Nest A0001 User manual

Installation step by step

Learning Thermostat

Installation Guide

The Nest Learning Thermostat for the UK and

Ireland should be installed by a professional.

Please visit nest.com/eu/install to schedule your installation. You’ll see a list of approved

Nest Pro installers nearby and ﬁnd pricing information.

A Nest Pro will:

• Make sure that your heating system is working. Your system needs to be working and

needs to conform to building and safety regulations before a Pro can start working.

• Find the best place to install your Nest Thermostat.

• Install the thermostat and Heat Link.

• Connect your thermostat to Wi-Fi or help you do it yourself.

• Give you a quick product intro and demo.

If you’ve already bought installation, you can schedule it with your reseller. Find out

more at nest.com/eu/retail-install

Installation step by step

Contents

Compatibility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

In the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Before you start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installing the Heat Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installing the thermostat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

on the wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

on the stand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

ErP class. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Nest Labs (Europe) Ltd. LimitedWarranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

WARNING: High voltage. The Nest Thermostat should

be installed by a professional.

The Nest Learning Thermostat

is compatible with almost all

central heating systems, including:

• Combi boilers

• System boilers with hot water control

• Heat pumps (heating only)

• Zoned systems

• District heating with electrical

control valve

Control systems:

• On/Off

• OpenTherm

A Wi-Fi connection is required

to control the Nest Thermostat

with the Nest app and to receive

software updates.

Compatibility

Installation step by step

Display Base Heat Link

ScrewsTrim plate

In the box

You may want to install the Nest

Thermostat somewhere new

Many wired thermostats are installed

in rooms that are rarely used, so the

temperature that they sense can be

warmer or cooler than the temperature

that homeowners feel.

If the current thermostat isn’t in a good

location, install the Nest Thermostat

in a new place with the Nest Stand

(sold separately) in a room that’s used

more often.

→ Placement guidelines on page 12.

Where should you install it?

• Place it within 30 metres of the Heat

Link. Closer is generally better. Walls

and large objects between them can

affect their communication range.

• The Nest Thermostat should be in a

room that’s used often so that it can

read the right temperature, can sense

when the home is empty and know

when to automatically turn down

the heating.

• It should have a clear view of the room.

• Wall-mounted thermostats should

be installed on an interior wall.

• Make sure that it’s away from draughts

and heat sources.

• For zoned systems, install the

thermostat in the zone that

it’s controlling.

Before you start

Installation step by step

Installing the Heat Link

It’s important to install the Heat Link before the

Nest Thermostat. Do not connect the thermostat

directly to your heating system. High voltage current

will irreparably damage the Nest Thermostat.

The Heat Link is necessary, even if there are

low-voltage wires.

Installing the Heat Link

1. Switch off mains power

You’ll be working with mains voltage,

so protect yourself, the heating system

and the thermostat by turning off the

power before you start.

Fuse box Switch

CAUTION: High voltage wires

Installation step by step

2. Connect to power and the control circuit

Check the heating system’s wiring to determine what

type it is.

Remove the Heat Link cover and connect the L (live)

and N (neutral) terminals on the Heat Link to the L and

N circuit on the boiler or junction box. This will power

the Heat Link.

Connect the heating control circuit to the Heat Link 1

(normally closed/satisﬁed), 2 (common), 3 (normally

open/call-for-heat) as needed.

If the system has a hot water control circuit, connect it

to 4 (normally closed/satisﬁed), 5 (common), 6 (normally

open/call-for-heat) as needed.

If you have an OpenTherm boiler, connect its control

circuit to the OT1 and OT2 terminals.

→ See pages 20-25 for detailed wiring diagrams.

INSTALLING THE HEAT LINK

3. Connect to the thermostat wires

Skip to the next step if you’re installing

the Nest Thermostat on the stand and

are using the USB cable for power.

Take two wires from the wire bundle that

goes to the current thermostat and

attach them to the T1 and T2 terminals

on the Heat Link.

HEATING

Call-for-heat (normally open)

Common

Satisﬁed (normally closed)

12 V DC power

Earth

OpenTherm (42 V DC max)

HOT WATER

Call-for-heat (normally open)

Common

Satisﬁed (normally closed)

230 V AC live and neutral

input power

Installing the Heat Link

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