FUHR multitronic 881 Manual

Installation, operation and
maintenance instructions
These instructions are
to be passed on by the
fitter to the use
MBW20-GB/07.11-17
WWW.FUHR.DE
www.fuhr.dewww.fuhr.de

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1 Introduction 3
2 Important information/safety instructions 4
3 Delivery scope 5
4 Installation instructions 7
4.1 Routing and drilling operations 7
4.1.1 Cable-laying depending on the door design 8
4.1.2 Routing for the electronic drive unit in the door leaf 8
4.1.3 Routing for the tappet contacts in the door leaf 9
4.1.4 Routing for the control unit casing in the door frame 9
4.1.5 Routing for the switching power supply unit in the door frame 10
4.1.6 Drilling for the surface-contact device’s cable 10
4.1.7 Drilling for the 230 V power supply cable 11
4.1.8 Safety instructions 11
4.1.9 Screws for fixing individual components 11
4.2 Installation 12
4.2.1 Installation of the tappet contacts in the door leaf 13
4.2.2 Installation of the multipoint locking system in the door leaf 14
4.2.3 Installation of the cable guides, end caps and cover plates in the door leaf 15
4.2.4 Installation of the magnetic contact in the door frame 16
4.2.5 Installation of the surface-contact device in the door frame 16
4.2.6 Installation of the control unit casing in the door frame 17
4.2.7 Installation of the switching power supply unit (transformer) in the door frame 18
5 Commissioning 19
5.1 Fabricator’s function check 19
5.2 Commissioning on site 19
5.3 The radio keys (radio-controlled remote control) 20
5.4 Master radio key 20
5.5 Tuning in and deleting radio keys 21
5.5.1 Tuning in individual radio keys (max. 25) 21
5.5.2 Deleting individual radio keys (except the master key) 22
5.5.3 Deleting all radio keys (except the master key) 23
6 External connection options 24
6.1 Control unit casing circuit board 24
6.1.1 Application examples for circuit board assignment 26
6.2 The drive unit’s multi-functional jack 27
7 Maintenance and care 28
7.1 Contact device 29
8 Troubleshooting 30
8.1 Adjustment of strike plates/one-piece strike plates and latch changing 31
9 Technical data 32
9.1 FUHR multitronic radio key (remote control) 32
9.2 FUHR multitronic control unit with radio receiver 32
9.3 FUHR multitronic drive unit 32
9.4 FUHR multitronic switching power supply unit 33
10 Optional accessories 34
11 Wiring diagram 36
Contents
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Instructions in further languages, refer to www.fuhr.de

3
The FUHR multipoint locking system multitronic 881 locks doors electromotively – at all times and fully automated.
•Particularly reliable – strong and fast – due to two parallel high performance drives.
•This conserves energy as the door always closes imperviously.
•Enables secure locking of main entrance doors, apartment doors or back doors.
•Suitable for use with all door materials.
•All locking components can be operated either electromotively via a radio key, mechanically via the profile cylinder’s key, or
from the inside via the door lever handle.
•The electricity and data transfer is carried out from the door frame to the door leaf via a wireless transmission device. Spring-
loaded contact pins enable the door leaf to be unhinged for e.g. for decorating purposes at any time.
The standard locking and unlocking functions in detail:
Special functions are described in chapter 6.
Locking (closing):
All locking components are locked automatically 3 sec. after the door has been closed over. (This can however in
emergency situations - e.g. in the event of power failure - also be carried out mechanically by turning the key 4 times.)
Unlocking (opening) from the outside:
•By means of the radio key provided
•Alternatively by using the free-running profile cylinder’s key (depending on the drive-gear position; 4 turns!)
•Optionally by means of another access system e.g. transponder, code lock, finger print recognition, eye scanner or similar
(release signal via potential-free contact!)
Unlocking (opening) from the inside:
•Via the door lever handle as usual
•Alternatively by using the free-running profile cylinder’s key (depending on the drive-gear position; 4 turns!)
•Alternatively by means of the radio key provided
•Optionally via a domestic intercom system (6-12 V AC!)
•Optionally via a wireless wall-mounted push-button switch
•Optionally by means of another access system e.g. transponder, code lock, finger print recognition, eye scanner or similar
(release signal via potential-free contact!)
•As well as access control systems pertaining to contemporary BMS devices (Building Management Systems) (24 V DC pro-
cessor impulse!)
The locked mode is indicated by two brief acoustic signals. Simultaneously a red LED located on the control unit on the internal
side of the door indicates the locked mode. A green LED indicates the unlocked mode.
Do not operate the lever-handle during the electrical locking and unlocking procedure!
Further electrical connections are available for:
•Alarm systems
•Access control systems (fingerprint scanner, code lock, transponder etc.)
•Illuminated fixed pad handles/glazed units
•Electrically operated door openers (e.g. for disabled accessible doors = ‘barrier-free building’)
1 Introduction
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE
8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

