BIFFI F02 manual 

INSTRUCTION HANDBOOK MAN 652
F02 Quarter-turn
Electric actuator
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Section 624/1
2© Copyright by BIFFI Italia. All rights reserved.
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F02 Quarter-turn Electric Actuators
instruction and operating manual
Note:
BIFFI Italia has taken every care in collecting and verifying the documentation contained in the
instruction and operating manual. The information herein contained is a reserved property of Biffi Italia.
0 31/05/05 First Issue A. Ghiadoni G. Alfieri
Rev. Date Description Prepared Approved

© Copyright by BIFFI Italia. All rights reserved.
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F02 Quarter-turn Electric Actuators
Instruction and operating manual
INDEX
1. GENERAL SAFETY INSTRUCTIONS..........................................4
2. MACHINE DESCRIPTION....................................................................7
3. STORAGE AND PRE-INSTALLATION.......................................9
4. INSTALLATION..........................................................................................11
5. LUBRICATION.............................................................................................20
6. ACTUATOR SETTING AND CONFIGURATION...............20
7. MAINTENANCE AND TROUBLE-SHOOTING...................27
8. PARTS LISTS AND DRAWINGS................................................31
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F02 Quarter-turn Electric Actuators
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F02 Quarter-turn Electric Actuators
instruction and operating manual
1. GENERAL SAFETY INSTRUCTIONS
1.1 Manufacturer
Manufacturer with respect to Machinery Directive 98/37 is Biffi Italia, as specified on the
machinery label.
1.2 Intended Use
The F02 electric actuators covered in this Instruction and Operating Manual are designed for
the operation of any kind of quarter-turn industrial valves (i.e., ball, butterfly, plug and control
valves) used in a wide range of applications ranging from heavy industrial, chemical,
petrochemical plants, waterworks, water pipelines, waste paper plants and power plants to
food, brewing and heating, ventilation, air conditioning, etc.
F02 actuators are produced by Biffi Italia and identified by a label with a product designation
code.
Biffi Italia will not be liable for any possible damage or physical injury resulting from use in
other than the designated applications or by lack of care during installation, operation,
adjustment and maintenance of the machine. Such risks lie entirely with the user. Depending
on the specific working conditions, additional precautions may be requested.
Considering that Biffi Italia has no direct control over particular applications, operation or
maintenance conditions, it is the operator’s responsibility to comply with all applicable safety
rules.
Please inform Biffi Italia urgently if you face unsafe situations not described in this IOM. It is
the sole responsibility of the operator to ensure that the local health and safety regulations
are adhered to.
The noise emitted by F02 electric actuators during normal operation is less than 40 dB (A)
with peak value equal to 85 dB (C). Standard references: ISO 11202 (1st edition, 1995-2-15).
Warning: It is assumed that the installation, setting, commissioning,
maintenance and repair works are carried out by qualified
personnel and checked by responsible Specialists.
Warning: Any repair work other than the operations outlined in this IOM
will be strictly reserved to qualified BIFFI ITALIA personnel or
to personnel directly authorised by the Company itself.
F02 electric actuators are designed in accordance with the applicable International Rules
and Specifications, but the following Regulations must be observed in any case:
• the general and safety regulations
• the plant specific regulations and requirements
• the proper use of personal and protective devices (glasses, clothing, gloves, etc)
• the proper use of tools, lifting and transport equipment.
Warning: The electronic parts of the F02 and all the options can be
damaged by a discharge of static electricity. Before you start,
touch a grounded metal surface to discharge any static
electricity.

