Enapter Electrolyser 4.0 User manual

Owner’s Manual
Electrolyser 4.0
Please study this manual carefully before unpacking, installing, and operating the device.
Rev. 00 –September 2022

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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.: [e-mail]
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”.
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 relevant local safety guidelines, rules, directives and regulations.

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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.
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
Preface................................................................................................................................... I
Enapter Srl...................................................................................................................................... I
Scope of the document................................................................................................................... I
Approved use ................................................................................................................................. I
Terms II
Table of Contents ................................................................................................................. III
1.Overview of the Electrolyser................................................................................................ 1
1.1 Specifications ..................................................................................................................... 1
1.2 FRONT PANEL & Bottom..................................................................................................... 4
1.3 BACK PANEL ....................................................................................................................... 7
2.Safety instructions .............................................................................................................. 8
2.1 Warnings and Hazards........................................................................................................ 8
2.2 General safety.................................................................................................................... 9
2.3 Additional safety for the electrolyser ................................................................................ 11
3.Hazards............................................................................................................................ 12
3.1 Hydrogen hazard.............................................................................................................. 12
3.2 Mechanical hazards.......................................................................................................... 12
3.3 Electrical hazards.............................................................................................................. 13
3.4 Chemical hazards ............................................................................................................. 14
3.5 Chemical information ....................................................................................................... 15
3.6 Thermal hazards............................................................................................................... 16
3.7 Environmental hazards..................................................................................................... 16
3.8 Acoustic hazards............................................................................................................... 16
4.Installation of the Electrolyser........................................................................................... 17
4.1 Unpacking ........................................................................................................................ 17
4.2 Tools, material and accessories required .......................................................................... 17
4.3 Implementing System Safety ............................................................................................ 19
4.4 Piping and Instrumentation Diagram (P&ID)...................................................................... 20
4.5 Instructions for connecting stainless steel pipes................................................................ 20

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4.6 Instructions for connecting plastic tubes........................................................................... 24
4.7 Electrical Connection Guide (POWER)............................................................................... 33
4.8 Dry Contact Connection Guide (Optional) (DRY CON.) ....................................................... 34
4.9 Ethernet Port (ETH.) ......................................................................................................... 38
4.10 ISO 22734 Requirements .................................................................................................. 38
4.11 Initial operation of the electrolyser................................................................................... 38
5.Operation of the Electrolyser ............................................................................................ 42
5.1 Manual Start/Stop............................................................................................................ 42
5.2 Remote Start/Stop............................................................................................................ 42
5.3 Maintenance Mode.......................................................................................................... 42
5.4 Set Production Rate.......................................................................................................... 42
5.5 Ramp Up .......................................................................................................................... 43
5.6 Ramp Down...................................................................................................................... 43
5.7 Blowdown Routine ........................................................................................................... 44
5.8 Anti-Freezing Routine....................................................................................................... 44
5.9 Safety Heartbeat .............................................................................................................. 44
5.10 Troubleshooting............................................................................................................... 44
6.Enapter Monitoring Tools ................................................................................................. 46
6.1 Mobile Application ........................................................................................................... 46
7.Maintenance of the Electrolyser........................................................................................ 47
7.1 Updates ........................................................................................................................... 47
7.2 Routine Maintenance....................................................................................................... 47
7.3 Cleaning........................................................................................................................... 48
7.4 Disposal ........................................................................................................................... 48
7.5 Transport ......................................................................................................................... 48
8.Appendix .......................................................................................................................... 50
Appendix I. Hydrogen Leak Testing.................................................................................................................... 50
Appendix II. Preparing the electrolyte solution................................................................................................. 50
Appendix III. Draining the electrolyte ................................................................................................................ 52
Appendix IV. LED States...................................................................................................................................... 53
Appendix V. Error Codes..................................................................................................................................... 54

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1. 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.
1.1 SPECIFICATIONS
The specifications of the electrolyser can be found in the datasheet. It can be downloaded here:
Datasheet of the electrolyser. See the battery limits for more detailed information about the interfaces
and connections of the device: Battery limits of the electrolyser.
Versions
Air Cooled:
Liquid Cooled:
AC-version:
DC-version:

