Enapter WT 2.1 User manual

Version
Document Title
Release Date
01
WT 2.1 –Owner’s Manual
2021-03-12
1
WT 2.1
Water supply system for ELs
Owner’s Manual
Rev. 01 –March 2021

Version
Document Title
Release Date
01
WT 2.1 –Owner’s Manual
2021-03-12
1
PREFACE
Thank you for choosing an Enapter water supply system. Please study this manual carefully before
attempting to operate the device.
If you have any further questions on installing the device, please contact the Enapter support team.
Quote the system serial number when contacting us; you can find the serial number on the module's
back.
Enapter Srl
Headquarters: Via Lavoria 56/G
56040 Crespina (PI) –Italy
T.: [phone]
Website: www.enapter.com
Mail: [email protected]om
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 WT 2.1 safely and as intended.
Keep this manual in a safe place and readily available. Always follow its instructions. The operator's
responsibility is to ensure that an installed water tank system is always in proper condition. Please
observe any additional local requirements applicable to the installation and operation of the water
supply system. This owner's manual is intended as a general document and covers installation,
maintenance, and operation of the device.
Approved use
The WT 2.1 water supply system is designed to store water at low conductivity to provide the best
quality of pressurized water to the Enapter Electrolysers.
According to the specifications and instructions provided in this manual, the unit must only operate
for this purpose.
Observance of this manual is part of "normal use."
Danger of injury due to improper use!
Improper use of the product can result in serious injuries.
•Ensure that the manual is always accessible
•Make sure you have read and understood this manual in its entirety
•Comply with all safety instructions and warnings
•Store the manual and other documentation in a safe place and pass
them on to future owners of the product
•Comply with all local regulation

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Table of Contents
Preface ___________________________________________________________________1
Product Overview ___________________________________________________________3
Technical Specifications __________________________________________________________ 5
Safety instructions ______________________________________________________________ 6
List of Hazards _________________________________________________________________ 8
Installation _______________________________________________________________10
Tools, material, and accessories required ________________________________________________10
Unpacking _________________________________________________________________________11
WT 2.1 Connection Guide _______________________________________________________ 12
Overfilling Connection Guide __________________________________________________________13
Water Outlet Connection Guide ________________________________________________________13
Water Inlet Connection Guide__________________________________________________________14
Electrical Connection Guide ___________________________________________________________15
Water Tank Monitoring Tools ________________________________________________17
Commissioning of the WT 2.1 ________________________________________________18
Preparing for H2O flowing _______________________________________________________ 18
Pairing the Water Tank to the cloud _____________________________________________________18
Refilling____________________________________________________________________________18
WT 2.1 Working Principle ___________________________________________________19
Control, Functions, and System States _________________________________________21
Manual Start/Stop ___________________________________________________________________21
Transport, Maintenance, and Recycling ________________________________________22
Routine Maintenance ________________________________________________________________22
Disposal ___________________________________________________________________________22
Transport __________________________________________________________________________22
Appendix_________________________________________________________________23
Appendix I. Draining the WT 2.1 __________________________________________________________23
Appendix II. Cleaning the conductivity sensor _______________________________________________24
Appendix III. Depressurize the line ________________________________________________________25
Appendix IV. Manual refilling of WT 2.1 ____________________________________________________26
Appendix V. Integration in Cabinets _______________________________________________________27
Cabinet ____________________________________________________________________________27
Appendix VI. LED States _________________________________________________________________28
Appendix VII. Error codes________________________________________________________________29

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PRODUCT OVERVIEW
Enapter's Water Tank 2.1 (WT21) is a standardized, stackable, and flexible system to provide deionized
water to the electrolysers. The modular, easily maintainable design –paired with advanced software
integration –allows to set up the system in minutes, including remote control and management. To
have a water input at the right level of purification always available for your electrolysers, simply stack
this module inside standard 19" racks or any housing you wish.
Front Panel
Figure 1
The front panel of the WT 2.1 (Figure 1) includes all physical connections of the device –allowing easy
access for installers and maintenance staff, requiring access from only one direction, and simple
integration into standard 19" racks and cabinets.
1) H2O In
1. Bulkhead connector (10mm)
2. Requirements: Water input conductivity <20 µS/cm, input pressure = 0 → 6 bar
2) H2O Out
1. Bulkhead connector (8mm)
2. Output: max 3.8 L/min, up to 2.75bar
3) Overfilling
1. Bulkhead connector (10mm)
2
8
1
3
6
5
4
7
11.1
11.2
11.4
11.3
9
10

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2. Requirements: This port must never be obstructed
3. Output: In case of overfilling of the water tank, the water will exit through this port. It is
possible to use this port to equalize the tank's pressure during draining, filling, and supplying
water.
4) Depressurisation Port labelled "DEPR."
1. CPC quick connector 10 mm
2. It is only used during routine maintenance to depressurize the water outlet line and prepare
the piping to be disconnected. (Please, follow Appendix III)
5) Drain
1. CPC quick connector 10 mm
2. Only used during routine maintenance to drain the WT 2.1 and to prepare the device for
transport. (Please, follow Appendix I)
6) Maintenance Port labelled "MAINT."
1. CPC quick connector 10 mm
2. If needed by the machine to rinse and reset the conductivity sensor, please use this port if
bad water is detected. For detailed instructions of this procedure, please see Appendix II
below.
3. It can also depressurize the water inlet line and to prepare the piping to be disconnected.
7) On/Off Switch
8) Power –please refer to the Electrical Connection Guide below
9) ANT. –Antenna
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!
10) LEDs: for LEDs Status, please refer to Appendix VI below
11) Fuses
a. AC side - PHASE line
b. AC side –NEUTRAL line
c. DC side –Solenoid valve
d. DC side –Pump

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TECHNICAL SPECIFICATIONS
WT 2.1
Nominal water flow out
3.8 L/h
Delivery Pressure
Up to 2.75 Barg1
Nominal Power Consumption
35W
Water output Purity
<= 20μS/cm
Input Water Requirements
Pressure ≤6 BarG
Dimensions
L:483mm H:310mm W:640mm
Weight (without water)
23 kg
Weight (with water)
62 kg
Control System Included
Energy Management System (EMS)
Communications
Wireless (Wi-Fi)
Remote Shutdown
Enapter Cloud Service, Enapter App
Safety
Conformity
CE certified according to the machine directive 2006/42/CE
EN ISO 12100
ISO 13849
EN 61010
EN 61000-6-3
EN 61000-6-2
Noise at 1 m
<60 dB
Environmental
IP Rating
20
Operating Conditions
5°C to 45°C, up to 95% humidity, non-condensing
Interfaces
H2O Outlet
8mm Tube Fitting
H2O Inlet
10 mm Tube Fitting
Overfilling
10 mm Tube Fitting
Drain port
CPC quick connector 10 mm
Depressurize
CPC quick connector 10 mm
Maintenance
CPC quick connector 10 mm
1
Internal demand pump: pressure switch setting at 2.75 barg.

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SAFETY INSTRUCTIONS
Warnings and Hazards
The following terms and symbols are used in this manual to indicate essential text passages which
must be given particular attention:
warning regarding fatal/serious injury
warning regarding injury
warning regarding physical damage to the product
Do not open or disassemble
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
General safety
Any user, installer, and the operator must be aware of the following:
1. Do not use this machine in a potentially explosive area
2. We decline any responsibility resulting from improper use of the WT 2.1
a. Caused by the utilization of low water quality
b. Caused by supplying too high water inlet pressure
c. Caused by improper installation of the machine
d. Caused by leaking connections on the front panel of the device (Improper mounting
of tubing)
3. It is the installer's/user's or owner's responsibility to check and maintain the overfilling line
regularly and keep it free of ice or obstructions.
User should always observe the following rules:
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. Do not use the device near flammable
substances.
3. Handle the power supply cable with care. Do not pull the electric line 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.

