Bosch Tronic TR4500T 50 EB User manual

User and Installation manual
Electrical storage water tank
Tronic
TR4500T 30|50|80|100|120|150 EB
6 720 884 457 (2018/02) DK-(en)

2
Index
Tronic – 6 720 884 457 (2018/02)
Index
1 Key to symbols and safety instructions . . . . . . . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Security Measures . . . . . . . . . . . . . . . . . . . . . 3
2 Technical Characteristics and dimensions . . . . . . . 6
2.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Type overview . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Appliance Description . . . . . . . . . . . . . . . . . . 6
2.4 Anticorrosion protection . . . . . . . . . . . . . . . . 6
2.5 Accessories (included in the appliance
packaging) . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.6 Technical specifications . . . . . . . . . . . . . . . . 7
2.7 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.8 Electrical wiring diagram . . . . . . . . . . . . . . . 9
3 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Transport, storage and recycling
regulations . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 Important notes . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Siting the appliance . . . . . . . . . . . . . . . . . . . 10
5.3 Wall mounting . . . . . . . . . . . . . . . . . . . . . . . 11
5.4 Water connection . . . . . . . . . . . . . . . . . . . . 11
5.5 Electrical connections . . . . . . . . . . . . . . . . . 13
5.6 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1 Turning the appliance on/off . . . . . . . . . . . 15
6.2 Operating the heater – manual setting . . . 15
6.3 Operation of the heater in
the "BOOST" mode . . . . . . . . . . . . . . . . . . . 15
6.4 The Anti-Legionella Function . . . . . . . . . . . 15
6.5 Emptying the appliance . . . . . . . . . . . . . . . 16
7 Environment / disposal . . . . . . . . . . . . . . . . . . . . . . . 16
8 Inspection/Maintenance . . . . . . . . . . . . . . . . . . . . . 17
8.1 User information . . . . . . . . . . . . . . . . . . . . . 17
8.1.1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1.2 Safety valve verification . . . . . . . . . . . . . . . 17
8.1.3 Safety valve . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1.4 Maintenance and repair . . . . . . . . . . . . . . . 17
8.2 Periodic maintenance work . . . . . . . . . . . . 17
8.2.1 Functionality verification . . . . . . . . . . . . . . 17
8.2.2 Magnesium Anode . . . . . . . . . . . . . . . . . . . . 17
8.2.3 Periodic cleaning . . . . . . . . . . . . . . . . . . . . . 18
8.2.4 Long standing - non working
(more than 3 months) . . . . . . . . . . . . . . . . .18
8.3 Required actions after any maintenance
work has been carried out . . . . . . . . . . . . . .18
9 Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.1 Indication of errors . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3
Key to symbols and safety instructions
Tronic – 6 720 884 457 (2018/02)
1 Key to symbols and safety instructions
1.1 Key to symbols
Warnings
The following keywords are defined and can be used in this
document:
•NOTICE indicates a situation that could result in damage to
property or equipment.
•CAUTION indicates a situation that could result in minor to
medium injury.
•WARNING indicates a situation that could result in severe
injury or death.
•DANGER indicates a situation that will result in severe
injury or death.
Important information
Additional symbols
1.2 Security Measures
Installation
▶ Installation must only be carried out
by an authorised service.
▶ IEC 60364-7-701 must be observed
when installing the appliance and or
electrical accessories.
▶ The appliance must be installed in a
room free from the risk of frost.
▶ First connect the appliance
hydraulically and fill with water, then
connect the power supply.
▶ During the installation isolate the
appliance from the power supply.
▶ In a closed, pressurised system of
installation, it is obligatory to install a
safety valve on the inlet pipe with a
rated pressure of 0.6 MPa (6 bar),
0.9 MPa (9 bar) or 1.0 MPa (10 bar)
(see the label), which prevents the
elevation of pressure in the boiler by
more than 0.1 MPa (1 bar) above the
rated pressure.
▶ Water may drip from the outlet
opening of the safety valve, so the
outlet opening should be set to
atmospheric pressure.
▶ The outlet of the safety valve should
be installed facing downwards and in
a non-freezing area.
▶ To ensure proper functioning of the
safety valve, the user should perform
regular controls to remove limescale
and make sure the safety valve is not
blocked.
Warnings in this document are identified by
a warning triangle printed against a grey
background.
Keywords at the start of a warning indicate
the type and seriousness of the ensuing risk
if measures to prevent the risk are not taken.
This symbol indicates important information
where there is no risk to people or property.
Symbol Explanation
▶ Step in an action sequence
Cross-reference to another part of the document
•Listentry
–List entry (second level)
Table 1

