1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your HEI LIANG HL-4 Fingerprint Smart Door Lock. Please read this manual thoroughly before installation and use to ensure proper function and safety.
Key Features
- 4 Unlocking Methods: Fingerprint, Keypad (Passcode), Mobile App, and Emergency Mechanical Key.
- Fast Fingerprint Recognition: Unlocks in approximately 0.3 seconds.
- App Control: Manage users, access records, set automatic locks, and adjust settings via a dedicated mobile application.
- Anti-Peep Passcode: Enter random digits before or after your actual passcode to prevent onlookers from guessing your code.
- Automatic Locking: Configurable auto-lock feature for enhanced security.
- Durable Construction: Made from sturdy aluminum alloy.
- Low Power Alarm: Visual power display and alerts for low battery status.
Image 1.1: Overview of the HEI LIANG HL-4 Smart Lock's multi-functional capabilities.
2. Product Components
Before installation, please verify that all components are present and in good condition.
- Exterior Knob Assembly (with fingerprint sensor and keypad)
- Interior Knob Assembly
- Latch Bolt
- Strike Plate
- Mounting Screws
- Emergency Keys (2 included)
- Installation Template
- User Manual (this document)
Image 2.1: HEI LIANG HL-4 Smart Door Lock components (assembled view).
3. Installation Guide
The HEI LIANG HL-4 Smart Door Lock is designed for easy installation. A screwdriver is typically the only tool required.
3.1 Door Compatibility
- Door Thickness: 1-3/8 inches to 2-1/8 inches (35mm to 54mm).
- Backset: 2-3/8 inches or 2-3/4 inches (60mm or 70mm).
- Hole Diameter: 2-1/8 inches (54mm).
Image 3.1: Door measurement requirements for installation.
3.2 Installation Steps
- Prepare the Door: Ensure your door meets the compatibility requirements. If replacing an existing lock, remove it.
- Install the Latch Bolt: Insert the latch bolt into the door edge. Ensure the "UP" arrow on the latch is facing upwards.
- Install the Exterior Knob: Insert the exterior knob assembly through the door, aligning it with the latch bolt.
- Install the Interior Knob: When installing the inner knob, ensure both the outer and inner knobs are inserted according to the "UP" sign on the top. The spindle rod should be in a vertical position. Turn the adjustment arrow with your thumb to point to the center point and the "UP" symbol, then insert the arrow upward into the mounting base. Apply slight force to fully insert the back lock.
- Secure the Lock: Use the provided screws to secure both knob assemblies. Do not overtighten.
- Install Strike Plate: Install the strike plate on the door frame, aligning it with the latch bolt.
Important Note: Ensure the lock operates smoothly before closing the door completely.
4. Operating Instructions
4.1 Initial Setup and App Pairing
- Download the App: Search for the recommended smart lock application (e.g., Tuya Smart or Smart Life) on your smartphone's app store.
- Create an Account: Register for an account within the app.
- Add Device: Follow the in-app instructions to add your HEI LIANG HL-4 lock. Ensure Bluetooth is enabled on your phone and the lock is powered on.
- Add Administrator Fingerprint/Passcode: The first fingerprint or passcode registered will typically be the administrator.
Caution: Do not attempt to configure the device in the app while it is charging. Remove the charging cord before pairing or making settings changes.
Image 4.1: App control interface for the smart lock.
4.2 Unlocking Methods
- Fingerprint Unlocking: Place your registered finger on the fingerprint sensor. The lock will unlock if the fingerprint is recognized.
- Passcode Unlocking: Enter your 6-10 digit passcode on the keypad.
- Anti-Peep Feature: To enhance security, you can enter any random digits before or after your actual passcode. As long as the correct passcode sequence is embedded within the entered digits, the lock will unlock.
- App Unlocking: Open the smart lock app on your smartphone and follow the prompts to unlock the door remotely.
- Emergency Key Unlocking: In case of battery depletion or system malfunction, use the provided mechanical key to unlock the door.
Image 4.2: Demonstrating the Anti-Peep Passcode feature.