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EL4.0
Nominal Hydrogen Production
0.3 Nm3/h –0.5 Nm3/h
1.0785 kg/24 h
Output Pressure
Up to 35 barg
Hydrogen Output Purity
35bar: ~99.9 % (H2O: 1000-1500 ppm)
8bar: > 9000 ppm H2O
Water Consumption
0.42 l/h
Water Input Conductivity
< 20 µS/cm (at 25 °C), <5 µS/cm (at 25 °C) recommended
Water Input Pressure Range
1 –4 barg
Process Liquid
1 % KOH solution
Device to be filled with 1.54 % KOH
Operative Power Consumption
2.4 kW (max. 3.1 kW)
Peak Power Consumption
3.1 kW
Nominal Power Consumption
per Nm3of H2produced
4.8 kWh/Nm3(beginning of life)
Stand-by Power Consumption
15 W
Power Supply
220 V –230 V (AC), 50/60 Hz
48 V –60 V (DC)
Maximum Heat Dissipation
1.3 kW
Circuit Breaker
C13
Dimensions (W x H x D)
482 mm x 266 mm x 635 mm
Space inside cabinet
6 U
Weight
42 kg (empty) 1
41 kg (empty) 2
Control System Included
EMS
Communications
Wi-Fi
- 802.11a/b/g/n (2.4 GHz only)
- 802.12 WEP, WPA, WPA2 Personal (Pre-shared key)
- Wi-Fi client isolation must be disabled
Bluetooth
Modbus TCP via Ethernet
Remote Control
Enapter Cloud Service, Enapter App, Modbus TCP, Safety chain
(dry contact)
Safety
Maximum H2contained within
20 NL
Conformity
Machinery Directive and relevant harmonised standards:
2006/42/CE; ISO 12100
Low Voltage Directive and relevant harmonised standards: LVD
2014/35/UE; EN IEC 61010-1
EMC directive and harmonized standards: EMC 2014/30/UE;
IEC 61326-1
Radio equipment directive and harmonized standards: RED
2014/54/UE; EN 300 328

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Restriction of hazardous substances directive RoHS II
2011/65/EU, delegate directive UE 2015/863 and directive
2017/2102
Noise level at 1 m
<85 dB
Ventilation and Safety
Recommendation
To be installed in a safe (non hazardous) area only.
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 90% humidity, non-condensing 1
5 °C to 50 °C, up to 90 % humidity, non-condensing 2
Storage Conditions
2 °C to 55 °C, up to 90 % humidity, non-condensing
IP Rating
IP 20
Interfaces
H2Outlet
¼” bspp female port
O2Vent Outlet
⅜” bspp female port
H2Vent Outlet
¼” bspp female port
H2O Inlet
10 mm push-fit female bulkhead connector
Fill / Drain Port
10 mm CPC quick connector
Cooling Water Inlet 2
10 mm push-fit female bulkhead connector
Cooling Water Outlet 2
10 mm push-fit female bulkhead connector
1Air Cooled electrolysers only (Liquid cooled versions excluded)
2Liquid Cooled electrolysers only (Air cooled versions excluded)

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1.2FRONT PANEL & BOTTOM
EL4.0 AC air cooled front side
EL4.0 DC liquid cooled front side
EL4.0 air cooled bottom view
The front panel includes most of the physical connections of the device. The leakage drain hole is
positioned on the bottom of the device. For more information please refer to the battery limits.
1. H2O IN –please refer to the section Water Inlet Connection Guide (H2O IN)
Push-fit female bulkhead connector (10 mm outer diameter pipes) LLDPE
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 Oxygen Vent Connection Guide (O2 VENT)
⅜" bspp female port

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Output: O2with water vapour (H2O) and traces of H2
3. COOLING WATER IN/OUT –(only liquid cooled electrolysers) please refer to the Cooling Loop
Connection Guide (COOLING WATER IN/OUT)
Push-fit female bulkhead connector (10mm outer diameter pipes) LLDPE
Input/Output: cooling water to cool down the device
4. H2OUT –please refer to the Hydrogen Outlet Connection Guide (H2 OUT)
¼" bspp female port
Output: 0.5 Nm³/h of H2, up to 35 barg, 99,9% purity
5. H2 VENT –please refer to the Hydrogen Vent Connection Guide (H2 VENT)
¼" bspp female port
Output: Periodical vent of up to 20 NL (H2and water) every 12 hours
6. FILL / DRAIN
10 mm CPC quick connector
During maintenance routine for filling the electrolyte into the device or for draining
and preparing it for transport.
7. START STOP –please refer to the Manual Start/Stop section below
Manual start and stop button to start and stop the device
8. POWER –please refer to the Electrical Connection Guide (POWER)Electrical Connection Guide
(POWER)
Manual power button to switch device on and off
9. ETH. –please refer to the Ethernet Port (ETH.) section below
Interface to access external Modbus control features of the electrolyser. Find more in
the chapter below.
10. DRY CON. –please refer to the Dry Contact Connection Guide (Optional) (DRY CON.)
Interface to connect device to external sensors for emergency stops
11. WiFi Button –please refer to the Pairing the device to the cloud section below
Manual button to activate/deactivate WiFi
12. 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!
13. On/Off Button (only in AC version) or Breaker (only in DC version) –please refer to the Electrical
Connection Guide (POWER)Electrical Connection Guide (POWER)
Integrated magnetothermal circuit breaker to protect the electrolyser from
overcurrent and short-circuits.
14. Fuses (only in AC version) or Breaker (only in DC version) –please refer to the Electrical
Connection Guide (POWER)Electrical Connection Guide (POWER)
Integrated magnetothermal circuit breaker to protect the electrolyser from
overcurrent and short-circuits.
15. Handle Bars –please refer to the Transport section below
For easier transportation

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16. Air Inlets –please refer to the Routine Maintenance
Keep the air inlets free from dust and dirt
17. LEDs –please refer to the LED StatesAppendix IV
Status LEDs to show device status
18. Leakage Drain Hole –please refer to the Troubleshooting section below
The leakage drain hole allows the operator to drain the tray in case of a electrolyte or
water leakage.

