Modena Casella Series Owner's manual

User
Manual Book
Electric Storage Water Heater
Casella Series
ES 10D, ES 15D, ES 30D
ES 10DR, ES 15DR, ES 30DR
Snella Series
ES 20SR

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 of Product Structure 6
Part 3: Installation 8
Installation Instruction 8
Plumbing Connection 10
Part 4: How to Use 11
Operating Procedures 11
Operating the Water Heater 12
Part 5: Maintenance 33
Tank Cleaning 34
Safety Valve Cleaning 35
Magnesium Anode 35
Heating Element 35
Part 6: Troubleshooting 36
Part 7: Disposal of Used Product 37
Part 8: Specification 37
Appendix: Wiring Diagram 40
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 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
Caution
Before installing this electric storage water heater, check and ensure
that the power 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 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 earthed (grounded) reliably. The rated
current of the socket should not be lower than 16A. The power
socket and the power plug should be kept dry to prevent electrical
leakage.
The installation height of the power socket should not be lower
than 1.8 m.
The wall in which the electrical storage 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 should be adopted.
PART 1: IMPORTANT SAFETY INFORMATION

4
The pressure relief valve that is attached with the water heater
must be installed at the cold water inlet of this appliance (see
Picture 1), and make sure it is not exposed in the foggy. The water
may be out-flowed 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 this water heater for the first time (or for the first use
after maintenance), this heater cannot be switched on until it has
been filled fully with water. When filling the water, at least one of
the outlet valves 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 appliance (water heater) is not intended to be used by
persons with special needs for their physical, sensory or mental
capabilities, or lack of experience and knowledge (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 not, under any
circumstances, be blocked; otherwise, the water heater may be
damaged, even resulting on accidents.
Picture 1
Fixed Screw
Handle for
Drainage Valve
Pressure Relief
Hole
Pressure Relief
Valve
Cold Water
Hot Water

5
The drainage pipe that is connected to the pressure relief hole
must be kept sloping downwards.
Since the water temperature inside the heating tank can reach up
to 75oC, the hot water must not be directly flowed to human skin at
the initial use. Adjust the water temperature in accordance to
human skin endurance to avoid scalding.
If the flexible power supply cord is damaged, the special power
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 MODENA Customer Care for repair.
In order to avoid a hazard due to inadvertent resetting of the
thermal cut-out, this appliance must be not 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 0.8 MPa, and
the minimum inlet water pressure is 0.015 MPa.
When the water pressure is over 0.8 MPa, this will be automatically
activated the safety valve, and the water may drip from the
discharge pipe of the pressure-relief device (see 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 avoid
blockage in the pipes.
Draining away the water inside the inner tank can be done from the
pressure relief valve. Twist off the fixed screw of the pressure
relief valve and lift the handle of the drainage pipe valve upwards
(Picture 3). Every drainage pipe that connected to the pressure-
relief device has to be installed in a continuously downward
direction and in a frost-free environment.
Picture 2
Picture 3
Opened Water Drainage
Valve Position
Handle for Water
Drainage Valve
Water Outlet
Safety Valve
Fixed Screw Nail

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Nomenclature (The Terms to Classified Product Types
and Names)
ES XXD, ES XXDR, ES XXSR
ES = the product code of the electric storage water heater;
XX = the capacity of the water heater (L);
D / DR /SR = the series of the water heater;
Technical Performance Parameters
Model
Volume
(L)
Rated
Power
(W)
Rated
Voltage
(ACV)
Rated
Pressure
(MPa)
Max of
Water
Temp. (oC)
Protection
Class
Water-
proof
Grade
ES 10 D
10
250
220
0.75
75
1
IPX4
ES 15 D
15
350
220
0.75
75
1
IPX4
ES 30 D
30
800
220
0.75
75
1
IPX4
ES 10DR
10
250
220
0.75
75
1
IPX4
ES 15DR
15
250+350
220
0.75
75
1
IPX4
ES 30DR
30
400+800
220
0.75
75
1
IPX4
ES 20SR
20
350
220
0.75
75
1
IPX4
Brief Introduction of Product Structure
ES XXD
PART 2: PRODUCT INTRODUCTION
Picture 4
Picture 4

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ES XXDR
ES XXSR
ES 10D
ES 15D
ES 30D
ES 10DR
ES 15DR
ES 30DR
ES 20SR
A
355
400
455
355
400
455
750
B
355
400
455
355
400
455
271
C
295
312
388
295
312
388
293
D
66
66
66
66
66
66
300
*All dimensions are calculated in mm
Picture 5