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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. Always disconnect the machine from electricity before any maintenance and transport.
9. Only use the machine in the way and for the purposes mentioned in this manual. If the device
is utilized for uses other than specified in this manual, unforeseen hazards may present.
10. Use the handles when lifting and moving the device.
11. Never attempt to repair the machine by yourself. The device must be repaired only by
qualified staff who use original spare parts; otherwise, risks may arise for the operator.
12. Do not store the unit at temperatures below 2°C.
13. All the water lines must be properly connected before to power the device ON.

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LIST OF HAZARDS
Any system-operator, integrator, end-user, technician who performs service, maintains, or install the
device must be aware of the potential risks of its use and implement sufficient processes in case of an
accident or emergency.
Always ensure that the system is installed and operated according to local code,
regulations, and standards. Do not install, use, or maintain the system without explicit
knowledge or help from experienced and licensed system integrators, manufacturers, or
external certifying bodies.
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 when
handling the device and packaging material.
While handling the packaging material and preliminary installation does not require specialized
technicians, general training regarding lifting heavy loads and general safety briefings is necessary to
perform these tasks safely.
Operators must comply with the general safety principles during the handling phases. In particular:
Caution!
Before handling, moving, and commissioning the system, assess the
operation's risks, 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 two people –plan around
this and allow ample space to move around.
Do not lift the device over our heads.
Caution!
During handling the device, be cautious and use the handles on the device to
minimize 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.
At least two people must handle the packaging/device.
Electrical hazards
Do not touch the antenna when the system is powered. 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:

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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 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. 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.
Other than cleaning and routine user maintenance, any servicing must be
performed by trained, Enapter-endorsed technicians.
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 staff.
•Operators and maintenance staff 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.
•Other than cleaning and user maintenance, specialist personnel must perform any servicing
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 intensity).
The WT 2.1 has not been designed for outdoor use. The User's responsibility is 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 V below.

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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 of installing,
commissioning, and running the WT 2.1.
Tools, material, and accessories required
The following tools and equipment are needed to set up the device successfully.
Tools
•Locking clips (10mm and 8 mm)
•Plastic pipe cutter
•Phillips head screwdriver
Materials
•8mm Ø LLDPE pipe
•10 mm Ø LLDPE pipe

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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. Afterward, 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 WT 2.1 out of the packaging alone. A WT 2.1 weighs 23 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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WT 2.1 CONNECTION GUIDE
The following part will outline the instructions for creating safe connections to and from the WT 2.1.
It will also include output management guides, safety-related instructions, and instructions for
connecting power to the device.
Always ensure that the system is installed and operated according to local code, regulations, and
standards. Do not install, work, or maintain the system without explicit knowledge or help from
experienced and licensed system integrators, manufacturers, or external certifying bodies.
Please remember always to check the correct connection of the Water Tank's water lines before
powering it ON.
If any further questions arise, please contact the appropriate Enapter service and support teams to
answer any questions about the water tank's installation and integration.
Water connection instructions
All the connections of the WT21 are plastic pipe: the interfaces are push-fit bulkheads, with a diameter
of 10 mm (Water in/overfilling) and 8 mm (water out). The lines to be connected using these
instructions are labelled "H2O OUT", "H2O IN",and "OVERFILLING" on the front panel of the machine.
Follow the below instructions carefully –please refer to the manufacturers technical support guide
for any further details: DM Fit Technical Support
2
.
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 for the water outlet, water inlet, and overfilling.
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 you are managing 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.
2
http://www.dmfit.com/fitting_catalog.pdf

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Overfilling Connection Guide
Following the steps outlined in the water connection instructions above, connect the "Overfilling"
port, located at the bottom left of the front panel, to a place where deionized water can be drained
in case of overfilling.
Warning!
Do not insert obstructions into the Overfilling line. It can cause damage to
your water supply system. Ensure that the water can drain out of the line
safely.
Attention!
Enapter is not responsible for any damage caused to the system from
mismanaged overfilling line arrangements.
To connect a device, create a connection using a 10 mm LDPE pipe to the port
labelled "Overfilling" using a 10mm stem elbow if needed. The line should run
vertically.
It is an OUTLET port. Water will flow out from this port only if both the analogic
level sensor and the high-level switch or the solenoid valve fail.
Please, be sure to connect this pipe to the User's drainage system.
Moreover, be sure that at any point, the pipe connected to this port does not
overcome the height of theline indicates the maximum level on the level indicator.
Water Outlet Connection Guide

