1. Product Overview
The Trane TCONT850_v2 ComfortLink Thermostat is designed as a replacement for obsolete American Standard ACONT900 / CNT04838 models. It is an integral part of an AccuLink Communicating System, which is an integrated and self-configuring system allowing components to communicate automatically.
Important Note: This thermostat is specifically designed for and only works with communicating HVAC systems. It will NOT function with standard non-communicating systems.
Figure 1.1: Trane ComfortLink II XL850 Thermostat Product Packaging. The box displays the product name, brand, and key features, including connectivity with Nexia Smart Home.
Key Features:
- Touchscreen interface for intuitive control.
- Programmable functionality for customized comfort settings.
- Designed as an American Standard / Trane OEM Component.
- Part of the AccuLink Communicating System for integrated system management.
2. Setup and Installation
Proper installation is crucial for the optimal performance of your Trane ComfortLink Thermostat. This device is part of a self-configuring AccuLink Communicating System, simplifying the setup process once wired correctly.
Figure 2.1: Trane ComfortLink II XL850 Thermostat and Included Components. This image shows the thermostat unit, mounting bracket, and connecting cables, including the thermostat cable.
Wiring Guidelines:
- Use 18-gauge color-coded thermostat cable for all wiring connections.
- All unused thermostat wires must be grounded at the indoor unit chassis ground only.
- If system interference is experienced, shielded cable may be required. Ground only one end of the shield to the system chassis.
- Do not run thermostat wires in the same bundle with HVAC power wires.
- Always keep thermostat wiring away from high voltage wiring to avoid interference.
Figure 2.2: Rear View of Trane ComfortLink II XL850 Thermostat with Wiring Panel. This view illustrates the connection points and internal components accessible during installation.
3. Operating Instructions
The Trane ComfortLink Thermostat features a responsive touchscreen for easy navigation and control of your HVAC system. As a programmable thermostat, it allows you to set schedules for temperature adjustments, optimizing comfort and energy efficiency.
Basic Operation:
- Power On: Ensure the thermostat is properly installed and receiving power from your communicating HVAC system.
- Touchscreen Navigation: Interact with the thermostat by touching the desired options on the screen.
- Temperature Adjustment: Use the up/down arrows or numerical input on the screen to set your desired temperature.
- Mode Selection: Select operating modes such as Heat, Cool, Auto, or Off, depending on your system's capabilities and your comfort needs.
- Fan Control: Adjust fan settings (e.g., Auto, On) as required.
Programming Schedules:
Refer to the on-screen menu for detailed instructions on setting up daily or weekly temperature schedules. The programmable feature allows you to define different temperature settings for various times of the day, such as when you are home, away, or sleeping.
4. Maintenance
The Trane ComfortLink Thermostat requires minimal maintenance to ensure continued optimal performance. Regular, simple checks can help prolong its lifespan and maintain accuracy.
General Maintenance Tips:
- Cleaning: Gently wipe the touchscreen and exterior with a soft, damp cloth. Avoid abrasive cleaners or solvents that could damage the screen or casing.
- Dust Removal: Ensure the thermostat's vents (if any) are free from dust accumulation to allow for proper air circulation and temperature sensing.
- Connection Check: Periodically ensure that the thermostat is securely mounted and that wiring connections are not loose. (This should only be done by a qualified technician if accessing internal wiring).
For any internal maintenance or complex issues, it is recommended to contact a certified HVAC technician.
5. Troubleshooting
If you encounter issues with your Trane ComfortLink Thermostat, review the following common troubleshooting steps. For persistent problems, contact Trane customer support or a qualified HVAC technician.
Common Issues and Solutions:
- Thermostat Not Powering On:
- Verify that your HVAC system has power.
- Ensure all wiring connections to the thermostat are secure and correct.
- Confirm that the thermostat is connected to a communicating HVAC system, as it will not operate with non-communicating equipment.
- Incorrect Temperature Readings:
- Ensure the thermostat is not exposed to direct sunlight, drafts, or heat sources (e.g., lamps, appliances) that could affect its temperature sensor.
- Verify that the area around the thermostat is clear of obstructions.
- System Not Responding to Thermostat Commands:
- Check if the thermostat display shows any error codes or messages.
- Confirm that the HVAC system is operational and not in a lockout mode.
- Reboot the thermostat by temporarily cutting power to the HVAC system at the breaker, waiting a few minutes, and then restoring power.
- Interference or Erratic Behavior:
- Ensure thermostat wiring is not bundled with high voltage HVAC wires.
- Consider using shielded cable if interference persists, grounding only one end of the shield to the system chassis.
6. Specifications
Detailed specifications for the Trane ComfortLink Communicating System Thermostat (Model TCONT850_v2).
Figure 6.1: Dimensions of the Trane ComfortLink II XL850 Thermostat. The image indicates approximate dimensions of 5 3/8 inches in width and 3 3/8 inches in height.
| Specification | Detail |
|---|---|
| Model Number | TCONT850_v2 |
| Brand | Trane |
| Manufacturer | Trane ® |
| Controller Type | Touchscreen |
| Special Feature | Programmable, Touchscreen Control |
| Temperature Control Type | Digital |
| Color | Gray |
| Item Weight | 1 Pound |
| First Available Date | April 23, 2019 |
Figure 6.2: Official Trane OEM Component Stamp. This stamp signifies that the product is an Original Equipment Manufacturer component from Trane.
7. Warranty and Support
The Trane ComfortLink Communicating System Thermostat comes with a factory warranty. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or contact Trane directly.
Please note that this thermostat is generally considered a non-returnable item once purchased, consistent with industry standards for certain HVAC components.
Contacting Support:
For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact Trane customer support or your authorized Trane dealer. You can typically find contact information on the Trane official website or in your product's packaging.