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Key to symbols and safety instructions
Tronic – 6 720 884 457 (2018/02)
Installation and conversion
▶ Only permit an authorised service to
install this appliance.
▶ Do not install a stop valve between
the water heater and the safety valve,
because it will impair the pressure
protection of the heater!
▶ Before connecting it to the power
supply, the water heater must be
filled with water!
▶ The heater is equipped with an
additional thermal cut-off for
protection in case of failure of the
operating thermostat. In this case,
however, the temperature of the
water in the heater can reach up to
130 °C according to the safety
standards. During the water supply
installation, the possibility of
temperature overloads should be
taken into account.
▶ If the heater is to be disconnected
from the power supply, please drain
any water from the heater to prevent
freezing.
▶ Water can be drained from the heater
through the boiler inlet pipe. For this
purpose it is advisable to install a T-
element with an outlet valve between
the inlet pipe and safety valve.
▶ Neverobstructthe safetyvalve outlet.
▶ During the heat-up, water may be
expelled from the safety valve.
Maintenance
▶ Only authorised technicians are
permitted to service this appliance.
▶ Isolate the appliance from its power
supply before commencing any
maintenance work on the appliance.
▶ Customers are responsible for the
safety and environmental
compatibility of the appliance as well
as its maintenance.
▶ Use only original spare parts.
▶ To ensure compliance with all safety
requirements, a defective power
cable may only be replaced by an
authorised service.
▶ Please do not try to fix any defects of
the water heater on your own. Call the
nearest authorised service provider.
Instructing the customer (for the
installer)
▶ Instruct the customer in the function
and operation of this appliance.
▶ It is the responsibility of customers to
carry out regular maintenance and
inspections.
▶ The appliance must be serviced
annually.
▶ Inform customers that they must not
carry out any modifications or
repairs.
Safety of electrical appliances for
domestic use and similar purposes
The following requirements apply in
accordancewithEN 60335-1inorder to

5
Key to symbols and safety instructions
Tronic – 6 720 884 457 (2018/02)
prevent hazards from occurring when
using electrical appliances:
“This appliance can be used by children
of 8 years and older, as well as by people
with reduced physical, sensory or
mental capabilities or lacking in
experience and knowledge, if they are
supervised and have been given
instruction in the safe use of the
appliance and understand the resulting
dangers. Children must not play with the
appliance. Cleaning and user
maintenance must not be performed by
children without supervision.”
“If the power cable is damaged, it must
be replaced by the manufacturer, its
customer service department or a
similarly qualified person, so that risks
are avoided.”

6
Technical Characteristics and dimensions
Tronic – 6 720 884 457 (2018/02)
2 Technical Characteristics and
dimensions
2.1 Intended use
The appliance was designed to heat and store DHW. Comply
with all regulations and standards related to drinking water
applicable in the country.
Using the appliance for any other purpose will be considered
incorrect use. Bosch accepts no liability for any damage
resulting from such use.
2.2 Type overview
[TR] Tronic
[4500] Version
[T] Tank
[30] Capacity (liters)
[E] Electronic
[B] Bottom connections
2.3 Appliance Description
• Steel-glassed tank in conformity with the European
regulations
• Tank designed and built to withstand high pressures
• Exterior material: steel sheeting and / or plastic
• Easy handling
• Insulating material: polyurethane without CFC
• Anticorrosion protection: magnesium anode.
2.4 Anticorrosion protection
The inside of the tank is lined with homogeneous glass enamel,
completely neutral with regards to compatibility and contact
with potable water. This lining is neutral with regard to the use
with potable water. The existence of a magnesium anode
provides additional anticorrosion protection.
2.5 Accessories (included in the appliance
packaging)
Fig. 1
[1] Bracket
Water characteristics Unit
Water hardness, min. ppm
grain/US gallon
°dH
120
7.2
6.7
pH, min. – max. 6.5 – 9.5
Conductivity, min. – max. μS/cm 130 – 1500
Table 2 Water characteristics
TR 4500 T 30 E B
TR 4500 T50 E B
TR 4500 T 80 E B
TR 4500 T100 E B
TR 4500 T 120 E B
TR 4500 T150 E B
Table 3

7
Technical Characteristics and dimensions
Tronic – 6 720 884 457 (2018/02)
2.6 Technical specifications
This appliance meets the requirements specified by the
European Directives 2014/35/EC and 2014/30/EC.
Technical characteristics Unit TR4500 30 TR4500 50 TR4500 80 TR4500
100
TR4500
120
TR4500
150
General characteristics
Declared load profile S M M L L XL
Energy efficiency class1)
1) EU Regulation 812/2013; EN 50440
BCCCCC
Water heating energy efficiency
(wh)1)
[%) 33,5 37,2 36,9 38,1 37,4 38,1
Annual electricity consumption1) [kWh] 550 1382 1393 2687 2739 4399
Daily electricity consumption2)
2) EN 50440
[kWh] 2,626 6,425 6,490 12,410 12,715 20,322
Thermostat temperature settings 60 °C
Value of “smart” 000000
Volume [l] 29,1 48,3 78,0 97,3 118,1 147,1
Quantity of mixed water at 40 °С
V402)
[l] -66 116 137 172 225
Sound power level indoors db(A) 15 15 15 15 15 15
Water details
Working pressure [MPa
(bar)]
1,0 (10)
Net Weight (empty) kg 19 28 34 39 44 50
Weight when full kg 49 78 114 139 164 200
Anti-corrosion of tank enamelled & Mg Anode
Water connections Pol. G3/4
Electrical characteristics
Power of electrical heater [W] 4200 6000
Number and power of heating
elements
[W] 6 x -700 6 x -1000
Voltage VAC 1/N/PE 230V~; 50Hz
3/N/PE 400V~; 50Hz
Protection class I
Type of protection IP 24
Heating time at 230V
from 10 °C to 65 °C
0 h 59 m 1 h 38 m 2 h 37 m 3 h 16 m 3 h 55 m 4 h 54m
Heating time at 400V
from 10 °C to 65 °C
0 h 59 m 1 h 38 m 2 h 37 m 3 h 16 m 3 h 55 m 4 h 54m
Table 4 Technical characteristics

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Technical Characteristics and dimensions
Tronic – 6 720 884 457 (2018/02)
2.7 Dimensions
Fig. 2 Dimensions in mm (Vertical installation on a wall)
Appliance A B C D E F G
30... 510 310 235 70 110 180 420
50... 610 400 240 100 100 260 500
80... 830 600 260 100 100 360 500
100... 975 750 255 100 100 510 500
120... 1130 900 260 100 100 510 500
150... 1345 1100 275 100 100 510 500
Table 5

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Technical Characteristics and dimensions
Tronic – 6 720 884 457 (2018/02)
2.8 Electrical wiring diagram
Fig. 3 Electric circuit diagram (30L heater)
[1] Connection terminal
[2] Electronic regulator
[3] Relay
[4] Thermal cut-out
[5] Electric heating elements (6x700W)
[L1] Live conductor
[L2] Live conductor
[L3] Live conductor
[N] Neutral conductor
[PE] Earthing conductor
Fig. 4 Electric circuit diagram (50L - 150L heaters)
[1] Connection terminal
[2] Electronic regulator
[3] Relay
[4] Thermal cut-out
[5] Electric heating elements (6x1000W)
[L1] Live conductor
[L2] Live conductor
[L3] Live conductor
[N] Neutral conductor
[PE] Earthing conductor
CAUTION: Electric shock!
▶ Before any intervention into the interior
of the water heater, disconnect it from
the power supply network! This
intervention may only be performed by a
trained professional!

10
Regulations
Tronic – 6 720 884 457 (2018/02)
3Regulations
The country’s regulations currently in force must be fulfilled for
the installation of the electric appliances.
4 Transport
▶ Do not drop the appliance.
▶ Remove the appliance from the packaging only at the place
of installation.
4.1 Transport, storage and recycling regulations
• The equipment should be stored in protected areas against
negative temperatures.
• Whenever applicable, the EU 2002/96/EC directive
imposed and the differentiated collection / gathering of
used electrical and electronic equipment.
5 Installation
5.1 Important notes
The water heater shall be installed as close as possible to the
outlets. When installing the water heater in a room with a
bathtub or shower, take into account the requirements defined
in IEC Standard 60364-7-701 (VDE 0100, Part 701).
It has to be fitted to the wall using appropriate wall screws with
a minimum diameter of 8 mm. A wall with a poor load-bearing
capacity must be properly reinforced where the heater will be
installed. The water heater may only be fixed upon the wall
vertically.
To facilitate future service interventions, you are advised to
install the heater in accordance with the installation
measurements.
5.2 Siting the appliance
Dispositions relative to the place of installation
• Comply with country-specific requirements
• Never install the appliance above a heat source.
• Never install the appliance in rooms where the ambient
temperature can fall below 0 °C.
• Install the appliance near the most frequently used draw-
off point to keep energy losses and waiting times to a
minimum.
• Install the appliance in a room that permits the replacement
of the magnesium anode, and necessary maintenance
procedures.
Protection areas 1 and2
▶ Do not install in protection areas 1 and 2.
▶ Install the appliance outside the protection areas at a
distance greater than 60 cm, of the bath.
Installation, power connection and
commissioning must only be carried out by a
service approved for such work by the local
entities.
CAUTION:
▶ Do not drop the appliance.
▶ Remove the appliance from the
packaging only at the place of
installation.
▶ Wherever applicable, comply with the
IEC 60364-7-701 norm on installing the
appliance and / or any electric
accessories.
▶ Chose a sufficiently robust wall to
support the appliance with the tank full
(see tab. 5).
CAUTION: Damage to the heating elements!
▶ Firstly connect all the water connections
and fill the appliance.
▶ Connect the appliance to the electric
point, assuring connection to earth.
CAUTION:
▶ Chose a sufficiently robust wall to
support the appliance with the tank full
(Tab. 4).
CAUTION:
▶ Make sure that the appliance is
connected to the DB board (electrical
board) with a connection to the earth
cable.

11
Installation
Tronic – 6 720 884 457 (2018/02)
Fig. 5 Protection areas
5.3 Wall mounting
Vertical installation
Fig. 6 Vertical installation
5.4 Water connection
The water heater connections for the inlet and outlet of water
are colour-coded. The inlet of cold water is marked with blue
colour, while the hot water outlet is marked with red colour.
The water heater can be connected to the water supply in two
ways. The closed-circuit pressure system enables several
points of use, while the open-circuit gravity system enables a
single point of use only. The mixer taps must also be installed in
accordance with the selected installation mode.
▶ Identify the piping for hot and cold water, in order to avoid
a possible swop (Fig. 7).
Fig. 7
[1] Cold water inlet (right hand side)
[2] Hot water outlet (left hand side)
In a closed, pressurized system (Fig. 8) pressurised mix
taps should be used at the outlet points. To ensure safe
operation of the heater a safety valve should be installed on the
inlet pipe to prevent elevation of pressure for more than 0.1
MPa (1 bar) above the nominal pressure. The outlet opening on
the safety valve must be equipped with an outlet for
atmospheric pressure. The heating of water in the heater
causes the pressure in the tank to increase to the level set by
the safety valve. As the water cannot return to the water supply
system, this can result in dripping from the outlet of the safety
valve. The drip can be piped to the drain by installing a catching
unit just below the safety valve. The drain installed below the
CAUTION: Appliance fall!
▶ Use sleeves and hooks (according with
the type of wall) to fix the bracket that
can hold the appliance with the tank full.
CAUTION: Damage to appliance
connections through contact corrosion!
▶ Use galvanized insulators in your water
connections. These will avoid galvanic
electric currents between the hydraulic
link metals and, consequently corrosion
of these.
225 cm
6 720 612 659-13.3TT
22 11
60 cm
60 cm
NOTICE: Material damage!
▶ Install a filter at the water inlet in areas
where the water contains particles or
sediments.
It is recommended:
▶ to purge the system before appliance
installation, the existence of sand can
cause a reduction in flow or even cause a
total obstruction.

