Trox Technik PWX Series Installation instructions

(11/2022) Waterside Fancoil Units – Type PWX 1
Waterside
Fancoil Units
Type PWX
Read the instructions prior to performing any task
Installation & Operating Manual GB/en

2Waterside Fancoil Units – Type PWX (12/2022)
TROX UK Ltd
Caxton Way
Thetford, Norfolk
IP24 3SQ
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: http://www.troxuk.co.uk
© TROX UK Ltd 12/2022
125979T – 11/2022
Original Instructions

(12/2022) Waterside Fancoil Units – Type PWX 3
General information
About this manual
This operating and installation manual enables operating or service
personnel to correctly install the waterside fancoil unit and to use it
safely and efficiently.
This operating and installation manual is intended for use by fitting
and installation companies, in-house technicians, technical staff,
properly trained persons, and qualified electricians or air conditioning
technicians.
It is essential that these individuals read and fully under-stand this
manual before starting any work. The basic prerequisite for safe
working is to comply with the safety notes and all instructions in this
manual.
The local regulations for health and safety at work and the general
safety regulations for the area of application of the ventilation unit also
apply.
This manual must be given to the system owner when handing over
the system. The system owner must include the manual with the
system documentation. The manual must be kept in a place that is
accessible at all times.
Illustrations in this manual are mainly for information and may differ
from the actual design.
Other applicable documentation
 TROX Fancoil technical schedule
 Project-specific documents (if any)
TROX Technical Service
To ensure that your request is processed as quickly as possible,
please keep the following information ready:
 Product name
 TROX order number & position No.
 Delivery date
 Brief description of the fault
TROX Order No. and POS. number can be found on the label
attached to each unit (see example below). Definition of the PWX
order code can be found within IOM appendix: appendix: PWX
Order code
Contact details
Online
www.troxuk.co.uk
Phone
[phone]
Copyright
This document, including all illustrations, is protected by copyright
and pertains only to the corresponding product.
Any use without our consent may be an infringement of copyright,
and the violator will be held liable for any damage.
This applies in particular to:
 Publishing content
 Copying content
 Translating content
 Microcopying content
 Saving content to electronic systems and editing it
Limitation of liability
The information in this manual has been compiled with reference to
the applicable standards and guidelines, the state of the art, and our
expertise and experience of many years.
The manufacturer does not accept any liability for damages resulting
from:
 Non-compliance with this manual
 Incorrect use
 Operation or handling by untrained individuals
 Unauthorised modifications
 Technical changes
 Use of non-approved replacement parts
The actual scope of delivery may differ from the information in this
manual for bespoke constructions, additional order options or as a
result of recent technical changes.
The obligations agreed in the order, the general terms and conditions,
the manufacturer's terms of delivery, and the legal regulations in
effect at the time the contract is signed shall apply.
We reserve the right to make technical changes.
Defects liability
For details regarding defects liability please refer to Section 7,
Warranties, of the TROX UK Ltd Terms and Conditions of sale.
Terms and Conditions of Sale are available at www.troxuk.co.uk
General Information

4Waterside Fancoil Units – Type PWX (12/2022)
Contents
1.0 PWX unit overview.......................................................... 5
2.0 Safety............................................................................... 6
2.1 Symbols used in this manual......................................... 6
2.2 Equipment use................................................................ 6
2.3 Safety signs .................................................................... 7
2.4 Residual risks ................................................................. 7
2.5 Qualified staff.................................................................. 8
2.6 Personal protective equipment...................................... 8
2.7 Behaviour in the event of accidents.............................. 9
3.0 Transport and storage.................................................... 9
3.1 Delivery of the fancoil unit ............................................. 9
3.2 Delivery check ................................................................ 9
3.3 Moving packages.......................................................... 10
4.0 Installation..................................................................... 11
4.1 General installation information .................................. 12
4.2 Installing the fancoil unit.............................................. 12
4.3 Installing fancoil attachments...................................... 13
4.4 Connecting the water pipes ......................................... 15
4.5 Connecting the ductwork............................................. 16
5.0 Making electrical connections ..................................... 18
5.1 Wiring ............................................................................ 19
5.2 Electric heating............................................................. 19
6.0 Initial commissioning ................................................... 20
6.1 Unit inspection.............................................................. 20
6.2 Initial start-up................................................................ 20
6.3 Post start-up checks..................................................... 21
7.0 Maintenance and cleaning ........................................... 21
8.0 Replacement parts list.................................................. 27
Appendix A Declaration of Incorporation / Conformity.... 28
Appendix B Commissioning / Maintenance Report.......... 30
Appendix C Initial Start-Up................................................. 31
C1 Initial start-up and addressing.......................................... 31
C1.1 Control Type 0 (Site Fitted Controls) .......................... 31
C1.2 Control Type 1 (BACnet) .............................................. 31
C1.3 Control Type 2 (Standalone)........................................ 34
C1.4 Control Type F (Free-Issue Controls).......................... 34
C1.5 Manual potentiometer (Constant Volume).................. 34
Appendix D Order Code ..................................................... 35
Table of Contents

(12/2022) Waterside Fancoil Units – Type PWX 5
1.0 PWX unit overview
Fig 1: Waterside fancoil unit
①Condensate drip tray
②Heat exchanger
③Fan access panel
④Fan deck
⑤Fan
⑥Motor
⑦Spigot
⑧Inlet air filter
⑨Controls enclosure (base)
⑩Controls enclosure access panel
PWX unit overview

6Waterside Fancoil Units – Type PWX (12/2022)
2.0 Safety
2.1 Symbols used in this manual
Safety notes
Symbols are used in this manual to alert readers to areas of potential
hazard. Signal words express the degree of the hazard. Comply with
all safety instructions and proceed carefully to avoid accidents,
injuries and damage to property.
Safety notes as part of instructions
Safety notes may refer to individual instructions. In this case, safety
notes will be included in the instructions and hence facilitate following
the instructions. The above listed signal words will be used.
Example:
1. ▶Untighten the screw
2. ▶
Be careful when closing the lid.
3. ▶Tighten the screw
Additional markers
In order to highlight instructions, results, lists, references and other
elements, the following markers are used in this manual:
Marker
Explanation
__ ▶
1., 2., 3. ...
Step-by-step instructions

