Enapter EL User manual

Owner’s Manual
Electrolyser
Rev. 00 –September 2021

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EL –Owner’s Manual – Rev.00 –September 2021 I
CHANGE HISTORY
Rev.
Status
Date
Revision memo
Created/changed by
00
IFP
21/09/2021
First approved version
Philipp Endres

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PREFACE
Thank you for choosing Enapter. Please study this manual carefully before unpacking, installing, and
operating the device.
If you have any further questions, please contact the Enapter customer support team. Quote the
device serial number and hardware number on the back of the device to help identifying your product
quickly.
Enapter Srl
Headquarter: Via di Lavoria 56/G
56040 Crespina (PI) –Italy
T.: [phone]
E.: [email protected]om
Website: www.enapter.com
VAT no. 13404981006
Scope of the document
This manual provides information needed to carry out the installation and usage of your Enapter
device safely and as intended.
Keep this document in a safe place and readily available. Always follow its instructions. It is the
operator’s responsibility to ensure that an installed device is always in proper conditions. Please
observe any additional local requirements applicable to the installation and operation of hydrogen
devices.
Approved use
This device must only be operated for its intended purpose, according to the specifications and
instructions provided in this document.
Observance of this document is part of “normal use”.
Danger of injury due to improper use!
Improper use of the device can result in serious injuries and damage to the
environment.
•Always use the device according to the specifications described in this
document. Ensure that the manual is always accessible.
•Make sure you have read and understood this document in its
entirety.
•Comply with all safety instructions and warnings.
•Store the manual and other documentation in a safe and accessible
place and pass them on to future owners and operators of the device.
•Comply with all local regulations.
•Enapter is not guaranteeing efficiency, safety, and functionality in
case of modifications not described in this document.
•Enapter is not responsible for any damage caused by the device or to
the device based on wrong operation or setup.

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Terms
The following terms are used in this document:
•Device: Device means the unit, including its hardware and software as well as contained
materials and substances. It also includes directly attached tubes, pipes, and other equipment
from Enapter if not stated differently.
•System: System means the combination of devices, tubes, pipes and equipment from Enapter
and other manufacturers which are connected physically, logically or in any other way to
produce, store, use, transfer or convert hydrogen and related substances.
•Operator: The operator is the responsible person in charge who operates, installs, connects,
maintains, and/or owns the device, its subcomponents, and additional components. To
simplify reading, this document only refers to the operator to distinguish from Enapter but
may also include the user, customer, client, owner, installer, instructor, system integrator or
persons who are responsible for a safe operation of the device.

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Table of Contents
Change history....................................................................................................................... I
Preface .................................................................................................................................II
Overview of the Electrolyser................................................................................................. 1
Safety instructions................................................................................................................ 3
List of Hazards............................................................................................................................... 6
Installation of the Electrolyser............................................................................................ 10
Unpacking................................................................................................................................... 10
Tools, material and accessories required .................................................................................... 10
Implementing System Safety ...................................................................................................... 11
Instructions for connecting stainless steel tubes ........................................................................ 12
Instructions for connecting plastic tubes .................................................................................... 15
Electrical Connection Guide (POWER)......................................................................................... 23
Initial operation of the electrolyser ............................................................................................ 26
Control, Functions and System States of the Electrolyser ................................................... 29
Enapter Monitoring Tools................................................................................................... 32
Maintenance of the Electrolyser......................................................................................... 33
Appendix ............................................................................................................................ 35
Appendix I. Hydrogen Leak Testing.........................................................................................................35
Appendix II. Preparing the electrolyte solution.......................................................................................36
Appendix III. Draining the electrolyser....................................................................................................38
Appendix IV. LED States..........................................................................................................................39
Appendix V. Error Codes.........................................................................................................................39