4WWW.FUHR.DE
These instructions are aimed at door fabricators and contain important information regarding installation, commissioning and
operation pertaining to the FUHR multipoint locking system multitronic 881. Please read carefully prior to installation and com-
missioning. The points raised here provide supplementary information to the FUHR product information M3/3. The importance of
their compliance must be pointed out to builders and end-users. In the event of non-compliance with these imperative instructions,
faultless system operation cannot be warranted.
We assume that the installation as well as commissioning is carried out exclusively by professional staff.
Text passage denoting this symbol is relevant to safety and must be strictly adhered to.
The FUHR multipoint locking system multitronic 881 has been designed and manufactured taking safety-related regulations and
harmonised standards into account.
The safety of the FUHR multitronic product largely depends on its correct installation and regular
maintenance! The installation of the electronic components requires particular care, since abrasion points,
defective cables, damaged contacts, etc. affect security and can lead to the malfunction of the system. Please
ensure that all components are in perfect functioning condition prior to installation. Damaged or defective
components may not be used under any circumstances. Use the locking system only in technically
perfect condition! Malfunctions that impair security are to be eliminated immediately. Until the
malfunction has been eliminated, the drive unit is to be switched off and operated mechanically! The power
supply unit’s power feed is to be disconnected when working on the locking system and live components.
The FUHR multipoint locking system multitronic 881 has been engineered to be used in conjunction with the provided FUHR
multitronic components. We accept no liability for improperly installed systems and/or the use of non-original or non factory
approved system accessory parts. The modification of components or the use of non approved accessory components can cause
malfunctions. Material damage or personal injury resulting from non-compliance with the installation, operation and maintenance
instructions or inappropriate operation invalidates the warranty. We assume no liability for any consequential damage.
The FUHR multipoint locking system multitronic 881 must be protected from humidity. It is not suitable for areas with high humidity
and chemical substances.
The FUHR multipoint locking system multitronic 881 has been primarily designed for installation in main entrance doors,
apartment doors and back doors. The system with 2 hook bolts (type 3) has been tested and certified in accordance with
DIN EN 179. The variants with 2 round bolts (type 8) and with 2 hook and dual round bolts (type 11) have been tested and
certified in accordance with DIN EN 1125. For this purpose durability testing in the highest grade (grade 7) with 200,000
operations was carried out successfully.
When using in heavily frequented doors (more than 50 operations per day) e.g. in public or office building pro-
jects, it is necessary to use either of the two day-latch functions during busy periods (refer chapter 6.1).
All images, dimensions, product and design related information contained in these instructions represent the latest
developments regarding the FUHR multipoint locking system multitronic 881 at the time of printing. This product is subject to a CIP
(continuous improvement process) and is constantly enhanced to reflect the latest technology. For the purpose of your satisfaction,
we reserve the right to implement changes to this product. Model and product claims cannot be lodged.
The latest version of these instructions is published on our website www.fuhr.de.
The installation steps depicted on the following pages serve as a schematic diagram. Due to the numerous profiles available on the
market, there may be slight deviations in specific points. It is therefore imperative that the profile-related routing drawing provided
with the FUHR multitronic set is adhered to. Please contact your sales partner or the manufacturer in the event of discrepancies or
queries.
The indicated sequence in these installation instructions is exemplary. The sequence may be varied if required.
IMPORTANT!
All components contained in the set (particularly the control unit and the radio key) are coordinated and should not be
used in conjunction with other sets.
2 Important information/safety instructions

5
One-piece keep or individual keeps
Profile related version,
incl. magnetic contact
Multipoint locking system multitronic 881
incl. electromotive drive unit
Control unit with radio receiver and visual locking
indicator
Preassembled cable connectors (length 200 and 300 mm)
Switching power supply unit (transformer)
Profile related version,
230 V AC input/12 V DC output, Cable connectors 230 V
(length 3000 mm - surface- mounted cable), earth/ground
cable (length 400 mm) and 12 V (length 200 mm)
preassembled
Surface-contact device for electricity and data transfer
Preassembled cable connector (length 250 mm)
Tappet contacts for electricity and data transfer
Cable connector (length 4000 mm), with preassembled
multi-functional jack
3 Delivery scope
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE
8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