Results of actions

References to sections in this manual and to
other applicable documents

Lists without a defined sequence
[Switch]
Operating elements (e.g. push buttons,
switches), display elements (e.g. LEDs)
‘Display’
Screen elements (e.g. buttons or menus)
2.2 Equipment use
2.2.1 Correct use
Waterside fancoil units are used for the air conditioning of internal
spaces such as offices. Functions of the waterside fancoil Type
PWX:
 Ventilation
 Heating and/or cooling
Type PWX is designed for internal horizontal installation behind false
ceilings or freely suspended from the structural soffit (exposed). The
unit has to be properly installed by competent, qualified operatives.
Correct use also involves complying with all the information provided
in this manual. Any use that goes beyond the correct use or any
different use of the unit is regarded as incorrect use.
2.2.2 Incorrect use
Incorrect use includes:
 Any use that is not described in this operating manual.
 Operation that does not comply with the technical data.
 Modifying of the unit by others, tampering with the unit.
 Use, installation, operation, maintenance or repair other than
described in this manual.
 Having work carried out by unqualified individuals.
 Use of non-genuine replacement parts or accessories, whose
quality and function are not equivalent to those of the original
parts.
 Operation in rooms with explosive gases or gas mixtures.
DANGER!
Imminently hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING!
Potentially hazardous situation which, if not avoided, may result in
death or serious injury.
CAUTION!
Potentially hazardous situation which, if not avoided, may result in
minor or moderate injury.
NOTICE!
Potentially hazardous situation which, if not avoided, may result in
property damage.
ENVIRONMENT!
Environmental pollution hazard.
CAUTION!
Danger of finger entrapment when closing the lid.
WARNING!
Danger due to incorrect use!
Incorrect use of the unit can lead to dangerous situations.
Safety

(12/2022) Waterside Fancoil Units – Type PWX 7
 Operation in rooms where the supply or extract air contains
particles that are conductive, aggressive corrosive, combustible
or hazardous to health.
 Operation in rooms where the humidity is permanently high
(> 60%).
 Operation outdoors.
 Use for enforced ventilation.
 Operation without return air filters.
2.3 Safety signs
The following symbols and signs are found on the unit. They apply to
the very location where they are found.
Electrical voltage
Hazardous electrical voltage that is present in the
ventilation unit. Only skilled qualified electricians are
allowed to work on parts of the fancoil unit marked
with this symbol. Such work must be carried out only
by skilled qualified electricians.
Controls access panel
Hazardous electrical voltage that is present in the
ventilation unit. Only skilled qualified electricians are
allowed to work on parts of the fancoil unit marked
with this symbol. Such work must be carried out only
by skilled qualified electricians.
2.4 Residual risks
2.4.1 Electric current
2.4.2 Dirt and objects lying around
2.4.3 Rotating parts
2.4.4 Hygiene
2.4.5 Tools
DANGER!
Danger of death due to electric current!
Danger of electric shock! Do not touch any live components!
– Have work on the electrical system carried out only by skilled
qualified electricians.
– If the insulation is damaged, disconnect the power supply
immediately and have the insulation repaired.
– Before you start working on electric systems and equipment,
switch off the supply voltage and secure it against being
switched on accidentally. Comply with the 5 safety rules:
–Disconnect.
–Secure it against being switched on accidentally.
–Ensure that no voltage is present.
–Connect to the earth; short circuit connection
–Cover nearby parts that carry a voltage or install barriers.
– Do not bypass / disable any circuit breakers. Maintain the
correct current rating when you replace a circuit breaker.
– Ensure that live parts do not come into contact with moisture.
Moisture can cause a short circuit.
CAUTION!
Risk of injury from falling as a result of dirt or objects lying
around!
Dirt and objects lying around can lead to the risk of slipping and
tripping. Injuries can be caused by falling.
– Work areas should always be kept clean.
– Objects that are no longer required should be removed from the
work area, particularly those that are near the floor.
–
Tripping hazards that cannot be avoided should be marked with
yellow and black marking tape.
WARNING!
Risk of injury from rotating parts!
Rotating parts in the fan can cause serious injuries.
– Do not reach into or handle the moving impeller wheel during
operation.
– Do not open inspection access doors and covers during
operation.
– Ensure that the impeller wheel is not accessible during
operation.
– Observe the run-down time! Check that no parts are moving
before you open an inspection access door or cover.
–
Switch off the unit and secure it against being switched back on
again before starting any work on moving fan components. Wait
until all parts have come to a standstill.
CAUTION!
Health risk due to hygiene!
When the unit is not used for several weeks, bacteria and germs
may start growing in the air filter and in the heat exchanger.
–
Change the air filters and clean the heat exchanger after lengthy
idle periods.
– Change filters and clean the heat exchanger at the
recommended intervals.
CAUTION!
Risk of injury as a result of the negligent handling of tools!
Negligent handling of tools can lead to crushing or cuts.
– Tools must be handled carefully and as intended.
– The weight must be considered when transporting tools.
– Protective gloves and safety shoes should be worn.
Safety

