Enapter EL 2.1 User manual

EL 2.1
Hydrogen Generator (35bar)
Owner’s Manual
Rev. 02 – June 2020

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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 question 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 back
of the modules.
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.
The unit must only be operated for this purpose, according to the specifications and instructions
provided in this manual.
Observance of this manual is part of “normal use”.

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Table of Contents
Preface ___________________________________________________________________ 1
Product Overview ___________________________________________________________ 3
Technical Specifications __________________________________________________________ 5
Safety instructions ______________________________________________________________ 6
List of Hazards _________________________________________________________________ 8
Installation _______________________________________________________________ 12
Tools, material and accessories required _________________________________________________ 12
Unpacking _________________________________________________________________________ 13
EL2.1 Connection Guide _________________________________________________________ 14
Hydrogen Outlet Connection Guide _____________________________________________________ 16
Purge Connection Guide ______________________________________________________________ 17
Vent Connection Guide _______________________________________________________________ 19
Water Inlet Connection Guide __________________________________________________________ 21
Electrical Connection Guide ___________________________________________________________ 22
Electrolyser Monitoring Tools ________________________________________________ 26
Commissioning of the EL2.1 __________________________________________________ 27
Implementing System Safety _____________________________________________________ 27
Safety areas around the purge and vent outlet ____________________________________________ 28
Preparing for H2 Production _____________________________________________________ 29
Pairing the Electrolyser to the cloud _____________________________________________________ 29
Manual refilling of Electrolyte __________________________________________________________ 29
Control, Functions and System States __________________________________________ 31
Remote Start/Stop ___________________________________________________________________ 31
Manual Start/Stop ___________________________________________________________________ 31
Maintenance Mode __________________________________________________________________ 31
Transport, Maintenance and Recycling _________________________________________ 32
Routine Maintenance ________________________________________________________________ 32
Cleaning ___________________________________________________________________________ 33
Disposal ___________________________________________________________________________ 33
Transport __________________________________________________________________________ 33
Appendix _________________________________________________________________ 35
Appendix I. Hydrogen Leak Testing ________________________________________________________ 35
Appendix II. Preparing the electrolyte solution ______________________________________________ 36
Appendix III. Draining the EL2.1 ___________________________________________________________ 37
Appendix IV. Integration in Cabinets _______________________________________________________ 38
Appendix V. LED States _________________________________________________________________ 40

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PRODUCT OVERVIEW
Enapter’s patented anion exchange membrane (AEM) electrolyser is a standardized, 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 electrolyser inside standard 19”
racks or 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, as well as simple integration into
standard 19” racks and cabinets.
1) H2O In
- John Guest bulkhead connector (8mm)
- Requirements: Water input conductivity <20 µS/cm, input pressure = 0.5 → 4 bar
2) O2 Vent – please refer to the Vent Connection Guide below
- John Guest bulkhead connector (10mm)
- Output: O2/H2 gas mixture and water vapour
3) H2 Out – please refer to the Hydrogen Outlet Connection Guide below
- Swagelok tube fitting 1/4” bulkhead (SS-400-61)
- Output: 500 NL/hr of H2, up to 35 bar
4) H2 Purge – please refer to the Purge Connection Guide below
- Swagelok tube fitting 1/4” bulkhead (SS-400-61)
- Output: Up to 20 NL/purge
5) Electrolyte

