Introduzione
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 prugrammazione.
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.
Informazioni di sicurezza
- 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.
- Assicuratevi chì tutti i cunnessione di i fili sianu sicuri è conformi à i codici elettrici lucali.
- 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).
Cuntenutu di u pacchettu
Verificate chì u vostru pacchettu cuntene i seguenti elementi:
- Venstar T4900 Commercial Voyager Thermostat
- Ferramenta di muntatura (viti è tasselli murali)
- Installation Guide / User Manual (this document)

Image: Venstar T4900 Thermostat shown alongside its retail packaging, illustrating the product as it appears when unboxed.
Installazione è installazione
1. Locu
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. Spegnimentu
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.
- Marcate i fori di muntatura. Fate fori pilota se necessariu.
- Secure the thermostat base to the wall using the provided screws and anchors.

Imagine: Daretu view of the Venstar T4900 Thermostat, showing the wiring terminals and mounting plate for installation.
5. Cablu
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.
Impurtante: 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. Configurazione iniziale
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.
Istruzzioni di funziunamentu
Display è Buttons
The T4900 features a large, easy-to-read display with adjustable backlight intensity and backlit, color-coded buttons for intuitive control.
- Frecce su/giù: Adjust temperature setpoints, navigate menus, and change settings.
- Pulsante di modu: Cycles through system modes (Heat, Cool, Auto, Off).
- Pulsante di Fan: Passa da una modalità di ventilazione à l'altra (Auto, On).
- Pulsante di menu: Accesses advanced settings and programming options.
Prugrammazione
The T4900 offers flexible programming options:
- Prugrammazione di 7 ghjorni: 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.
- Prugrammazione di 1 ghjorni: 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.
Funzioni Avanzate
- 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.
Mantenimentu
Pulizia di u termostatu
Per mantene l'aspettu è a funziunalità di u vostru termostatu:
- Asciugà l'esternu cun un soffiu, damp tela.
- Ùn aduprate micca detergenti abrasivi o solventi.
- Assicuratevi chì nisuna umidità ùn entre in i cumpunenti interni.
The Venstar T4900 does not use batteries; it is powered by your HVAC system's 24V AC supply.
Risoluzione di prublemi
| Prublemu | Causa Possibile | Soluzione |
|---|---|---|
| U display di u termostat hè viotu. | Nisuna alimentazione à u termostatu. | Check the circuit breaker for your HVAC system. Ensure all wiring connections are secure. |
| U sistema di riscaldamentu/raffreddamentu ùn risponde micca. | 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. |
| E letture di temperatura parenu imprecise. | 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. |
| Ùn pò micca cunnette à Wi-Fi. | Wi-Fi module not installed, incorrect setup, network issues. | Assicurà u 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.
Specificazioni
| Marca | Venstar |
| Nome di mudellu | Venstar T4900 Commercial Voyager |
| Tipu di cuntrollu | Wi-Fi, Amazon Alexa (with ACC-VWF1 module) |
| Funzioni spiciali | 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 |
| Culore | Biancu |
| Usi specifichi per u produttu | HVAC Control (Heating, Cooling, Humidification, Dehumidification) |
| Tipu di cuntrollu di temperatura | Both (Heating and Cooling) |
| Tecnulugia di cunnessione | Wi-Fi (with ACC-VWF1 module), Z-Wave (optional, not specified in product details), Wireless (Wi-Fi) |
| Fonte d'energia | AC/DC (24 Volts) |
| Voltage | 24 Volts |
| Forma | Rettangulare |
| Tipu di visualizazione | Digitale |
| Tipu di cuntrollu | Button Control |
| Metudu di cuntrollu | Voice (via Alexa with ACC-VWF1), Manual Buttons |
| Protocolu di cunnessione | Wi-Fi |
| Tipu di muntatura | Muntu à u muru |
| Retroilluminazione | Iè |
| Pesu di l'articulu | 10.4 once |
| Dimensioni di u produttu | 2.3 x 6.3 x 5 inch |
| Numeru di mudellu di l'articulu | T4900 |
| UPC | 748528959706 |
Infurmazioni di Garanzia
The Venstar T4900 Commercial Voyager Thermostat comes with a Garanzia di u fabricatore di 1 anni. 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 websitu.
Supportu
If you require further assistance, have questions about installation, operation, or troubleshooting, please contact Venstar customer support:
- Visit the official Venstar websitu per FAQ, documenti di supportu è informazioni di cuntattu.
- 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 websitu.