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OVERVIEW OF THE ELECTROLYSER
Enapter’s patented anion exchange membrane (AEM) electrolyser is a standardised, stackable, and
flexible device to produce hydrogen. The modular, easily maintainable design –paired with advanced
software integration –allows set up in minutes and remote control and management.
Specifications
The specifications of the electrolyser can be found in the datasheet. It can be downloaded here:
Datasheet of the electrolyser.
Front Panel
EL2.1 LC front side
EL2.1 NB DC front side
The front panel of the electrolyser includes all physical connections of the device.
1. H2O In –please refer to the section Water Inlet Connection Guide
•Push-fit female bulkhead connector (8mm outer diameter pipes)
•Input: Filtered water input with a conductivity < 20 µS/cm at 25°C, input pressure
between 1 and 4 bar
2. O2Vent –please refer to the Vent Connection Guide
•Push-fit female bulkhead connector (10mm outer diameter pipes)
•Output: O2with water vapour and traces of H2
3. Cooling Water IN/OUT –please refer to the Cooling Loop Connection Guide
•Only available in the liquid cooled electrolysers (LC versions)
•Push-fit female bulkhead connector (10mm outer diameter pipes)
•Input/Output: cooling water to cool down the device
4. H2Out –please refer to the Hydrogen Outlet Connection Guide
•¼" double ferrule Swagelok tube fitting bulkhead (SS-400-61)
•Output: 500 NL/hr of H2, up to 35 barg
5. H2Purge –please refer to the Purge Connection Guide
•¼" double ferrule Swagelok tube fitting bulkhead (SS-400-61)
•Output: Periodical purge of up to 20 NL, H2and water

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6. Fill / Drain Port
•CPC quick connector 10 mm
•Only used during routine maintenance for filling the electrolyte into the device or for
draining and preparing it for transport.
7. Breaker –please refer to the Electrical Connection Guide
•Integrated magnetothermal circuit breaker to protect the electrolyser from
overcurrent and short-circuits.
8. Power –please refer to the Electrical Connection Guide
9. Dry Contacts –please refer to the Dry Contact Connection Guide
10. Ethernet –Connection to access external Modbus control features of the electrolyser. Find
more in the chapter below.
11. ANT. –Antenna port SMA male
•The device can be connected to the local network via Bluetooth and Wi-Fi, enabling
real-time updates and monitoring for the operator via the Enapter App and cloud. A
miniature antenna can be attached to this port to increase the amplification.
•Do not touch the port when the device is powered on!
12. Start/Stop –please refer to the Manual Start/Stop section below
•Manual start and stop button to start and stop the device
13. LEDs –please refer to the Appendix IV
•Status LEDs to show device status
14. Air Inlets –please refer to the Routine Maintenance
Back Panel
EL2.1 back side
EL2.1 NB DC back side
The back panel of the device is used to blow out warm air. Please leave at least 30 cm space behind
the module to allow for adequate airflow. Never obstruct the ventilation openings!

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SAFETY INSTRUCTIONS
Warnings and Hazards
The following terms and symbols are used in this manual to indicate important text passages which
must be given particular attention:
Warns of fatal/serious injury
Warns of injury
Warns of physical damage to the product
Do not open or dismantle
Keep away from sources of heat and ignition.
No naked flames
No smoking
Minimum two persons required to handle the item
Wear Personal Protective Equipment
Wear hearing protection
General safety
The operator must be aware of the following:
1. The device is not intended to be used in a potentially explosive area
2. Enapter is not responsible for improper use:
•Caused by wrong inputs
•Caused by wrong input pressures
•Caused by improper mounting or tubing (e.g. leaking gas connections)
•Caused by connecting the wrong power supply (e.g. wrong voltage)
•Caused by improper installation
3. Regarding design and installation, the operator must follow Enapter’s installation rules, and
ensure full compliance with local safety guidelines and regulations.
4. It is the operator’s responsibility to regularly check and maintain all outlet lines, as well as to
keep the lines free of ice or other obstructions.
5. It is the operator’s responsibility to regularly check and clean the air intakes and outlets of
the device, as well as to keep the air inlets/outlets free of obstructions.