8Waterside Fancoil Units – Type PWX (12/2022)
2.4.6 Unsuitable installation location
2.5 Qualified staff
The work described in this manual has to be carried out by
individuals with the qualification, training, knowledge and experience
described below:
Facility manager
Facility managers are trained individuals who understand any
potential hazards related to the work under consideration, and who
recognise and avoid any risks involved. Facility managers must not
carry out any jobs beyond regular operation unless explicitly stated
in this manual and unless the system owner has specifically agreed
to them.
Training to a facility manager is provided by the HVAC contractor
when the system is handed over. A facility manager's tasks include
cleaning the unit, performing functional tests and regular checks,
and carrying out maintenance and adjustment work.
HVAC technician
HVAC technicians are individuals who have sufficient professional or
technical training in the field they are working in to enable them to
carry out their assigned duties at the level of responsibility allocated
to them and in compliance with the relevant guidelines, safety
regulations and instructions.
HVAC technicians are individuals who have in-depth knowledge and
skills related to HVAC systems; they are also responsible for the
professional completion of the work under consideration.
HVAC technicians are individuals who have sufficient professional or
technical training, knowledge and actual experience to enable them
to work on HVAC systems, understand any potential hazards related
to the work under consideration, and recognise and avoid any risks
involved.
Network administrator
Network administrators design, install, configure and maintain the IT
infrastructure in companies or organisations.
Skilled qualified electrician
Skilled qualified electricians are individuals who have sufficient
professional or technical training, knowledge, experience and
qualifications to relevant local wiring regulations to enable them to
work on electrical systems, understand any potential hazards related
to the work under consideration, and recognise and avoid any risks
involved.
Any work has to be carried out by individuals who can be expected to
carry out their assigned duties reliably. Individuals whose reaction
time is delayed due to alcohol, drugs or other medication must not
carry out any work.
2.6 Personal protective equipment
2.6.1 Description of personal protective equipment
Personal protective equipment is equipment that protects the user
against health or safety risks at work.
Personal protective equipment must be worn for various types of
work; the protective equipment required is listed in this manual
together with the description of each type of work.
Industrial safety helmet
Industrial safety helmets protect the head from
falling objects, suspended loads, and the
effects of striking the head against stationary
objects.
Industrial safety glasses
Industrial safety glasses protect the eyes from
materials or debris and the effects of striking the
head against stationary objects.
Protective gloves
Protective gloves protect hands from friction,
abrasions, punctures, deep cuts, and direct
contact with hot surfaces.
WARNING!
Risks caused by an unsuitable installation location!
Installing the unit in an unsuitable location can lead to dangerous
situations.
– The waterside fancoil unit should be installed in a thermally
insulated, low-leakage building.
– Frost free and dry installation location.
– Install the unit in a manner to protect the unit from being
tampered with by unauthorised individuals.
– The unit must remain accessible for maintenance and cleaning.
WARNING!
Danger of injury or risk of damage to property due to
insufficiently qualified individuals!
Insufficiently qualified individuals are not aware of the risks
involved in working with the fancoil unit and are hence likely to put
themselves or others into danger, causing severe or fatal injuries.
– Have any work carried out only by qualified personnel.
– Keep insufficiently qualified individuals away from the work
area.
Safety

(12/2022) Waterside Fancoil Units – Type PWX 9
Safety shoes
Safety shoes protect the feet from crushing,
falling parts and prevent slipping on a slippery
floor.
Protective clothing
Protective clothing is close-fitting, with low tear
resistance, close-fitting sleeves, and no
projecting parts.
2.7 Behaviour in the event of accidents
Preventative measures
 Always be prepared for accidents or fire!
 Keep first aid equipment (first aid kit, blankets, etc.) and fire
extinguishers close at hand.
 Familiarise personnel with accident reporting, first aid and rescue
equipment.
 Keep access paths for rescue vehicles clear.
Measures in the event of accidents
 Trigger an emergency stop immediately, and isolate power supply
to the fancoil unit.
 Implement first aid measures.
 Rescue individuals from the hazardous area.
 Inform the responsible person at the operation site.
 Notify the emergency services.
 Clear access paths for rescue vehicles.
3.0 Transport and storage
3.1 Delivery of the fancoil unit
3.1.1 Complete and partial units
Upon delivery, check the fancoil unit for transport damage and
completeness, Chapter 3.2 ‘Delivery check’.
The fancoil unit is shipped fully assembled or, for units with pre-wired
actuators and/or condensate pumps, with the individual components
packaged with the fancoil for site installation. All loose components
will be identified on the pallet labelling.
3.1.2 Symbols on the packaging
The packaging carries the following marks and symbols. Be sure to
follow them when you are moving the unit.
The contents of the delivery and packaging materials
are not designed to support additional weight.
The contents of the delivery and packaging materials
are not designed to prevent the ingress of moisture.
3.2 Delivery check
Check delivered items immediately after arrival for transport damage
and completeness against the delivery documentation. In case of
any damage or an incomplete shipment, contact the shipping
company and TROX immediately.
If any parts are missing, have the driver confirm them on the
consignment note. For any claims it is necessary that you follow the
procedure below. In each of the following cases do contact TROX
before you start installing a unit.
The packaging has been damaged
 Unpack the goods in the presence of the person who has
delivered them and have them confirm the damage on the
shipping order.
 Photograph the damage.
 Report the damage to TROX immediately in writing.
No external damage to packaging, contents damaged
 Photograph the damage.
 Report the damage to TROX immediately in writing.
External components may be shipped un-assembled to protect
them from getting damaged during the transportation and
installation process. These components have to be properly
installed, in accordance with the manufacturer’s installation
instructions by others before energising the unit.
The packaging may also carry other symbols, notes, and
information. These must also be followed.
File a complaint as soon as you detect any damage. Claims for
compensation can be filed only within the complaint period. Refer
to TROX Terms and conditions of sale.
Safety / Transport and storage

10 Waterside Fancoil Units – Type PWX (12/2022)
3.3 Moving packages
3.3.1 Safety notes regarding transport
Improper transport equipment
Unbalanced loads and centre of gravity
Sharp edges, sharp corners and thin sheet metal parts
Damage to good being moved
Unloading
Units will be delivered on wooden pallets suitable for use with;
 Suitably rated fork-lift truck.
 Overhead crane
If unloading via overhead crane, ensure lifting beams and spreader
bars are installed to protect the units from damage. Ensure position
of slings do not damage any protruding parts of the package.
Pallets may contain more than 1 unit so total weight of the package
should be verified prior to lifting.
Distribution
Units should be transported from the unloading area to the installation
area in the delivery packaging. Mechanical handling equipment used
to unload the fancoil from its delivery packaging should be suitably
rated for the weight of the unit.
DO NOT lift the fancoil unit using the drip tray, valve assemblies,
spigots or inlet openings as this may result in damage to the unit. If
lifting by hand, use only the flanges along each side of the FCU;
Product weight
Unit size / designation
Weight (dry)
[kg]
PWX-60
35
PWX-90
50
PWX-120
63
PWX-150
73
PWX-180
86
PWX-205
96
 If possible, take the unit in its transport packaging up to the
installation location.
 Use only lifting and transport gear designed for the required load.
 Always secure the load against tipping and falling.
 Do not move bulky items just by yourself. Get help to prevent
injuries and damage. Weight limit for single person manual
handling is generally <25kg.
DANGER!
Danger of death due to suspended loads!
Falling loads may cause serious injury or death therefore:
– Never walk under suspended loads.
– Only move loads under supervision.
– Observe the specifications for the intended lifting points.
– Do not attach the lifting gear to protruding parts or lugs on
attached components.
– Ensure that the lifting gear is secure.
– Only use approved hoisting devices and lifting gear with
sufficient load-bearing capacity.
– Do not use any damaged or worn lifting gear.
– Do not place ropes or belts near sharp edges or corners; do not
knot or twist.
– Secure and permanently fix the load to the building structure
before leaving the workplace
WARNING!
Risk of injury from falling or toppling loads!
Loads may be unbalanced, i.e. the centre of gravity may not be
obvious. If the load is not properly attached to the lifting
equipment, it may topple and fall. Falling or toppling loads can
cause serious injuries.
– Lift a
ny load carefully and keep an eye on it to see whether it will
stay in place. If required, change the lashing point(s).
– Use additional means to secure the unit to the lifting gear, e.g.
ratchet straps (by others).
– Keep the unit secured against shifting and falling until
installation is complete.
CAUTION!
Danger of injury from sharp edges, sharp corners and thin
sheet metal parts!
Sharp edges, sharp corners and thin sheet metal parts of the heat
exchanger or of the cooling or heating coil may cause cuts or
grazes.
– Be careful when working on these components.
– Wear protective gloves, safety shoes, hard hat and safety
glasses.
Risk of damage to property due to the incorrect handling or
lifting of units!
If you handle or move packages incorrectly, they may topple or fall.
This can cause considerable damage to property.
–Do not put down packages hard and do not knock against them
with force. Watch out for protruding parts.
–When you are moving units around the building, be careful that
the unit or protruding parts are not damaged by the lifting gear.
Transport and storage / Installation

