Product Overview
The Alarm Lock Trilogy T3 DL3500CRR26D is a weatherproof electronic digital keypad mortise lock leverset designed for secure keyless entry on both exterior and interior doors. It supports up to 300 user entry codes and offers advanced features such as event scheduling and audit trail logging.
Key Features
- Electronic Digital Lock Leverset: Programmable via keypad or PC for up to 300 user entry codes.
- Event Scheduling: Schedule up to 500 lock/unlock events to control access at specific times.
- Audit Trail: Retrieve and print a 40,000-event audit trail of successful and unsuccessful entries.
- Automatic Keypad Lockout: Disables the keypad for up to 60 seconds after multiple failed code inputs.
- Mortise Lock Mechanism: Designed to fit into the recess of a standard door stile.
- Classroom Function Latch: Locks the exterior handle for secure entry while allowing free egress from the interior.
- Weatherproof Design: Rated for temperatures from -31 to +151 degrees F (-35 to +66 degrees C).
- Durable Construction: Stainless steel trim with a satin chrome finish for corrosion resistance.
- Key Override: Features a solid brass fixed key cylinder for manual override.
Package Contents
Verify that all components are present before beginning installation:
- Trilogy T3 electronic digital keypad leverset
- Mortise latch
- Strike plate
- Latch cover
- Trim plate
- Keys (2)
- Battery pack with 5 AA batteries
Setup and Installation
Installation of the Alarm Lock Trilogy T3 DL3500CRR26D requires careful attention to detail. It is recommended that installation be performed by a qualified professional to ensure proper function and security. The leverset is designed for doors with a thickness of 1-5/8 to 1-7/8 inches and a backset width of 2-3/4 inches.
The mortise lock mechanism fits into a pocket recess in the door edge. Ensure the door is properly prepared according to the provided templates (not included in this manual, refer to the full installation guide).

Image showing the Alarm Lock Trilogy T3 electronic digital keypad mortise lock leverset with a satin chrome finish and right-hand lever. This illustrates the exterior appearance of the installed unit.
Battery Installation
The lock is powered by 5 AA batteries. Install the batteries into the battery pack according to the polarity indicators. Connect the battery pack to the lock's internal connector. Ensure the battery pack is securely housed within the door assembly.
Operating Instructions
User Code Programming
User entry codes (3 to 6 digits) can be programmed directly through the keypad or via a Windows-compatible computer using the Trilogy PC Software Kit (sold separately). Refer to the software manual for PC programming details. For keypad programming, follow the specific sequence of master code entry, programming mode activation, and user code input as outlined in the full programming guide.
Access Schedules
The lock can store up to 500 lock/unlock events, allowing you to define specific times and days for access. These schedules are typically set up using the PC software for greater precision and ease of management.
Audit Trail Retrieval
The lock maintains a time-stamped audit trail of the last 40,000 successful and unsuccessful entry attempts. This data can be retrieved to a computer or printed using an infrared printer (sold separately) for security monitoring and analysis.
Key Override
In case of electronic malfunction or for emergency access, the solid brass fixed key cylinder provides a mechanical key override. Insert the key and turn to engage or release the lock mechanism.
Automatic Lockout
To deter unauthorized access attempts, the keypad will automatically disable for up to 60 seconds after a predefined number of incorrect code inputs. LED indicators and audible tones will provide feedback during this lockout period.
Maintenance
Battery Replacement
The lock operates on 5 AA batteries, providing approximately 75,000 cycles. When the batteries are low, the lock will provide an indicator (e.g., specific LED flash or audible tone). Replace all 5 AA batteries simultaneously with new, high-quality alkaline batteries to ensure optimal performance.
Cleaning
Clean the stainless steel trim and keypad surface with a soft, damp cloth. Avoid using abrasive cleaners, solvents, or harsh chemicals, as these can damage the finish and electronic components.
Troubleshooting
- Keypad unresponsive: Check battery level and replace if necessary. Ensure battery pack is properly connected.
- Incorrect code entry: Verify the user code. Ensure the keypad is not in automatic lockout mode.
- Lock not engaging/disengaging: Check for obstructions in the door frame or latch mechanism. Ensure the mortise lock is properly aligned.
- Programming issues: Refer to the detailed programming guide or the Trilogy PC Software Kit manual for specific steps.
- LED indicators/sound not working: This may indicate a power issue or internal fault. Check batteries.
For persistent issues, contact Alarm Lock Systems technical support.
Specifications
| Specification | Detail |
|---|---|
| Model Number | DL3500CRR26D |
| Lock Type | Mortise, Keypad |
| Material | Stainless Steel |
| Finish | Satin Chrome |
| User Codes Supported | 300 (3 to 6 digits) |
| Lock/Unlock Events | 500 |
| Audit Trail Capacity | 40,000 events |
| Key Override | Solid brass, 6-pin cylinder with pinned 5 SC1 keyway |
| Temperature Rating | -31 to +151 degrees F (-35 to +66 degrees C) |
| Power Source | 5 AA batteries |
| Battery Life | Approx. 75,000 cycles |
| Fits Door Thickness | 1-5/8 to 1-7/8 inches |
| Backset Width | 2-3/4 inches |
| Certifications | ANSI/BHMA Grade 1, UL Listed (3-hour fire rating), FCC Certified, ADA compliant when properly installed |
Warranty and Support
For warranty information, technical support, or service inquiries, please contact Alarm Lock Systems directly. Keep your purchase receipt and model number (DL3500CRR26D) readily available when contacting support.
Alarm Lock Systems manufactures mechanical and electronic access controls. The company is headquartered in Amityville, NY, and meets International Organization for Standardization (ISO) standard 9002.