6WWW.FUHR.DE
Radio key
to be handed over to the end user;
3-channel radio key as remote control,
1 pc. with red buttons = master key
2 pcs. with turquoise buttons
Cover plate, cable guides and end caps
for safe cable-laying (only for doors with Euro groove);
2 m. cover plate
6 pcs. double cable guides
2 pcs. end caps
Cable protection sleeves
3 pcs.
Profile-related routing drawing

7
The routings for the FUHR multipoint locking system multitronic 881 are carried out in accordance with the routing drawing
provided.
In addition to the conventional routings
for FUHR multipoint locking sys-
tems, for example on multisafe 855,
only 2 additional routings in the door
leaf and the door frame are required.
These installation instructions there-
fore only describe the additional routing
and drilling operations for the electronic
locking mechanism.
4 Installation instructions
4.1 Routing and drilling operations
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE
8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

8WWW.FUHR.DE
Version A – e.g. for PVC doors:
Cable-laying in the Euro groove.
Deburr the cable feedthrough hole
and insert the cable protection sleeves
provided.
Version B – e.g. for aluminium doors:
If the cable is to be laid in the glazing rebate’s Euro groove, a
Ø 10 mm drill hole is to be drilled in the glazing rebate area.
Deburr the cable feedthrough hole
and insert the cable protection sleeve
provided.
The 230 V electricity cable is a surface-mounted cable.
Conduit must be used for concealed cabling. The door
frame must be earthed/grounded.
The cable-laying for version A is described in the
following installation steps.
Routing in compliance with the separate routing drawing
between the main lock and the bottom additional locking
point
4.1.1 Cable-laying depending on the door design
4.1.2 Routing for the electronic drive unit in the door leaf

9
Routing in compliance with the separate routing drawing on
the hinge side of the door leaf
Make sure that the surface-contact device
and the tappet contact device are aligned
accurately horizontally. Refer to chapter
4.1.6.
Routing in compliance with the separate routing drawing on
the hinge side of the door frame face (on the inside of the
building)
4.1.3 Routing for the tappet contacts in the door leaf
4.1.4 Routing for the control unit casing in the door frame
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

10 WWW.FUHR.DE
Routing in compliance with the separate routing drawing on
the hinge side of the frame profile
Drilling in compliance with the separate routing drawing in
the frame profile, laterally at the same height as the tappet
contact device
Make sure that the surface-contact device
and the tappet contact device are aligned
accurately horizontally. Refer to chapter
4.1.3.
4.1.5 Routing for the switching power supply unit in the door frame
4.1.6 Drilling for the surface-contact device’s cable

11
Drilling in compliance with the separate routing drawing on
the reverse side of the profile within the routing to accommo-
date the switching power supply unit
This drill hole must deburred carefully
at both ends! Insert the cable protection
sleeve provided in the drill hole to protect
the 230 V cable. The cable must be pro-
tected against abrasion and securely fixed
in order to prevent tractive forces.
All routing and drilling work must be deburred carefully. The cables must be securely fixed in this area
in order to prevent abrasion. All routing and drilling swarf must carefully removed from the profiles.
4.1.7 Drilling for the 230 V power supply cable
4.1.8 Safety instructions
Conventional fenestration screws with a maximum screw head diameter of 7 mm and a maximum screw
diameter of 4.5 mm may be used. The PVC components (switching power supply unit, surface-contact
device etc.) are to be fixed with screws with a maximum length of 20 mm. To fix the metal components
(faceplates, keeps etc.) select a screw length according to the requirements.
Depending on the profile material, screw holes may have to be pre-drilled with an appropriate drill.
It is imperative that all screws are hand-tightened, as some components are made
of PVC and may be damaged by the excessive force that a cordless screwdriver can
exert.
It is essential that the surface-contact device and the tappet contact device are
aligned accurately.
4.1.9 Screws for fixing individual components
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

12 WWW.FUHR.DE
The installation requires exceptional care. This applies particularly to the electronic compo-
nents, as routing and drilling swarf, abrasion points and defective cables can lead to the device
malfunctioning.
Avoid positioning fixing materials (e.g. frame-fixing screws) in areas where electronic
components are located!
4.2 Installation