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Following the steps outlined in the water connection instructions
above, connect the 8mm Ø LLDPE pipe to the "H2O OUT" port,
located at the top left of the front panel, directly to your
electrolysers. Use an 8mm stem elbow, if needed. From this port,
high-pressure water comes out.
Be sure to connect this port to the "H2O IN" port of the EL.
Water Inlet Connection Guide
Following the steps outlined in the water connection instructions above, connect
the 10mm Ø LLDPE pipe to the "H2O IN" port, located at the bottom left of the
front panel.
It is an inlet port. You must connect the source of water you want to store inside
the tank (this source must be deionized water with a conductivity
<20microSiemens/cm).

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Electrical Connection Guide
Attention!
Double-check all the wiring connections –before supplying power to the
device. Failure to adhere to the following instructions can damage the device
and lead to hazardous conditions around the machine!
Never handle the electrical connections with wet hands!
Before mounting the power input cable to the female connector, ensure the ferrite (included with
each WT) is in place around the cable as close as possible to the male connector (Figure 2). The ferrite
has an internal diameter of 13.77 mm (350 Ohm, 150 MHz) and can simply be slid over the cable.
Figure 2
Connect the WT 2.1 to the female electrical port labelled "Power." In the image above, brown is live,
blue is neutral, and yellow/green is the ground. Follow the relevant safety standards and ensure that
local rules and regulations are followed. The minimum cable cross-section diameter for each
connection is 0.5 mm2. Ensure to use the male connector in the correct orientation, as shown below.
Figure 3
L
(LIVE)
N
(NEUTRAL)

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The WT 2.1 has fuses that protect the device from overcurrent. However, we recommend installing a
protective device against overload and short circuits on the power supply line; this must be selected
according to the device's maximum power consumption and in compliance with all local and national
safety requirements. To increase the water supply system's electrical safety, we recommend installing
an SPD (Surge Protection Device) to protect the water tank from potential over-voltages generated by
lightning strikes.
The WT 2.1 must be connected to the ground to prevent users from contacting dangerous voltage and
allowing the device's correct functioning. The grounding system must comply with local and national
regulations.

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WATER TANK MONITORING TOOLS
The WT 2.1 can be monitored and controlled remotely by authorized users by logging into Enapter's
cloud services on a web browser (https://cloud.enapter.com/login
3
).
The WT 2.1 comes with a preinstalled UCM (Universal Communication Module), which provides the
immediate ability to monitor and manage the device. It does this by sending data to the Enapter Cloud,
which stores it in a time-series database and provides real-time or on-demand visualization of
collected data on customizable dashboards. To ensure the UCM is equipped with the latest protocols
and security fixes, over-the-air updates are also supported.
Every WT 2.1 can be directly integrated with the Enapter Software-Defined Energy Management
System (EMS). The UCM inside the machine connects either straight to Enapter Cloud or via an Enapter
Gateway, which readies your system for Industry 4.0 –to find out more, please visit
https://handbook.enapter.com/
4
.
Any user of Enapter products can now integrate a wide range of devices and analog inputs into the
hydrogen production environment. System data of integrated tools is read continuously and is then
securely transmitted to the cloud, accessed from anywhere in the world at
https://cloud.enapter.com/
5
or with Enapter's mobile application.
After the device setup is finished, the User can manage the WT 2.1 via the mobile or web dashboard,
which includes functionality to be controlled by the Enapter Rule Engine (requires an Enapter Gateway
on the site).
Mobile Application
Enapter's mobile application makes the installation of any energy system quick and easy. If any part
of your hydrogen system encounters an issue, the mobile app can send push notifications to the User
alerting them to the situation. This functionality is available via Wi-Fi or a 3G network all over the
world.
To find out more, please refer to the online Enapter Handbook
6
.
3
https://cloud.enapter.com/
4
https://handbook.enapter.com/
5
https://cloud.enapter.com/
6
https://handbook.enapter.com/mobile/mobile.html