(12/2022) Waterside Fancoil Units – Type PWX 11
Storage Area
Please note:
 The area is internal and will not be affected by the weather.
 The surface where the equipment is to be placed is flat.
 The equipment will be raised from the floor to allow airflow and
stop the risk of water ingress.
 The area is well covered and protected.
 The area is well ventilated and has no risk of high humidity.
 The area is clean & dust-free.
Storage
Please note:
 Units must not have materials stacked / stored on them.
 All ancillaries must be placed in a safe and secure location, so
items do not go missing or get damaged.
 Store the unit only in its original packaging.
 Pipework caps are not removed.
 Ductwork connections are covered to stop the ingress of dirt and
foreign objects.
 Protect the unit from the effects of weather.
 Protect the unit from humidity, dust and contamination.
 Protect the unit from vibration.
 Storage temperature: 5°C to 35 °C.
 Relative humidity: 75 % max., no condensation.
 Maximum storage period: 12 months.
Packaging
Properly dispose of packaging material, using recycling facilities
where available.
4.0 Installation
Personnel:
 HVAC technician
Protective equipment:
 Industrial safety helmet  Safety shoes
 Protective gloves  Safety glasses
CAUTION!
Danger of injury from sharp edges, sharp corners and thin
sheet metal parts!
Sharp edges, sharp corners and thin sheet metal parts may cause
cuts or grazes.
– Be careful when carrying out any work.
– Wear protective gloves, safety shoes, hard hat and safety
glasses.
DANGER!
Danger of death due to suspended loads!
Falling loads may cause serious injury or death therefore:
– Never walk under suspended loads.
– Only move loads under supervision.
– Observe the specifications for the intended lifting points.
– Do not attach the lifting gear to protruding parts or lugs on
attached components.
– Ensure that the lifting gear is secure.
– Only use approved hoisting devices and lifting gear with
sufficient load-bearing capacity.
– Do not use any damaged or worn lifting gear.
– Do not place ropes or belts near sharp edges or corners; do not
knot or twist.
– Secure and permanently fix the load to the building structure
before leaving the workplace
WARNING!
Risk of injury from falling or toppling loads!
Loads may be unbalanced, i.e. the centre of gravity may not be
obvious. If the load is not properly attached to the lifting
equipment, it may topple and fall. Falling or toppling loads can
cause serious injuries.
–
Lift any load carefully and keep an eye on it to see whether it will
stay in place. If required, change the lashing point(s).
– Use additional means to secure the unit to the lifting gear, e.g.
ratchet straps (by others).
– Keep the unit secured against shifting and falling until
installation is complete.
Transport and storage / Installation

12 Waterside Fancoil Units – Type PWX (12/2022)
4.1 General installation information
The fancoil unit and attachments are to be installed and fixed to the
building structure, horizontally. Suspension components for installing
the fancoil unit are not included in the supply package, but have to be
selected by others and fit for the project specific installation.
4.1.1 Before installation
Before you install the unit, the following should be checked;
 The slab is ready, flat, level & can bear the weight of the
installation and bracketry.
 If being installed above an existing ceiling, ensure that there is
enough space through the ceiling grid to install the unit and
attachments.
 The room/area is dry, watertight, clean and dust-free. If there is
dust/construction work, then the unit openings should be
protected from contamination.In this case you have to ensure
that the unit cannot be started.
 Ensure that all components are clean before you install them. If
necessary, clean them thoroughly. If you have to interrupt the
installation procedure, protect all openings from the ingress of
dust or moisture.
 Installation of the unit must not impede the installation of the
condensate trap/pipework and the pipework run vs. fall required
can be achieved (refer to local regulations for minimum fall).
 All connections, pipework/ductwork, etc., can be independently
supported and not supported by the unit. The best practice is to
install self-supporting brackets prior to the connection of the unit.
 There is enough space allowed around and above/below the unit
once installed to perform maintenance and remove components
(refer to minimum maintenance access).
 If the unit is mounted at high level, confirm that there is a safe
manner to remove the parts and components and that there is
enough space at high level and at the floor level to allow this.
4.1.2 Installation information
 Install the fancoil unit in a thermally insulated, low-leakage
building, free from frost and dry.
 Install the unit only on structural elements that can carry the load
of the unit using only certified fixing systems.
 The underside of the unit must remain completely accessible for
maintenance and cleaning.
 Ensure sufficient clearance around the FCU to facilitate future
inspection / maintenance. A recommended 300mm maintenance
clearance below the FCU, and around controls enclosure should
observed.
4.1.3 Minimum maintenance access
To allow clear maintenance access to the fancoil, a minimum 300mm
zone should be maintained in front of the inlet, below the fan access
panel and in front of the control enclosure. Failure to observe this
access will restrict future maintenance of the fancoil.
For correct air entry conditions, a minimum of 1000mm should be
provided on the inlet of the fancoil to allow free passage of air into the
unit. Failure to observe this access will restrict airflow into the fancoil
increasing noise level and decreasing electrical efficiency.
4.2 Installing the fancoil unit
Fancoil unit ③Ø10 mm drop rod
Controls enclosure ④Lock nut
①Ø12 mm pre-formed fixing holes ⑤"C" washer (Ø25mm)
②Certified anchor ⑥Rubber washer
(Ø28mm x 3mm)
Installation
Each unit is provided with 6x Ø12 mm pre-formed holes within the top
flange (3 per side). All fixing locations must be used to ensure correct
distribution of weight.
Installation

