Enapter EL 2.1 User manual

Narrow Body EL 2.1 (Rev. A)
Hydrogen Generator (35bar)
Owner’s Manual
Rev. 02 –March 2021

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Release Date
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Narrow Body EL2.1 (REV. A) –Owner's Manual
2021-03-22
EL 2.1 - Owner’s Manual - Rev.02 –Mar 2021 1
PREFACE
Thank you for choosing an Enapter hydrogen generator system. Please study this manual carefully
before attempting to operate the device.
If you have any further questions on the installation of the device, please contact the Enapter support
team. Quote the system serial number when contacting us; you can find the serial number on the
modules' back.
Enapter Srl
Headquarters: Via di Lavoria 56/G
56040 Crespina (PI) –Italy
T.: [phone]
Website: www.enapter.com
VAT no. 13404981006
Scope of the document
This manual provides the installers, users and owners with the information needed to carry out the
installation of the EL2.1 safely and as intended.
Keep this manual in a safe place and readily available. Always follow its instructions. It is the operator's
responsibility to ensure that an installed electrolyser system is in proper condition at all times. Please
observe any additional local requirements applicable to the installation and operation of the hydrogen
generator system. This owner's manual functions as general document and covers installation,
maintenance, and operation.
Approved use
The EL2.1 hydrogen generator system has been designed to produce pure hydrogen that can be used
directly for Fuel Cell or other hydrogen-consuming applications.
According to the specifications and instructions provided in this manual, the unit must only be
operated for this purpose.
Observance of this manual is part of "normal use."

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Table of Contents
Preface ___________________________________________________________________1
Product Overview ___________________________________________________________4
Technical Specifications __________________________________________________________ 6
Safety instructions ______________________________________________________________ 7
List of Hazards _________________________________________________________________ 9
Installation _______________________________________________________________13
Tools, material and accessories required _________________________________________________13
Unpacking _________________________________________________________________________14
EL2.1 Connection Guide _________________________________________________________ 15
Hydrogen Outlet Connection Guide _____________________________________________________18
Purge Connection Guide ______________________________________________________________19
Vent Connection Guide _______________________________________________________________21
Water Inlet Connection Guide__________________________________________________________23
Electrical Connection Guide ___________________________________________________________25
Electrolyser Monitoring Tools ________________________________________________28
Commissioning of the EL2.1 __________________________________________________29
Implementing System Safety_____________________________________________________ 29
Safety areas around the purge and vent outlet ____________________________________________30
Preparing for H2 Production _____________________________________________________ 31
Pairing the Electrolyser to the cloud_____________________________________________________31
Manual refilling of Electrolyte__________________________________________________________31
Control, Functions and System States __________________________________________33
Remote Start/Stop___________________________________________________________________33
Manual Start/Stop ___________________________________________________________________33
Maintenance Mode __________________________________________________________________33
Set Production Rate__________________________________________________________________33
Ramp Up___________________________________________________________________________34
Blowdown Routine __________________________________________________________________35
Anti-Freezing Routine ________________________________________________________________35
Safety Heartbeat ____________________________________________________________________35
Transport, Maintenance and Recycling_________________________________________36
The EL 2.1 Hydrogen Generator is designed to provide many hours of service with minimal maintenance.
Proper care and maintenance by qualified personnel help maximize the operating life of the unit. The
device was designed for easy maintenance and to be a repairable device. The modular design principle
and repairability allow the hydrogen generator systems to be utilised in a large variety of applications,
as well as in off-grid installation with a high degree of confidence. ____________________________36
Routine Maintenance ________________________________________________________________36
Cleaning ___________________________________________________________________________36
Disposal ___________________________________________________________________________37
Transport __________________________________________________________________________37
Appendix_________________________________________________________________38