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COMMISSIONING OF THE WT 2.1
PREPARING FOR H2OFLOWING
Now that the device is connected, here is what to do next to get the system running.
Pairing the Water Tank to the cloud
It is time to power on the device for the first time.
Using the Enapter app, add your device to a site. For detailed information on this, please refer to the
mobile application handbook
7
.
Step 1) To start using the application, you need an account in the Enapter Cloud. If you already have
an account, skip this step.
To create an account, click on the create account button on the first screen.
Step 2) After logging in on the Enapter app, create a site –a virtual environment that will house all
the telemetries collected from the devices in your system connected to the cloud via UCMs
(Universal Communication Modules).
Step 3) Add the WT 2.1 to the site by scanning the QR code located on the system's front panel.
Refilling
Make sure to connect the device to a water purification system, or any other source of deionized
water, through the port "H2O IN" and make sure the outlet of the WT "H2O OUT" is also connected to
the electrolyser(s).
Your system is now ready to be commissioned for its first use.
Step 1) Switch on the machine: the tank will start filling immediately. If this does not
occur, ensure the overfilling line is not obstructed.
Step 2) When the tank's water level is high enough to start the pump, it will start
working.
Step 3) The WT21 will automatically stop the refilling when the water level rises to
the maximum.
After the start, the refilling must finish in 180 minutes; otherwise, the device will go into error mode.
If you have any questions about the safety, installation, and control of the WT 2.1, please refer to the
Enapter Handbook
8
or contact Enapter support online via the cloud or by email or telephone.
7
https://handbook.enapter.com/mobile/mobile.html
8
https://handbook.enapter.com/electrolyser/wt21/wt21.html

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WT 2.1 WORKING PRINCIPLE
The tank has a conductivity sensor to measure the water quality in the inlet of the tank. If it is not
within limits required by Enapter systems, which is <20 µS/cm, the entry of water into the tank is
blocked until the sensor detects water with low conductivity again. At any rate, for a very short initial
time of the refilling, values up to 30 µS/cm are accepted to give time to the deionized water's source
to purify within the required values. In case of a warning, follow Appendix II to restore correct
functionality.
Thanks to a self-priming pump, the stored water is pumped towards the electrolysers: a check valve
is installed downstream of the pump to avoid backflow towards the water tank.
The pump has a pressure switch integrated, which controls the exiting fluid pressure (from port H2O
OUT): when the threshold (2.75 bar) is reached - when the User requires no water, the pressure
switch turns off the pump. The pressure value gained on the WT21 outlet pipe can be greater than
2.75 barg based on the water tank-electrolyser system's pressure drops.
When the pressure decreases lower than the threshold, the pump turns on again.
Three water levels will be monitored in the tank ("low", "medium", and "maximum") through a level
transmitter: the solenoid valve (N/C) closes when the maximum filling level is reached and opens
when the medium level is reached. During the first WT refilling, the water level is lower than the
minimum level, and the solenoid valve guarantees the water flows inside the tank.
The pump is powered only when the water level reaches the medium level, and it is powered OFF if
the tank empties up to the minimum level.
Suppose the power supply to the WT fails while the level has not reached the medium. In that case,
the pump will start working after restarting the system.
In normal operating conditions, the solenoid valve will allow the tank to be filled up to the maximum
level.
Suppose the power supply to the WT fails while the level has not reached the maximum. In that case,
the inlet valve will remain closed unless the medium level is not overtaken again after restarting the
system.
The 3 LEDs located next to the right handle on the front panel help indicate the
system status and operating condition. For more information on machine status and
operation conditions, the cloud services and Enapter app detail the specific device
states and error/warning messages. Please see the Handbook
9
.
For the Error Codes list and description, please visit the Handbook
10
.
9
https://handbook.enapter.com/electrolyser/wt21/wt21.html
10
https://handbook.enapter.com/electrolyser/wt21/wt21.html#warning-error-and-fatal-error-codes