(12/2022) Waterside Fancoil Units – Type PWX 13
Unit size /
designation
Fixing Centres ‘B’
[mm]
Weight (dry)
[kg]
PWX-60
634
35
PWX-90
934
50
PWX-120
1234
63
PWX-150
1534
73
PWX-180
1834
86
PWX-205
2084
96
Weights exclude valve assemblies or free-issue equipment
1. ▶Using a certified fixing system, suitable for the building
substrate and rated for the unit weight, install 6x M10 drop
rods in the correct positions to suit the unit size. The length
of the drop rod should be ≤ 35mm below the top of the
fancoil casing. Install lock nut ④on to the drop rods.
2. ▶Using suitable access equipment to lift the fancoil and
support its weight, manoeuvre the fancoil into position,
aligning the holes within the fancoil casing with the installed
drop rods.
3. ▶ Place the rubber washer ⑥and “C” washer ⑤over the
holes within the fancoil casing at each mounting point
before lifting the fancoil onto the drop rods. With the drops
passing through the fancoil casing, install rubber washer
⑥, “C” washer ⑤ and lock nut ④ to each drop rod making
sure the nut is fully engaged with the drop rod with at least
5mm of threaded rod visible below the nut.
4. ▶ Slowly lower the access equipment below the fancoil and
allow the weight of the unit to be taken by the lock nuts.
Correct the height and level of the fancoil by adjusting the
lower lock nut up or down as necessary. The unit must be
level in all planes. A slight decline (1° or 2°) towards the
condensate drip tray connection is allowed.
5. ▶ When the unit is level, tighten the top lock nut down onto
the fancoil casing ensuring the lower lock nut is secured
against moving.
6. ▶ Protect the fancoil openings with suitable plastic film or
protective wrapping.
4.3 Installing fancoil attachments
4.3.1 Inlet Plenum (IP)
Inlet plenums can be used to provide a sealed connection to the
fancoil from return air diffusers or to connect fresh air from the AHU.
Installation
Each unit is provided with 2x Ø12 mm pre-formed holes within the top
flange (1 per side) suitable for M10 threaded rods and 6 fixings holes
to facilitate connection to the fancoil (3 per side). All fixing locations
must be used to ensure correct distribution of weight.
Tolerance ±1.0mm
4.3.2 Inlet Attenuator (IA) / Discharge Attenuator (DA)
Inlet / discharge attenuators can be used to provide additional
attenuation to the inlet or discharge noise generated by the fancoil.
 Type IA: Filter from fancoil must be removed and installed at front
of IA attachment. 1000mm clearance for air entry must be
maintained in front of IA.
 Type DA suitable for fancoil units with rectangular spigot only.
Installation
Each unit is provided with 2x Ø12 mm pre-formed holes within the top
flange (1 per side) suitable for M10 threaded rods and 6 fixings holes
to facilitate connection to the fancoil (3 per side). All fixing locations
must be used to ensure correct distribution of weight.
Contamination
If there is a gap between installation and commissioning of the unit,
the following measures should be taken in order to avoid
cumbersome cleaning procedures at the time of commissioning;
–Cover all openings of the unit, e.g. with plastic film, to prevent
the ingress of dust, including the drip tray.
–Remove the filters and store them in a dry place protected from
dust; cover the filter openings.
–Switch off the power supply to the unit.
Installation

14 Waterside Fancoil Units – Type PWX (12/2022)
Tolerance ±1.0mm
4.3.3 Discharge Attenuator (DAR)
DAR Discharge attenuators are used to provide additional attenuation
to the discharge noise generated by the fancoil and provide circular
spigots for connection to secondary ductwork.
 Type DAR suitable for fancoil units with rectangular spigot only.
Installation
Each unit is provided with 4x Ø12 mm pre-formed holes within the top
flange (2 per side) suitable for M10 threaded rods and 6 fixings holes
to facilitate connection to the fancoil (3 per side). All fixing locations
must be used to ensure correct distribution of weight.
Tolerance ±1.0mm
4.3.4 Attachment weights and fixing centres
Unit size /
designation
‘W’
[mm]
Weight [kg]
IP
IA/DA
DAR
60
600
12
14
26
90
900
16
19
35
120
1200
21
24
45
150
1500
26
31
57
180
1800
32
38
69
205
2050
37
44
81
4.3.5 Attachment installation
1. ▶Inspect the fancoil unit and ensure any packing materials
are removed from the inlet or discharge opening to which
the attachment is to be installed. For IA installation, the
inlet filter must be removed from the fancoil before
installation of the IA attachment. The inlet filter must be
installed to the front of the IA when installed.
2. ▶Where the fancoil has been supplied
ready for attachment installation,
6No. M6x16 bolts and washers (3
per side) will be installed at the
specified attachment point (inlet /
discharge).
Remove these screws/washers and store safely as these
will be required to connect the attachment to the fancoil.
If the unit is not pre-installed with attachment fixings, the
fancoil casing must be modified to accept the attachment.
Locate the ‘cross marks’ (3 each side) on the inlet or
discharge (discharge attachments only suitable for fancoil
units with rectangular spigot)
Installation
PWX attachment fixings
If the fancoil unit was not supplied with fixings, these must be
sourced (by others) before installation can be completed.
•M6 Rivnut (x6)
•M6 x 16 screws/bolts & washers (x6)