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The following rules should always be observed:
1. Keep the work area clean. Clutter can create hazards around the device. Keep the work area
well illuminated.
2. Do not use the device in explosive atmospheres. Do not use the device near flammable
substances.
3. Handle the power supply cable with care. Do not pull the electric cable to disconnect it from
the plug without removing power from it first. Keep the electric cable away from heat, oil,
water, and sharp edges.
4. Protect yourself from electric shocks. Avoid any contact with earthingsurfaces.
5. Never expose the device to rain or very damp conditions.
6. Keep children and people without explicit knowledge of the device and its function away at
a safe distance.
7. Never operate the device in confined spaces without additional safety infrastructures, such
as active ventilation or hydrogen detection systems.
8. Always protect yourself:
a. Wear protective goggles and nitrile gloves when handling the electrolyte solution.
b. Wear ear muffs or plugs in noisy areas.
c. Wear gloves when handling the device.
d. Wear appropriate footwear when handling the device.
e. Use lifting aids if available when lifting the device. Never lift the device alone. Know
your local and site-specific health and safety rules and act accordingly.
9. Always disconnect the device from electricity before cleaning, disassembly, and transport.
10. Only use the device in the way and for the purposes mentioned in this manual. If the device
is employed for uses other than what is specified in this manual, unforeseen hazards may
occur.
11. Use the handles when lifting and moving the device.
12. Never attempt to repair the device by yourself. The device must be repaired only by qualified
specialists who use original spare parts.
13. Any maintenance activity, excluding the ones listed in the routine maintenance and
installation sections, are only allowed to be performed by authorized trained technicians!
14. Any person working on the device must be familiar with the hazards and risks associated with
installing, commissioning, and running the device and attached devices.
15. Do not store the device at temperatures below 1°C.

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Additional safety for the electrolyser
The following rules should always be observed. It is the operator’s responsibility to ensure that every
person, working with the device is following these rules:
1. Do not attach filled tanks or other equipment with pressures higher than the device’s
maximum outlet pressure to the H2outlet of the device.
2. Do not provide water which does not meet the minimum purity requirements.
3. Do not provide water with a pressure higher than the maximum allowed pressure.
4. Make sure that the H2purge line and the O2 vent line are never obstructed.
Additional safety for the dryer
The following rules should always be observed. It is the operator’s responsibility to ensure that every
person working with the device is following these rules:
1. Do not attach filled tanks or other equipment with pressures higher than the device’s
maximum outlet pressure to the H2outlet of the device.
2. Do not attach hydrogen sources other than the electrolysers specified by Enapter.
3. Make sure that the H2purge line is never obstructed.

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LIST OF HAZARDS
The operator who operates, services, maintains, or installs this device must be aware of the potential
dangers associated with its use and set up, the required materials, as well as the inputs and outputs,
to implement sufficient countermeasures and processes to prevent accidents and act correctly in case
of emergencies.
Always ensure that the device is installed and operated in compliance with local code,
regulations, and standards. Do not install, operate, or maintain the device without explicit
knowledge or help from experienced and licensed system integrators, the manufacturer,
or external certifying bodies.
Hydrogen hazard
It is the operator’s responsibility to implement a safety system to manage the devices inputs and
outputs –more information about this is below.
Hydrogen can explode!
Hydrogen can leak, ignite, and burn!
Do not inhale hydrogen!
Hydrogen can cause asphyxiation!
Do not handle hydrogen without a suitable ventilation and safety system!
Incorporate the device, especially the hydrogen and the purge lines, into the
operational safety concept!
Avoid heat in the vicinity of the device.
Do not smoke and do have naked flames in the vicinity of the device.
Do not have hydrogen, not even in low concentrations in the vicinity of the
device.
Comply with local safety regulations.
Comply with regulations for the handling of compressed hydrogen cylinders.
In the case of escaping gas, stay away and keep inflammable materials away.
Prevent electrostatic charging of the device.
Ensure proper installation of the supply pipes.
Check the hydrogen lines and connectors regularly for leakages.
Mechanical Hazards
It is always necessary to wear appropriate Personal Protective Equipment (PPE) and to use suitable
tools when handling the device and packaging material.
A general training with regards to lifting heavy loads and general safety briefings are required to
perform the tasks described in this manual safely.
Operators must comply with the general safety principles during the handling phases. In particular:
Caution!
Before handling, moving, and commissioning the device –assess the hazards
of the operation and study the manual. Appropriate PPE must be worn, such