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1.3BACK PANEL
EL4.0 air cooled back side
EL4.0 liquid cooled back side
The back panel of the device is used to blow out warm air. The stickers show the device specifications
and serial number details. Please leave at least 30 cm space behind the module to allow for adequate
airflow. Never obstruct the ventilation openings!

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2. SAFETY INSTRUCTIONS
2.1 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 injuries or death
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

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2.2 GENERAL SAFETY
Serious injuries and death as well as damages to the product or the environment
possible! Follow the instructions in this manual carefully!
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 piping (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 all relevant local safety guidelines, rules, directives and regulations.
4. The operator must check the device for hydrogen, water and KOH leakages regularly and ensure
that all interfaces are connected correctly.
5. It is the operator’s responsibility to regularly check and maintain all outlet lines, as well as to keep
the pipes free of ice, other obstructions or overpressure.
6. 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.
7. If larger hydrogen systems are created by putting together several modules, it is the operator’s
responsibility to ensure full compliance of the final assembly with all relevant local safety guidelines,
rules, directives and regulations.
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 and plug 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 earthing surfaces.
5. Never expose the device to rain or 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:
Wear protective goggles and nitrile gloves when handling the electrolyte solution.
Wear ear muffs or plugs in noisy areas.
Wear gloves when handling the device.

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Wear appropriate footwear when handling the device.
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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2.3 ADDITIONAL SAFETY FOR THE ELECTROLYSER
This device contains a SIL1 Safety Instrumented System (SIS) within, managing inner safety
instrumented functions (SIF). The SIS is accompanied by a Safety Manual, an addendum to the Owner’s
Manual, to be used in conjunction with it. It provides all the functional safety-relevant information,
necessary to the operator to verify the required skills and instructions to install, verify, maintain, and
periodically test the system, ensuring the respect of product safety requirements (item function,
input/output interfaces etc).
Ignoring the Safety Manual instructions could impair the safety functions performances.
In addition, 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 H2vent line and the O2vent line are never obstructed and never combined.
5. Do not combine the O2vent line of the EL4.0 with the O2vent line or other pipes of older models.

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3. 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 all relevant
local safety guidelines, rules, directives and regulations. 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.
3.1 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.
Caution! Hydrogen is highly explosive and volatile gas!
Hydrogen can explode! Do not mix hydrogen with oxygen or air! Prevent hydrogen from
leaking! Even small leakages will create flammable and explosive environments!
Prevent electrostatic charging of the device. Hydrogen ignites very easily!
Do not inhale hydrogen!
Hydrogen can cause asphyxiation!
Hydrogen is very volatile. Still it can accumulate in areas and materials that are
unexpected. Do not handle hydrogen without a suitable ventilation and safety system!
Incorporate the device, especially the hydrogen and the vent lines, into the operational
safety concept and comply with all relevant local safety guidelines, rules, directives and
regulations.
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.
The hydrogen which comes out of the device is under pressure! Comply with all relevant
local safety guidelines, rules, directives and regulations for the handling of compressed
hydrogen.
In the case of escaping gas, stay away and keep inflammable materials away.
Ensure proper installation of the supply pipes.
Check the hydrogen lines and connectors regularly for leakages.
3.2 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.

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A general training with regards to lifting heavy loads and general safety briefings are required to
perform the tasks safely described in this manual.
Operators must comply with the general safety principles during the handling phases. In particular:
Caution! The device is heavy!
Before handling, moving, and commissioning the device –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.
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 the 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.
3.3 ELECTRICAL HAZARDS
The device poses no special electrical hazards, if the following instructions on safety measures are
followed and the Electrical Connection Guide below is applied correctly:
Caution! The device requires an electrical power supply!
Handle the electrical installation with care. Ensure that the power plug is fastened
correctly into the socket to avoid any loosening of the wiring.
The power plug is not double insulated. Therefore it could become hazardous in
single fault condition. Make sure to disconnect the upstream power source before
touching the power plug.
Use only the supply voltage specified for 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 being
electrostatically discharged when mounting/dismounting the antenna.

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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.
3.4 CHEMICAL HAZARDS
Potassium Hydroxyde is used in the electrolyser as the main process liquid (electrolyte). The electrolyte
usually comes pre-mixed with the electrolyser but it can also be purchased as a powder to be diluted
in purified water.
Warning! The device contains chemicals!
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 the chemicals and potential hazards.
Attention!
Wear appropriate Personal Protective Equipment (PPE). Avoid 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 the 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.

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3.5 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)