1.4 Manufacturer’s Liability
Biffi Italia declines all liability in the event of:
• use of the actuator in contravention of local safety at work legislation
• incorrect installation, disregard or incorrect application of the instructions provided on the
actuator nameplate and in this manual
• modifications without Biffi’s authorisation
• work done on the unit by unqualified or unsuitable persons
1.5 Identification
1.5.1 WATER-, DUST-PROOF VERSION
F02 actuators are designed and manufactured according to EN 60529 standards.
Specific types of protection are printed on the label, as follows:
• IP 66/68
• NEMA 4/4X/6 according to NEMA ICS6/NEMA 250
1.5.1.1 Label for Application in Water-, Dust-proof Areas
Marking description:
1.5.2 EXPLOSIONPROOF VERSION
The version of F02 suitable for installation in hazardous areas is designed and manufactured
according to EN50014, 50018, 50019, 50020, EN50281-1-1 standards.
Different types of protection are available, depending on the requirements of the installation
site.
Specific types of protection are printed on the label, as follows:
•ATEX EEx de IIB T4 with enclosures in “explosionproof” version and terminal board
enclosure in “increased safety” version
A Manufacturer
B Product model
C Nominal output torque value
D Biffi product code
E Serial number
F Stroking time range
G Power supply data
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F02 Quarter-turn Electric Actuators
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1.3 Terms and conditions
Biffi Italia guarantees each single product to be free from defects and to conform to current
goods specifications. The warranty period is one year from the date of installation by the first
user, or eighteen months from the date of shipment to the first user, whichever occurs first.
No warranty is given for products which have been subject to improper storage, improper
installation, misuse, or corrosion, or which have been modified or repaired by unauthorised
personnel.
Repair work due to improper use will be charged at standard rates.
Max current absorbption in ampere
Enviromental data
Actuator duty
Weatherproof protection range
Weatherproof certificate reference
Manufacturer details
Year of construction
H
I
L
M
N
O
P

I
L
M
N
O
P
Q
R
S
•NEC 500 (FM/CSA approvals) for Class 1 div. 1 groups C & D
•NEMA 7 and NEMA 9
The above versions of F02 prevent the risk of explosion in the presence of gas or ignitable
dusts.
F02 actuators have IP 66/68 protection degree in accordance with EN60529.
Warning: Whenever F02 actuators must be installed in an HAZARDOUS
AREA as defined by the applicable rules, it is mandatory to
check whether the actuator nameplates indicate their
suitability to an hazardous area, and the appropriate
protection degree. Maintenance and repair works must be
carried out by qualified personnel and checked by responsible
specialists.
1.5.2.1 Label for Application in Hazardous Areas
1.6 Applicable Standards and Regulations
EN 292/1: Safety of machinery - Basic concepts, general principles for design. Part 1-Basic
terminology, methodology.
EN 292/2: Safety of machinery - Basic concepts, general principles for design. Part 2-
Technical principles and specification.
En 60204/1: Electrical equipment of industrial machines. Part 1- General requirements.
EEC 98/37: Machinery directive.
EEC 73/23: Low voltage directive.
EEC 89/336: EMC Directive
ATEX 94/9 EEC Directive
1.7 Extract from the Standard
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F02 Quarter-turn Electric Actuators
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Type of HazardZone Categories according to 94/9/CE
Directive
Gas, mists or vapours Zone 0 1G
Gas, mists or vapours Zone 1 2G
Gas, mists or vapours Zone 2 3G
Dust Zone 20 1D
Dust Zone 21 2D
Dust Zone 22 3D
A Manufacturer
B Product model
C Nominal output torque value
D Biffi product code
E Serial number
F Stroking time range
G Power supply data
HMax current absorbption in ampere
Enviromental data
Actuator duty
Explosionproof protection range
Weatherproof protection range
Atex certificate reference
Manufacturer details
Year of construction
Notified body for Atex quality assurance (Ineris)
Atex marking