13
The electricity and data transfer control unit for
FUHR multitronic may be used on left or right
handed doors.
On DIN left-handed doors the tappet contact is installed
as provided.
On DIN right-handed doors the cable is placed in the guide
channel on the rear side of the casing.
Check the polarity (plus/minus) before
installing the tappet contacts, refer to
the components’ identification marking:
DIN right-handed = Plus symbol on
the bottom
DIN left-handed = Plus symbol on
the top
1. Remove the silver covers from the tappet contact device.
2. Insert the tappet contact device into the door leaf’s routed
recess.
3. Lay the cable with the green plug in the channel above the
door.
4. Screw-fix the casing to the door leaf profile.
5. Replace the covers.
6. Insert the green plug in the additional locking point’s top
routing and lead it down to the routed recess for the elec-
trical drive unit.
Note: DIN right-handed = doors with the
hinges located on the right hand side of
the door (viewed from the inside).
4.2.1 Installation of the tappet contacts in the door leaf
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DeliveRy sCope
8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

14 WWW.FUHR.DE
1. Connect the tappet contact device’s green plug to the
corresponding contact plug on the electrical drive unit.
2. Screw-fix the plugs with a small screwdriver.
PLEASE NOTE! It is imperative to carry out
this screw-fixing. The screw joint war-
rants permanent contact for the electricity
and data transfer, and safeguards against
vibration and shock.
3. Insert the cable and FUHR multipoint locking system
multitronic into the routed recess.
In doing so, ensure that the cables are
neither kinked, trapped nor damaged.
4. Screw-fix the multipoint locking system’s faceplate. Fix
the screws in a straight manner in order to prevent the
connecting-rods being jammed by the screws.
PLEASE NOTE! The connecting-rodshave
to be able to move unhindered. Friction
caused by screws or too narrow profile
guide grooves cause operational malfunc-
tion.
4.2.2 Installation of the multipoint locking system in the door leaf

15
4.2.3 Installation of the cable guides, end caps,
and cover plates in the door leaf
1. Fold the provided PVC cable guides for the profile
corners in half and snap them apart for the centre profile
area.
2. Clip in each of the cable guides into the top door leaf cor-
ners, and depending on the door width and height, also
in the Euro groove channel.
3. Lay the cable through the cable guide and loop the sur-
plus cable between two cable guides.
4. Crop and screw fix the cover plate according to the door
width or height.
Make sure that the screws are screw
fixed through the cable guides’
elongated holes. Non-compliance leads to
damaged cables.
5. Put on the end caps and screw fix through the cable
guides.
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

16 WWW.FUHR.DE
1. Install the magnetic contact in accordance with the sup-
plied routing drawing. The exact drawing dimension must
be adhered to in order to warrant perfect contact with the
electromotive drive’s reed switch.
Make sure that the reed switch and mag-
net are aligned horizontally at the same
height.
For one-piece keeps:
The installation of the one-piece keep is to be carried
in compliance with routing drawing provided. The
magnetic contact is already integrated.
1. Remove the silver covers.
2. Feed the surface-contact device’s 3-core cable (red,
black, white) through the frame profile’s drill hole and
back outside through the control unit casing’s routed
opening. Pull the cable all the way through the routed
opening so that the surface-contact device is located level
on the profile.
3. Screw fix the surface-contact device to the frame
profile.
4. Replace the covers.
In order to ensure proper contact and
durable operation, the contact surface
has been pre-treated with contact
lubricant. Please do not remove this
lubricant film! Please adhere to the
regular maintenance instructions in
compliance with chapter 7.1.
4.2.4 Installation of the magnetic contact in the door frame
4.2.5 Installation of the surface-contact device in the door frame

17
4.2.6 Installation of the control unit casing in the door frame
1. Remove the silver cover before installing the control unit
casing. To do so, carefully insert a small screwdriver into
the cover cap’s recess and pry it out.
2. Connect up the surface-contact device’s 3-core cable
plug (red, black, white) with the control unit casing’s
3-core cable plug. The plug clicks in audibly.
3. Insert the 2-core control unit casing cable into the routed
recess, guide the cable downwards, and exit through the
switching power supply unit’s routed recess.
4. Carefully feed the control unit casing’s cable back into the
frame profile so that the control unit casing fits comfor-
tably in the routed recess.
Please ensure that the cables are neither
kinked, trapped nor damaged by sharp
profile edges.
5. Screw fix the control unit casing into the frame profile.
Make sure that the cables are not
damaged when screw fixing.
6. Replace the control unit casing’s cover cap.
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