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Installation Instruction
This electric storage water heater should 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 bricks wall, fill it with concrete cement completely, and use
the 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 XXD & ES XXDR: on the wall that is
strong enough, drill the hole with depth of approximately 45 mm.
Use the anchor fastener bolts provided along with the product for
securing the bracket (Picture 6a) firmly in the wall.
Align the slots on the back of the water heater with the projections
on the bracket and install the water heater on the bracket until it is
locked.
Methods of installation ES 20SR: after selecting a proper location,
determine the positions of the two installation holes that are used
for the expansion bolts with the hook (300 mm). Make two holes on
the wall with the corresponding depth by using a chopping bit with
the size matching the expansion bolts attached with the machine;
insert the Fischer screw (M8*80); tighten the nuts to fix firmly;
then, hang this water heater on it (see Picture 6b).
PART 3: INSTALLATION
Picture 6a
Picture 6
101 mm
69 mm
48.5 mm
135 mm

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Connect the power plug to the Installed power socket on the wall.
The power supply for this appliance is 220V. The power socket is
recommended to be placed on the right above the water heater.
The height of the power socket from the ground should not be less
than 1.8 m (see Picture 7). If there is a problem on the power cord,
it should be replaced by MODENA agencies or qualified person
who is able to do the repair so as to ensure the safety.
If the size of the bathroom is too small, the water heater can be
installed at another place. However, the water heater should be
installed closely to the stand-point of its usage to optimize the heat
of the water.
Picture 6b
Picture 7
300 mm
10 mm
E (Yellow/Green)
L (Brown)
N (Blue)
Ground
≥1.8 m

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Plumbing Connection
The dimension of each used pipe is G½ (”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 8).
If the users want to utilize a multi-ways supply system, refer to the
method shown in the Picture 9 for the connection of the plumbing.
Picture 10
Picture 9
Picture 8
Power Cord
Rubber Seal Gasket
Cold Water Inlet Pipe
Joint Screw for Cold Water Inlet
Hot Water
Rubber Seal Gasket
Hot Water Inlet
Handle for Mixing
Valve
Power Cord
Pressure Relief Valve
Water Inlet Pipe
Shower
Water Inlet Valve
Mixing Valve
Running Water
Pipe
Hot Water
Outlet
Triple Joint
Basin/
Water-pool
Pressure Relief Valve
Pressure Relief Hole
Cold Water
Inlet

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Operating Procedure
Check all the piping connection to avoid the leakage 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
appliance has been filled fully with water, so the outlet valve can be
closed.
Make sure that the heating tank is fully filled up with water;
otherwise, it will cause the heating elements to be damaged.
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 power plug should be off, and the
reset button should bounce up; then push down the reset button,
the indicator light will turns on to verify that the leakage protection
works well (see 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 that the power circuit leaks or the
power supply is disconnected.
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 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
should be ensured that there is a clearance not less than 0.2 m on
the right side of the water heater, for the convenient maintenance
of this water heater, if necessary.
PART 4: HOW TO USE

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If the indicator lights turn on, the thermostat will automatically
control the temperature. When water temperature inside the heater
has reached the set point, water heater will switch off
automatically. When water temperature falls below the set point,
water heater will be turned on automatically to restore the heating.
Operating the Water Heater
A. ES 10D, ES 15D, & ES 30D
Rotate the knob according to the marking on the knob to
increase or decrease the setting temperature.
The Red “Power” LED and Green “Heating” LED remain ON while
there is power to the system.
The Green LED will turns off when the water temperature
reaches the user setting at the end of the heating phase
Picture 11
Picture 4
Picture 10
Testing Button
Reset Button
Indicator Light
Power Plug

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B. ES 10DR
Specific Functions of Button and Display Screen
(1) “ON/OFF” Button
This button acts as an ON/OFF operating key. When this appliance
(the water heater) is connected to the power, the display screen is
fully bright for 2s. If the power to the memory function is
disconnected (there is power outage), this appliance will return to
the working condition before the power outage. Otherwise, system
will be in the “power-off” state. When in the power-on state, press
“ON/OFF” button to shut down the system. When in the power-off
state, press “ON/OFF” button to turn on the system. In this case,
the memory data at the time of power outage will be restored, and
the system will enter into the corresponding working condition.
Picture 12
NOTE
The “ON/OFF” button is the highest priority button among all
buttons in the system. That is, if you press it under all
failure-free working conditions, the system will enter into the
power-off state; no content is displayed in the power-off
state.
The number of the software version will be displayed after
the full-screen display for 2s (the double “8” digits will be
shown on the digital screen will turns into 01).
(Remote Control)

