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  • SECO-LARM Enforcer Electric Deadbolt — Installation Manual

    August 31, 2026 5 min read

    Installation manual for the SECO-LARM Enforcer Electric Deadbolt series (SD-997A-DQ, SD-997BQ, SD-997B-GBQ).

    Full text manual (for reference)

    Overview

    SECO-LARM Electric Deadbolts add concealed deadbolt security to hollow metal door frames (door itself may be wood or metal). This covers the SD-997A-DQ, SD-997BQ, and SD-997B-GBQ models — electrically operated deadbolts with a stainless steel 5/8" diameter, 5/8" throw bolt, magnetic door position sensing, and adjustable lock delay timer.

    Model Comparison

    Spec SD-997A-DQ SD-997B-GBQ SD-997BQ
    Operation Fail-secure Fail-safe
    Operating voltage 12VDC 12/24VDC 12VDC
    Current draw (Standby) 320mA@12VDC 340mA@12VDC / 180mA@24VDC
    Current draw (Active) 880mA@12VDC 900mA@12VDC / 440mA@24VDC
    Status sensor SPDT, 500mA @ 12VDC (NO/NC/COM)
    Adjustable delay timer 0/3/5/9 secs 0/2.5/5/9 secs
    Weight 2 lbs, 5 oz (1kg) 1 lb, 13 oz (0.8kg)

    SD-997A-DQ: Fail-secure (locks if power is lost), 12VDC. SD-997BQ: Fail-safe (unlocks if power is lost), 12VDC. SD-997B-GBQ: Fail-safe, 12/24VDC.

    Features

    • Adds concealed deadbolt security to most wood or hollow metal doors with electrical operation
    • Stainless steel bolt, 5/8" diameter, 5/8" throw
    • Magnetic switch senses door position for positive locking
    • Attempts to relock multiple times if the door is not closed properly (SD-997A-DQ & SD-997B-GBQ only)
    • Door open/close monitor (NO/C/NC)
    • Adjustable door lock delay timer
    • Compatible with an optional digital keypad for high security without a key — easily connects to SECO-LARM's SK-1011-SQ Digital Access Keypad
    • Suitable for office-type applications
    • Optional mounting brackets available (SD-997B series)

    Mounting Location

    Can be mounted opposite the door hinges, on the header, or on top of the door away from the hinges. Mounting on the bottom of the door is not recommended due to possible dirt/dust buildup. Important: For vertical mounting of the SD-997B series only, wires must exit the top of the unit.

    Optional Mounting Brackets (SD-997B Series)

    • Surface-Mount Bracket (SD-997SMB-AQ): mounts the deadbolt and strike plate on the door jamb instead of in the door frame.
    • "U" Bracket (SD-997UB-AQ): mounts the deadbolt and strike plate on glass doors.

    Parts List

    • Lock body x1
    • Strike plate x1
    • Faceplate x1
    • Mounting tabs (large) x2, mounting tabs (small) x2
    • Oval cylinder plate x2
    • 6-Pin connector x1, 3-Pin connector x1
    • Keys x3
    • Templates x4, mounting screws
    • SD-997A-DQ also includes: manual lock/unlock cylinder x1

    Installation

    1. Determine mounting location.
    2. Tape templates to the door frame and door. Align so the deadbolt of the lock body template is centered on the deadbolt hole of the strike plate template; leave enough room at the ends for mounting tabs.
    3. Door frame cut: cut out the space for the lock body, test the fit (should be snug), and drill two 5mm screw holes as shown on the template.
    4. Door cut and mount:
      • Wood doors: chisel out a 3mm (1/8") deep space; drill the magnet hole 12mm (1/2") wide by 6mm (1/4") deep; mount the strike plate with four wood screws (magnet fits the magnet hole); drill the deadbolt hole to a depth of 16mm (5/8").
      • Hollow metal doors: cut out the space for the strike plate; drill two screw holes for each of the two mounting tabs; fix the mounting tabs inside the hollow metal door; fix the strike plate to the mounting tabs with screws.
    5. Door jamb cut and mount: cut out the space for the face of the lock body; drill one 5mm hole for each mounting tab; fix the mounting tabs inside the door jamb with screws.
      • SD-997A-DQ only: insert the lock/unlock cylinder.
      • Connect and insulate wires: Red = power input (+); Brown = power input (−); Orange = control wire (ground to release bolt); Green = door monitor COM; Yellow = door monitor N.C. (active when door closed); Blue = door monitor N.O. (active when door open). Important: correct polarity of red/brown is critical — incorrect polarity will burn out the solenoid.
      • Optionally connect to an alarm control panel or warning device to show door open/closed status.
      • Important: push all wires into the door frame; if space is a problem, cut away part of the dust catcher inside the frame, or carefully chip away drywall without damaging the wall.
      • Set the door lock delay timer: the time it takes the deadbolt to automatically lock after the door closes.
    6. For SD-997A-DQ only — Manual Lock/Unlock Cylinder: because SD-997A-DQ is fail-secure, it locks if power is cut. A separate manual lock/unlock cylinder is provided:
      1. Insert the cylinder and secure it to the lock body with the provided long screw. Turning the key or manual knob manually unlocks the SD-997A-DQ.
      2. Use the two separate templates included for drilling holes in the door frame for the key and manual knob.
      3. A separate 3-pin connector for the SD-997A-DQ can be connected to an alarm panel or annunciator to alert when the door is locked or unlocked.

    Note (SD-997A-DQ & SD-997B-GBQ only): the deadbolt automatically relocks 4 seconds after an optional external push button (egress button) is pressed, if the door was not opened. The lock body's sensor can detect if the strike plate is in close proximity (door closed); if the strike plate is misaligned, the lock body may attempt to relock multiple times and stop to prevent solenoid burnout if it fails. Important: the lock body and strike plate must be properly aligned and adjacent for correct function.

    Pull the vinyl covering off the faceplate and place the faceplate over the face of the lock body, then use screws to fix the faceplate and lock body to the mounting tabs.

    Important: do not cut wires before the plug, or the warranty will be voided.

    Troubleshooting

    Problem Possible Cause Solution
    Deadbolt does not activate when the door closes The sensor in the lock body is too far from the magnet in the strike plate Try adjusting the strike plate, lock body position, or shims
    Deadbolt activates when the door is closed, but does not lock the door Deadbolt may not be properly going into the deadbolt hole in the door Confirm the deadbolt is entering the hole (reposition strike plate if not); if it's going in but hitting the bottom of the hole (wooden door), drill a deeper hole
    How to reset unit Momentarily ground the orange wire to reset
    For any other problems Replace the unit and test again; a working unit can be substituted in another door frame to isolate the issue

    Warranty

    SECO-LARM products are warranted against defects in material and workmanship for one (1) year from the date of sale to the original consumer customer, limited to repair or replacement of any defective part returned transportation prepaid to SECO-LARM. Warranty is void if damage is caused by acts of God, misuse/abuse, neglect, unauthorized repair or alteration, improper/abnormal usage, or faulty installation.

    Contact

    SECO-LARM U.S.A., Inc. — 16842 Millikan Avenue, Irvine, CA 92606. Phone: 800-662-0800 / 949-261-2999. Fax: 949-261-7326. Email: sales@seco-larm.com. Web: www.seco-larm.com.