Modena Unica Series Owner's manual

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

2
TABLE OF CONTENT
Part 1: Important Safety Information 3
General Remark 3
Caution 3
Special Caution 3
Part 2: Product Introduction 6
Nomenclature 6
Technical Performance Parameters 6
Brief Introduction of the Product Structure 7
Product Features 7
Part 3: Installation 7
Installation Instruction 7
Plumbing Connection 9
Part 4: How to Use 11
Operating Procedure 11
Operating the Water Heater 12
Product Function Introduction 12
Part 5: Maintenance 13
Tank Cleaning 13
Safety Valve Cleaning 13
Magnesium Anode 15
Heating Element 15
Part 6: Troubleshooting 15
Part 7: Disposal of Used Product 16
Part 8: Specification 17
Appendix: Wiring Diagram 18
This manual book explains everything you need to know about your
new product. Please contact our Customer Care should you need
further assistance through www.modena.com.

3
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 in 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.
Caution
Before installing this electric storage water heater, check and ensure
that the power socket is properly functional and reliably grounded.
Otherwise, this electric storage water heater cannot be installed and
used yet. Do not use an extension cord if there is a problem with the
power socket. Incorrect installation and use of this electric water
heater may result in serious injuries and loss of property.
Special Caution
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 power socket must be grounded (earthed) reliably. The rated
current of the power socket should not be lower than 16A. The
socket and plug shall be kept dry to prevent electrical leakage.
The installation height of the power socket shall not be lower than
1.8 m.
The wall in which the water heater is installed should 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.
PART 1: IMPORTANT SAFETY INFORMATION

4
The pressure relief valve attached with the water heater must be
installed at the cold water inlet of the appliance (Picture 1), and
ensure it is not exposed in the foggy. The water may be flowed out
from the pressure relief valve, so the outflow pipe must be opened
wide towards the air. The pressure relief valve needs to be
checked and cleaned regularly to avoid blockage.
When using the water heater for the first time (or for the first use
after maintenance), the water heater cannot be switched on until it
has been filled fully with water. When filling it with water, at least
one of the outlet valves of the water heater must be opened wide
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, and this is a normal case. If there is
an over-leaking, please contact MODENA Customer Care for
repair. This pressure relief hole should, under no circumstances, be
Picture 1
Machine Body
Hot Water Outlet Pipe
Nut for Hot Water Outlet
Water Inlet Mouth’s Copper Nut
Handle for Mixing Valve
Shower
Pressure Relief/Safety Valve
Cold Water Inlet Pipe
Pressure Relief Hole

5
blocked; otherwise, the water 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 tank can reach up to 75 oC,
the hot water must not be directly flowed to human skin at the
initial 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 water heater are damaged
please contact MODENA Customer Care for repair.
For the correct operation of the water heater, it is necessary to pay
attention that the maximum inlet water pressure is 0.8 MPa (0.8
Bar), and the minimum inlet water pressure is 0.015 MPa (0.15 Bar).
When the water pressure is over 0.8 MPa, the safety valve will
automatically active. The water may drip from the drainage 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/safety valve. Twist off the fixed screw nail
of the safety valve, and lift the handle for water drainage upwards
(Picture 3). A drainage pipe connected to the pressure relief device
has to be installed in a continuously downward direction and in a
frost-free environment.
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.

6
Nomenclature (The Terms to Classified Product Types
and Names)
ES XXA3 (e.g ES 10A3, ES 15A3)
ES = the product code of the water heater;
XX = the capacity of the water heater (L);
A3 = the series of the water heater;
Technical Performance Parameters
Rated Volume
10 L, 15 L
Rated Voltage
220 ⁓
Rated Power
10 L
250 W
15 L
350 W
Rated Pressure
0.8 MPa
Rated
Frequency
50Hz
Rated Water
Temperature
75 oC
Heating
Efficiency
>90%
Water-proof
Degree
IPX4
Structure
Mode
Hermetically
Closed Type
Water Storage
Style
Picture 2
Picture 3
PART 2: PRODUCT INTRODUCTION
Picture 4
Fixed
Screw Nail
Water Outlet
Safety Valve
Opened Water
Drainage Valve Position
Handle for Water
Drainage Valve

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Brief Introduction of the Product Structure
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.
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 water heater filled fully with water, it is
then necessary to install a special support. In case of the hollow
Picture 5
PART 3: INSTALLATION
Temperature Controller Knob
Machine Body
Power Indicator
Hot Water Outlet
Cold Water Inlet
Heating Indicator

8
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: On the wall that is strong enough, drill 2
holes with a diameter of 8 mm, and the distance between one hole
to another is 62 mm. The depth of the hole is approximately 45
mm. Use the anchor fastener bolts that are provided along with the
product for securing the bracket (Picture 6) 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 until it is
locked.
Install the power plug to the supply socket in the wall. The suitable
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 should not be less than 1.8 m (see
Picture 7). If there is a problem on the power cord, the cord should
be replaced by MODENA agencies, or qualified person to ensure
the safety.
Picture 6
Picture 7
E (Yellow/Green)
L (Brown)
N (Blue)
Ground
≥1.8 m

9
If the bathroom size is too small, the water heater can be installed
at another place. In one condition, the water heater should be
installed closely to the set-point of its usage to optimize the heat of
the water.
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 that are provided with the water heater must
be added at the end of the threads to ensure the connection is
leak-proof (see Picture 8).
Picture 8
Machine Body
Rubber Seal Gasket
Hot Water Outlet
Controller Handle for
Mixing Valve
Power Cord
Hot Water
Outlet Valve
Cold Water Inlet
Pressure Relief /Safety Valve
Pressure Relief Hole
Rubber Seal Gasket
Joint Screw for Cold Water Inlet