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Appendix I. Hydrogen Leak Testing ________________________________________________________38
Surface hydrogen testing______________________________________________________________38
Soap bubble testing __________________________________________________________________38
Pressure drop testing_________________________________________________________________38
Appendix II. Preparing the electrolyte solution ______________________________________________39
Appendix III. Draining the EL2.1___________________________________________________________41
Appendix IV. Integration in Cabinets_______________________________________________________42
Appendix V. LED States _________________________________________________________________43
Appendix VI. Error Codes ________________________________________________________________43

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PRODUCT OVERVIEW
Enapter's patented anion exchange membrane (AEM) electrolyser is a standardised, stackable and
flexible system to produce on-site hydrogen. The modular, easily maintainable design –paired with
advanced software integration –allows set up in minutes and remote control and management. To
achieve the required hydrogen production capacity, simply stack this on any housing you wish.
Front Panel
The front panel of the EL2.1 includes all physical connections of the device –allowing for easy access
for installers and maintenance personnel only from one direction.
1) H2O In –please refer to the section "Water and vent line connection instructions" below
-Push-fit female bulkhead connector (8mm OD pipes)
-Requirements: Water input conductivity <20 µS/cm, input pressure = 0.5 → 4 bar
2) O2Vent –please refer to the "Water and vent line connection instructions" below
-Push-fit female bulkhead connector (10mm OD pipes)
-Output: O2/H2gas mixture and water vapour
3) H2Out –please refer to the "Hydrogen Outlet Connection Guide"below
-¼" double ferrule female compression Swagelok tube fitting 1/4" bulkhead (SS-400-61)
-Output: 500 NL/hr of H2, up to 35 bar
4) H2Purge –please refer to the "Purge Connection Guide"below
-¼" double ferrule female compression Swagelok tube fitting 1/4" bulkhead (SS-400-61)
-Output: Up to 20 NL/purge
5) Fill / Drain Port
-CPC quick connector 10 mm

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-Only used during routine maintenance for filling the electrolyte into the device or drain it and
prepare it for transport.
6) Breaker –Integrated magnetothermal circuit breaker to protect the EL2.1 from overcurrent and
short-circuits
7) Power –please refer to the "Electrical Connection Guide"below
8) Safety –please refer to the Errore. L'origine riferimento non è stata trovata.below
9) Ethernet –Connection to access external Modbus control features of the EL2.1
-Find more below by accessing the information online via handbook.enapter.com.
10) ANT. –Antenna port
-This is where a miniature antenna is attached to connect the device to the local network via
Bluetooth and Wi-Fi, enabling real-time updates and monitoring for the user via the Enapter
App and cloud.
-Do not touch the antenna when the device is powered on!
11) Start/Stop
-Manual start and stop button, please refer to the "Manual Start/Stop"section below
12) LEDs
-Status LEDs, please refer to the "LED States section" below
Back Panel
The back panel of the EL 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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TECHNICAL SPECIFICATIONS
EL2.1
Nominal Hydrogen Production
0.5 Nm3/hr
1.0785kg/24 h
Delivery Pressure
Up to 35 barg
Nominal Power Consumption
per Nm3of H2produced
(beginning of life)
4.8 kWh/Nm3
Hydrogen Output Purity
~99.90 % (H2O ≈ 1000 ppm)
Electrical
Nominal power consumption: 2.4 kW (max. 3 kW)
Breaker: C13
Input Water Requirements
Conductivity <20 µS/cm
Process Liquid
1 % KOH solution
Dimensions
W:358 mm D:670 mm H:464 mm
Weight
56.5 kg
Control System Included
EMS
Communications
Wireless (Wi-Fi, Bluetooth), Modbus TCP via Ethernet
Remote Shutdown
Enapter Cloud Service, Enapter App, Modbus TCP, Safety chain
(dry contact)
Safety
Maximum H2contained within
20 NL
Conformity
CE certified according to the machine directive 2006/42/CE
EN ISO 12100 –1
EN ISO 12100 –2
ISO 13849
EN 61010
EN 61000-6-3
EN 61000-6-2
ASME B31:12
Noise at 1 m
≈ 65dB
Ventilation and Safety
Recommendation
Indoor: Ventilation depends on room size, Hydrogen detection
system with a safety circuit is recommended
Outdoor: Protect from outside environmental influences, if
integrated into a cabinet. Ensure the safety concept of each
integrated module is respected.
Environmental
Operating Conditions
5°C to 45°C, up to 95% humidity, non-condensing
IP Rating
20
Interfaces
H2Outlet
1/4“ Swagelok Tube Fitting
Vent Outlet
10 mm Speed fit
Purge Outlet
1/4“ Swagelok Tube Fitting
Water Inlet
8 mm Speed fit
Fill and Drain Port
CPC quick connector 10 mm

