Google Nest Protect User manual

Let’s get started
Google Nest Protect (Wired 230 V ~ 50 Hz)
Smoke and carbon monoxide alarm
User Guide

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The installation of Nest Protect should be carried out in accordance with the latest regulations.
Don’t want to install your Nest Protect yourself?
If you’d like a professional to install your Nest Protects, contact one of our Nest Pros.
Your Nest Pro will:
• remove your old smoke alarms;
• install your Nest Protects;
• connect your Nest Protects to Wi-Fi or help you connect them yourself;
• ensure all Nest Protects are wirelessly interconnected and
• give you a quick demo and answer your questions.
Find a Nest Pro installer near you at g.co/nest/install

0843-CPR-0240
097-00005-00
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Visit g.co/nest/protectbasics to learn more about installing, using and
troubleshooting Nest Protect.
Table of contents
Meet your Nest Protect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Setup and installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Location in your home . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Placement on the ceiling or wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Heads-Up and Emergency Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Daily Use and Emergency Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
General Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Inside the box you’ll nd:
Nest Protect Back plate 4 mounting screws 230V connector
3 terminal blocks
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Nest Protect is designed to detect smoke and carbon
monoxide in a residential environment.
It has multiple sensors to help it understand what’s
happening in your home, including a Split-Spectrum
Sensor to detect a wide range of slow-smouldering
and fast-aming res.
The installation of this apparatus should be carried
out by a competent person. This guide covers the
installation of Nest Protect (Wired 230 V) – model
number A14.
Requirements
You need Wi-Fi, an iOS or Android phone or tablet,
and a free account in order to use some Nest Protect
features: spoken room names, wireless mobile
notications, and soware updates. During setup,
Wi-Fi and a free account are required for wireless
interconnect and room naming. Aer all the Nest
Protects in your home are connected, they can
communicate with each other without Wi-Fi.
Meet your Nest Protect

Micro-USB connector
(not for normal use).
AC connector pins for
the 230V connector.
Baery compament: Three
AA Energizer® Ultimate Lithium
baeries (L91).
The horn enables Nest
Protect to ale you with
a loud emergency sound.
The speaker allows Nest
Protect to speak with
a human voice.
Push the buon to silence
alarms or run a test.
The light ring changes
colour to ale you.
13.5 cm
(5.3 in)
3.9 cm
(1.5 in)
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GET IT ON
Already added New
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2. Set up Nest Protect
The Nest app will guide you through each step: scanning
the Nest Protect QR code, connecting it to the Internet,
and connecting it to other Nest Protects in your home.
Go to g.co/nest/installprotect to watch the video.
Tip: Set everything out on a table for easy setup.
3. Have more Nest Protects?
The Nest app will ask you if you have additional Nest
Protects to set up. If you do, it’ll take you through a faster
setup. Make sure that you keep all your Nest Protects
together until they’re all set up and ready to be installed.
Setup and installation
(Professional installation recommended)
The installation of a smoke/CO alarm should be made
by a qualied technician, and all wiring used to install
this alarm should be made in accordance with national
regulations. Installation should be done according
to regulations and/or applicable codes in your local
jurisdiction. Permanent connection to the xed wiring
of the building should be made in a suitable junction box.
Refer to the included Safety and Warranty document
for regulatory information and additional precautions.
1. Get the Nest app
Before you install your Nest Protect on the ceiling
or wall, you’ll need to set it up with the Nest app.
Download the app from the Apple App Store or
Google Play and create a free account. You can use
a phone or tablet for setup.
Tip: Your Nest Protect came packed in a plastic
cover. Keep the cover on so that your Nest Protect
stays clean until you install it.

Fuse box
WARNING
ELECTRICAL SHOCK HAZARD
Failure to turn o the power may result in
serious electric shock, injury and death.
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5. Turn o the mains power
Protect yourself, and avoid blowing a fuse. Switch o
the correct circuit breaker for the room where you
are installing Nest Protect, or remove the fuse from
the fuse box.
Tip: To double-check Nest Protect’s room name, press
the buon once. You’ll hear the location that you
assigned to it during setup. It’ll say something like,
“Ready in the bedroom.”
4. Test before you install
Once you’ve nished seing up all your Nest Protects,
make sure that they’ve been added to your account.
Push the buon on one Nest Protect and follow the
instructions. All your Nest Protects should speak
up. Now you can install them on the ceiling or wall.

BEDROOM MASTER
BEDROOM
LIVING/
FAMILY
ROOM
KITCHEN
GARAGECELLAR
HALL
ATTIC
MASTER BEDROOMLIVING/
FAMILY
ROOM
DINING
ROOM
KITCHEN
BEDROOM BEDROOM
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Location in your home
We recommend placing a smoke alarm on every
oor and a carbon monoxide alarm in every room
containing a fuel-burning appliance.
The Nest Protect smoke and carbon monoxide
alarm should be installed:
• On every oor (smoke alarms are required by
law in ceain residences).
• In every room containing a fuel-burning
appliance (recommended for CO alarms).
• In every bedroom.
• In remote rooms that are used oen but which
may be too far away for anyone to hear an alarm.
• Outside unused rooms, like the boiler room.
Nest Protect should be installed at least 3 m (10 )
away from hobs or cooking appliances.
Make sure that there is a clear space around
all installed Nest Protects so that they are
not obstructed.
Nest Protect should NOT be installed in
unnished aics or garages.

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2
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7. Remove the old back plate
Unscrew the back plate from the ceiling or dry lining
box. Save the screws for installing the new back
plate later. You’ll see one or two cables coming from
the ceiling.
6. Remove your old smoke alarm
To prevent electric shock, make sure that the green
power light is o on the alarm. You may have to twist
the alarm to release it. Remove it carefully to avoid
damaging your ceiling or wall. There will be two or
four wires aached to the old back plate. Disconnect
them all.
Tip: Your old smoke alarm might make a loud noise
when you disconnect it.

60 cm
Maximum
15 cm
Minimum
BEST
ON CEILING
30 cm
Minimum
OKAY
ON WALL
Figure 1
Figure 2
Figure 3
ANYWHERE IN
THIS AREA
ANYWHERE IN
THIS AREA
90 cm
90 cm
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Placement on the ceiling or wall
Installation on the ceiling is recommended. Use the
back plate as a guide to mark where the screws
will go. Make sure that it’s at least 30 cm (12 inches)
away from the wall.
Placement on a sloping ceiling
If you have a sloping, pitched or cathedral
ceiling, Nest Protect should be 90 cm (35 inches)
from the highest peak.

Terminal block
230 V wire connector
Wire
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8. Aach the Nest connector
Each cable coming from the ceiling or wall will have
three or four dierently coloured wires. Their colours
may vary based on their age.
Match the live wires coming from the ceiling to the
live wire in the 230 V AC connector and put them into
a terminal block. All the neutral wires go into another
terminal block, and the eah wires into a third terminal
block. There is no need for the Interconnect wire, as
Nest Protects are wirelessly interconnected. If there’s
an interconnect wire, insulate it.
Live wire (brown or marked L)
Neutral wire (blue or marked N)
Eah wire (yellow and green), if present
Interconnect wire (usually black), if present

Terminal block
Terminal block
Wire
Tip: All smoke alarms prefer to live in a dust-free area,
so remove any dust before you install Nest Protect.
WARNING
Mixing the live and neutral connections when
connecting alarms will damage all the alarms –
ensure that the same colours are used throughout
the premises for live, neutral and interconnect
wires (if present).
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9. Install the new back plate
Screw the back plate directly into the ceiling or wall
with the screws. The screws are self-tapping so
there’s no need to drill pilot holes. If you’re installing
on an electrical box, you can re-use the old screws.
Make sure that the screws are driven all the way in
and snug against the back plate.

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2
1
1
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10. Connect power
Plug the 230 V connector into the back of your
Nest Protect.
11. Install your Nest Protect
Tuck any excess wiring into the dry lining box rst.
Line up the three tabs on the back of your Nest
Protect with the notches on the back plate. Hold Nest
Protect against the back plate and turn it clockwise.
Continue turning until it’s square with the wall or
ceiling. Install the rest of your Nest Protects if you
have more.
Tip: If you ever need to remove it (for cleaning
or baery replacement), turn o power to your
Nest Protect at the fuse box or remove the fuse rst.
Then turn it anticlockwise until it disconnects from
the back plate.

Fuse box
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12. Switch mains power back on or replace
the fuse
13. Press to test
Press the buon on one Nest Protect. It will tell you
what to do next. Every Nest Protect in the house
should speak up, conrming that they’re connected
to each other.

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Heads-Up and Emergency Alarms
Ales
When Nest Protect has something to say, it will speak
to you and light up instead of just beeping. Nest
Protect has two kinds of voice ale: Heads-Up and
Emergency Alarm.
When smoke or carbon monoxide levels are heightened
but haven’t yet reached Emergency Alarm levels, Nest
Protect can sound a Heads-Up as an early warning.
Nest Protect will pulse yellow and tell you where there’s
smoke or carbon monoxide.
You’ll get an Emergency Alarm when smoke or carbon
monoxide reach critical levels. Nest Protect will pulse
red, tell you what room the emergency is in and sound
a loud alarm. If there’s both smoke and CO present, the
smoke alarm will take priority.
Silencing
Heads-Up ales and Emergency Alarms can be silenced
by using the Nest app or pressing the buon. Only
silence an alarm once you have checked conditions at
the Nest Protect that rst sounded the alarm. Do not
silence Nest Protect by disconnecting it from mains
voltage and removing the baeries. This will disable
the alarm so that it cannot sense smoke or carbon
monoxide, leaving you at risk.
Because there are many dierent types of re, you may
experience an Emergency Alarm without having rst
experienced a Heads-Up ale. This means that critical
levels of smoke or CO occurred extremely quickly
and Nest Protect had to sound the Emergency Alarm.
Have more than one Nest Protect?
Aer all the Nest Protects in your home are connected
to each other, if there’s a Heads-Up or an Emergency
Alarm in one room, they’ll all tell you what the danger
is and which room it’s in.
If multiple Nest Protects are interconnected, a Heads-Up
ale or Emergency Alarm can be silenced only at the
Nest Protect that originally sounded the ale. You’ll need
to go to that room to silence all the Nest Protects in your
home. Always check the conditions near the Nest Protect
that rst detected the smoke or carbon monoxide before
silencing it.

What You Hear What It Means What To DoWhat You See
Heads-Up and Emergency Alarms
Silencing
Smoke levels are rising.
Carbon monoxide levels
have been high for a while.
The carbon monoxide in
the room has reached
critical levels.
YELLOW pulses.
YELLOW pulses.
RED pulses.
RED pulses.
YELLOW or
RED pulses.
GREEN pulses.
The smoke in the
room has reached
critical levels.
Ales
“PLEASE BE AWARE.
THERE’S SMOKE IN THE
[ROOM NAME]. THE
ALARM MAY SOUND.”
Put out the source of the
smoke. Then use the Nest app
or press the buon to silence
the ale.
Open a window or door to get
fresh air. Then use the Nest app
or press the buon to silence
the ale.
Get out of the
house immediately.
Make sure you’re safe and
have put out the source of
smoke or carbon monoxide.
Make sure you’re safe and
have put out the source of
smoke or carbon monoxide.
1) Keep calm and open all
doors and windows.
2) Stop using all fuel-burning
appliances and ensure that
they are turned o.
3) Evacuate the premises if
the CO alarm continues
to sound.
4) Once outside, call 999 or
the re brigade.
You’ve silenced an ale.
Nest Protect will now
keep quiet, unless smoke
or carbon monoxide
remains at critical levels.
Smoke or carbon
monoxide levels
are decreasing.
“PLEASE BE AWARE. THERE’S
CARBON MONOXIDE
IN THE [ROOM NAME].
THE ALARM MAY SOUND.”
(Alarm siren)
“EMERGENCY. THERE’S
CARBON MONOXIDE
IN THE [ROOM NAME].
MOVE TO FRESH AIR.”
“SMOKE ALARM SILENCED.”
(Alarm siren)
“EMERGENCY. THERE’S
SMOKE IN THE [ROOM
NAME].”
“CARBON MONOXIDE
ALARM SILENCED.”
“THE ALARM IS OVER.”
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Daily Use
Power
Nest Protect (Wired 230 V) has a small green light located
at the top of the Nest buon. It will be on as long as Nest
Protect is geing AC power from the electrical wires.
If there’s a wiring problem or power cut, the green
light will turn o and Nest Protect will switch to
backup baeries. You’ll also see a yellow (instead of
green) Nightly Promise light when you turn o the
lights for the night.
Nightly Promise
Nest Protect continuously tests itself, so you don’t
have to wonder if it’s working. Nightly Promise repos
on every Nest Protect in your home.
When you turn o the lights for the night, Nest
Protect will glow green for a moment – this means
that everything is working. If it glows yellow, one of the
Nest Protects in your home needs your aention.
For instance, the baeries are low, Wi-Fi is down
or there’s a problem with the sensors. Just push the
buon or use the Nest app to see what’s wrong.
Pathlight
Nest Protect usually has its light turned o, but it can
light your way as you walk underneath it in the dark. You
can enable or disable Pathlight and set its brightness
with the Nest app.
Nest Protect (Wired 230 V) also allows you to set
Pathlight to “Always On” if you want a night light. It will
turn on when it’s dark and stay on until it’s light again.
Daily Use and Emergency Preparation
Emergency Preparation
Testing
We recommend running a weekly manual test. During
a test, all interconnected Nest Protects in your home
check their sensors, power, Wi-Fi connection, light ring,
emergency siren, speaker and microphone.
When you run a test, Nest Protect will give you a
countdown before sounding the alarm so that you
have time to move away from the loud noise.
Test procedure:
1. Sta a test by pressing the buon twice.
2. Nest Protect will say: “This is only a test. The alarm
will sound.”
3. Ensure that the alarm sounds and the light
illuminates on each Nest Protect.
4. Once the Nest Protect has made sure it’s
working, it’ll tell you that everything’s OK. If you
have interconnected Nest Protects, all of them
should speak.
Sound Check
Nest Protect can automatically peorm a monthly test
to conrm that its speaker and siren are working properly.
You can choose to enable this option during initial setup
with the app, but you can change it at any time. For more
information, visit g.co/nest/soundcheck