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as cut resistant gloves, safety shoes, protective goggles, etc. depending on
the activity.
Clear the area of work before starting to mount the device.
The device is heavy and must be lifted by at least 2 people –plan around this
and allow ample space to move around.
Do not lift the device over your head.
Caution!
During handling of the device, be cautious and use the handles on the device
to minimise the mechanical risks, such as:
•Impacts and crushing injuries due to uncontrolled movements of the
load.
•Dropping the device, causing crushing injuries
•Loss of stability, leading to entanglements and other injuries.
The packaging/device must be handled by at least two people.
Electrical hazards
Do not touch the antenna when the device is powered on. The device poses no special electrical
hazards, if the following instructions on safety measures are observed and the Electrical Connection
Guide below is applied correctly:
Caution!
•Handle the electrical installation with care. Ensure that the power
plug is fastened correctly into the socket to avoid any loosening of
the wiring.
•Use only the supply voltage specified on the rear of the device.
•Do not short-circuit inputs and outputs.
•Do not reverse the polarity of inputs and outputs.
•Do not insert any mechanical parts, especially metal parts, into the
device through the ventilation slots or other openings.
•Do not use liquids near the device.
•Never use the device if any part of it has been immersed in water.
•Do not touch the antenna when the device is powered on, ensure
you are electrostatically discharged when mounting/dismounting
the antenna.
WARNING!
Always turn off the power supply when the device is being cleaned,
maintained, or transported.
Any servicing, other than cleaning and routine user maintenance, must be
performed by trained, Enapter-endorsed technicians.

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Chemical hazards
Potassium Hydroxyde is used in the electrolyser as the main process liquid (electrolyte). In case of
failures, it can also be present inside or outside connected or nearby devices.
The electrolyte is typically delivered pre-mixed with the electrolyser but is sometimes provided as a
powder to be diluted. For more information on this process, please refer to Appendix II below.
Warning! Refer to the Material Safety Data Sheet (MSDS) of all chemicals
used before handling them. All persons mixing, draining, and handling the
electrolyte must be informed about any potential hazards involved with
these activities.
Attention: Wear appropriate Personal Protective Equipment (PPE). Avoid any
contact with eyes and skin.
If you got in contact with the solution, immediately wash the affected area
and refer to the material safety data sheet of potassium hydroxide supplied
with the electrolyser.
Ensure all material used to store and contain your electrolyte solution is
chemically compatible with it.
In the event of physical contact with the undiluted substance, refer to the material safety data sheet
of potassium hydroxide and follow the instructions below.
First Aid Recommendations
•In the event of skin contact, take off contaminated clothing
immediately. Wash off with soap and plentiful water. Consult a doctor.
•In the event of eye contact, rinse carefully with plentiful water for at
least 15 minutes, and consult a doctor.
If ingested, do not administer anything to people that have fainted. Rinse
mouth with water. Consult a doctor immediately.
Chemical information
Substance: Potassium Hydroxide
CAS no.: 1310-58-3
EC no.: 215-181-3
Classification: C.
R Phrases: R22, R36/38, R43, R42
S Phrases: S24-37, S39, S62
(see Safety Material Data Sheet included in the shipment)

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Thermal hazards
Thermal hazards such as burns and scalds from contact with high-temperature surfaces can be
prevented by following the following safety instructions:
•Never open the device unless you have been specially trained for service by Enapter.
•Ensure the device can only be accessed by authorised and trained personnel.
•Operators and maintenance personnel must wear appropriate Personal Protective Equipment
(PPE) when handling the device.
•Remove the supply of power before any service, transport, and installation of the device.
•Any servicing, other than cleaning and user maintenance must be performed by specialist
personnel and with the power supply switched off.
Environmental hazards
The device has been designed for use in standard ambient conditions, respecting stability
requirements (in the absence of seismic or hydrogeological events).
The device has not been designed for outdoor use. It is the operator’s responsibility to protect the
device and all its accessories against atmospheric phenomena such as direct sunlight, rain, snow, and
lightning.
Acoustic hazards
According to the requirements stated into the Machine Directive 2006/42/EC, the following topics
have been considered:
During regular operation, the device emits a noise level below the maximum
acceptable threshold for long time exposure (80dBA).
However, a sudden purge (either caused by device shut down or unforeseen
error) can be louder than 85 dB, depending on the purge line installation. Due
to this, Enapter recommends wearing PPE (earplugs) while working around
the device.

