Letterbox Sentry TG1 User manual

LETTERBOX SENTRY
TG1 / FG1
Letterbox Security Device
USER MANUAL

©2021 Letterbox Sentry Ltd.
Under the copyright laws, this manual may not be copied, in whole or part,
without the written consent of the copyright holder.
Every effort has been made to ensure the accuracy of this manual. The
instructions and descriptions are accurate at the time of publication. However,
succeeding versions of the equipment and manuals are subject to change
without notice.
Letterbox Sentry Ltd assumes no liability for damages incurred directly or
indirectly from errors, omissions or discrepancies between the equipment
described and the manual.
If you have any comments or suggestions about this manual, our products, or
general feedback please contact Letterbox Sentry Ltd at the following
address:
Letterbox Sentry Ltd
Eagle Park –Unit 23
Haslams Lane
Derby DE21 4TS
or Email us at: [email protected]o.uk
Visit our website at http://www.letterboxsentry.co.uk
Letterbox SentryTM is a registered trademark of Letterbox Sentry Ltd.
Disposal & Recycling
This electronic device should not be mixed with general
household waste. For proper treatment, recovery and
recycling, please take this product to designated
collection points where it will be accepted free of
charge.
Disposal of this product correctly will help save valuable
resources and prevent any potential negative effects on human health and the
environment, which could otherwise arise from inappropriate waste handling.

2LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
1 - Introduction ..…………………………………………………………. 3
Features………………..……………………………………………… 3
What is in the box ……………………..………………………… 4
2 - Functional Identification ….....……………………….……….. 5
Front panel ………………………………..……………………….. 5
Rear panel ……………………………….…………………….…… 7
Catch for locking pin ………………….……………….………. 7
3 - Power ..…………………………………………………………………. 8
Installing batteries ……………….…………………………….. 8
Battery replacement ………………………………………….. 8
DC Power Adaptor (FG1 Only) …………….……..………. 9
4 - Installation ..……………… ……………………………………….. 10
Guidance & Safety………………………………………………. 10
Tools required …….………..……………………………………. 10
Fitting the Letterbox Sentry –TG1 …….………………. 11
Fitting the Letterbox Sentry –FG1 …………………….. 12
5 - Setup ………...……………………….………………………………. 14
Setting the Time ………………………..……………………… 14
Setting the Lock Time …………..…………………………… 15
Setting the Unlock Time …………….…………………….. 16
6 - Alarms & Warnings …………………………………………….. 17
Tamper Alarm …………………………………………………… 17
Accelerant Sensor Alarm …………………………………… 17
Warnings …………………………………………………………… 18
EU Declaration of Conformity ……………………………………. 19-20
Contents

3LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Thank you for purchasing the LETTERBOX SENTRY TG1 / FG1 letterbox security
device. Please read this Owner’s Manual carefully in order to maximise the
operation of this unit.
After you have finished reading this manual, please keep it in a safe place for
future reference.
You can also download a digital copy of this manual from the Letterbox
SentryTM website (http://letterboxsentry.co.uk).
Features
When secured to the internal flap of the letterbox, the unit will give the
homeowner piece of mind by providing the following features.
•Scheduled lock and unlock times
Setting the Letterbox SentryTM to lock and unlock your letterbox
automatically at desired times, protecting your home during the hours
when you are not expecting legitimate mail. Stopping unwanted objects
from being posted into your property and prevents ‘key fishing’crime.
•Anti-Tamper alarm
If the letterbox is locked and an attempt is made to force it open, the
unit will detect a shock force and sound the inbuilt alarm. In addition, if
the unit is unable to lock due to items keeping it open, the inbuilt alarm
will sound if anyone attempts to fully open it.
•Accelerant detection alarm and automatic locking (FG1 only)
The FG1 unit has an integrated vapour sensor which will detect
flammable accelerants and other objects such as lit matches and
fireworks, locking the letterbox and setting off the inbuilt alarm to warn
the homeowner.
1 –Introduction

4LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
What’s in the box
The Letterbox SentryTM comes in two Variants:
•TG1 - battery powered variant, or
•FG1 - with built in accelerant sensor & DC power adaptor
TG1
•TG1 Unit
•User manual
•6 x AA Alkaline batteries
•Fixing template
•Locking pin catch
•2 x M6 x 12mm Round Clutch Head One Way Slot Drive Machine
Screw
•2 x Plain Stainless-Steel Countersunk Head Self Tapping Screw, N°6
x 1/2in Long/13mm Long
FG1 (Accelerant sensing unit)
•FG1 Unit
•User manual
•6 x AA Alkaline batteries
•Fixing template
•Locking pin catch
•2 x M6 x 12mm Round Clutch Head One Way Slot Drive Machine
Screw
•2 x Plain Stainless-Steel Countersunk Head Self Tapping Screw, N°6
x 1/2in Long/13mm Long
•9V 2A DC power adapter
•Adhesive cable ties for the power cable.
1 –Introduction

5LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Front panel (TG1 & FG1)
1Battery cover
The unit takes 6 x AA alkaline batteries.
2Display
Shows a variety of information, including current time, lock time, unlock
time and any warnings, such as low battery and any alarms. The display is
turned off by default after 8 seconds and activated by a button press.
3BATT LED (Red)
The red LED will flash every 15 seconds when the batteries in the unit are
running low. It also briefly flashes when the unit’s lock button is pressed.
4PWR LED (Green)
The green LED periodically flashed to show that power is good and the
unit is operational. It also flashes rapidly when the unit is in alarm and
continues a 2 second flash to indicate an alarm activation.
5Unlock / + Button
A short press unlocks the letterbox. Pressing and holding the unlock
button for 4 seconds will allow the unit’s unlock time to be modified. It is
also used for adjusting time values.
2 –Functional Identification

6LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Front panel (TG1 & FG1)
6Sounder
Generates an alarm sound for 2 minutes when either the tamper alarm or
accelerant sensor alarm (FG1 only) is triggered and beeps every 5 minutes
if the batteries are running low or the DC adaptor is unplugged on the FG1
model.
7DC Power Socket (FG1 Only)
This allows for the DC power adaptor (supplied) to be connected to the
FG1 accelerant sensor model. The FG1 requires DC power to operate
correctly.
8Right Arrow Button
A short press will display the unit’s current time. Pressing and holding the
button for 4 seconds allows the unit’s internal clock to be modified. It is
also used to move the cursor when modifying the lock, unlock and clock
times.
9Lock / - Button
A short press locks the letterbox. Pressing and holding the lock button for
4 seconds allows the unit’s lock time to be modified. It is also used for
adjusting time values.
10 Left Arrow Button
This button is used to move the cursor when modifying the lock, unlock
and clock times.
11 Locking pin
This engages and disengages with the catch to lock and unlock the
letterbox.
2 –Functional Identification

7LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Rear panel (TG1 & FG1)
1. Threaded fixing holes - for security screws
2. Accelerant / Vapour sensor (FG1 Only)
3. Locking pin
Catch for locking pin
1. Screw holes - for fixing to the door
2. Locking pin locating holes –provided at different offsets to cater for
varying letterbox flap depths. Choose the hole that best aligns with the
locking pin (see installation section).
2 –Functional Identification

8LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Powering the unit
Power sources
Both the TG1 and FG1 units require 6 AA alkaline batteries (supplied) to be
installed, in addition the FG1 unit requires the connection of the supplied DC
adaptor to provide power for the vapour sensing function of that unit.
Installing AA batteries (TG1 & FG1)
Remove the battery compartment cover on the front of the unit by removing
the two cross head screws. Remove the battery carrier and load the 6 AA
batteries into the carrier, being careful to install the batteries in the correct
orientation. Replace the loaded battery carrier into the battery compartment
ensuring that the contacts align with the ones on the unit. Replace the battery
compartment cover and fix in place with the two screws.
Battery Replacement
When the BATT red LED flashes every 15 seconds and the sounder ‘chirps’
every 5 minutes, this indicates that the unit’s batteries need replacing. Replace
all 6 batteries with good quality, high-capacity Alkaline batteries as described
previously.
Once replaced, press the right arrow to display the unit’s time, and confirm
that the time is correct, if not follow the procedure to set the unit’s time
detailed in this manual.
Once the battery carrier has been removed, the unit will go into hibernate.
You must replace the batteries within 5 minutes, otherwise the unit’s real
time clock will reset.
When replacing the batteries, ensure that they are replaced with
high-capacity Alkaline AA batteries purchased from a trusted supplier.
IMPORTANT
3 –Power

9LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
DC Adaptor (FG1 Only)
Plug in the supplied DC power adaptor into a nearby AC outlet and insert the
connector into the DC socket on the side of the FG1 unit, then turn the
connector clockwise to lock it in place.
If a mains power socket is not close enough, only a single socket mains
extension should be used.
To remove the DC plug from the unit, first turn the connector anti-clockwise
to unlock it before pulling it out of the unit.
In the event that the FG1 unit does not have DC power supplied, its vapour
sensing functionality will be turned off, however the unit will continue to
operate on its installed batteries, locking and unlocking at its scheduled
times.
When replacing the batteries, ensure that they are replaced with good
quality, high-capacity Alkaline AA batteries.
Do not install the battery cells backwards, do not charge, disassemble, short
circuit, put in a fire or mix with used or other battery types as this may lead
to explosion or leaking, causing injury.
Do not short circuit the battery pack.
Never use any power adaptor other than the Letterbox SentryTM supplied
adaptor. Use of a different adaptor could cause malfunction, fire or electric
shock.
Children should be supervised to ensure that they do not play with the unit or
the flex.
IMPORTANT
CAUTION
3 –Power

10 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Guidance & Safety
Anyone with basic DIY skills and the correct tools will be able to fit the
Letterbox SentryTM to your door.
In addition to these instructions, an installation video is available at
http://letterboxsentry.co.uk, showing how to fit the Letterbox SentryTM unit.
As always when undertaking any DIY work, ensure you take the necessary
safety precautions such as wearing safety goggles for eye protection, and
gloves for protecting the hands, also when using power tools always adhere
to the manufacturer’s operating guidelines.
Tools required (TG1 & FG1)
To fit the Letterbox SentryTM, you will require the following tools.
•6mm drill bit for the fixing holes
•Drill
•Flat head screwdriver
•Cross head screwdriver
•Fixing template (supplied with the unit)
•Cone cutter or 15mm drill bit for the vapour sensor hole
(FG1 Only)
IMPORTANT
4 –Installation

11 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Fitting the Letterbox Sentry (TG1 ONLY)
1. Place the fixing template on the internal flap of the letterbox, ensuring
it is aligned and level with the bottom edge of the flap.
2. Mark the position of the 2 fixing holes in the template onto the
internal letterbox flap.
3. Drill the fixing holes where marked, with the 6mm drill bit.
IMPORTANT: If the unit you are fitting is the FG1 with accelerant
sensor, you are required to drill an additional hole, please refer to the
section specifically for fitting the FG1.
4. Fix the Letterbox SentryTM to the internal letterbox flap using the one-
way slot drive machine screws.
NOTE: The fixing screws are tamper proof, and are one way only,
meaning you will not be able to unscrew them due to their design.
5. Fit the 6 AA batteries (supplied) as described in the previous section.
6. Carefully position the catch 1 –2mm below the locking pin when it is in
the unlocked position. Move the catch left or right aligning a suitable
locating hole directly below the locking pin.
7. Mark the position of the catch screw holes on the door and fix in
position with the two self-tapping screws provided.
8. Test that the unit securely locks the letterbox by pressing the lock
button, and that it unlocks freely by pressing the unlock button,
ensuring that the locking pin inserts correctly and withdraws from the
catch.
4 –Installation

12 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Fitting the Letterbox Sentry (FG1 ONLY)
1. Place the fixing template on the internal flap of the letterbox, ensuring
it is aligned and level with the bottom edge of the flap.
2. With the template correctly aligned, mark the position of the 2 fixing
holes and the accelerant sensor hole in the template onto the flap of
the letterbox.
3. Drill the fixing holes with the 6mm drill bit.
4. Using a cone cutter or 15mm drill bit, drill the accelerant sensor hole to
the size marked from the template. If using a cone cutter, also run the
cone cutter in the hole on the reverse side of the flap to remove any
burred metal created when making the hole.
5. Ensure the drilled holes align with those on the Letterbox SentryTM and
fix it to the letterbox flap using the one-way slot drive machine screws.
NOTE: These fixing screws are tamper proof, and are one way only,
meaning you will not be able to unscrew them due to their design.
6. Fit the 6 AA batteries (supplied) as described in section 3.
7. Carefully position the catch 1 –2mm below the locking pin when it is in
the unlocked position. Move the catch left or right aligning a suitable
locating hole directly below the locking pin.
4 –Installation

13 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Fitting the Letterbox Sentry (FG1 ONLY)
8. Mark the position of the catch screw holes on the door and fix in place
with the two self-tapping screws provided.
9. Test that the unit securely locks the letterbox by pressing the lock
button, and that it unlocks freely by pressing the unlock button,
ensuring that the locking pin inserts and withdraws from the catch
without fouling on it.
10. Insert the DC connector into the unit to supply power for the
accelerant sensor operation. This connector is a locking connector,
once inserted turn 90° clockwise to lock it in place.
Sensor Warming will show on the display for 30 seconds once DC
power is supplied.
11. Ensure there is enough slack in the cable to allow the letterbox flap to
fully open and close. Fit cable restraints to the door as required.
12. Ensure there is enough slack on the hinged side of the door to allow it
to fully open and close without pulling the cable.
13. Fix cable restraints as required to ensure the cable does not get caught
or trapped when opening and closing the door.
4 –Installation