WARNING
• DO NOT stand close to the alarm when the siren is
sounding. Exposure at close range may be harmful
to your hearing. When testing, move away before
the siren stas sounding.
• If the alarm ever fails to test correctly, have it
replaced immediately! If the alarm is not working
properly, it cannot ale you to a problem.
• DO NOT use a match, cigaree or any other
makeshi re to test the smoke alarm.
• NEVER use vehicle exhaust to test the CO alarm!
Exhaust may cause permanent damage and will
void your warranty.
• NEVER use an open ame of any kind to test this
alarm. You might accidentally damage or set re
to the unit or to your home.
What You Hear What It Means What To DoWhat You See
Daily Use And Emergency Preparation
Nest Protect is working.
The green light means
AC power is connected.
GREEN light
above the buon.
Daily Use
You turn o the
room lights for
the night, and
the GREEN light
pulses once.
Emergency
Preparation
Pathlight lights your
way at night as you
pass under it.
WHITE light.
BLUE rotates. Press the buon. Nest Protect
will walk you through next steps.
To set up or run a
manual test.
“READY. PRESS TO TEST.”
Nest Protect has tested
its sensors, power and
Wi-Fi to conrm they are
working correctly.
Sleep well thanks
to Nightly Promise.
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Cleaning your Nest Protect
Nest Protect has been designed to be as maintenance
free as possible, but you should keep it clean. As with
any smoke alarm, dust build-up on the outside or inside
of Nest Protect can stop it from working properly.
To clean Nest Protect:
1. Turn o mains power to Nest Protect or remove
the fuse (see p.8).
2. Remove it from the wall or the ceiling (turn
anticlockwise until it comes o the back plate and
detach the power connector).
3. Wipe the outside with a clean, slightly damp cloth.
Don’t use soap or solvents.
4. Place Nest Protect on a so, dry cloth with
the buon facing down. Open the baery
compament door and remove the baeries.
Remove the screws and li o the back. Be
careful not to lose the screws.
5. Gently vacuum the inside. Make sure that you
clean all the way around the mesh sides of the
smoke chamber (the large metal circle).
Note: Never use detergents or solvents (like glass
cleaner) on your Nest Protect and do not spray air
fresheners, hair spray or other aerosols near it. Do not
get water inside the alarm or paint over it..
Replacing the backup baeries
If there is a power cut, Nest Protect will use three
AA Energizer® Ultimate Lithium baeries (L91) for
backup. These baeries can be purchased at your
local retailer.
1. Turn o mains power to Nest Protect or remove
the fuse (see p.8).
2. Twist Nest Protect anticlockwise until it disconnects
from the back plate.
WARNING
• Only use baeries specied by Google. Use of
a dierent baery model will have a detrimental
eect on the operation of the smoke alarm.
The alarm may not operate properly with other
baeries. Never use rechargeable baeries,
as they may not provide a constant charge.
• Never remove the baeries from a
baery-operated alarm to stop an unwanted
alarm (caused by cooking smoke, etc.).
Removing baeries disables the alarm so that
it cannot sense smoke or carbon monoxide,
leaving you at risk.
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2
1
3
2
1
6
5
4
3
2
1
3
2
1
6
5
4
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General Maintenance
3. Detach the power connector from
the back of Nest Protect and
open the baery door.
4. Replace the baeries. Align the
+ positive and - negative ends
with the markings in the baery
compament.
5. Close the baery compament. Do not force
the door closed.
6. Re-aach the power connector.
7. Push Nest Protect onto the back plate and turn it
clockwise until you feel it grip.
8. Turn mains power to Nest Protect back on or
replace the fuse.
9. Press the buon twice.