996LBE trim?
Resolution:
When a CX99L-BE is not armed the exterior 996L BE lever trim will be free to retract the CX latch for entrance. When the CX99-L BE is armed the exterior 996L BE lever will not move and...:
What are the part numbers for the new Falcon T latches?
Resolution:
Falcon T Lock Latches No Longer Offered With The T Lock Effective mid June 2013 Old Part Number New Part Number &nb...:
When did the Falcon T lock begin shipping with a new latch?
Resolution:
The Falcon T series was discontinued August 12th, 2026 and was replaced by the Falcon TM series. The Falcon T lock will be featuring a new latch on June 10th, 2013. The Falcon T loc...: