™ Installation step-by-step Nest Learning Thermostat Installation Guide
Contents Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 In the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compatibility The Nest Learning Thermostat is compatible with almost all central heating systems, including: • Combi and condensing boilers • System and heat-only boilers You don’t need Wi-Fi to use the Nest Thermostat, but Wi-Fi is required to control Nest from the Nest app.
In the box N L 1 2 3 Display Base Heat Link Trim plate Screws Welcome Guide, Installation Guide and Warranty Power cord Clips For installations in a new spot only Power plug 4 T1 T2
Before you start Do I need to install the Nest Thermostat somewhere new? The Nest Thermostat should be: Many existing wired thermostats are in rooms that are rarely used. The temperature they sense is warmer or cooler than homeowners feel. • Installed so that it can communicate wirelessly with Heat Link (up to a maximum distance of 30m).
Replacing an existing wired thermostat Choose this installation method if the current thermostat connects to heating cables in the wall and it doesn’t need to move to a better spot.
Installing the Nest Thermostat in a new spot Choose this installation if there’s a wireless thermostat, no thermostat at all or a thermostat that needs to be moved to a better spot. → Jump to page 20 Connect to the Stand for the Nest Learning Thermostat and place on a desk, shelf or other flat surface. NOTE: The stand is sold separately and comes with its own Installation Guide. More info at nest.com/eu. Installation step-by-step Install over a socket and power with the provided cord and plug.
Replacing an existing wired thermostat To replace an existing wired thermostat, you’ll need to: 1. Install the Heat Link first 2. Remove or configure the programmer 3.
REPLACE A THERMOSTAT Install Heat Link 1. Switch off mains power You’ll be working with high voltage cables, so protect yourself and the thermostat by turning off the power before you start.
Install Heat Link 2. Understand the cables Find the call-for-heat circuit in the heating system. The circuit may run directly from the thermostat to the boiler or pass through a junction box. If there’s a combi boiler with no junction box, the Heat Link will be connected directly to the boiler’s control circuit. You may need to test each cable to understand its function. Make sure you connect the correct cables to the Heat Link to avoid blowing a fuse.
REPLACE A THERMOSTAT Install Heat Link 3. Choose where you’ll install the Heat Link The Heat Link and Nest Thermostat communicate wirelessly, even if they are also connected by cables. Position the Heat Link such that large metal objects—like the boiler or hot water tank—don’t come between it and the thermostat. Metal objects can block the wireless signal. Boiler 30cm min. Thermostat Installation step-by-step Heat Link 30m max.
Install Heat Link 4. Run power to the Heat Link Use a cable to connect the L (live) and N (neutral) connectors on the Heat Link to the L and N connectors on the boiler or junction box. This will power the Heat Link. WARNING: DO NOT SKIP It’s important to install the Heat Link before the Nest Thermostat. Otherwise, high voltage current will irreparably damage the Nest Thermostat. If existing controls operate at mains voltage, you can add a jumper cable between live and common. The jumper cable should be 0.
5. Connect the control circuit to the Heat Link 6. Connect the thermostat cables to the Heat Link Connect the common and call-for-heat connectors on the boiler or junction box to the 2 (common) and 3 (call-for-heat) connectors on the Heat Link. These cables will control the heating system. Take two cables from the cable bundle that goes to the thermostat and attach them to the T1 and T2 connectors on the Heat Link. REPLACE A THERMOSTAT Install Heat Link See installation diagrams on page 32.
For zoned homes only Install Heat Link with a zoned system If this home has multiple heating zones, each zone valve will need its own Nest Thermostat and Heat Link. First, disconnect the thermostat cables from the zone valve. Use a cable to connect the L (live) and N (neutral) connectors on the Heat Link to the L and N connectors on the zone valve. Connect the common and call-forheat cables to the 2 (common) and 3 (call-for-heat) connectors on the Heat Link.
REPLACE A THERMOSTAT Install Heat Link 7. Attach the Heat Link 8. Configure the programmer Use the included screws to attach the Heat Link to a wall near the boiler or junction box, making sure to leave 30cm of space on all sides. When you’re done, put the Heat Link cover back on. If there’s a programmer that controls hot water and heating, set the heating controls to ALWAYS ON. If the programmer only controls heating, then remove it. The Heat Link will control heating in its place.
Install thermostat 9. Install the base Remove the old thermostat and attach the base. You can either attach the base directly to the wall or use the included trim plate to cover up marks or route cables that are outside the wall. The trim plate and base snap together and should be screwed to the wall as one piece. 16 Remember, if the old thermostat isn’t in a good place, you should install the Nest Thermostat in a new spot. Check the placement guidelines on page 5.
10. Connect cables 11. Attach the display Connect the existing cables to Nest’s T1 and T2 connectors. It doesn’t matter which cable goes into which connector. Press the display onto the base until it clicks into place. Installation step-by-step Switch on mains power and the Nest Thermostat will begin setup.
Install thermostat 12. Set up the Nest Thermostat Just turn the ring and press to select. During setup, you will: • Choose a language • Connect to the home’s Wi-Fi network • Confirm that Heat Link is connected • If the homeowner used to have a programmer, enter that schedule • Enter the post code • Choose an Away temperature TIP: Double check that the programmer has been removed or that its heating channel has been set to ALWAYS ON.
REPLACE A THERMOSTAT Install thermostat 13. Create a Nest Account Before the homeowner can control the Nest Thermostat from their mobile, tablet or laptop, they need a Nest Account. Tell them to create one at nest.com/eu/account or just download the Nest app. Once the thermostat is connected to Wi-Fi, the Nest app will automatically add it to a Nest Account. Installation step-by-step Questions about connecting to a Nest Account? Visit nest.com/eu/pairing.
Installing the Nest Thermostat in a new spot If you’re installing the Nest Thermostat and aren’t connecting it to any cables within the wall, then you’ll need to: 1. Install the Heat Link first 2. Remove or configure the programmer 3. Attach the Nest Thermostat to the wall 4. Plug the thermostat in with the power plug and cord NOTE: The Stand for the Nest Learning Thermostat is sold separately.
Install Heat Link 1. Switch off mains power CAUTION: High voltage cables INSTALL IN A NEW SPOT You’ll be working with high voltage cables, so protect yourself and the thermostat by turning off the power before you start.
Install Heat Link 2. Understand the cables Find the call-for-heat circuit in the heating system. The circuit may run directly from the thermostat to the boiler or pass through a junction box. If there’s a combi boiler with no junction box, the Heat Link will be connected directly to the boiler’s control circuit. You may need to test each cable to understand its function. Make sure you connect the correct cables to the Heat Link to avoid blowing a fuse.
Install Heat Link 3. Choose where you’ll install the Heat Link INSTALL IN A NEW SPOT The Heat Link and Nest Thermostat communicate wirelessly. Position the Heat Link such that large metal objects—like the boiler or hot water tank—don’t come between it and the thermostat. This can block the wireless signal. Boiler 30cm min. Installation step-by-step Thermostat Heat Link 30m max.
Install Heat Link 4. Run power to the Heat Link Use a cable to connect the L (live) and N (neutral) connectors on the Heat Link to the L and N connectors on the boiler or junction box. This will power the Heat Link.
Install Heat Link 5. Connect the control circuit to the Heat Link INSTALL IN A NEW SPOT Connect the common and call-for-heat connectors on the boiler or junction box to the 2 (common) and 3 (call-for-heat) connectors on the Heat Link. These cables will control the heating system. See installation diagrams on page 32.
For zoned homes only Install Heat Link with a zoned system If this home has multiple heating zones, each zone valve will need its own Nest Thermostat and Heat Link. First, disconnect the thermostat cables from the zone valve. Use a cable to connect the L (live) and N (neutral) connectors on the Heat Link to the L and N connectors on the zone valve. Connect the common and call-forheat cables to the 2 (common) and 3 (call-for-heat) connectors on the Heat Link.
Install Heat Link 6. Attach the Heat Link 7. Configure the programmer Use the included screws to attach the Heat Link to a wall near the boiler or junction box, making sure to leave 30cm space on all sides. When you’re done, put the Heat Link cover back on. If there’s a programmer that controls hot water and heating, set the heating controls to ALWAYS ON. If the programmer only controls heating, then remove it. The Heat Link will control heating in its place. Lastly, turn the power to the heat back on.