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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
Any user, installer and operator must be aware of the following:
1. The machine is not intended to be used in a potentially explosive area
2. We decline any responsibility resulting from improper use of the EL2.1:
a. Caused by the utilisation of poor water quality
b. Caused by supplying too high of a water inlet pressure
c. Caused by leaking gas connections on the front panel of the device (Improper
mounting of tubing)
d. Caused by supplying the wrong voltage to the machine
e. Caused by improper installation of the machine
3. With regards to the design and installation of the hydrogen outlet, purge and vent lines, the
customer must follow Enapter's installation guide, but also ensure full compliance with local
safety guidelines and regulations.
4. It is the installers/users or owner responsibility to regularly check and maintain the purge
and vent lines, as well as to keep the lines free of ice or obstructions.
5. It is the installers/users or owner 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 machine in explosive atmospheres or environments. Do not use the machine
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 shock. Avoid any contact with earthing surfaces.
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 to
a safe distance.
7. Only use demineralised water according to the specification stated in this manual.
8. Never operate the device in confined spaces without additional safety infrastructures, such
as active ventilation or hydrogen detection systems.
9. Always wear personal protection devices:
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. Always wear appropriate PPE when handling
the modules.
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.
10. Always disconnect the machine from electricity before any maintenance and transport.
11. Only use the machine in the way and for the purposes mentioned in this manual. If the
machine is utilised for uses other than what is specified in this manual, unforeseen hazards
may present themselves.
12. Ensure that the back pressure on the Electrolyser (e.g. by a storage tank) never exceeds
35 barg.
13. Use the handles when lifting and moving the device.
14. Never attempt to repair the machine by yourself. The machine must be repaired only by
qualified service specialists who use original spare parts; otherwise, risks may arise for the
operator.
15. Any maintenance activity, excluding the ones listed in the routine maintenance and
installation sections, are only allowed to be performed by authorized trained technicians!
16. Any person working on the system must be familiar with the hazards and risks associated with
installing, commissioning and running the device and attached machines
17. Do not store the unit at temperatures below 1°C. If this occurs, a freezing check sticker placed
on the EL 2.1 Electrolyte bag box will become RED. In this case, please contact Enapter support
team before commissioning the device.

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LIST OF HAZARDS
Any system-operator, -integrator, end-user and technician who operate, service, maintain or install
the device must be aware of the potential dangers associated with its use, in order to implement
sufficient processes in case of an accident or emergency.
Always ensure that the system is installed and operated in compliance with local code,
regulations and standards. Do not install, operate or maintain the system without
explicit knowledge or help from experienced and licensed system integrators, the
manufacturer or external certifying bodies.
Hydrogen hazard
Hydrogen itself is not a hazardous substance –however, its properties can make it hazardous in
interaction with other substances and environments.
It is the User's responsibility to implement a safety system to manage the EL2.1's outputs –more
information about this is below.
Danger of explosion –exploding hydrogen can kill.
Leaking hydrogen can ignite and burn the skin.
High levels of hydrogen concentrations can cause asphyxiation!
Do not inhale hydrogen –be safe.
Do not use without a suitable ventilation and safety system in place!
Incorporate the unit, especially the vent line, into the operational safety
concept.
Avoid heat in the vicinity of the system and the hydrogen source.
No smoking, no naked flames.
Comply with local safety regulations.
In the case of escaping gas, keep away and keep inflammable materials
away.
Prevent electrostatic charging of the device.
Ensure proper installation of the hydrogen supply.
Check the hydrogen lines and connectors regularly for leakages.
Mechanical Hazards
Generic mechanical hazards are often ignored and commonly cause injuries. To avoid this, we
recommend wearing appropriate Personal Protective Equipment (PPE) and using suitable tools at all
times when handling the device and packaging material.
Whilst the handling of the packaging material and preliminary installation does not require specialised
technicians, a general training with regards to lifting heavy loads and general safety briefings are
required to perform these tasks safely.