(12/2022) Waterside Fancoil Units – Type PWX 15
Taking precautions to protect the fancoil (remove inlet filter
if necessary), drill each point (3 per side) with hole size to
suit M6 rivnut and install M6 rivnuts.
3. ▶Using a certified fixing system, suitable for the building
substrate and rated for the unit weight, install x2 (IP, IA,
DA) or x4 (DAR) M10 drop rods in the correct positions to
suit the attachment size. The length of the drop rod should
be ≤ 35mm below the top of the casing. Install lock nut ④
on to the drop rods.
4. ▶Using suitable access equipment to lift the attachment and
support its weight, manoeuvre the attachment into position,
aligning the holes within the casing with the installed drop
rods and attachment fixing points on fancoil casing.
5. ▶ Place the rubber washer ⑥and “C” washer ⑤over the
holes within the attachment casing at each mounting point
before lifting the attachment onto the drop rods. With the
drops passing through the attachment casing, install rubber
washer ⑥, “C” washer ⑤ and lock nut ④ to each drop rod
making sure the nut is fully engaged with the drop rod with
at least 5mm of threaded rod visible below the nut.
6. ▶ Install the M6x16 screws/washers through the attachment
side panel and secure into the rivnuts within the fancoil.
Ensure the units are aligned and pushed together to form a
seal. The required torque setting for the fixings is 10 Nm.
7. ▶ Slowly lower the access equipment below the attachment
and allow the weight to be taken by the lock nuts. Correct
the height and level of the attachment by adjusting the
lower lock nut up or down as necessary. The unit must be
level in all planes.
8. ▶ When the attachment is level, tighten the top lock nut down
onto the casing, ensuring the lower lock nut is secured
against moving.
9. ▶ Protect the openings with suitable plastic film or protective
wrapping.
4.4 Connecting the water pipes
4.4.1 General information
 Review the drawings to understand the pipework layout, pipework
size, and valves/ancillaries that will be required to be installed.
 Ensure you have the correct tools and materials, pipework and
ancillaries to complete the installation.
 The unit may be supplied with factory installed valve sets. Ensure
unions to suit the site pipework system are correct and available.
 If site installation of valve sets is necessary, ensure the unit is
protected to prevent damage during installation.
 Control valves, gate valves and safety valves are required; if they
are not part of the supply package, they have to be provided by
others.
 Drain valves and vent valves are required; if they are not part of
the supply package, they have to be provided by others.
 Using the correct brackets, install the pipework up to the FCU with
only final connections being required, be careful that do not to
obstruct the condensate pipework and drip pan that is to be
installed later.
 All pipework and connections must be independently supported
and not supported by the unit. The best practice is to install self-
supporting brackets prior to the connection of the unit.
 Before final connection, ensure that the mains pipework has been
flushed, inspected and installation approved by the relevant
parties.
 Final connection of the fancoil to the mains system should only be
completed following sign off to ensure contaminants from the
installation of mains pipework on site are not flushed into the
valve assemblies and heat exchanger.
 Using flexible hoses instead of rigid water pipes to connect the
heat exchanger will allow adjustment between heat exchanger &
mains connections.
 Once complete, connect to the FCU the flow and return pipework.
Ensure to keep the valves closed as the Fan Coil unit will need to
be pressure tested, flushed, and back flushed.
 Insulate the pipework as necessary.
4.4.2 Heat exchanger connection
Right hand (…-R) Left hand (…-L)
coil connection detail coil connection detail
Tightening the connection
Tighten threaded connections, including valves and lockshields, with
a spanner.
Heat exchanger and pipes may easily become damaged. Always
use a suitable tool to counter the tightening force in order to
prevent any damage.
Installation

16 Waterside Fancoil Units – Type PWX (12/2022)
Interfaces
Dimensions
Connection options
Heat Exchanger
CHW/LTHW
connection
Ø15mm or
Ø22mm plain
copper tails
Compression coupling
(rigid)
Capillary solder (rigid)
Valve Set (TROX)
CHW/LTHW
connection
3/4" Euroconus
connection
3/4" flat face adaptors
for pipe systems with
3/4" swivel nut (option)
3/4" Euroconus x Ø15
mm or Ø22 mm capillary
solder fittings (option)
3/4" Euroconus x 1/2
male BSP, taper union
fittings (option)
Condensate Drain
Drip tray connection
Spigot ∅15mm
Hose (by others)
4.4.3 Installation of condensate drainage
Each fancoil unit is installed with an integral condensate drip tray to
facilitate collection of condensed water from the cooling cycle and
removal from the unit.
The condensate system can be gravity fed, requiring the correct fall
from the fancoil to the collection/discharge point or a pumped system
utilising an electronic pump.
 For gravity fed condensate systems, refer to local regulations for
guidance on minimum fall to collection/discharge point and
ensure pipework installation conforms.
 For systems utilising electronic pumps, install the pump according
to the manufacturers literature.
 The condensate pipework must be installed, connected and
tested before use.
4.4.4 Filling the heat exchanger
Following sign off for the pipework installation, the heat exchanger
can be filled and vented.
 Ensure to keep the valves closed as the Fan Coil unit will need to
be pressure tested, flushed, and back flushed before opening to
the mains pipework system.
1. ▶Fill the heat exchanger and vent it. To fill the system, use
clean tap water (pH value 6.5 to 9) or a water glycol mixture
(max. 30 % glycol). Heat exchangers are fitted with bleed
screws for venting.
2. ▶ Check the system for leaks immediately after filling and
then at regular intervals.
3. ▶ Backflush the heat exchanger, avoiding flushing through
the valve sets, until the water is clear. Refer to local
regulations / guides for procedure and sign off.
4. ▶ Following sign off for each FCU, open valves and close
bypass.
4.4.5 Actuator head connection (TROX) – Typical
 Do not attempt to fit the actuator if the black handle has not been
fully removed.
 Sometimes the lower portion of the handle is too tight to remove
by hand, in this case gently use a pair of grips to remove the
handle.
4.5 Connecting the ductwork
4.5.1 General information
To allow the transfer of conditioned air from the fancoil into the space,
each fancoil has an integral supply air plenum, installed with 1 - 7
circular spigots or 1 rectangular spigot to connect out to supply air
terminal devices (ATD’s), depending on the design requirements.
As a guide, the velocity of air through each spigot should be limited to
≤ 2.5m/s. Installations resulting in duct velocities > 2.5m/s can affect
the noise level of the FCU.
 Review the drawings to understand the duct layout, duct size,
and if there are any requirements for volume control dampers to
be installed within the ducting.
 The plenum should have spigots installed to connect out, via
ducting to the ATD’s.Check the number and location of spigots
against the drawings.
WARNING!
THE ACTUATOR MUST BE FITTED TO THE VALVE BEFORE
ANY POWER IS APPLIED TO IT.
Damage may occur if the actuator is powered up without being
fitted to the valve!
Installation
Sub-zero temperatures will damage the heat exchanger!
Only fill the heat exchanger if there is no danger of freezing.