2. MACHINE DESCRIPTION
2.1 General
The F02 is an electric quarter-turn actuator suitable to operate a valve in a 90° manoeuvre.
The actuator introduces innovative solutions to provide maximum flexibility in terms of
voltage supply, operation speed and torque options.
2.2 Principle of operation
The electric motor drives the input to an epicyclical gear train via a spur reduction. The input
member of the epicyclical gear train carries a single compound planet gear which meshes
with two internally toothed gears, one being the fixed annulus and the other being the output
gear. The fixed annulus gear has external helical teeth meshing with a transversely fixed
worm gear. Since the annulus cannot drive the worm gear this provides a fixing point for the
annulus, and since the worm gear can drive the annulus, a means of manual operation is
provided which needs no declutch.
An end-of-travel-position detection device is operated via a position sensor directly linked to
the output shaft. The valve position is continuously monitored in electric mode by means of
a position sensor directly connected to the F02 output drive.
2.3 Electrical operation
- Control command “open”: counter-clockwise or clockwise rotation (selectable on the local
panel) moves the valve to a completely or partially open position;
- Control command “closed”: clockwise or counter-clockwise rotation (selectable on the
local panel) moves the valve to a completely or partially closed position;
Control system details are shown in the specific wiring diagram.
2.4 Manual operation
To be used in case of power supply failure or during actuator setting.
The manual operating device is completely independent of the motor drive and can be
operated at any time, whether or not the motor is running, without danger to the operator.
The handwheel does not rotate during power operation.
To close the valve turn the handwheel clockwise.
To open the valve, turn the handwheel counter-clockwise.
Important: Handwheel rotation
In standard applications clockwise rotation of the handwheel
moves the valve to close position and counter-clockwise
rotation moves the valve to open position.
Different operation must be clearly indicated on the
handwheel.
7
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2.5 Description of the Main Parts
The F02 actuator consists of five main parts:
Base Flange: for coupling the actuator to the valve;
Terminals enclosure: for power and signal cable connection through four available cable
entries;
Mechanical Gearing: internal epicyclical gear reduction, which increases the torque of the
electric motor;
Control Unit: integral control unit inclusive of electric motor with the relevant driver, power
and logic electronic card. By way of the mechanical gearing, the electric motor operates
the valve in normal working conditions;
Manual Override: for actuator manual operation in case of power supply failure or during
actuator setting.
Control unit
Local position indicator
Base flange
Mechanical gearing
Manual override
Cable entries
Terminals enclosure

3. STORAGE AND PRE-INSTALLATION
Important: Not performing the following procedures will invalidate the
product guarantee.
3.1 Checks to be carried out when the actuator is received
First of all check if the data on the nameplate (Model, Serial Number, Nominal Torque,
Nominal Voltage, Protection degree, Operating Speed, Protection Class, etc.) correspond to
the expected product data.
If the actuator is received already assembled onto the valve, the setting of the mechanical
stops and of the electric end-of-travel should have been already done during actuator
assembly onto the valve. An additional check is anyway recommended to verify that all the
requested settings have been completed as indicated in the present Instruction and
Operating Manual.
If the actuator is received separately from the valve, the setting of the mechanical stops and
of the electric end-of-travel must be checked and, if necessary, carried out while assembling
the actuator onto the valve. In any case, all the setting operations described in this
Instruction and Operating Manual must be carried out.
Check that the actuator was not damaged during transport: in particular, inspect the local
position indicator area glass. If necessary, repair all damages to the paint-coat, etc.
Check that the fitted accessories comply with those listed in the order acknowledgement
and the delivery note.
3.2 Storage procedure
3.2.1 GENERAL
The actuators leave the factory in perfect working conditions and with an excellent finish
(these conditions are guaranteed by an individual inspection certificate); in order to maintain
these characteristics until the actuator is installed on site, it is necessary to observe a few
rules and take appropriate measures during the storage period.
The base version of BIFFI actuators is weatherproof to IP 66/68. This condition can only be
maintained if the units are correctly installed and connected on site, and if they were
previously correctly stored. The standard plastic plugs used to close the cable entries are
not weatherproof, they just prevent the entry of undesired objects during transport.
3.2.2 STORAGE FOR A BRIEF PERIOD (LESS THAN ONE YEAR)
3.2.2.1 Indoor storage
- Make sure the actuators are kept in a dry place, laid on a wooden pallet (not directly on the
floor surface) and protected from dust;
- in very humid environments, a moisture absorbent desiccant packet should be introduced
in the motor enclosure. (Desiccant is not included in the actuator package).
3.2.2.2 Outdoor storage
- Make sure the actuators are protected from the direct action of weather agents (protection
by a canvas tarp or similar);
- place the actuators on a wooden pallet, or some raised platform, so that they are not in
direct contact with the ground, and protected from dust; 9
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F02 Quarter-turn Electric Actuators
instruction and operating manual

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F02 Quarter-turn Electric Actuators
instruction and operating manual
- in very humid environments, a moisture absorbent desiccant packet should be introduced
in the motor enclosure. (Desiccant is not included in the actuator package);
- if the actuators are supplied with standard plastic plugs, remove them from the cable
entries and replace them with weatherproof plugs.
3.2.3 LONG PERIOD STORAGE (MORE THAN ONE YEAR)
3.2.3.1 Indoor storage
In addition to the instructions at point 3.2.2.1):
- if the actuators are supplied with standard plastic plugs, replace them with weatherproof
plugs;
- the coupling parts (i.e. flange, etc.) must be coated with a protective oil or grease;
(if possible, blank off the flange by a protection disk);
- in case the F02 is provided with an alkaline battery, remove it and store it in a dry and
clean place.
3.2.3.2 Outdoor storage
In addition to point 3.2.2.2):
- if the actuators are supplied with standard plastic plugs, replace them with weatherproof
(metal) plugs;
- the coupling parts (i.e. flange, etc.) must be coated with a protective oil or grease;
(if possible, blank off the flange by a protection disk);
- check the actuator general conditions, paying particular attention to the terminal board;
- in case the F02 is provided with an alkaline battery, remove it and store it in a dry and
clean place.

