The Nest Learning Thermostat installation process involves several steps, depending on the existing heating system and whether the thermostat is replacing a wired unit or being installed in a new location. The process includes installing a Heat Link, configuring existing programmers, connecting cables, and setting up the thermostat via a Nest Account. This guide details the procedures based on the provided documentation.
Understanding Installation Options
The Nest Learning Thermostat can be installed in two primary ways: replacing an existing wired thermostat or installing in a new location. Replacing an existing wired thermostat requires connecting to existing heating cables within the wall. Installing in a new location, such as where there was previously no thermostat or a wireless unit, necessitates a different approach. In either case, installation of the Heat Link is a necessary first step. The documentation specifies compatibility with combi and condensing boilers, system and heat-only boilers, hydronic underfloor systems, air source and ground source heat pumps (heating only), zoned systems (one thermostat per zone), switched live systems, and low-voltage (dry contact) systems.
Installing the Heat Link
Prior to installing the Nest Thermostat itself, the Heat Link must be installed. This component facilitates communication with the heating system. The installation process begins with switching off the mains power at the fuse box as high voltage cables are involved. Users should then locate the call-for-heat circuit, which may run directly from the thermostat to the boiler or through a junction box. If a combi boiler is present without a junction box, the Heat Link connects directly to the boiler. The Heat Link is attached to a wall near the boiler or junction box, ensuring 30cm of space on all sides. Cables are connected to the L (live) and N (neutral) connectors on the Heat Link, corresponding to the L and N connections in the heating system.
Connecting Existing Cables to the Nest Thermostat
When replacing an existing wired thermostat, the existing cables must be connected to the T1 and T2 connectors on the Nest Thermostat. The documentation notes that the order in which the cables are connected to these connectors is not significant. After connecting the cables, mains power should be switched back on, initiating the setup process for the Nest Thermostat. For installations involving multiple heating zones, each zone requires its own Nest Thermostat and Heat Link. A cable is used to connect the L (live) and N (neutral) connectors on the Heat Link to the L and N connections.
Installing the Nest Thermostat Base and Display
The Nest Thermostat consists of a base and a display unit. The base can be attached directly to the wall or using the trim plate, depending on the installation scenario. If the existing thermostat location is unsuitable, the Nest Thermostat can be installed in a new location using the included power plug and cord. Once the base is securely mounted, the display is pressed onto the base until it clicks into place. The documentation highlights the importance of installing the thermostat in a location where it can accurately read the temperature and is easily accessible to the homeowner. A stand for the Nest Learning Thermostat is available as a separate purchase and instructions for its installation are included with the stand itself.
Setting Up the Nest Thermostat
After physically installing the thermostat, the setup process is initiated by turning the ring and pressing to select options. The initial setup steps include choosing a language, connecting to the home’s Wi-Fi network, and confirming that the Heat Link is connected. If the homeowner previously used a programmer, the setup process also includes entering the old schedule. If a programmer is present that controls the heating, it should be set to ALWAYS ON. If the programmer only controls heating, it should be set to a constant temperature.
Creating and Accessing a Nest Account
To control the Nest Thermostat remotely via mobile devices, tablets, or laptops, a Nest Account is required. Homeowners are directed to create an account at nest.com/eu/account or by downloading the Nest app. Once the thermostat is connected to Wi-Fi, the Nest app will automatically add it to the associated Nest Account. Questions regarding connecting to a Nest Account can be addressed by visiting the Nest website.
Specific System Considerations
The documentation provides specific guidance for different heating system types. For systems with combi and condensing boilers, system and heat-only boilers, hydronic underfloor systems, and air source and ground source heat pumps (heating only), the Nest Thermostat is compatible. It also supports zoned systems, requiring one thermostat and Heat Link per zone. For switched live systems and low-voltage (dry contact) systems, the Nest Thermostat can also be integrated. In cases where the call-for-heat circuit is at mains voltage, a 0.75mm jumper can be used to connect the L (live) and 2 (common) connectors. The documentation also includes a cable diagram illustrating the SPDT relay for Heat Link connections, including neutral, live, satisfied, common, and call-for-heat wiring.
Safety Precautions
The documentation includes a warning regarding high voltage, emphasizing that Nest should be installed by a professional. It also states a commitment to data privacy, assuring users that Nest is committed to being open and honest about data usage. Users are advised to switch off mains power before working with any electrical connections.
Conclusion
The Nest Learning Thermostat installation process requires careful attention to detail, particularly regarding electrical connections and system compatibility. The process varies depending on whether the thermostat is replacing an existing unit or being installed in a new location. Successful installation involves installing the Heat Link, connecting the thermostat base and display, configuring the system via the thermostat interface, and creating a Nest Account for remote access and control. Adhering to the provided instructions and safety precautions is crucial for a successful and safe installation.