Modena Unica Series Owner's manual

User Manual Book
(Electric Storage Water Heater)
Unica Series
ES 10 A3, ES 15 A3

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Thank you for your trust in choosing MODENA products for your household
needs. With your satisfaction as our priority, we constantly aim to deliver
stylishly designed products equipped with state-of-the-art technology to
assist you in your daily activities.
This is your guidebook containing everything you need to know about our
product. Please reach us if you need further assistance or other information
via our Customer Care or our official website www.MODENA.com.

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CONTENTS
PAGE.
•
Introduction
2
•
Part 1
: Important Safety Information
4
•
Part 2
: Product Introduction
6
•
Part 3
: Installation
8
•
Part 4
: How to Use
10
•
Part 5
: Maintenance
12
•
Part 6
: Troubleshooting
13
•
Part 7
: Disposal of Used Product
14
•
Part 8
: Specification
15

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General Remark
The installation and maintenance has to be done by qualified professionals or
authorized technicians of MODENA. MODENA is not responsible for any damage or
malfunction caused by wrong installation or the failure of following instructions that
are included in this manual book. For more information regarding to installation and
maintenance guidelines in details, please refer to below chapters.
Cautions
Before installing this electric storage water heater, check and ensure that the
(power) electrical socket is properly functional and reliably grounded. Otherwise, the
electrical storage water heater cannot be installed and used. Do not use an
extension cord if there is a problem with the power socket. Incorrect installation and
use of this electrical water heater may result in serious injuries and loss of property.
Special Cautions
Following warming sentences: If the supply cord is damaged, it must be replaced
by MODENA technicians, MODENA service agent or similarly qualified persons
in order to avoid a hazard.
The supply socket must be grounded (earthed) reliably. The rated current of the
power socket shall not be lower than 16A. The socket and plug shall be kept dry
to prevent electrical leakage.
The installation height of the supply socket shall not be lower than 1.8m.
The wall in which the electrical storage water heater is installed shall be able to
bear the twice bigger load than the weight of this water heater filled fully with
water without distortion and cracks. Otherwise, other strengthening measures
shall be adopted.
The pressure relief
valve attached with
the water heater
must be installed
at the cold water
inlet of this heater
(Picture 1), and
make sure it is not
exposed in the
foggy. The water
may be flowed out
from the pressure
relief valve, so the
outflow pipe must
open wide towards
the air; The
pressure relief
valve need to be
checked and
cleaned regularly,
Part 1: Important Safety Information
Picture 1

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so as to make sure it will not be blocked.
When using the water heater for the first time (or the first use after maintenance),
the water heater cannot be switched on until it has been filled fully with the water.
When filling it with the water, at least one of the outlet valves at the outlet of the
water heater must be opened to exhaust the air. This valve can be closed after
the water heater has been filled fully with water.
This water heater is not intended to be used by persons with special needs for
their physical, sensory or mental capabilities (including children), unless they
have been given the supervision or instructions concerning the use of the
appliance by a person who responsible for their safety. Children should be
supervised to ensure that they are not playing with this water heater
During the heating process, there may be drops of water dripping from the
pressure relief hole. This is a normal case. If there is an over-leaking, please
contact MODENA customer call center for repair. This pressure relief hole shall,
under no circumstances, be blocked; otherwise, the heater may be damaged,
even resulting on accidents.
The drainage pipe connected to the pressure relief hole must be kept sloping
downwards.
Since the water temperature inside the heater can reach up to 75oC, the hot
water must not be directly flowed to human bodies at the intial use. Adjust the
water temperature to a suitable temperature to avoid scalding.
If the flexible power supply cord is damaged, the special supply cord provided by
MODENA must be selected, and replaced by MODENA maintenance personnel
(technician).
If any parts and components of this electrical storage water heater are damaged
please contact customer care center for repair.
Caution: In order to avoid a hazard due to inadvertent resetting of the thermal
cut-out, this appliance must not be supplied through an external switching device,
such as a timer, or connected to a circuit that is regularly switched on and off by
the utility.
For the correct operation of the appliance, it is necessary to pay attention that the
maximum inlet water pressure is 0.8MPa (0.8Bar), and the minimum inlet water
pressure is 0.015MPa (0.15Bar).
When the water pressure is over 0.8MPa, this will be automatically activated the
safety valve, the water may drip from the discharge pipe of the pressure-relief
device (Picture 2). Therefore, this pipe must be left open towards the air
(atmosphere). The pressure-relief device should be operated/activated regularly
to remove limestone deposits and to ensure that the pipe is free from blockage;
Draining away the water inside the inner container can be done from the
pressure relief valve. Twist the thread screw of the pressure relief valve off, and
lift the drain handle upwards (Picture 3). A discharge pipe connected to the
pressure-relief device has to be installed in a continuously downward direction
and in a frost-free environment.