4.3 Locking Methods
- Automatic Lock: The lock can be configured via the app to automatically lock after a set period (e.g., 5 seconds) after being unlocked.
- Manual Lock: From the interior, turn the knob to lock the door. From the exterior, if auto-lock is disabled, you may need to manually engage the lock via the app or by pressing a specific button (refer to app instructions).
Image 4.3: Automatic locking feature in action.
4.4 App Functions
- User Management: Add, modify, or delete fingerprints and passcodes for various users.
- Access Schedules: Set specific times or days for certain users to have access.
- Mute Mode: Adjust the lock's volume or mute it entirely for quiet operation, ideal for bedrooms or offices.
- Temporary Codes: Generate one-time or time-limited passcodes for guests, service providers, or deliveries.
- Unlock Records: View a history of who unlocked the door and when.
- Passage Mode: Set the lock to remain unlocked for extended periods, useful for high-traffic times.
Image 4.4: Setting Mute Mode via the app.
Image 4.5: Generating a temporary access code.
5. Maintenance
5.1 Battery Management
- The lock features a visual power display and a low power alarm function.
- When the battery is low, charge the lock using a USB-C cable.
- A full charge typically takes approximately 3 hours.
- The lock can operate for up to six months on a single full charge.
- Important: Disconnect the charging cable after the battery is fully charged. Do not operate the lock while it is plugged in for charging. The battery is not removable by the user.
Image 5.1: Battery status indicators and usage duration.
5.2 Cleaning
Wipe the lock's exterior surfaces with a soft, dry cloth. Avoid using abrasive cleaners or solvents, as these can damage the finish and electronic components.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Lock does not respond. | Battery is depleted. | Charge the lock using a USB-C cable. Use the emergency key to unlock if necessary. |
| Fingerprint not recognized. | Finger is wet, dirty, or improperly placed; fingerprint not registered. | Ensure finger is clean and dry. Reposition finger on the sensor. Re-register fingerprint if issue persists. |
| App cannot connect to the lock (Bluetooth issue). | Bluetooth is off; lock is charging; app not properly paired. | Ensure Bluetooth is enabled on your phone. Disconnect charging cable from the lock. Follow app instructions for re-pairing. |
| Passcode not working. | Incorrect passcode entered; keypad malfunction. | Verify the passcode. Try using the anti-peep feature. If issue persists, use fingerprint, app, or emergency key. |
| Lock is difficult to install or fit. | Door dimensions do not match specifications; components misaligned. | Re-check door thickness, backset, and hole diameter against Section 3.1. Ensure "UP" markings are correctly aligned during assembly. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | HEI LIANG |
| Model Number | HL-4 |
| Model Name | HL-KNOB-4 |
| Lock Type | Biometric, Keypad |
| Unlocking Methods | Fingerprint, Passcode, App, Key |
| Fingerprint Recognition Rate | 99% |
| False Accept Rate | <0.01% |
| Passcode Length | 6 to 10 Digits |
| User Capacity | 100+ Fingerprints & Codes |
| Door Thickness Compatibility | 30-55mm (1-3/8" to 2-1/8") |
| Backset Compatibility | 60mm or 70mm (2-3/8" or 2-3/4") |
| Hole Diameter | 54mm (2-1/8") |
| Power Source | Rechargeable Lithium Battery (non-removable) |
| Charging Port | USB-C |
| Battery Life (approx.) | 6 months per charge |
| Material | Aluminum Alloy |
| Color | Matte Silver |
| Item Dimensions (L x W x H) | 9 x 3 x 3 inches |
| Item Weight | 0.69 Kilograms |
8. Warranty and Support
HEI LIANG products are designed for reliability and performance. For specific warranty details, please refer to the warranty card included with your product or contact HEI LIANG customer support.
If you encounter any issues or have questions regarding your HEI LIANG HL-4 Smart Door Lock, please contact our customer support team for assistance.
- Online Support: Visit the official HEI LIANG website for FAQs and support resources.
- Email Support: Refer to your product packaging or warranty card for contact email.