10
If the users want to utilize a multi-way supply system, refer to the
method shown in Picture 9 for the connection of the plumbing.
NOTE
Please be sure to use the accessories provided by MODENA to
install this electric storage water heater. This water heater cannot be
hung on the bracket that is not firm and reliable. Otherwise, this
water heater may drop off from the wall, resulting to its damage,
even serious accidents or injury to the user. When determining the
locations for the holes of the bolt, ensure that there is a clearance
not less than 0.2 m on the right side of this appliance, for the
convenient maintenance, if necessary.
Picture 9
Hot Water
Outlet Pipe
Triple Joint
Pipe
Valve for Water
Pipe
Shower
Pressure Relief/Safety Valve
Water Inlet
Valve
Basin / Water
pool
Pressure Relief Pipe
Machine Body
Water
Valve
Mix

11
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 appliance filled with water.
When the water flows out of the outlet pipe it implies that the water
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 to avoid the
damage on the heating element. During the normal operation, the
inlet valve should always be 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 should be off; and the reset
button should bounce up. Then, push down the reset button, and
the indicator light will turns on to verify that the leakage protection
works well (Picture 10). If the reset button cannot be pressed
during the use, 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.
If the indicator lights up, the thermostat will automatically control
the temperature. When the water temperature inside the heating
tank has reached the set point, it will switch off this water heater
automatically. When the water temperature falls below the set
point, the water heater will be turned on automatically to restore
the heating.
Picture 4
PART 4: HOW TO USE
Picture 10
Testing Button
Reset Button
Indicator Light
Power Plug

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Operating the Water Heater
Rotate the knob according to the marking scale on the knob to
increase or decrease the temperature.
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 set scale, at the
end of the heating phase.
The water heater needs to be turned on for a certain period of time
to reach the desired temperature.
During the heating process, it is normal if there is a bit of drip from
the safety valve. Please do not cover the safety valve of the water
outlet hole.
Connect this outlet hole to a drainage pipe; water may drip from
the drainage pipe of the safety valve; therefore this pipe must be
exposed towards 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.
Product Function Introduction
Heating function: the heating temperature can be set within 30 oC
to 75 oC.
Safety function: use anti-dry protection or overheat protection to
keep the water heater safe when using.
Picture 11

13
Check the power plug and the power socket as often as possible.
The power socket must be secured, and the proper grounding
must be provided. The power plug and the power socket must not
heat excessively.
If the water heater has not been used for a long time, especially in
the area with low air temperature (below 0 oC), it is necessary to
drain the water from the heating tank to prevent damage, due to
frozen water in the internal tank (refer to the “Important Safety
Information” part in this manual book for the method of draining
away the water from the inner tank).
To make the water heater durable, it is recommended to regularly
clean the internal tank and remove the deposits on its heating
element. 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.
The frequency of tank cleaning depends on the hardness of the
water in each location where this water heater is applied. Cleaning
must be performed by MODENA or authorized maintenance
services.
This water heater is equipped with a thermal switch, which cuts off
the power supply of the heating element upon overheating or the
absence of water in the tank. 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 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 12).
PART 5: MAINTENANCE
WARNING!
Do cut off the power supply before maintenance, to avoid danger
such as electric shock.

14
3. If the button is not pressed and there is no clicking, wait until
the thermal switch cools down to the default temperature.
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:
1. Turn off the power source.
2. Close the cold water valve.
3. Open the hot water valve.
4. Open the pressure relief valve (if it is used).
5. Flush / rinse the tank with cold water.
6. 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:
1. Remove the safety valve, then clean and wash it.
2. Check if the parts of the valve are still able to move properly.
3. After cleaning the valve, install the safety valve back to its position
by giving the seal tape around the end of valve.
4. Fill the water heater with water after pipes refitted.
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.
Picture 12
Manual Reset Button

15
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 Customer Care.
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, the heating element must be cleaned off
from the sediment each year. To do this cleaning procedure, contact
MODENA Customer Care.
Check the things below before contacting MODENA Customer Care in
the event of disturbance while using this water heater:
Problem
Possible Cause
Recommended Action
Heating indicator
light is Off.
Failures of the temperature
controller.
Contact MODENA Customer
Care for repair.
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 Customer
Care for repairs.
No water flows out of
the hot water outlet.
1. Running water supply is cut
off.
2. Hydraulic pressure is too
low.
3. The water inlet valve is
closed.
1. Wait for the restoration
of the running water
supply.
2. Use the appliance again
when the hydraulic
pressure is increased.
3. Open the water inlet
valve.
PART 6: TROUBLESHOOTING

16
Problem
Possible Cause
Recommended Action
Water temperature is
not warm enough.
1. Heating element is
deactivated.
2. Temperature controller is
malfunction.
3. No power/current running
to the water heater.
1. Replace the heating
element and contact
MODENA Customer
Care for repair.
2. Contact MODENA
Customer Care for
repair.
3. Check the power
supply.
Water temperature is
over high.
Failures of the temperature
control system.
Contact MODENA Customer
Care for repair.
Water leak
1. Seal problem on 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 pipe
connection.
3. Tighten the element or
replace the gasket and
contact MODENA
Customer Care for
repair.
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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Model
ES 15A3
ES 10A3
Type
Storage (Tank)
Installation
Vertical
Heat Source
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

18
Picture 13
APPENDIX: WIRING DIAGRAM
Electrical Leakage
Protection Wire
Thermal
Cut-out
Thermostat
“Power” LED
(Green)
Heating Element
Heating LED (Red)
L
N
E
Test
Indicator
Position-Resetting

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