The Nest Learning Thermostat (4th Gen) offers smart home temperature control with features designed for both end-users and professional installers. This article details the installation process, configuration options, and compatibility considerations for the device, based on official documentation. The thermostat learns user preferences to create a heating and cooling schedule, adapts to occupancy for energy savings, and integrates with voice control systems. A specialized “Pro Setup” process streamlines installation for HVAC technicians, offering extended warranty benefits and simplified configuration.
Pro Setup for Professional Installers
The Pro Setup process is designed to expedite installation and configuration for HVAC professionals. Utilizing the Google Home app, technicians can install and configure the Nest Learning Thermostat even without an initial Wi-Fi connection. This process bypasses basic instructions, accelerating the setup timeline. Activation of Pro Setup requires a Nest Pro ID, which also activates an extended warranty and stores the installing company’s contact information within the thermostat and the user’s Google Home app. The documentation notes that some screens displayed during setup may vary depending on the specific HVAC equipment being configured. Pro Setup concludes with an overview of how the end-user will connect the thermostat to their Google Home app and account.
Installation Overview: Step-by-Step
Prior to installation, verifying system compatibility is crucial. Technicians should check all wires connected to the existing thermostat against the list of available connectors in the provided guide or utilize the online Compatibility Checker. The Compatibility Checker may recommend consulting a professional if uncertainties arise.
The physical installation process involves the following steps:
- Remove the existing thermostat.
- Mount the Nest base plate using the included screws and a leveling tool.
- Connect the wires, matching them to the appropriate terminals on the Nest base. Common wire connections include:
- Y – Cooling
- W – Heating
- G – Fan
- C – Common wire (if available)
- Snap the Nest display onto the base until it clicks securely.
- Restore power to the HVAC system and allow the thermostat to boot up.
- Complete the setup process using the Google Home app.
Configuring the Nest Learning Thermostat with the Google Home App
Once physically installed, the Nest Learning Thermostat requires configuration through the Google Home app. Some settings and features are exclusively available during the setup process. If the customer already has a Google Nest product and uses the Google Home app, they can add the thermostat to their existing Google Account. New users will need to download the Google Home app, create an account, and then add the Nest Learning Thermostat.
The Pro Setup process within the Google Home app involves these steps:
- Add the product via the “Add device” option in the app, selecting “Nest Learning Thermostat (4th gen).”
- Scan the QR code on the thermostat.
- Select “Pro Setup.”
- Enter the 6-digit Pro ID.
- Configure wire connections for wires in the O/B, Y2, W2, Star (*), or AQ+ terminals.
- Select the language for the thermostat.
- Review the connected wires and allow the thermostat to perform a power test.
End-User Configuration
After professional installation and Pro Setup, the end-user will connect the thermostat to their Google Home app. This process mirrors the Pro Setup, but the user selects “Already Installed” to bypass the installation instructions. They will then be prompted to connect the thermostat to Wi-Fi, enable features, and create a starter schedule. The thermostat defaults to energizing seasonally to reduce wear and tear on the reversing valve. The “O” and “B” wire settings determine whether the wire energizes in the cooling or heating mode, and this setting can be adjusted within the Google Home app after installation.
Complex System Compatibility
The Nest Learning Thermostat (4th Gen) is designed to work with a variety of HVAC systems, including those with more complex configurations.
Dual Fuel Systems
For dual fuel systems, the thermostat can be configured to operate in either dual fuel or single fuel mode. In single fuel mode, any wires connected to the W1 and W2/AUX connectors are treated as auxiliary heat that operates simultaneously with the heat pump. In dual fuel mode, alternate heat runs independently from heat pump heating. Activation of alternate heat can be based on temperature or time settings.
Advanced Heat Pump Controls
Advanced controls are available for heat pump systems, accessible through the Pro Setup process. Users can choose between “Heat Pump Balance” or custom heat pump settings. The Y2 wire can be configured for 2nd stage heating and cooling, 2nd stage cooling only, or 2nd stage heating only.
Multi-Speed Fans
The thermostat is compatible with most multi-speed fans (up to 3 speeds) utilizing standard 24-volt wiring. Fan control behavior depends on the number of fan wires connected. If a multi-speed fan has only a single wire, the system, not the thermostat, controls the fan speed.
Humidifiers and Dehumidifiers
The Nest Learning Thermostat supports whole-home humidifiers and dehumidifiers connected via one or two low-voltage wires. Pro Setup provides options for wires connected to the Star (*) or AQ+ connectors to control these devices.
What’s Included in the Box
The Nest Learning Thermostat (4th Generation) package includes:
- Nest Thermostat display
- Base plate
- Trim plate (optional)
- Mounting screws
- Nest screwdriver
- Installation guide and welcome manual
Troubleshooting and Technical Information
The documentation references troubleshooting tips and technical information, but does not provide specific details within the provided source material.
Conclusion
The Nest Learning Thermostat (4th Gen) provides a comprehensive smart home temperature control solution. The Pro Setup process simplifies installation for HVAC professionals, while the intuitive Google Home app interface allows for easy end-user configuration. Compatibility with a wide range of HVAC systems, including complex configurations like dual fuel and multi-speed fan setups, enhances its versatility. Proper system compatibility verification and careful wire connection are essential for successful installation.