Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the Venstar T4900 Commercial Voyager Wi-Fi Programmable Thermostat. The T4900 is designed for commercial applications, offering advanced control over heating and cooling systems with features such as Wi-Fi connectivity, Alexa compatibility, and multi-stage programming.
Please read this manual thoroughly before attempting installation or operation to ensure proper functionality and to avoid potential damage to the unit or your HVAC system.
Safety Information
- Always turn off power to the heating and cooling system at the main fuse or circuit breaker panel before installing or servicing the thermostat.
- Installation should be performed by a qualified HVAC technician or electrician.
- Ensure all wiring connections are secure and comply with local electrical codes.
- Do not short circuit the terminals on the gas valve or primary control to test the thermostat. This will damage the thermostat and void the warranty.
- This thermostat operates on 24 Volts AC. Do not connect to line voltage (120V/240V).
Package Contents
Verify that your package contains the following items:
- Venstar T4900 Commercial Voyager Thermostat
- Mounting Hardware (screws and wall anchors)
- Installation Guide / User Manual (this document)
Image: Venstar T4900 Thermostat shown alongside its retail packaging, illustrating the product as it appears when unboxed.
Setup and Installation
1. Location
Install the thermostat approximately 5 feet (1.5 meters) above the floor in an area with good air circulation, away from direct sunlight, drafts, and heat sources. Avoid locations near windows, doors, or vents that could affect temperature readings.
2. Power Off
Before beginning installation, ensure the power to your HVAC system is completely turned off at the circuit breaker.
3. Remove Old Thermostat
Carefully remove your old thermostat from the wall. Take a picture of the existing wiring connections before disconnecting any wires. Label each wire with the terminal designation it was connected to.
4. Mount the New Thermostat
- Separate the front cover from the thermostat base.
- Position the thermostat base on the wall, feeding the wires through the opening.
- Mark the mounting holes. Drill pilot holes if necessary.
- Secure the thermostat base to the wall using the provided screws and anchors.
Image: Rear view of the Venstar T4900 Thermostat, showing the wiring terminals and mounting plate for installation.
5. Wiring
Connect the wires to the corresponding terminals on the T4900 thermostat base. Refer to the wiring diagram specific to your HVAC system type (e.g., conventional, heat pump). The T4900 supports 4 Heat Stages & 2 Cool Stages.
Important: If only 4 wires are available for installation, the Venstar Add-A-Wire accessory (PN# ACC0410) may be required. Consult the Add-A-Wire installation instructions for details.
6. Attach Front Cover and Power On
Once wiring is complete, carefully attach the front cover to the thermostat base. Restore power to your HVAC system at the circuit breaker.
7. Initial Configuration
Upon first power-up, the thermostat may guide you through initial setup steps, including system type selection and basic date/time settings. Follow the on-screen prompts.
Image: Front view of the Venstar T4900 Thermostat, displaying its screen and control buttons.
Operating Instructions
Display and Buttons
The T4900 features a large, easy-to-read display with adjustable backlight intensity and backlit, color-coded buttons for intuitive control.
- Up/Down Arrows: Adjust temperature setpoints, navigate menus, and change settings.
- Mode Button: Cycles through system modes (Heat, Cool, Auto, Off).
- Fan Button: Cycles through fan modes (Auto, On).
- Menu Button: Accesses advanced settings and programming options.
Programming
The T4900 offers flexible programming options:
- 7-Day Programming: Customize schedules for each day of the week.
- 5+1+1 Day Programming: Set one schedule for weekdays, and separate schedules for Saturday and Sunday.
- 1-Day Programming: A single schedule applies to all days.
- Up to 3 Occupied Periods Per Day can be programmed.
- 365 Day Holiday Programming: Allows for specific holiday schedules.
Access programming settings via the Menu button and follow the on-screen instructions to set desired temperatures and times for each period.
Wi-Fi Connectivity and Smart Features
For Wi-Fi operation and smart features, the Venstar Wi-Fi Module (Part Number: ACC-VWF1) is required. Once installed and configured, you can:
- Control the thermostat remotely via a smartphone app.