14
(2) “+” Button (Button on the Remote Controller)
This button is used cooperatively with the “BOOK” button to
adjust the booked time. The specific operations are shown in
the booking adjustment function.
Adjust setting temperature: temperature is adjusted in the
range of (Tmin)-(Tmin+1)-(Tmin+1)……75-(Tmin). The
temperature will increase by 1 oC after “+” button is clicked for
once. Long pressing “+” button will render the setting
temperature to increase at the rate of 5 oC/s. If no button is
pressed within 5s, the system will store the setting temperature
parameters and exit the temperature setting status.
(3) “-” Button (Button on the Remote Controller)
This button is used cooperatively with the “BOOK” button to
adjust the booked time. The specific operations are shown in
the booking adjustment function.
Adjusting temperature: temperature is adjusted in the range of
75-74-73-…-(Tmin+1)-(Tmin)-35. The setting temperature will
decrease by 1 oC after the “-” button is clicked for once. Long
pressing “-” button will render the setting temperature to
decrease at the rate of 5 oC /s. If no button is pressed within 5s,
the system will store the setting temperature parameters and
exit the temperature setting status.
(4) “BOOK” (HEATING TIME PROGRAMMING) Button
When the water heater is in the power-on state, press this button
to activate the booked time setting mode for the heating program.
At this moment, the booked time can be set through pressing “+” or
“-” button. The specific operations are shown in the booking
function introduction. This key will be invalid in the power-off state.

15
(5) LED Light Indicator (ES 10DR)
The Red “Heating” LED will remain ON during the heating process.
The Green “Ready” LED will turn on when the water temperature
reaches the user setting at the end of the heating phase; while the
Red LED will turns off.
Detailed Description of Functions
Heating/Heat Preservation Function
The system could identify the heating/heat preservation state and
will light up the corresponding indicator if there is a difference
between the actual temperature and the set temperature. When
the water heater is in the heating state, the “HEATING” indicator
will lights up (bright green), while the “READY” indicator lights up
(bright red) when in the heat preservation state.
The water heater could be directly heated to the set temperature
after it is just started or re-adjust the temperature. When the set
temperature is reached, the water heater will stop heating and
enter into the heat preservation state. If the difference between
the actual temperature and the set temperature is greater than the
previous temperature difference, the water will be heated again.
Booking Bath Function
When the appliance is in the power-on state, press the “BOOK”
button ( ). Then, the booking indicator will light up. The system
will enter into booked time adjustment state and the digital display
on the tank(tube) will flickers. At this moment, the user could adjust
the booked time for the heating process through pressing “+”or “-
”button
Delay Booking Function
This appliance adopts the delay booking function. By this function,
the hot water is available after “XX” hours (user’s set time). When in
the booking (heating time programming) state, the user cannot only
adjust the booked time circularly in the range of “01-02…-24-01” by

16
clicking “+” button, but also adjust the booking hours circularly in
the range of “24-23…-01-24” by clicking “-” button.
If the “ADJUST” button (or “+” or“-”buttons on the remote
controller) is long pressed, the time can be adjusted at a rate of 5
times per second. The operation chart of the booking function is
shown in Picture 13.
a. The setting of delay booking cannot set the minutes of the
booked time.
b. In the setting process of booked time, the set time shall flicker.
Pay attention to the following matters:
Do not press any button within 5s; then, confirms the
booking state.
Press the “BOOK” button, and then confirm the booking
mode immediately. During heating process, the
temperature could be set. However, the heating function
and differential heating return function can be identified
only in booking heating process (namely 1 hour). Besides,
“READY”indicator only lights up in the period when the
actual temperature decreases by 5 ℃after booking
heating is finished.
c. The set temperature could be adjusted under the booking
state.
d. The booking for one time is valid repeatedly.
e. The booking indicator is always on during the entire booking
process. When in the power-on state, pressing “BOOK” button
will cancel booking function.
State 1
Setting
Booking
Time
Time will be
successfully booked
if no button is
pressed in 5s.
Booking is
Activated
State 1
Press “+”/”–“ button
to adjust time
Book
Book
Picture 13

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f. Upon the completion of the booking setting, the system will
pre-heat 1 hour before. For instance, if the user books the
water usage for 6 hours later, the system will start heating
immediately after 5 hours from the current time. The booking
will also be conducted at the same time of tomorrow (24 hours
later), and so on. This process is valid for long time.
g. The disconnected power does not affect the booking, and this
product has the time memory function.
Power Outage Memory Function
This system possesses power outage memory function and could
store the working condition, the set temperature, and the relevant
information before outage. The system could return automatically
to the working condition before outage after charged with
electricity again.
Anti-freezing Protection Function
When in the non-heating state, if the water temperature in the
water heater is less than or equal to 6 oC, connect the water heater
to the corresponding heating tube to conduct heating:
Heating tube P1 Heating tube P2
The water heater could stop heating when the temperature
reaches 10oC (the heating mark is not displayed, i.e., hidden
heating).
NOTE
For ES 10DR, the power supply of the clock module has
automatic charging function. One time charging can maintain the
power during the power outage time for about 5 days. Booking
time accuracy cannot be ensured, if exceeding that period.