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Operators must comply with the general safety principles during the handling phases. In particular:
Caution!
Before handling, moving and commissioning the system –assess the hazards
of the operation and study the manual. Appropriate PPE must be worn, such
as cut resistant gloves, safety shoes, protective goggles, etc. depending on
the activity.
Ensure to 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 system is powered on. The unit poses no special electrical hazards,
as long as 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 plug is
fastened into the connector 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
product through the ventilation slots.
•Do not use liquids near the product.
•Never use the product if any part of it has been immersed in water.
•Do not touch the antenna when the unit is powered on, ensure you
are not charged before mounting/dismounting the antenna.
WARNING!
Always turn off the power supply when the product 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 Hydroxide is used in the Electrolyser as the main process liquid (Electrolyte).
This 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. Avoid any
contact with eyes and skin.
If you come into contact with the solution, immediately wash the affected
area and refer to the material safety data sheet of potassium hydroxide
supplied with the Electrolyser.
Attention: Carefully read the instructions contained in this manual before
beginning work. Follow the instructions –if you have any questions, please
contact the Enapter support team.
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,R 36/38, R43, R42
S Phrases: S24-37, S39, S62
(see Safety Material Data Sheet included in the shipment)
Drained solution
Before draining the Electrolyser through the Fill/Drain port, wear appropriate personal protective
equipment. For more information, refer to Appendix III below. Collect the liquid in an appropriate
container and place in a chemical waste container. Do not flush to sewer. Dispose of the liquid in
compliance with applicable local regulations.

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Thermal hazards
Thermal hazards such as burns and scalds for contact with high-temperature surfaces (which can only
present themselves in case of failure of some internal components of the device) can be prevented by
applying the following safety instructions:
•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.
•Never open the device, unless you have been specially trained for service by Enapter.
•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 of particular intensity).
The EL2.1 has not been designed for outdoor use. It is the User's responsibility to protect the system
and all its accessories against atmospheric phenomena such as direct sunlight, rain, snow and
lightning. For more information about the integration of the device in cabinets, please refer to
Appendix IV below.
Acoustic hazards
According to the requirements stated into the Machine Directive 2006/42/EC, the following topics
have been considered:
•The noise level at a workplace of a machine (the emission sound pressure level) has to be
mentioned and specified in the user manual if it exceeds 70 dB(A).
•Sound power has to be determined and declared if the emission sound pressure level exceeds
80 dB(A)
During regular operation, the EL emits a noise level below the maximum
acceptable threshold for long time exposure (80dBA).
However, a sudden purge (either caused by system 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
Please refer to the "Safety instructions" section for a detailed list of instructions –it is required for all
installers and technicians to follow these general set of rules as a minimum precautionary measure to
allow the safe installation and commissioning of the system.
Any person working on the system must be familiar with the hazards and risks associated with
installing, commissioning, and running the EL2.1.
Tools, material and accessories required
The following tools and equipment are needed to set up the device successfully.
Tools
•9/16" combination wrench
•5/8" combination wrench
•Plastic pipe cutter
•Phillips head screwdriver (PH 0x60)
•Stainless steel pipe cutter
•¼" Tube Bender
Material
•Stainless steel AISI 316L- ASTM A269 -1/4” OD X 0,89 mm wt.
•8mm OD LLDPE pipe
•10 mm OD LLDPE pipe
•Pipe push-fit locking clips (8/10 mm)
Accessories (included in the box)
•Electrolyte filling bag (labelled)
•Safety chain jumpers
•Ferrite for power input cable
•Swagelok Nut and Ferrule set
•10mm Check Valve **only needed when connecting multiple Electrolysers**