- Integrate with Amazon Alexa for voice control.
- Utilize Advanced Demand Response (ADR) capabilities.
- Receive Equipment Fault Detection (FDD) notifications.
- Access API for 3rd party monitoring and control systems.
Refer to the ACC-VWF1 module's specific instructions for Wi-Fi setup and app integration.
Advanced Features
- Adjustable Deadbands and Timers: Configure the temperature differential and minimum run times between stages.
- Remote Sensor Averaging: The thermostat can average readings from one remote sensor with its internal sensor.
- Pre-Occupancy Fan Purge: Circulates air before occupancy periods.
- Light Activated: Features that respond to ambient light conditions.
- Energy Watch: Monitors and displays energy usage data.
Maintenance
Cleaning the Thermostat
To maintain the appearance and functionality of your thermostat:
- Wipe the exterior with a soft, damp cloth.
- Do not use abrasive cleaners or solvents.
- Ensure no moisture enters the internal components.
The Venstar T4900 does not use batteries; it is powered by your HVAC system's 24V AC supply.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat display is blank. | No power to the thermostat. | Check the circuit breaker for your HVAC system. Ensure all wiring connections are secure. |
| Heating/Cooling system not responding. | Incorrect system mode, wiring issue, or system fault. | Verify the thermostat is in the correct mode (Heat/Cool/Auto). Check wiring connections. If FDD (Equipment Fault Detection) is enabled, check for fault notifications. |
| Temperature readings seem inaccurate. | Thermostat location, sensor issue. | Ensure the thermostat is not exposed to direct sunlight, drafts, or heat sources. If using a remote sensor, verify its placement and connection. |
| Cannot connect to Wi-Fi. | Wi-Fi module not installed, incorrect setup, network issues. | Ensure the ACC-VWF1 Wi-Fi Module is correctly installed. Follow the Wi-Fi module's specific setup instructions. Check your Wi-Fi network status. |
For further assistance, please contact Venstar customer support.
Specifications
| Brand | Venstar |
| Model Name | Venstar T4900 Commercial Voyager |
| Controller Type | Wi-Fi, Amazon Alexa (with ACC-VWF1 module) |
| Special Features | Phone App Available, Temperature Sensor, Humidity Sensor, Dehumidification Control, 7-Day Programmable, 365 Day Calendar, Pre-occupancy Fan Purge, Up to 4 Hours Override, ADR Ready, FDD Notification, API for 3rd party monitor & control |
| Color | White |
| Specific Uses For Product | HVAC Control (Heating, Cooling, Humidification, Dehumidification) |
| Temperature Control Type | Both (Heating and Cooling) |
| Connectivity Technology | Wi-Fi (with ACC-VWF1 module), Z-Wave (optional, not specified in product details), Wireless (Wi-Fi) |
| Power Source | AC/DC (24 Volts) |
| Voltage | 24 Volts |
| Shape | Rectangular |
| Display Type | Digital |
| Control Type | Button Control |
| Control Method | Voice (via Alexa with ACC-VWF1), Manual Buttons |
| Connectivity Protocol | Wi-Fi |
| Mounting Type | Wall Mount |
| Backlight | Yes |
| Item Weight | 10.4 ounces |
| Product Dimensions | 2.3 x 6.3 x 5 inches |
| Item Model Number | T4900 |
| UPC | 748528959706 |
Warranty Information
The Venstar T4900 Commercial Voyager Thermostat comes with a 1-year manufacturer's warranty. Please retain your proof of purchase for warranty claims. For specific terms and conditions, refer to the warranty documentation included with your product or visit the official Venstar website.
Support
If you require further assistance, have questions about installation, operation, or troubleshooting, please contact Venstar customer support:
- Visit the official Venstar website for FAQs, support documents, and contact information.
- Contact your authorized Venstar dealer or installer.
For information on optional accessories like the Add-A-Wire (ACC0410) or Wi-Fi Module (ACC-VWF1), please refer to their respective documentation or the Venstar website.