4. INSTALLATION
4.1 Checks to be performed before installation
To assemble the actuator onto the valve proceed as follows:
• Check that the coupling dimensions of the valve flange and stem, or of the relevant
extension, meet the actuator coupling dimensions.
• The electrical supply cables must be suitable for the power rating (see the test certificate
delivered with the actuator);
• Gather the necessary tools for the assembly and setting of the actuator controls;
• Lubricate the valve stem with oil or grease to make the assembly easier: pay attention not
to contaminate with lubricant the flange surfaces which transmit the actuator torque.
• Clean the valve flange and remove anything that might prevent a perfect adherence to the
actuator flange and especially all traces of grease.
• Install the actuator onto the valve so that the shaft output drive enters the groove of the
stem extension. This coupling must take place without forcing and only with the weight of
the actuator. When the actuator output shaft and the valve stem are connected, check the
holes of the valve flange. If they do not meet with the holes of the spool piece flange or the
stud bolts screwed into them, the actuator shaft output drive must be rotated. Actuate the
manual override until coupling is made possible.
Tighten the nuts of the connecting stud bolts evenly.
• If possible, operate the actuator to verify it moves the valve smoothly.
If a long storage period has occurred, before reinstalling the actuator, please:
• check the status of the O-ring seals;
• check the installation of the plugs or cable glands on the cable entries;
• check whether the enclosure covers or the actuator body are cracked or broken;
• put the battery back into place.
4.2 Working condition
Standard F02 actuators are suitable for the following environment temperatures:
-25°C to +70°C (-13°F to +158°F) with 80% humidity
Special versions are available for extreme environment temperatures:
• -40°C to +70°C (-40°F to +158°F) with 80% humidity
• -25°C to +70°C (-13°F to +158°F) with 100% humidity
Important: Check the "ambient temperature range" embossed on the
nameplate, for the correct utilisation with respect to the
ambient temperature. Installation in ambient with temperature
range outside the specified values will invalidate the warranty.
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F02 Quarter-turn Electric Actuators
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Overview of one type of insert and drive details of the F02.
4.3 Coupling block
The electric actuator is delivered with drive details and flange in accordance with the
technical characteristics required by the Customer, ready to be installed onto the valve.
Only one insert is included in the actuator package delivered to end users.
4.4 Installation of the F02 unit onto a valve
Move the valve to the completely open position.
Manually bring the F02 to the completely open position (verify the local mechanical indicator)
and check the rotation direction of actuator and valve. The actuator should be mounted for
counter-clockwise rotation to open and clockwise to close.
Warning: Never lift the valve/actuator assembly without securing slings
to both the valve and the actuator
Warning: Never use the handwheel to lift the actuator

The F02 unit can be installed onto the valve in two different ways:
Direct mounting: insert the valve shaft into the actuator bottom flange,
taking care to correctly connect the insert. Fix the screws on the
valve flange to the actuator coupling block.
Bracket mounting: install the bracket and the adapter onto the valve; then insert the
valve shaft into the actuator bottom flange, taking care to correctly
connect the insert.
Fix the screws between the bracket and the valve flange and the
actuator coupling block.
4.5 Manual operation
F02 electric actuators are supplied with a handwheel for manual override as standard, to
operate the actuator in case of power supply failure or during setting.
The handwheel is always engaged. For safe operation, the handwheel does not rotate
during electric operation.
Turn the handwheel clockwise to close and counter-clockwise to open.
During manual operation, check the actuator manoeuvre on the local mechanical indicator.
Warning: Do not manually operate the actuator with devices other than
the handwheel. Using cheater bars, wheel wrenches, pipe
wrenches, or other such devices on the actuator handwheel
may cause serious personal injury and/or damage to the
actuator or valve.
Important: Handwheel rotation
In standard applications clockwise rotation of the handwheel
moves the valve to close position and counter-clockwise
rotation moves the valve to open position.
Different operation must be clearly indicated on the
handwheel.
13
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F02 Quarter-turn Electric Actuators
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Manual operation.