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Nomenclature (The Terms to Classified Product Types and Names).
ES 10A3, ES 15A3
ES = the product code of the electric storage water heater;
XX = the capacity of the water heater (L);
A3 = the series of the water heater;
Technical Performance Parameters
Part 2: Product Introduction
Picture 4
Picture 2
Picture 3

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Brief Introduction of the Product Structure
Internal Wiring Diagram
Picture 5
Picture 6

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Installation Instruction
This electric storage water heater shall be installed on a solid wall. If the strength
of the wall cannot bear the load equal to two times of the total weight of the
heater filled fully with water, it is then necessary to install a special support. In
case of the hollow bricks wall, ensure to fill it with concrete cement completely,
and use anchor fastener bolt in case of the hebel wall.
After selecting a proper location, install the mounting bracket to a solid wall.
The methods of installation ES XXA3: On the the wall that is strong enough, drill
2 holes with a diameter of 8 mm, and the distance between the hole with another
hole is 62 mm. The depth of the hole is approximately 45mm. Use the anchor
fastener bolts provided along with the product for securing the bracket (Picture 7)
firmly on the wall.
Align the slots on the back of the water heater with the projections on the bracket
and mount the water heater on the bracket untill it is locked.
Install the power plug to the supply socket in the wall. The power supply is 220V.
It is recommended to place the supply socket on the right above the water heater.
The height of the power socket to the ground shall not be less than 1.8m (see
Picture 8). If there is a problem on the power cord, the cord should be replaced
by MODENA, agencies or qualified person to ensure the safety.
If the bathroom size is too small, the water heater can be installed at another
place. In one condition, the water heater shall be installed closely to the stand-
point of its usage to optimize the heat of the water.
Part 3: Installation
Picture 7
Picture 8

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Plumbing Connection
The dimension of used pipe is G1/2 (”BSP ½”) ; The maximum and minimum
pressures of inlet should use Pa (Bar) as the unit.
Connect the pressure relief valve with the water heater on the inlet of the water
heater.
In order to avoid leakage when connecting the plumbing, the rubber seal gaskets
provided with the water heater must be added at the end of the threads to ensure
the connection is leak-proof (see Picture 9).
If the users want to utilize a multi-way supply system, refer to the method shown
in Picture 10 for the connection of the plumbing.
Picture 9
Picture 10

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Note:
Please be sure to use the accessories provided by MODENA to install this electric
storage water heater. This electric storage water heater cannot be hung on the
bracket until it has been confirmed to be firm and reliable. Otherwise, this water
heater may drop off from the wall, resulting to its damage, even serious accidents of
injury to the user. When determining the locations for the holes of the bolt, it shall be
ensured that there is a clearance not less than 0.2m on the right side of the electric
heater, for the convenient maintenance of this water heater, if necessary.
Operating Procedure
Check all the piping connection to avoid the leakage case before turning on this
electric storage water heater.
Open one of the outlet valves of the water heater, then, open the inlet valve to get
the water heater filled with water.
When the water flows out of the outlet pipe it implies that the heater has been
filled fully with water, and the outlet valve can be closed.
Make sure that the tank is fully filled up with water; otherwise it will cause the
heating elements to be damaged. Note: During the normal operation, the inlet
valve shall be always kept open.
Insert the power plug into the power socket and check the reliability of the
leakage protection device (ELCB). Press the testing button, the indicator light on
the plug shall be off, and the reset button shall bounce up; then push down the
reset button, the indicator light will turns on to verify that the leakage protection
works well (Picture 11). If the reset button cannot be pressed during the process
of using, the leakage protection device (ELCB) might be error or fails to work; If
the reset button is pressed down and bounce up again, then it shows the power
circuit leaks or the power supply is disconnected .
Part 4: How to Use
Picture 11