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- CPC quick connector 10 mm
- Only used during routine maintenance for filling the electrolyte into the device
6) Drain
- CPC quick connector 6 mm
- Only used during routine maintenance to drain the EL2.1, and to prepare the device for
transport.
7) Breaker – Integrated magnetothermal circuit breaker to protect the EL2.1
8) Power – please refer to the Electrical Connection Guide below
9) Safety – please refer to the Safety Chain Connection Guide (Optional) below
10) Ethernet – Connection to access external Modbus control features of the EL2.1
- Find more below by accessing the information online via handbook.enapter.com.
11) 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!
12) Start/Stop
- Manual start and stop button, please refer to the Manual Start/Stop section below
13) LEDs
- Status LEDs, please refer to the LED States section below
14) USB – For maintenance use only.
- Do not use without prior notification and assistance from trained Enapter service personnel!
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 Nm
3
/hr
1 kg/24 h
Delivery
Pressure
Up to 35 barg
Nominal Power Consumption
per Nm3 of H2 produced
(beginning of life)
4.6 kWh/Nm3
Hydrogen Output Purity ~99.90 % (H2O ≈ 1000 ppm)
Electrical
Nominal power consumption: 2.2 kW (max. 3 kW)
Breaker: C13
Input Water
Requirements
Conductivity
<20
µ
S
/cm
Process Liquid 1 % KOH solution
Dimensions L:482mm H:307mm W:595mm
Weight 55 kg
Control System Included EMS
Communications Wireless (Wi-Fi, Bluetooth), Ethernet, Modbus TCP
Remote Shutdown
Enapter Cloud Service, Enapter App, Modbus TCP, Safety chain
(dry contact)
Safety
Maximum H2 contained within 20 NL
Conformity
CE certified according to the m
achine 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 <60dB
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
H
2
Outlet
1/4 “
Swagelok Tube Fitting
Vent Outlet 10 mm John Guest Speed fit
Purge Outlet 1/4 “ Swagelok Tube Fitting
Water Inlet 8 mm John Guest Speed fit
Fill and Drain Port
CPC quick connector 6 mm drain
CPC quick connector 10 mm KOH refilling

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S
AFETY 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 utilization 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 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 owners 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 owners 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.
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.

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2. Do not use the machine in explosive atmospheres. 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 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 demineralized 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 when 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. Use the handles when lifting and moving the device.
13. Never attempt to repair the machine by yourself. The machine must be repaired only by
qualified people who use original spare parts; otherwise, risks may arise for the operator.
14. Do not store the unit at temperatures below 2°C.

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L
IST OF
H
AZARDS
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 a 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.
The lab/room must be equipped for hydrogen monitoring.
Avoid heat in the vicinity of the system and the hydrogen source.
No smoking, no naked flames.
Comply with local safety regulations.
Comply with regulations for the handling of compressed hydrogen
cylinders.
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.
Operators must comply with the general safety principles during the handling phases. In particular:

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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 our 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
The hydrogen generating process makes use a chemical substance, Potassium Hydroxide, in order to
enhance the efficiency of the electrolyser.
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 from the systems must be informed about any potential hazards
involved with their 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 in
structions below before beginning work.
Follow the instructions – 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 its contents.
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, R22 – R 35
(see Safety Material Data Sheet included in the shipment)
Drained solution
Before emptying of the process tank, 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 local and
national 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 authorized 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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I
NSTALLATION
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
 Stainless steel pipe cutter
 ¼” Tube Bender
Materials
 Stainless steel AISI 136- ASTM A269 -1/4” X 0,89
 8mm Ø LLDPE pipe
 10 mm Ø LLDPE pipe
 3.5L of 1% potassium hydroxide (KOH) solution
Accessories
 Electrolyte filling material (labelled)
 Safety chain jumpers
 Ferrite for power input cable