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INSTALLATION OF THE ELECTROLYSER
Any person working on the device must be familiar with the hazards and risks associated with
installing, commissioning, and running it.
UNPACKING
The device has been carefully inspected and tested before shipping. Visual checks for damage and
functional tests should be performed upon receipt.
Please do not dispose the original shipping materials. Enapter will not accept devices if they are
returned without the original shipping boxes or equivalents for a safe transport. In case that you
cannot keep the shipping boxes, please recycle responsibly.
Attention! If any damage has occurred during transport, please report this
immediately to the shipping agent and supplier. Afterwards, the device
should be returned according to the shipping instructions provided in this
manual, in the section “Transport, Maintenance and Recycling”.
Warning!
Never lift the device out of the packaging alone. The device weights over
50 kg. Please see the datasheet for more details.
Use lifting aids if available.
Due to their weight and size, it is recommended to use a pallet cart or similar
devices to manoeuvre the box upon delivery.
If the box must be lifted somewhere, always lift with at least two persons.
TOOLS,MATERIAL AND ACCESSORIES REQUIRED
The following tools, equipment, and material are needed to connect the device successfully. Ensure
the material chosen for this task is compatible with hydrogen operation.
Tools
•9/16” combination wrench
•5/8” combination wrench
•Plastic pipe cutter
•Slotted screwdriver
•Stainless steel pipe cutter
•¼” tube bender

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Material
•Push-fit locking clips (8 mm + 10 mm)
•8 mm + 10 mm diameter LDPE tubing (ensure the 8 mm tubing is pressure-resistant to at least
4 bar!)
•Stainless steel AISI 136- ASTM A269 -¼” outside diameter X 0,89 mm w.t.
Accessories (included in the box)
•10mm Check Valve **only needed when connecting multiple electrolysers in parallel**
•Electrolyte filling bag (labelled)
•Dry contact jumpers
•Ferrite cylinder for power input cable
•Swagelok Nut and Ferrule set
IMPLEMENTING SYSTEM SAFETY
Each connection to and from the device must be inspected and tested. Additional system engineering
might be required to ensure safe operation.
Always follow best practices, apply your local codes of regulation (if applicable), and follow industry
standards for the implementation of safety systems to manage the risks of running electrolysers and
storing hydrogen.
Gas containing pipes must be properly connected to the specific ports, tested by the operator, and
directed to separate safe areas. If this is not possible, the operator must find another safe solution,
such as using a flare stack, burn box, or forced dilution. When forced dilution is utilised, all components
used in this process must not be able to ignite the hazardous substances.
Warning!
It is the operator’s responsibility to ensure good engineering practices are
applied to the hazardous substances which are released during the operation
of the device!
The operator must ensure that the outlets satisfy all relevant local rules and
regulation, in terms of noise emission, risk assessments, maintenance and all
other relevant areas.