(12/2022) Waterside Fancoil Units – Type PWX 17
 Install the spiral galvanized ducting, or rectangular if needed,
connecting to the fancoil unit out to the location of the supply
ATD’s.
 Where the use of acoustic flexible connections between the
fancoil and ATD’s is required, ensure they are installed according
to the manufacturer’s instructions avoiding compression and
sharp bends resulting in higher pressure differential.
 Use brackets and fixings as per requirements to ensure weight of
the ductwork is not transferred to the fancoil.
 It is good practice that the ducting is installed in a straight line for
a minimum of 3x ØD from the unit before any bends, volume
control damper or other devices are installed.
 The ducts are usually connected/fastened with sheet metal
screws/clamps and some form of duct mastic/sealant
purposefully manufactured for the application to provide an
airtight seal.
 All ductwork should be equipotentially bonded. The bonding
should be visible on visible ductwork and easily identified.
4.5.2 Fancoil discharge spigots
Connection of the secondary ductwork system to the fancoil unit
should be completed by skilled, qualified operatives in accordance
with good engineering practices and local standards.
 Ensure all secondary ductwork installations are correctly sized to
match the fancoil unit connection size and installed in accordance
with DW144 or other local regulations, and should take note of
minimum duct bend radii.
 Ductwork lengths should be minimised where possible to limit
external pressure to the fancoil unit. Where flexible ducts are
used, these should be stretched to ensure expansion of the
internal spiral and should be supported along the full length to
prevent sagging.
Unit size /
designation
Rectangular Spigot
length ‘R’
[mm]
Max. Circular Spigot
Qty
PWX-60
498
4
PWX-90
798
4
PWX-120
1098
5
PWX-150
1398
6
PWX-180
1698
6
PWX-205
1948
7
4.5.3 Ductwork insulation
To ensure that the vapor barrier is maintained, condensation does not
form on the cold surfaces of the installation and there is no cold
bridging, the supply air from the fancoil should be insulated. In some
instances, the return air should be as well.
4.5.4 Discharge spigot modification
Each fancoil unit is delivered with a specific spigot configuration to
suit the secondary ductwork configuration. If necessary, additional
spigots can be added to the FCU by removing the spigot blanking
plates and installing additional spigots.
Before working on the fancoil, ensure the unit is stopped and is
isolated from the mains power supply. To remove the spigot blanking
plate;
1. ▶Remove the screws from the blanking plate (x4 per plate)
and store safely.
2. ▶ Gently pull the blanking plate away from the fancoil casing
ensuring the insulation is removed.
Interfaces
Dimensions
Connection options
FCU
discharge
Ø198 mm, Ø248 mm or
198 mm high x 'R'
Spiral ductwork
(rigid)
Acoustic, flexible
ductwork
(recommended)
Acoustic ductwork!
The use of 0.5m or 1.0m acoustic flexible ductwork is
recommended within the site installation for the reduction of
discharge noise and to assist with the coordination of services.
Please check the project specification to ensure acoustic ductwork
is used where specified.
Installation

18 Waterside Fancoil Units – Type PWX (12/2022)
3. ▶ Place the new spigot into the opening, aligning the tabs
with the holes within the fancoil casing.The short end of
the spigot should be inserted into the fancoil
4. ▶ Using the screws removed from the blanking plate, secure
the spigot to the fancoil and apply an airtight sealant
around the joint between the spigot and fancoil. Allow
sufficient time for the sealant to cure before energising the
fancoil
If spigot relocation is required, existing spigots and blanking plates
can be switched on site. Additional spigots or blanking plates can be
ordered from TROX, Chapter 8 ‘Replacement Parts List’.
4.5.5 Fresh air connection
Where fresh air from the central air handling unit is to be ducted to the
back of the fancoil unit (not connecting using inlet plenum accessory)
to allow induction through the fancoil, the duct should be installed
centrally on both unit height and length with a minimum clearance of
300mm.
The discharge velocity from the fresh air duct should be
maintained at ≤ 2.0 m/s.
5.0 Making electrical connections
Personnel:
 Skilled qualified electrician
Protective equipment:
 Industrial safety helmet  Safety shoes
 Protective gloves  Safety glasses
General information
Any cables must be designed for the supply voltage for which they
will be used. The length and cross section as well as any contact
resistance may increase voltage losses. The power rating of each
unit must also be considered.
A skilled qualified electrician has to select the correct cable types and
sizes. This job must only be carried out by specialist electrical
companies.
 The electrical connection must comply with local wiring
regulations and codes of practice. Be sure to comply with BS 7671
IET wiring regulations.
 The connection data can be found on the wiring diagram supplied
with each unit.
 Protect any connections from physical damage.
 Use cable glands to secure cables entering the fancoil unit.
 Only skilled qualified electricians are allowed to open the controls
access panel. Ensure that the unit is safely isolated before you
open the cover to access the terminal connections. Verify there is
no voltage present using an approved voltage indicator.
 For units without integral controls from TROX follow the
instructions of the control’s provider.
Installation / Making electrical connections
DANGER!
Danger of death due to electric current!
Danger of electric shock! Do not touch any live components!
– Have work on the electrical system carried out only by skilled
qualified electricians.
– If the insulation is damaged, disconnect the power supply
immediately and have the insulation repaired.
– Before you start working on electric systems and equipment,
switch off the supply voltage and secure it against being
switched on accidentally. Comply with the 5 safety rules:
–Disconnect.
–Secure it against being switched on accidentally.
–Ensure that no voltage is present.
–Connect to the earth; short circuit connection
–Cover nearby parts that carry a voltage or install barriers.
– Do not bypass / disable any circuit breakers. Maintain the
correct current rating when you replace a circuit breaker.
– Ensure that live parts do not come into contact with moisture.
Moisture can cause a short circuit.
=
=
≥300