18 WWW.FUHR.DE
The FUHR multitronic switching power supply unit can be
used for left handed as well as right handed doors.
On DIN right-handed doors the switching power supply
unit is installed as provided.
On DIN left-handed doors the top profile-related end cap is
swopped with the bottom one.
1. Remove the silver covers.
2. The green/yellow earth/ground cable is to be connec-
ted electrically conducting with the door’s metal frame.
3. Connect up the control unit casing’s 2-core cable (red/
black) with the switching power supply unit’s cable coun-
terpart. The plug clicks in audibly.
4. Feed the cable carefully back into the frame profile
ensuring that the switching power
supply unit fits comfortably in the
routed recess.
Depending on the profile type, loop the cable at the
bottom of the profile.
5. Guide the 230 V cable out through the deburred drill
hole at the bottom of the profile (through the inserted
cable protection sleeve). Leave a spare cable loop in the
profile in order to be able to remove the switching power
supply unit at a later time. Fix the rolled up cable to resist
tractive forces and fasten it to the outside of the door
frame using a cable tie.
6. Screw fix the switching power supply unit to the frame
profile.
Make sure that the cables are not
damaged when screw fixing. Earth/ground
the frame before commissioning.
7. Replace the covers.
4.2.7 Installation of the switching power supply unit (transformer)
in the door frame

19
1. Install the door in the wall opening in the usual manner, guiding the 230 V cable to the
internal side of the wall. Make sure that fixing materials (e.g. wall anchors) are not located where
the electronic components are.
2. An electrician must connect up the 230 V cable to the power supply. The door frame’s earthing/
grounding is to be professionally checked. Conduit must be used for 230 V concealed cabling.
3. In order to be able to warrant the power supply of all electronic components, also in the case
of a network operator’s power failure, escape doors in accordance with DIN EN 179 and
DIN EN 1125 should be equipped with an emergency power supply!
1. After all of the FUHR multitronic com-
ponents have been installed, check
that the door leaves and frames are
aligned parallel.
2. Install a profile cylinder with free-running mechanism
and forced decoupling in the centre lock in accordance
with the certificates of EN 179/EN 1125 resp. with the
marking ‘FZG’. A current list of the non-restricted cylin-
ders which are approved with our multipoint locks can be
found on our website at www.fuhr.de.
3. Subsequently connect the 230 V cable to the mains vol-
tage by means of a two-pin earthed/grounded plug for
testing purposes (only by qualified personnel).
4. The green LED will light up as soon as operating
voltage is present. 3 seconds after the door is closed (the
reed switch is triggered by the magnetic contact); the
lock device will lock automatically.
5. In order to test all functions, the door should be opened
and locked several times via the drive unit, the profile
cylinder, and via the lever-handle. In the event of any
problems arising, please refer to chapter 8.
6. If the FUHR multitronic lock is fully operational, the two-
pin earthed/grounded plug can be removed and the door
can be despatched.
5 Commissioning
5.1 Fabricator’s function check
5.2 Commissioning on site
1 INTRODUCTION
2 IMPORTANT
INFORMATION
3 DELIVERY SCOPE8 TROUBLE-
SHOOTING
4 INSTALLATION
INSTRUCTIONS
5 COMMISSIONING
6 EXTERNAL
CONNECTION
OPTIONS
7 MAINTENANCE
AND CARE
9 TECHNICAL
DATA
10 OPTIONAL
ACCESSORIES

20 WWW.FUHR.DE
The FUHR multitronic is supplied with 3 radio keys (radio-
controlled remote controls). All radio keys are copy protected
by means of a ‘rolling code system’.
The radio key with the red buttons is defined as the master
key and is needed to tune in the other radio keys. Up to 25
radio keys can be tuned in.
The radio keys are equipped with a three channel radio-
controlled remote control. The individual buttons
(channels) are allocated as follows:
Centre button – Main door – Tuned in on site
Left button – Free for e.g. garage door
Right button – Free for e.g. garden gate
The radio key is equipped with a battery-operated indicator
light. The radio keys are particularly energy saving. One bat-
tery suffices for approx. 50,000 operations.
Battery change:
1. Open the radio key casing with a coin.
2. Slide the battery out.
3. Insert the new battery (type: CR 2032). Note that the
Plus symbol is pointing upwards.
4. Press the radio key casing together again.
Important!
In order to ensure that the door can be
opened in the event of an emergency (e.g.
power failure), the profile cylinder key
should always be carried in addition to the
radio key.
The radio key with the red buttons serves as the master key.
Only this key has the ability to tune in or delete other radio
keys. The master radio key’s middle button has already been
tuned in at the factory to the control unit within the same set.
The master key cannot be deleted or
switched at a later stage.
The master key should therefore be
kept safely, as additional keys cannot
be tuned in or deleted should it be lost.
5.4 Master radio key
5.3 The radio keys (radio-controlled remote control)