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Unpacking
The unit has been carefully inspected before shipping. Visual checks for damage and functional tests
should be performed upon receipt.
Please do not dispose of the original shipping materials. We will not accept the unit if returned
without the original shipping boxes or equivalent for safe transport. In the 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 unit should
be returned according to the shipping instruction provided in this manual, in
the section "Transport, Maintenance and Recycling".
Warning!
Never lift the EL2.1 out of the packaging alone. An EL 2.1 weighs over 50 kg.
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.

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EL2.1 CONNECTION GUIDE
The following part will outline the instructions for creating safe connections to and from the EL2.1
Electrolyser. This will also include output management guides, safety-related instructions, and
instructions for connecting power to the device and integrating a non-critical safety chain.
Always ensure that the system is installed and operated in compliance with local code, regulations
and standards. Do not install, operate or maintain the system without explicit knowledge or help from
experienced and licensed system integrators, the manufacturer or external certifying bodies.
If any further questions should arise, please contact the appropriate Enapter service and support
teams who will answer any questions about the installation and integration of the Electrolyser.
Gas connection instructions
All pressurised hydrogen gas connections are Swagelok tube fittings for 1/4" OD tubes. The outlets to
be connected using these instructions are labelled "H2Out" and "H2Purge" on the front panel of the
EL2.1.
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).
Tools required
The following tools and materials are required for this task:
•9/16" Open key wrench
•5/8" Open key wrench
•1/4" Tube
Ensure the material chosen for this task is compatible with Hydrogen operation!
•1/4" Nut and Ferrule (Swagelok)
Instructions
1. Fully insert a ¼ inch 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

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position) is recommended.
Always check each connection for leaks! For more information, please refer to Appendix I below.
Water and vent line connection instructions
H20 IN: The water inlet connector is a push-fit John Guest bulkhead, with an outside diameter of 8mm.
This inlet port is used for the automatic refilling of de-ionised water which is required to be supplied
to the device from a pressurised source.
Follow the below instructions carefully –please refer to the push fittings manufacturers technical
support guide for any further details: Technical Support.
Tools required
The following tools and materials are required for this task:
•Plastic tube cutter
•Push-fit locking clips (8 mm)
•8 mm diameter LDPE tubing
Ensure the tubing chosen for this task is pressure-resistant to at least 4 bar!
Instructions
1. Cut the tube square 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.
Connect the other end of the pipe to the pressurised water supply.
2. Pull the tube to check it is firmly held in place, then secure the connection by inserting the
8mm red fastening clip.
3. To disconnect, ensure the line is depressurised. Then 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.

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O2 VENT:The O2vent outlet is a push-fit bulkhead, with an outside diameter of 10mm. This outlet port
is directly connected to the electrolyte tank, and its primary function is to evacuate the produced
Oxygen. Apart from that, a small quantity of Hydrogen (less than 2%) and up to 25 mL/h of water is
produced. If multiple electrolysers are connected together, a KOH resistant check valve must be
connected directly to the "O2VENT" port with a maximum cracking pressure of 0.02 barg to to avoid
the vent output from one electrolyser to enter another electrolyser. Follow the below instructions
carefully –please refer to the manufacturers technical support guide for any further details: Technical
Support.
Tools required
The following tools and materials are required for this task:
•Plastic tube cutter
•Push-fit locking clips (10 mm)
•10 mm diameter LDPE tubing
Ensure the tubing chosen for this task is pressure-resistant to at least 0.5 barg!
10 mm KOH resistant Check valve for vent line (max crack pressure of 0,02 barg), only in case
of multiple Electrolysers are connected in parallel.
Instructions
1. Cut the tube square 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 be 10 mm Ø. As mentioned previously, this line will have oxygen
in its majority, with a small percentage of hydrogen (less than 2%) and a production of around
25 ml/h of water vapor, which depending on external environmental conditions will condense
inside the line, so it must have a suitable container to retain and drain this water in compliance
with local and national regulations. The "O2VENT" line must be led to an external safety area.
In case multiple Electrolysers are connected together in parallel, insert a small piece of 10 mm
Ø tube and immediately place the check valve as close as possible from the vent outlet, then
continue with the steps previously explained.
2. Pull the tube to check it is firmly held in place, then secure the connection by inserting a red
10mm fastening clip.
3. To disconnect, 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.