14 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Setting the Time
Follow this procedure to set the time of the unit’s internal clock. You will need
to do this when first setting up the unit.
Press and hold the right-arrow button for 4 seconds until the display
shows ‘time’ followed by the current time of the unit’s clock.
Use the left and right arrow buttons to move the cursor over the hour
and minutes digits and use the plus and minus buttons to adjust the
values as required. AM and PM will change automatically when changing the
hour values.
Once adjusted to the correct time, press the left-arrow button to move
the cursor to left until the display clears and then shows the set time.
The unit’s clock has now been set to the time displayed.
Daylight Saving: Remember to adjust the time on the Letterbox Sentry to
align with changes in time, due to daylight saving.
5 –Setup
IMPORTANT

15 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Setting the Lock Time
Follow this procedure to change the time at which you want the unit to lock
the letterbox. The initial factory setting for the lock time is set to 5:00 PM.
Press and hold the down-arrow button for 4 seconds until the display
shows ‘Lock’ followed by the current lock time.
Use the left and right arrow buttons to move the cursor over the hour
and minutes digits and use the plus and minus buttons to adjust the
values as required. AM and PM will change automatically when changing the
hour values.
Once the desired lock time has been adjusted, press the left-arrow button
to move the cursor to left until the display clears and displays the current clock
time.
The unit’s lock time has now been stored.
5 –Setup

16 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Setting the Unlock Time
Follow this procedure to change the time at which you want the unit to unlock
the letterbox. The initial factory setting for the unlock time is set to 7:00 AM.
Press and hold the up-arrow button for 4 seconds until the display shows
‘unlock’ followed by the current unlock time.
Use the left and right arrow buttons to move the cursor over the hour
and minutes digits and use the plus and minus buttons to adjust the
values as required. AM and PM will change automatically when changing the
hour values.
Once the desired unlock time has been adjusted, press the left-arrow
button to move the cursor to left until the display clears and displays the
current clock time.
The unit’s unlock time has now been stored.
5 –Setup

17 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Tamper Alarm
The tamper alarm will trigger when:
1. The letterbox is locked and someone tries to gain access by using a
shock force.
2. The letterbox’s internal flap is in the fully open position (because
of something such as a newspaper keeping it open) and the locking
pin is in the locked position, i.e., not engaged in the catch.
The tamper alarm will sound for 2 minutes and can be silenced by a button
press. Pressing any button will show the cause of activation on the display.
If the tamper alarm is not silenced by a button press, the green PWR LED will
continue to flash every 2 seconds to alert the homeowner that there has been
an alarm activation.
Sensor Alarm (FG1 Only)
The sensor alarm will trigger if the unit detects flammable accelerant inside the
letterbox cavity. Upon activation, the alarm will sound for 2 minutes, and can
be silenced by a button press.
If the sensor alarm is not silenced by a button press, the green PWR LED will
continue to flash every 2 seconds to alert the homeowner that there has been
an alarm activation.
Pressing any button will show the cause of activation on the display.
6 –Alarms & Warnings

18 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Warnings
Indicates that the unit has lost its DC power supply since the last key press
(FG1 only). This could be the result of a power cut, or the DC adaptor not being
connected or powered.
The sounder will ‘chirp’ every 5 minutes to alert the homeowner.
Indicates that the DC power to the unit has been restored (FG1 only).
Indicates that the 6 AA batteries are running low on power and should be
replaced to ensure correct operation of the unit.
The red BATT LED will flash every 15 seconds and the sounder will ‘chirp’ every
5 minutes to alert the homeowner.
6 –Alarms & Warnings

19 LETTERBOX SENTRY TG1/FG1 (revision. 1.0)
Letterbox Sentry Ltd
St. Thomas House
Mansfield Road
Derby DE1 3TN
United Kingdom
Tel [phone]
EU Declaration of Conformity
We,
Audiotel International Ltd
25 Earlstrees Road
Corby
NN17 4AZ
United Kingdom
Tel No [phone]
Declare under our sole responsibility that the product:
Model name: Letterbox Sentry
included variants:
TG1:
FG1:
and all variations specified in the annex are in conformity with the provisions of the
following EU directive(s) (including all applicable amendments); and are designed and
manufactured with application of the harmonized standards.
Quality Assurance: The manufacturing organization is certified according to ISO 9001
CE was initially applied in: 2021
____________________________
Barry Stephen
Technical Director
18/03/2021