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Safety areas around the purge and vent outlet
Generally, there are two options. The extents of this safety area depend on different parameters, for
example, the diameter and the length of piping leading to the safe area, the vent spout design, exit
velocity and wind conditions.
Preferably, the operator:
1. calculates the measurements of the safety area based on the provided data for each specific
output and applies industrial standards such as the following to their system design, safety
concept and site documentation.
•EIGA Doc 211/17: Hydrogen Vent Systems for Customer Applications
•CGA G5.5: Hydrogen Vent Systems
•ISO/TR 15916:2015: Basic considerations for the safety of hydrogen systems
2. Or follows the recommendations of Enapter for systems consisting of up to ten electrolysers
and two dryers. The safety area is cylindrical and has a height of 10 meters and a radius of 5
meters. Note that depending on the design of the purge piping and exit velocity, this area also
extends in the direction of the ground by at least 1 meter.
3. Never place the vent outlet near the purge outlet to minimise the risk of explosion. Leave at
least 3 meters of space between the gas outlets.
INSTRUCTIONS FOR CONNECTING STAINLESS STEEL TUBES
All pressurised hydrogen gas connections are Swagelok tube fittings for ¼” outside diameter (OD)
tubes. The outlets to be connected according to these instructions are labelled “H2Out” and “H2
Purge” on the front panel of the device.
Follow the below instructions carefully –please refer to the Swagelok manufacturers installation guide
for any further details: An Installer's Pocket Guide for Swagelok® Tube Fittings (MS-13-151).
1. Fully insert a ¼”stainless steel tube into the bulkhead union, with the nut and ferrule in place
on the fitting.
2. Rotate the nut finger-tight, then mark the 6 o’clock position on the nut.
3. Hold the fitting body steady on the device using the 5/8” open key wrench.
4. While holding the fitting body steady, tighten the nut one and one quarter turns to the
9 o’clock position with the 9/16” open key wrench.
5. To ensure a leak-proof connection is made, another quarter-turn of the nut (to the 12 o’clock
position) is recommended.
Always check each connection for leaks! For more information, please refer to Appendix I below.

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Hydrogen Outlet Connection Guide (H2OUT)
Connect the H2Out port, located at the bottom left of the front panel, directly to a hydrogen
storage.
Multiple electrolysers can be connected to a common line by combining the electrolysers in a 19” rack
via a common output line to the left of the devices and then connecting this H2line with the lines of
other racks.
Three EL2.1 LC with common H2 OUT
Three EL2.1 DC with common H2 OUT
Warning!
All pressurised connections must be inspected and checked for leakages.
Failure to do so significantly increases the risk of explosion.
Enapter declines responsibility for any damage caused by improperly installed
equipment.

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Purge Connection Guide (H2PURGE)
Connect the H2purge port, located at the bottom left
of the front panel, to your hydrogen purge outlet.
During ramp-up, after ramp down and in regular
intervals during operation, the electrolyser
depressurises and releases up to 20 litres of hydrogen
within 2 seconds with a loud noise through the purge
line. Please wear PPE earplugs when being close to
the devices. Purging is necessary to release the water
which has been extracted from the hydrogen.
EL2.1 LC with common H2 PURGE
EL2.1 NB DC with common H2 PURGE
H2 OUT and H2 PURGE

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Never obstruct the output of the purge –do not place any check valves, or other
system components which might block or close the line. Make sure that no obstacles
including the purged water and ice are blocking the line. It must always be at
atmospheric pressure. If necessary, use a water trap and heater to avoid pressure
from building up.
Please be aware that when larger hydrogen systems are created by putting together
several modules, the piping downstream may have to be sized accordingly. It is the
operator’s responsibility to ensure adequately sized piping is selected, which does
not limit the air flow. The operator must ensure that the outlet satisfies all relevant
local rules and regulation, in terms of noise emission, risk assessments, maintenance,
and all other relevant areas.
Attention!
If a backpressure inside the line builds up, the device will get permanently
damaged.
Enapter is not responsible for any damage caused to the device from mismanaged
piping arrangements.
INSTRUCTIONS FOR CONNECTING PLASTIC TUBES
1. Cut the tube perpendicular to the axis and remove sharp edges. Ensure the outside diameter
is free of score marks, and the cut is perpendicular across the tube. Fully insert the tube into
the fitting. The inserted pipe diameter must match the fitting.
2. Pull the tube to check it is firmly held in place, then secure the connection by inserting a red
fastening clip.
3. To disconnect, ensure that the line is depressurised. Then, remove the red fastening clip and
push the collet against the fitting, while simultaneously pushing the tube into the fitting.
Holding the collet in this position, pull the tube out of the fitting in one smooth motion.