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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 on 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 C
ONNECTION
G
UIDE
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 to 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” tubes. The outlets to be
connected using these instructions are labelled “H
2
Out” and “H
2
Purge” 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
The O
2
vent outlet and the water inlet connections are John Guest push-fit bulkheads, with a diameter
of 10 mm and 8 mm, respectively. The lines to be connected using these instructions are labelled “O
2
VENT” and “H
2
O IN” on the front panel of the EL2.1.
Follow the below instructions carefully – please refer to the John Guest manufacturers technical
support guide for any further details: John Guest Technical Support.
Tools required
The following tools and materials are required for this task:
 Plastic tube cutter
 John Guest push-fit locking clips (8 mm / 10 mm)
 8 mm / 10 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. The
inserted pipe diameter must be 8 or 10 mm Ø for the automatic refilling and vent port,
respectively.
2. Pull the tube to check it is firmly held in place, then secure the connection by inserting a red
fastening clip, provided with the shipment.
3. To disconnect, ensure the line is depressurized. 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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Hydrogen Outlet Connection Guide
Following the steps outlined in the gas connection instructions above, connect the H
2
Out 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 in a 19” rack and to
then connect the H
2
Out connectors via 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. 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.

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Purge Connection Guide
Following the steps outlined in the gas connection instructions above, connect the H
2
purge 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 depressurizes and
releases up to 20 litres of hydrogen within 2 seconds. The result is a momentary flow rate of around
36 Nm
3
/hr which comes out of the H
2
Purge 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 with regard to 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 3 m height. 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 a significant risk of
explosion!
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.

Version Document Title Release Date
0
2
E
L2.1
–
Owner’s Manual
2020
-
06
-
15
EL 2.1 - Owner’s Manual - Rev.03 – Jun 2020 18
Several units of EL2.1s can be safely
connected together. In order to manage the
hydrogen purge in a simple way, simply
connect as many devices together as needed.
The recommended way to do this is to
combine up to 5 (five) EL2.1s in a 19” rack and
to then connect the purge lines via a common
line. If a dryer is also integrated, its purge
outlet can be connected in parallel to the
installed Enapter hydrogen generators.
The common purge line on the side of the
devices offers the advantage that individual
connections do not require piping with strict
tolerances as U-Bend connections are simple
to manufacture and tolerant to deformation,
compared to straight piping connections.
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.
Never obstruct the output of the purge – do not place any check valves, or other system components
which stop the flow of air to equalise the internal stack pressure, into the purge line.
Please be aware that when larger hydrogen systems are created by putting together several
modules, the piping downstream may have to be sized differently. It is the customer’s/system
integrator’s responsibility to ensure adequately sized purge piping is selected, which does not limit
the purge flow. The customer/system integrator must ensure that the purge outlet satisfies all
relevant local rules and regulation, in terms of noise emission, risk assessments, maintenance and all
other relevant areas.

Version Document Title Release Date
02 EL2.1 – Owner’s Manual 2020-06-15
EL 2.1 - Owner’s Manual - Rev.03 – Jun 2020 19
Vent Connection Guide
Following the steps outlined in the water and vent connection instructions above, connect the “O
2
Vent” port, located at the top left of the front panel to your oxygen vent outlet.
The O
2
vent line presents the most demanding line management. Please study this section carefully.
The oxygen vent line carries the produced oxygen out of the electrolyser. However, due to the
hydrogen crossover inside the AEM stack, the gas output from this line has a maximum concentration
of 2% hydrogen. The remaining output comes in the form of water vapour, which often condenses in
the line resulting in a water output of around 10-20 ml/hr.
Warning!
Do not insert obstructions into the vent line. This can cause irreparable
damage to your hydrogen system. Ensure that the condensed water is not
allowed to accumulate in the vent pipe and can drain out of the line safely.
Regularly check the vent line for a build-up of obstructions.
Please contact the Enapter support team for questions regarding the vent
line setup.
Attention!
The total pressure loss inside the vent line can never exceed 0.5 bar –
minimise pressure losses. If the backpressure inside the line builds up, the
system will go into error mode – however, permanent damage to the
system can occur from overpressures.
Enapter is not responsible for any damage caused to the system from
mismanaged vent line arrangements.
To connect a device, create a connection using 10 mm LDPE pipe to the port labelled “O
2
Vent”. Several
units of EL2.1s can be safely connected together; simply connect the devices together as needed, via
a 10 mm vent line which should run vertically along the side of the electrolysers.