(12/2022) Waterside Fancoil Units – Type PWX 19
5.1 Wiring
1. ▶ Take off the control enclosure lid; to do so, loosen the M5
POZI screws on the bottom and remove the M5 POZI
screws from the front of the enclosure, then remove the lid.
An earth connection to the control panel lid is provided, this
can be removed to allow the complete removal of the lid.
2. ▶ Connect the fancoil unit to the mains supply according to
the wiring diagram which will be included inside the control
panel.
Refer to TROX wiring diagram within controls enclosure on
each unit. In the event that the wiring diagram cannot be
located, please contact TROX who can provide
replacement unit specific wiring diagrams.
Use sheathed cable, ensuring the cable is suitably secured
and supported (e.g. cable gland). A Ø20mm hole is
provided for mains electrical entry to the control enclosure.
3. ▶ Reinstate the earth cable connection to the spade
connector on the control panel lid then reinstall the lid to
the control panel. Ensure all fixings are used and
tightened.
5.2 Electric heating
TROX PWX fancoil units, equipped with an integral electric heater,
include Kanthal D (or equivalent) element, magnesium oxide
insulation contained within 304 grade stainless steel tube and
stainless-steel helical fin surround.
To maintain safe operation, the following features are included as
standard;
 High temperature cut out set to ~40°C with auto reset at ~30°C
 Airflow proving via integral PCB or CT switch to prevent heating
element activation when fan is stopped
 Variable element output (0-10Vdc required) via TROX supplied
solid state thyristor
The MAXIMUM heater size and MINIMUM volume flow required for
each unit size can be found within the table;
Unit size
MAX Heater size
[kW]
MIN Volume
[l/s]
PWX-60/1
0.8
46
PWX-90/1
1.5
77
PWX-90/2
1.5
108
PWX-120/2
2.0
133
PWX-120/3
2.0
136
PWX-150/3
3.0
159
PWX-180/3
3.0
136
PWX-180/4
3.0
154
PWX-205/4
4.0
246
DANGER!
Running or attempting to run the PWX fan coil below the
minimum heating airflows detailed is dangerous!
WARNING!
Running type PWX fan coil units below minimum heating
cycle volume can result in overheating & risk of fire!
– For safety reasons the minimum design volume (Vmin) must not
be lower than the minimum heating cycle volume.
– Control strategy for the heating cycle must allow a minimum 10
min. run-
on time to allow the heater element to safely cool at the
end of the heating cycle. During this time, the minimum heating
cycle volume must be maintained.
– If auto high temperature cut out (HTCO) operates due to
temperature over limit, it is recommended that the HTCO be
replaced before making the heater element operational again.
– For safety reasons, if the HTCO manual reset operates due to
temperature over limit, the HTCO must be replaced before
making the heater element operational again.
Installation / Initial Commissioning
WARNING!
Where integrated controls are not provided by TROX
(control type 0 or F), safety interlocks must be provided by
the controls supplier to prevent energising the electric
heater where the volume flow falls below the minimum
stated.!
– Control strategy for the heating cycle must allow a minimum 10
min. run-
on time to allow the heater element to safely cool at the
end of the heating cycle. During this time, the minimum heating
cycle volume must be maintained.
– The minimum design volume (Vmin) must not be lower than the
minimum heating cycle volume.

20 Waterside Fancoil Units – Type PWX (12/2022)
6.0 Initial commissioning
Personnel:
 Skilled qualified electrician
 HVAC technician
Protective equipment:
 Industrial safety helmet  Safety shoes
 Protective gloves  Safety glasses
6.1 Unit inspection
6.1.1 Before initial commissioning:
Once the equipment has been installed and prior to the functional
testing and commissioning phase taking place, the following checks
should be completed;
General
 Remove protective film, wrapping, if any. Ensure that the unit is
clean. If necessary, clean the faces of the inlet filter and heat
exchanger and drip tray.
 Inlet filters are installed, clean, and are of the correct grade.
Check filters for correct fit and contamination ‘Checking and
replacing the filter’. Should the filters have been contaminated
even before commissioning, replace them.
 Fan/motor rotates in the correct direction with no obstructions (by
hand) to ensure free rotation and to check impeller is not rubbing
on the inlet ring or on any part of the scroll housing. Fan, blades,
and motors are clean and dust-free.
 Heat exchanger is clean, in good condition, and the fins
undamaged.
 Pipework is connected correctly (flow, return, heating, cooling
etc.) and does not put stress on the fancoil connections or create
vibrations.
 The mains water system has been hydraulically balanced.
 Pipework is insulated, vapor sealed and labelled.
 All valves/control valves, commissioning devices and strainers
are installed, and the correct direction and strainers are clean.
Ensure actuators are installed before energising.
 Ensure condensate pipework is installed to the correct fall (refer
to local regulations or guides). If condensate pumps are
installed, ensure these are primed according to the
manufacturer’s instructions before energising.
Electrical General
 Unit and components are fully earthed in line with the TROX
wiring diagram and earthing has been tested.
 All wiring must comply with local wiring regulations. PWX internal
wiring complies with BS 7671: IET wiring regulations.
 Isolation switch / fused spur installed for each unit in line with
local regulations to enable isolation of the unit control panel from
the mains supply.
 Electrical voltage from the site matches the unit required voltage
(230Vac, 1ph 50 - 60Hz) and correct protection fuse size is
installed (refer to TROX wiring diagram).
 All cabling is installed & connected according to TROX wiring
diagram and is not damaged and has been tested/torque tested.
 Operation of the electric heating element is fan controlled and
interlocked with the control system.
 Fan delay incorporated into the control's logic, allowing the fan to
run [10 mins] after the heater has deactivated/switched off.
 All safety components are connected and operational, including
all thermostats to cut power to the heater if needed.
 Check that the controls enclosure lid is installed and securely
fastened.
 Comms / BMS wiring should be separated from power, controls
and signal wiring.
6.2 Initial start-up
Once all unit inspection checks have been completed and any issues
identified are rectified, the unit can be energised.
1. ▶ Ensure all volume control dampers connected within the
secondary ductwork are fully open.
2. ▶ Switch on the mains power supply to the fancoil and switch
on the fancoil using the switch located on the control panel.
The fancoil unit is ON
3. ▶ To start the fan, the correct control voltage must be applied
to the fan. Refer to TROX technical schedule for
confirmation of guide control voltage.
Appendix C: Local setting of fan speed
The control voltage (0-10Vdc) can be applied to the fan
from the integrated controller (BMS) or from a
potentiometer (if fitted). The typical control voltage should
be between 4 – 7.5Vdc.
CAUTION!
Danger of injury from sharp edges, sharp corners and thin
sheet metal parts!
Sharp edges, sharp corners and thin sheet metal parts may cause
cuts or grazes.
– Be careful when carrying out any work.
– Wear protective gloves, safety shoes, hard hat and safety
glasses.
Initial Commissioning
DANGER!
Electric shock hazard! Electrical equipment carries a
dangerous electrical voltage!
– Only skilled qualified electricians are allowed to work on the
electrical system and to connect the unit to the mains
– Isolate the unit from the mains (all phases) and secure the unit
against inadvertently being energized on again.
– Verify that no voltage is present using an approved voltage
indicator.
– Carry out assembly or connection jobs only as long as no
voltage is present.