Install thermostat 8. Install the Nest Thermostat Install it on a wall using the included power cord, plug and clips. Instructions for installing the Stand for Nest Learning Thermostat (sold separately) come with the stand. Before attaching the base to the wall, check to make sure the thermostat is within range of the Heat Link. 28 If you’re getting rid of an old thermostat, cap its cables after you remove it, then cover up the hole in the wall.
Install thermostat 9. Install the base 10. Attach the display Make sure you install the base above a socket. You can either attach the base directly to the wall or use the trim plate to cover up marks or holes. Press the display onto the base until it clicks into place. INSTALL IN A NEW SPOT The trim plate and base snap together and should be screwed to the wall in one piece. Installation step-by-step Check the placement guidelines on page 5 before you install.
Install thermostat 11. Set up the Nest Thermostat Just turn the ring and press to select. During setup, you will: • Choose a language • Connect to the home’s Wi-Fi network • Confirm that Heat Link is connected • If the homeowner used to have a programmer, enter that schedule • Enter the post code • Choose an Away temperature TIP: Double check that the programmer has been removed or that its heating channel has been set to ALWAYS ON.
Install thermostat 12. Create a Nest Account Before the homeowner can control Nest from their mobile, tablet or laptop, they need a Nest Account. Tell them to create one at nest.com/eu/account or just download the Nest app. INSTALL IN A NEW SPOT Once the thermostat is connected to Wi-Fi, the Nest app will automatically add it to a Nest Account. Installation step-by-step Questions about connecting to a Nest Account? Visit nest.com/eu/pairing.
Cable diagrams The following diagrams show you how to install the Nest Thermostat on: • Switched live systems • Low voltage (dry contact) systems • Zone valve systems • MOMO zone valve systems Power supply for Heat Link Neutral Live SPDT relay Satisfied Common Call-for(optional) heat TIP: If the call-for-heat circuit is at mains voltage, you can jumper the L (live) and 2 (common) connectors with a 0.75mm2, 55mm long jumper cable.
General specs Connection Specification Notes L 230V AC / 50Hz mains voltage Required N 230V AC / 50Hz mains voltage Required 1 Relay normally closed 3A max. 2 Relay common 3A max. 3 Relay normally open 3A max. T1 12V DC power output to Nest Ground T2 12V DC power output to Nest Positive Note: T1 and T2 have no polarity at the thermostat.
Switched Live Power supply for Heat Link Only required if you have existing thermostat cables 230V / 50Hz mains 3A fuse 12V power to Nest Thermostat L N Boiler with “switched live” activation 34
Low voltage (dry contact) Power supply for Heat Link Only required if you have existing thermostat cables 230V / 50Hz mains 3A fuse 12V power to Nest Thermostat L N Wiring specs Boiler with low voltage / dry contact activation 35
Boiler with zone valves Power supply for Heat Link Only required if you have existing thermostat cables 230V / 50Hz mains 3A fuse 12V power to Nest Thermostat L N Boiler 36 Zone valve (Zone valve cable colours may vary)
Boiler with MOMO zone valves Power supply for Heat Link Only required if you have existing thermostat cables 230V / 50Hz mains 3A fuse 12V power to Nest Thermostat L N Zone valve (MOMO) Wiring specs Boiler 37
Nest Labs (Europe) Ltd. Limited Warranty Nest Learning Thermostat™ For online or phone support, visit nest.com/eu/support. You can also find answers in the Nest Community at nest.com/community. Recycling and disposal: visit nest.com/eu/recycle. Dispose in accordance with applicable legislation. The WEEE symbol means that your Nest Thermostat must be disposed of separately from general household waste.
cost in its original condition within thirty (30) days of the original purchase and receive a full refund. 3. WARRANTY CONDITIONS; HOW TO GET SERVICE IF YOU WANT TO CLAIM UNDER THIS LIMITED WARRANTY Before being able to claim under this Limited Warranty, the owner of the Product must (a) notify Nest Labs of the intention to claim by visiting nest.com/support/eu during the Warranty Period and providing a description of the alleged failure, and (b) comply with Nest Labs’ return shipping instructions.
64-10-0035-GB-A