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4.6 Setting of the angular stroke: mechanical stops
It is important for the mechanical stops to end the angular stroke at both extreme valve
positions (fully open and fully closed).
The setting of the angular stroke is performed by adjusting the travel stop screw mounted
on the actuator housing.
For the adjustment of the stop screw proceed as follows:
• Loosen the lock nut.
• Screw 1: open;
To set the mechanical stop in opening, manually bring the actuator to the completely open
position, then turn screw 1 clockwise.
• Screw 2: close.
To set the mechanical stop in closing, manually bring the actuator to the completely close
position, then tighten screw 2.
If the actuator angular stroke is stopped before reaching the end position (fully open or
closed), proceed as follows:
- unscrew the stop screw by turning it anticlockwise until the valve reaches the correct
position;
- when unscrewing the stop screw, keep the lock nut still with a wrench so that the sealing
washer does not withdraw together with the screw;
- tighten the lock nut.
If the actuator angular stroke is stopped beyond the end position (fully open or closed),
proceed as follows:
- screw the stop screw by turning it clockwise until the valve reaches the correct position
- tighten the lock nut.
Setting of the mechanical stop.

Removal of the terminal board enclosure.
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F02 Quarter-turn Electric Actuators
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4.7 Electrical connections
Before powering the actuator, check that the supply voltage details on the nameplate are
correct for the plant. Access to terminals for electrical connections is through the terminal
cover and for commissioning is through the control unit cover.
Warning: After electrical on-field installation, please make sure all
removal of the cover assembly is done in total observance of
the applicable safety rules.
Warning: All the accessories (cable glands in particular) must be
certified according to the requirements of the installation area
and the relevant applicable regulations.
Warning: Setting must be done while the actuator is powered on. As a
consequence, all setting operations must be carried out by
specifically qualified personnel for operations on powered
electronic cards.
4.8 Plant requirements
Protection devices (over-current breakers, magneto-thermal switches or fuses) must be
provided by the Customer to protect the main lines in case of motor over-current or loss of
insulation between phases and earth.
4.9 Removal of the terminal board enclosure
Using a 5 mm Allen key, loosen the four screws and remove the cover.
Warning: Pay attention not to damage the joint surfaces of
the cover.

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F02 Quarter-turn Electric Actuators
instruction and operating manual
4.10 Cables connections
Before applying voltage to the F02 check that the electrical parameters (supply voltage and
current) shown on the nameplate and on the attached wiring diagram are correct for the
installation.
Important: All the accessories which equip the F02, in particular the cable
glands, must be certified according to the Standard Directive
and specific Rules applying to the products.
Warning: Do not remove earth connection X while connecting the
actuator to plant earthing.
Remove the plugs from the cable entries.
For electrical connections use components (cable glands, cables, hoses, conduits) which
meet the requirements and the applicable Codes of the plant specifications (mechanical
protection and/or explosionproof protection). Screw the cable glands (or the conduits) tightly
into the threaded entries, in order to guarantee the weatherproof and explosionproof
protection (when applicable).
Insert the connection cables into the electrical enclosures through the cable glands (or
conduits) and, according to the Wiring Diagram in the main terminal board enclosure,
connect the electrical supply, the control and the signal cables to the actuator, by linking
them to the terminal blocks termination as per diagram.
Replace the plastic plugs of the unused cable entries by metal ones, to guarantee perfect
weatherproof tightness and to comply with the explosionproof protection codes (where
applicable).
Once the connections are completed, check that the controls and signals work properly.
Overview of the electrical connections.
Earth connection X

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F02 Quarter-turn Electric Actuators
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Two studs, one internal and one external, are provided to meet all local electric and safety
regulations.
Terminate the ground connections at least to the external stud marked GROUND.
Connect the motor supply cable previously sized in accordance with:
- the absorbed current correspondent to the actuator nominal torque with the torque limiting
device set at 100 percent (see the test certificate attached to the actuator)
- the applicable plant and safety norms.
4.11 Base wiring diagram
Output contact rating
• 5A @ up to 240 VAC
• 5A @ up to 30 VDC
• 0,5A @ 120 VDC

