Introduction
This manual provides essential information for the installation, operation, and maintenance of the Honeywell TR40 Wall Module. The TR40 is a temperature-only sensor designed for use with compatible Honeywell Sylk-enabled controllers. It provides accurate room temperature readings to the control system, enabling efficient environmental management.
The TR40 module is a two-wire device, simplifying installation and integration into existing building management systems. It does not feature user-adjustable controls or a display, functioning solely as a data input device for the main controller.
Safety Information
WARNING: Electrical shock hazard. Can cause serious injury or death.
- Always disconnect power to the system before installing or servicing the TR40 module.
- Installation must be performed by a qualified and experienced technician.
- Adhere to all local electrical codes and regulations.
- Do not use this device for applications other than those specified in this manual.
Setup and Installation
Proper placement and wiring are crucial for accurate temperature sensing.
1. Choosing a Location
- Select an indoor wall location approximately 1.5 meters (5 feet) above the floor.
- Avoid locations near heat sources (e.g., lamps, direct sunlight, heating vents, appliances).
- Avoid locations near cold sources (e.g., outside walls, windows, air conditioning vents).
- Ensure good air circulation around the module.
2. Mounting the Module
- Carefully separate the front cover from the backplate.
- Mount the backplate directly to a wall or a standard electrical box using appropriate screws. Ensure the backplate is level.
- Route the Sylk wiring through the opening in the backplate.
3. Wiring
The TR40 uses a two-wire Sylk bus connection. Ensure power is disconnected before wiring.
- Connect the two Sylk wires from the compatible controller to the designated terminals on the TR40 backplate.
- Ensure connections are secure and free from loose strands.
- Refer to the wiring diagram provided with your main Sylk-enabled controller for specific terminal designations.
4. Final Assembly
- Once wiring is complete, carefully reattach the front cover to the backplate, ensuring it snaps securely into place.
- Restore power to the system. The TR40 will automatically begin communicating with the Sylk-enabled controller.

This image displays the front of the Honeywell TR40 Wall Module, a rectangular white unit with the Honeywell logo subtly embossed on the upper right side. It features a clean, minimalist design, indicating its function as a discreet temperature sensor.
Operating the TR40 Module
The Honeywell TR40 Wall Module is a passive temperature sensor. It does not have any user-operable controls, buttons, or a display. Its sole function is to measure the ambient room temperature and transmit this data to a connected Honeywell Sylk-enabled controller.
All temperature setpoint adjustments, mode changes, and system configurations are performed through the main controller or building management system to which the TR40 is connected. Refer to the user manual of your specific Honeywell controller for instructions on how to interact with the temperature data provided by the TR40.
Maintenance
The TR40 Wall Module requires minimal maintenance.
- Cleaning: Periodically wipe the exterior of the module with a soft, dry, or slightly damp cloth. Do not use abrasive cleaners, solvents, or chemical sprays, as these can damage the finish or internal components.
- Inspection: Occasionally check the module for any signs of physical damage or loose connections. If damage is observed, disconnect power and contact a qualified technician.
- Calibration: The TR40 is factory calibrated and typically does not require field calibration. If temperature readings appear inaccurate, first verify the module's placement and ensure no external heat/cold sources are influencing it. Consult your main controller's manual for any offset adjustments if available.
Troubleshooting
If you experience issues with your TR40 Wall Module, consider the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| No temperature reading on controller. |
|
|
| Inaccurate temperature reading. |
|
|
For further assistance, refer to the documentation for your main Honeywell Sylk-enabled controller or contact Honeywell technical support.
Specifications
- Model: TR40
- Brand: Honeywell
- Function: Temperature sensing only
- Connectivity: Two-wire Sylk bus
- Material: Copper (internal components, casing is typically plastic)
- Item Weight: Approximately 8 ounces (0.23 kg)
- Backlight: No
- Compatibility: Designed for use with Honeywell Sylk-enabled controllers.
Warranty and Support
Honeywell products are manufactured to high standards and are backed by a limited warranty. For specific warranty terms and conditions applicable to your TR40 Wall Module, please refer to the warranty documentation included with your purchase or visit the official Honeywell website.
For technical support, product inquiries, or service, please contact Honeywell customer service or your authorized Honeywell distributor. Contact information can typically be found on the Honeywell website or on the packaging of your product.
You can visit the Honeywell website for more information: www.honeywell.com