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Factory Setting Function
When in the power off state, if the “BOOK” button and the “POWER”
button are pressed for 3s simultaneously; the display screen will be
fully bright; and system will enter into the factory setting mode
(buzzer will ring, if any). Then, the system will enter to the
“heating/heat preservation” state after 2s. The factory setting
parameters are shown in the following table.
The Basic Parameters of the Factory Setting System
Function
Factory Setting Parameter
User setting temperature
70 ℃
Booked time
8 hours
Booking mode
Default cancel
Power
250 W (Heating at full speed)
C. ES 15DR & ES 30DR
Specific Functions of Button and Display Screen
(1) “ON/OFF” Button
This button acts as an ON/OFF operating key. When this appliance
(the water heater) is connected to the power, the display screen is
fully bright for 2s. If the power to the memory function is
disconnected (there is power outage), this appliance will return to
(Remote Control)
Picture 14

19
the working condition before the power outage. Otherwise, system
will be in the “power-off” state. When in the power-on state, press
“ON/OFF” button to shut down the system. When in the power-off
state, press “ON/OFF” button to turn on the system. In this case,
the memory data at the time of power outage will be restored, and
the system will enter into the corresponding working condition.
(2) “+” Button ( Button on the Remote Controller)
This button is used cooperatively with the “BOOK” button
to adjust the booked time. The specific operation is shown in
the booking adjustment function.
Adjust setting temperature: temperature is adjusted in the
range of (Tmin)-(Tmin+1)-(Tmin+1)……75-(Tmin). The
temperature will increase by 1 oC after “+” button is clicked for
once. Long pressing “+” button will render the setting
temperature to increase at the rate of 5 oC/s. If no button is
pressed within 5s, the system will store the setting temperature
parameters and exit the temperature setting status.
(3) “-” Button ( Button on the Remote Controller)
This button is used cooperatively with the “BOOK” button
to adjust the booked time. The specific operation is shown in
the booking adjustment function.
NOTE
The “ON/OFF” button is the highest priority button among all
buttons in the system. That is, if you press it under all failure-
free working conditions, the system will enter into the
power-off state; no content is displayed in the power-off
state.
The number of the software version will be displayed after
the full-screen display for 2s (the double “8” digits will be
shown on the digital screen will turns into 01).

20
Adjusting temperature: temperature is adjusted in the range of
75-74-73-…-(Tmin+1)-(Tmin)-35. The setting temperature will
decrease by 1 oC after the “-” button is clicked for once. Long
pressing “-” button will render the setting temperature to
decrease at the rate of 5 oC /s. If no button is pressed within 5s,
the system will store the setting temperature parameters and
exit the temperature setting status.
(4) “MODE” Button
When in the power-on state, press this button to enter into half
container/whole container switch, i.e., half container whole
container half container…, and the corresponding indicator will
lights up. If this button is long pressed for 3s, this water heater will
enter into the booking mode. At this time, it is allowed to set
booked time via “+” or “-” key. The specific operations are listed in
the booking function introduction. This key will be invalid in the
power-off state.
(5) “BOOK” (HEATING TIME PROGRAMMING) Button
When the appliance is in the power-on state: press this button to
enter into the booked time setting mode for the heating program.
At this moment, the booked time can be set through pressing “+” or
“-” button. The specific operations are shown in the booking
function introduction. This key will be invalid in the power-off state.
(6) “STERILIZER” Mode
In the power-on state: long press the “+” button and the “-”button
simultaneously for 3s. Then, the digital screen will display sterilizer
status (two digits 8 are in a clockwise cycle dynamitic display); long
press “+” and “-”buttons simultaneously for 3s again to exit the
status. The heating should stop when the temperature reaches
80oC and the antibacterial (sterilizer) mode is maintained for 5
minutes to indicate that cycle is still in dynamitic display. After 5
minutes, the system will exit sterilizer mode and return to the
previous status.