Version
Document Title
Release Date
02
Narrow Body EL2.1 (REV. A) –Owner's Manual
2021-03-22
EL 2.1 - Owner’s Manual - Rev.02 –Mar 2021 18
Hydrogen Outlet Connection Guide
Following the steps outlined in the gas connection instructions above, connect the H2Out port, located
at the bottom left of the front panel, directly to your hydrogen storage.
Warning!
All pressurised connections must be inspected and checked for leakages.
Failure to do so significantly increases the risk of explosion.
Enapter is not responsible for any damage caused by improperly installed
equipment.
Several units of EL2.1s can be safely connected
together. In order to manage the hydrogen output,
simply connect as many devices together as needed.
The recommended way to do this is to combine up
to 5 (five) EL2.1s and then connect the H2via a
common output line to the left of the units.
The advantage of this is that the individual
connections do not require piping with strict
tolerances as U-Bend connections are simple to
manufacture and tolerant to deformation, when
compared to straight piping pieces directly
connected in front of the hydrogen generator.
Additional benefits include a prolonged service life
for the pipe fitting connectors and the ability to add
and remove devices from a cabinet without taking all
the piping off. This eases maintenance times and
costs significantly.
In case a higher hydrogen output purity is required,
connect all hydrogen outlets directly to the dryer
inlet, up to the allowed maximum drying flow rate of the dryer. If the drying is not required, it is
recommended to fit valves between the tank and the hydrogen generator to be able to isolate each
component during maintenance.

Version
Document Title
Release Date
02
Narrow Body EL2.1 (REV. A) –Owner's Manual
2021-03-22
EL 2.1 - Owner’s Manual - Rev.02 –Mar 2021 19
Purge Connection Guide
Following the steps outlined in the gas connection instructions above, 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 also periodically during operation, the EL2.1 depressurises and
releases up to 20 litres of hydrogen within 2 seconds. The result is a momentary flow rate of around
10 NL/s which comes out of the H2Purge outlet. Additionally, with each major purge of the device,
between 1-10 ml of water (mostly liquid) is released with the gas.
Attention!
It is not the responsibility of Enapter S.r.l. to install and ensure the purge line
is appropriately managed and maintained. Carefully refer to local rules and
regulations, apply industrial safety standards where possible and assess the
risks associated with the operation of the device!
Attention!
Do not insert any check valves or obstructions into the purge line. This can
cause irreparable damage to your hydrogen system.
Please contact the Enapter support team for questions regarding the purge
line setup.
The released hydrogen will pose a risk of explosion –therefore, it has to be led into a safe area, which
is defined by the absence of any source of ignition. We recommend to lead the purge output to a safe
area, described in the section "Safety areas around the purge and vent outlet" below, and to elevate
the purge outlet to at least 3m above the Electrolyser. If this is not possible, you may also manage the
purge in other ways, such as using a flare stack, burn box or forced dilution.
Warning!
The gaseous outputs from the oxygen vent and the hydrogen purge must be
kept separated. Mixing of these outputs results in an explosive atmosphere.
Warning!
Follow local directives rules and regulations for the safe dispersion of the
purged gas. Ensure a satisfactory safety concept is in place and is being
utilised to manage the hydrogen purge.
It is the installer's/user's or owner's responsibility to regularly check and
maintain the purge line, as well as to keep the line free of ice or obstructions.