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4.12 Cable entries
The sealing of cables and conduit entries should be carried out in accordance with National
Standards or the Regulatory Authorities that have certified the actuators. This is particularly
true for units that are certified for use in hazardous areas where the method of sealing must
be to an approved standard, and cable glands, reducers, plugs and adapters must be
approved and separately certified.
Important: • To prevent any water infiltration through the cable conduits,
make sure the cable glands have the minimum protection
degree required by the plant
• If rigid conduits are used, we suggest placing a flexible pipe
connection between the conduit and the terminal board
In order to properly connect the cables, remove the cable entry plugs and make all the
necessary connections.
To guarantee the proper weatherproof and explosionproof fit, screw the cable glands tightly
and block them with a thread sealant. The use of a thread sealant is necessary in case of
explosionproof application.
If some parts of the cable glands have been removed while working on the cable entries, put
them back into place in order to avoid losing the dismantled parts.
Unused entries:
• For explosionproof construction: unused entries must be plugged with metal
explosionproof plugs and blocked with a thread sealant;
• For weatherproof construction: replace the standard plastic protection plugs supplied with
the actuator with metal plugs.
Overview of the cable entries conduits.

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4.13 Safety Instructions for Installation in Hazardous Area
4.13.1 INSTRUCTIONS FOR EXPLOSIONPROOF ENCLOSURES
Important: F02 electric actuators must be installed and maintained
according to the applicable Rules regarding the electrical
installation in hazardous areas (other than mines) classified as
zone 1 and/or 2 (gas) and zone 21 and/or 22 (dust) according
to EN 60079-10 (hazardous area classification).
Example: EN 60079-14 (electrical installation), EN 60079-17
(maintenance).
During the dismantling and subsequent reassembling of the explosionproof enclosures
(covers, cable glands, joints) be careful to bring these enclosures back to their original
condition to maintain their integrity. In particular, be sure the joint surfaces of all enclosures
are spread with a film of recommended grease.
Proceed as follows:
• Do not damage the explosionproof mating surfaces on the housing and on the electrical
enclosure covers.
• Reinstall all the screws that go with the dismantled parts, and block them with a thread
sealant after spreading them with a film of copper- or molybdenum-based grease. This
will keep screws from sticking and make maintenance operations easier.
• Check that the bolts and screws are the same dimension and quality as the original ones
(as stated on the nameplate), or a better quality.
• Replace the weatherproof seals that may have been removed (O-Ring for the covers).
Important: In case the screws of the cover must be replaced, SS Class
A4 grade 70 screw must be used with minimum yield strength
450 N/mm2
Warning: Do not electrically operate the F02 when the electrical
enclosures are removed. Operating the unit without electrical
enclosures could cause personal injury.
4.13.2 INSTALLATION IN ENVIRONMENT WITH EXPLOSIVE DUSTS
Important: F02 electric actuators must be installed and maintained
according to the applicable Rules regarding the electrical
installation in Hazardous areas (other than mines) classified as
zone 21 and/or 22 (dust) according to EN 60079-10 (hazardous
area classification). Example: installation and maintenance
according to EN 50281-1-2.
Special attention is requested to the following:
• before the assembly the joint surfaces must be greased with silicone oil or equivalent.
• cable glands must have minimum protection degree IP6X (EN 60529).
• periodically verify the quantity of dust deposited on the enclosure and clean it if more
than 5mm. using a damp cloth to avoid static electricity.

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F02 Quarter-turn Electric Actuators
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5. LUBRICATION
5.1 Lubrication inspection
The actuator is grease lubricated for life, therefore under normal working conditions no
grease needs to be replaced or added.
In case of maintenance the following grease is recommended:
AEROSHELL GREASE 7 or equivalent, for ambient temperature -40 °C to 70 °C
6. ACTUATOR SETTING AND CONFIGURATION
Before connecting power to the actuator, check that the voltages are correct and according
to the indications on the nameplate. Wrong power supply could cause permanent damage
to the electrical components.
The setting of the F02 actuator can be carried out through the control panel inside the
actuator control system. To access the panel, remove the actuator cover and when setting
is complete replace the cover, following the procedures indicated below.
6.1 Removal of the control unit cover
Using a 5 mm Allen key, loosen the four screws and remove the cover.
Removal of the control unit cover.