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 programmation.
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.
Consignes de sécurité
- 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.
- Assurez-vous que tous les raccordements électriques sont sécurisés et conformes aux normes électriques locales.
- 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 voltaget (120V/240V).
Contenu du colis
Vérifiez que votre colis contient les éléments suivants :
- Venstar T4900 Commercial Voyager Thermostat
- Matériel de montage (vis et chevilles)
- Installation Guide / User Manual (this document)

Image: Venstar T4900 Thermostat shown alongside its retail packaging, illustrating the product as it appears when unboxed.
Configuration et installation
1. Localisation
Installez le thermostat à environ 1.5 mètre du sol, dans un endroit bien aéré, à l'abri de la lumière directe du soleil, des courants d'air et des sources de chaleur. Évitez de le placer près des fenêtres, des portes ou des bouches d'aération, car cela pourrait fausser les mesures de température.
2. Mise hors tension
Before beginning installation, ensure the power to your HVAC system is completely turned off at the circuit breaker.
3. Retirez l'ancien 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. Installez le nouveau thermostat
- Séparez le couvercle avant de la base du thermostat.
- Position the thermostat base on the wall, feeding the wires through the opening.
- Marquez l'emplacement des trous de fixation. Percez des avant-trous si nécessaire.
- Secure the thermostat base to the wall using the provided screws and anchors.

Image : Arrière view of the Venstar T4900 Thermostat, showing the wiring terminals and mounting plate for installation.
5. Câblage
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 Staget.
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. Configuration initiale
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 : Avant view of the Venstar T4900 Thermostat, displaying its screen and control buttons.
Mode d'emploi
Affichage et boutons
The T4900 features a large, easy-to-read display with adjustable backlight intensity and backlit, color-coded buttons for intuitive control.
- Flèches haut/bas : Adjust temperature setpoints, navigate menus, and change settings.
- Bouton Mode : Cycles through system modes (Heat, Cool, Auto, Off).
- Bouton du ventilateur : Permet de faire défiler les modes de ventilation (Auto, Marche).
- Bouton Menu : Permet d'accéder aux paramètres avancés et aux options de programmation.
Programmation
Le T4900 offre des options de programmation flexibles :
- Programmation sur 7 jours : 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.
- Programmation sur 1 jours : 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.
Connectivité Wi-Fi et fonctionnalités intelligentes
For Wi-Fi operation and smart features, the Module Wi-Fi Venstar (Référence : 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.
Fonctionnalités avancées
- Adjustable Deadbands and Timers: Configure the temperature differential and minimum run times between staget.
- 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.
Entretien
Nettoyage du thermostat
Pour préserver l'apparence et le fonctionnement de votre thermostat :
- Essuyez l'extérieur avec un chiffon doux et sec.amp tissu.
- N'utilisez pas de nettoyants abrasifs ni de solvants.
- Veillez à ce qu'aucune humidité ne pénètre dans les composants internes.
The Venstar T4900 does not use batteries; it is powered by your HVAC system's 24V AC supply.
Dépannage
| Problème | Cause possible | Solution |
|---|---|---|
| L'affichage du thermostat est vide. | Le thermostat n'est pas alimenté. | Vérifiez le disjoncteur de votre système de chauffage, ventilation et climatisation. Assurez-vous que tous les branchements électriques sont bien serrés. |
| Le système de chauffage/climatisation ne répond pas. | 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. |
| Les relevés de température semblent inexacts. | Emplacement du thermostat, problème de capteur. | Ensure the thermostat is not exposed to direct sunlight, drafts, or heat sources. If using a remote sensor, verify its placement and connection. |
| Impossible de se connecter au Wi-Fi. | Wi-Fi module not installed, incorrect setup, network issues. | Assurez-vous que 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.
Caractéristiques
| Marque | Venstar |
| Nom du modèle | Venstar T4900 Commercial Voyager |
| Type de contrôleur | Wi-Fi, Amazon Alexa (with ACC-VWF1 module) |
| Caractéristiques spéciales | 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 |
| Couleur | Blanc |
| Utilisations spécifiques du produit | HVAC Control (Heating, Cooling, Humidification, Dehumidification) |
| Type de contrôle de température | Both (Heating and Cooling) |
| Technologie de connectivité | Wi-Fi (with ACC-VWF1 module), Z-Wave (optional, not specified in product details), Wireless (Wi-Fi) |
| Source d'énergie | AC/DC (24 volts) |
| Voltage | 24 volts |
| Forme | Rectangulaire |
| Type d'affichage | Numérique |
| Type de contrôle | Contrôle des boutons |
| Méthode de contrôle | Voice (via Alexa with ACC-VWF1), Manual Buttons |
| Protocole de connectivité | Wifi |
| Type de montage | Support mural |
| Rétroéclairage | Oui |
| Poids de l'article | 10.4 onces |
| Dimensions du produit | 2.3 x 6.3 x 5 pouces |
| Numéro de modèle de l'article | T4900 |
| Code UPC | 748528959706 |
Informations sur la garantie
The Venstar T4900 Commercial Voyager Thermostat comes with a Garantie constructeur d'un an. 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.
Soutien
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.





