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

7
Brief Introduction of the Product Structure
Internal Wiring Diagram
Picture 5
Picture 6

8
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

10
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

11
Operating the Unit
Rotate the knob according to the marking scale on the knob to increase or
decrease the temperature setting.
The green “Power” LED and red “Heating” LED will remain ON as long as the
power is generated to the system. The red LED will turns off when the water
temperature reaches the user setting, at the end of the heating phase.
The water heater needs to be turn on for a certain period of time to reach the
acceptable temperature.
During the heating process, it is normal if there is a slight drip at the safety valve.
Please do not cover the safety valve of the outlet hole.
Connect this outlet hole to a discharge pipe. Water may drip from the discharge
pipe of the safety valve; therefore this pipe must be exposed to the atmosphere
(air).
The safety valve has to be operated regularly (preferably at least every six
months) to remove limestone deposit and to ensure that the safety valve is not
blocked.
Introduction to Product Function
Heating function: the heating temperature can be set within 30oC to 75oC.
Safety function: use anti-dry protection for overheat protection to keep saving of
the unit when using.

Product Features
Super Tank, Single Weld Line with Titanium Porcelain Enamel coating which is
rut-proof, erosion-proof and with higher efficiency and having a longer life span.
Energy saving with minimum heat loss. The water temperature is able to be
maintained up to 48 hours after the electricity is switched off.
Rate power heating: 250W/350W.
Picture 12

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Warning: Do cut off the power supply before maintenance, to avoid danger
such as electric shock.
Check the power plug and the power socket as often as possible. Secure
electrical contact and also proper grounding must be provided. The power
plug and the power socket must not heat excessively.
If the heater is not used for a long time, especially in the area with low air
temperature (below 0oC), it is necessary to drain the water from the heater to
prevent damage of the water heater, due to frozen water in the internal
tank.(Refer to the “Cautions” chapter in this manual book for the method of
draining away the water from the inner container).
To make the water heater operation durable, it is recommended to regularly
clean the internal tank and remove deposits on the electric heating element of
the water heater, as well as check the condition of the magnesium anode
(whether fully decomposed or not) and, if necessary, replace it with a new
one in case of full decomposition. Tank cleaning frequency depends on the
hardness of the water in each location where this water heater is applied.
Cleaning must be performed by MODENA or special maintenance services.
The water heater is equipped with a thermal switch, which cuts off power
supply of the heating element upon overheating water or the absence of water
in the water heater. If the water heater is connected to the power supply, but
the water is not heated and the indicator does not light up, then the thermal
switch was switched off or not switched on. To reset the water heater to the
operating condition, it is necessary to:
1. De-energize the water heater; remove the plate of the front cover
(upside).
2. Press the button that is located at the center of the thermal switch (see
Picture 13);
3. If the button is not pressed and there is no clicking, then you should
wait until the thermal switch cools down to the initial temperature.
Part 5: Maintenance
Picture 13

13
Warning: Non-professionals are not allowed to disassemble the thermal switch to do
the reset. Please contact professionals of MODENA to maintain this electric storage
water heater. Otherwise, MODENA will not take responsibility of any accidents.
Tank Cleaning
After having been used in a long time, the storage (tank) of this water heater will
have the dirt in it and therefore must be cleaned:
Turn off the power source.
Close the cold water tap.
Open the hot water tap.
Open the pressure relief valve (if it is used).
Flush / rinse with cold water tanks.
Repeat this process several times until the tank is completely clean.
Safety Valve Cleaning
Safety valves should be cleaned regularly to prevent any dirt that clogs the valve:
Remove the safety valve, then clean and wash it.
Check if the parts of the valve are still able to move well.
After cleaning, replace the safety valve in its place by giving the
seal tape.
Fill the water heater with water after pipes refitted.
Magnesium Anode
Magnesium Anodes serves to neutralize corrosive substances in the water and will
run out in a certain time depending on the corrosive properties of the water. If the
water has good enough quality (PAM), Magnesium Anodes should be replaced
within 2 (two) years. If the water quality is not good, Magnesium Anodes should be
replaced in maximum 1 (one) year period of time. To replace Magnesium Anodes,
contact MODENA Call Center.
Heating Element
If the water contains limestone (Mud), the heating element cannot function properly
(slow heat) because it was covered by a crust of limestone (mud). Therefore, heating
element must be cleaned off from the sediment each year. To do this cleaning
procedure, contact MODENA Call Center.
Check the things below before contacting MODENA Service Center in the event of
interruption of operation:
Part 6: Troubleshooting

14
Problem
Possible Cause
Recommended Action
Heating indicator
Light is Off
Failures of the temperature
controller
Contact MODENA Call
Center for repairs
Power Indicator light
is Off.
1. Power source is not
connected or badly connected
2. Indicator light is damaged
3. Overheating sensor is
activated
Contact MODENA Call
Center for repairs
No water come out
from the hot water
outlet
1. Running water supply is cut
off
2. Hydraulic pressure is too low
3. The inlet valve of running
water is not open
1. Wait for the restoration of
the running water supply
2. Use the heater again when
the hydraulic pressure is
increased
3. Open the inlet valve of
running water
Water temperature
is not warm enough
1. Heating element is
deactivated
2. Temperature controller is
malfunction
3. No power to water heater
1. Replace the heating
element and call MODENA
Service Center for repairs
2. Contact MODENA Call
Center for repairs
3. Check the power supply
Water temperature
too high
Failures of the temperature
control system
Contact MODENA Call
Center for repairs
Water leak
1. Seal problem of the joint
(connection) of each pipe
2. Leaking from the plumbing
connection
3. Leaking in the gasket
1. Seal up the joints
2. Tighten the connection
3. Tighten the element or
replace the gasket and call
MODENA Service Center
for repairs
This symbol on the product, or on its packaging, indicates that this
product may not be treated as household waste. Instead, it should be
taken to the appropriate waste collection point for the recycling of
electrical and electronic equipment. By ensuring this product is
disposed correctly, you will help preventing the potential of negative
consequences for the environment and human health, which could
otherwise be caused by the inappropriate waste handling of this
product. For more detailed information about the recycling of this
product, please contact your local council or your household waste
disposal service.
Part 7: Disposal of Used Product

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Part 8: Specifications
Pa8: Specifications
Model
ES 15A3
ES 10A3
Type
Storage (Tank)
Installation
Vertical
Heat Souce
Electric
Heating Tank Material
Stainless Steel
Heating Tank Coating
Titanium Porcelain Enamel
Electric Safety (ELCB)
Yes
Overpressure Safety
Yes
Thermostat
Double
Grounding Terminal
Yes
Anti-rust
Magnihealth+
Capacity
15 L
10 L
Power
350 W
250 W
Water Pressure
0.015-0.8 MPa
Water Pipe Diameter
0.5 Inch
Temperature
Max 75oC
Insulation Material
PUF (Polyurethane)
Product Dimension
389 x 389 x 301 mm
349 x 349 x 276 mm
Product Weight
8.6 kg
7.1 kg
Specifications of this appliance may change without notice to improve the quality of the product. Figures in this
manual are schematic and may not match your product exactly. Values stated on the machine labels or in the
documentation accompanying it are obtained in laboratory in accordance with the relevant standards. Depending
on operational and environmental conditions of the appliance, values may vary.
Part 8 : Specification

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