12
Installation
Tronic – 6 720 884 457 (2018/02)
safety valve outlet must be piped down vertically and placed in
an environment that is free from the onset of freezing
conditions.
To avoid water dripping from the safety valve, an expansion
tank should be installed on the inlet pipe of the heater with the
capacity of at least 5% of the heater volume.
To ensure proper operation of the safety valve, periodical
inspections must be carried out to remove limescale and make
sure the safety valve is not blocked. To check the valve, open
the outlet of the safety valve by turning the handle or
unscrewing the nut of the valve (depending on the type of the
valve). The valve is operating properly if the water comes out of
the nozzle when the outlet is open.
An open-circuit, non-pressurised system (Fig. 9) requires the
installation of a non-return valve at the water inlet to prevent
water draining out from the tank in the event of the water
supply running dry. This installation mode requires the use of
an instantaneous mixing tap.
As the heating of water expands its volume, this causes the tap
to drip. The dripping cannot be stopped by tightening it further;
on the contrary, the tightening can only damage the tap.
▶ Use the appropriate connection accessories to do the
hydraulic connection to the appliance.
Fig. 8 Closed (pressure) system
[1] Pressure mixer taps
[2] Expansion tank
[3] Safety valve
[a] Test valve
[b] Non-return valve
[4] Funnel with outlet connection
[5] Checking fitting
[6] Pressure reduction valve
[7] Test valve
[H] Cold water
[T] Hot water
Fig. 9 Open (non-pressure) system
[7] Test valve
[8] Non-return valve
[9] Low pressure mixer tap
[H] Cold water
[T] Hot water
The heater can be connected to the domestic water supply
network without a pressure-reducing valve if the pressure in
the network is lower than the nominal pressure. If the pressure
in the network exceeds the nominal pressure, a pressure-
reducing valve must be installed.
In the case of freezing:
▶ Switch off the appliance.
▶Purgetheappliance(Chapter 6.5).
Safety valve
No closing valve may be built-in between the
water heater and return safety valve,
because with it the pressure protection
would be impeded!
DANGER:
▶ Install a safety valve at the water inlet of
the appliance (Fig. 8).
NOTICE:
NEVER OBSTRUCT THE PURGE OUTLET OF
THE SAFETY VALVE.
Never install any accessory between the
safety valve and the cold-water inlet (right
hands side) of the appliance.

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Installation
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5.5 Electrical connections
All adjusting devices, verification and safety mechanisms were
submitted to a rigorous test in factory and are ready to work.
Before connecting to the power supply network,
▶ Install a power supply cord in the water heater, with a min.
diameter of 1.5 mm2 (H05VV-F 5G 1.5 mm2). To do this,
the protective plate must be removed from the water
heater.
In the electrical installation, please install a disconnect switch
to separate all poles from the power supply network in
accordance with the national regulations.
Fig. 10 Removing the protective cover
If the pressure at the cold water inlet is
superior to that of 80% of the maximum
pressure of the appliance at, ie: 6,4 bar:
▶ Install a reducing valve (Fig. 8).
The safety valve will trigger every time the
water pressure in the appliance exceeds 6,4
bar. A facility for draining the expelled water
must be provided.
DANGER:
By electrical discharge!
▶ Before working on the electrical
components, firstly cut the power,
(fuse, circuit breaker or other).
CAUTION:
Electrical protection!
▶ The appliance should dispose of an
independent connection to the DB
board (electric board), protected by a
30 mA differential circuit breaker and
earthing.
The electrical connection must be realized in
accordance with the current country laws
regarding electrical installations.

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Installation
Tronic – 6 720 884 457 (2018/02)
5.6 Start-up
When filling the heater for the first time, the tap for the hot
water on the mixing tap must be opened. When the heater is
filled with water, the water starts to run through the outlet pipe
of the mixing tap.
Before start-up,
▶ Verify that the appliance has been correctly installed and
assembled.
▶ Open the water inlet valves.
▶ Open all the hot water taps in order to ensure all the air is
out of the connections.
▶ Control the tightness of all the connections and ensure that
the appliance fills to its full capacity.
▶ Connect the appliance to the electric current.
▶ Inform the customer of any user information of the
appliance and handling.
Before connecting it to the power supply, the
water heater must be filled with water.

15
Use
Tronic – 6 720 884 457 (2018/02)
6Use
After it has been connected to the water and power supply grid,
the heater is ready to be used. When connected to the power
supply, the heater runs in standby mode. In the standby mode,
the heater maintains the water temperature of 10 °C.
Fig. 11 User interface
[1] Display of the set/actual temperature of water in the
heater, signalisation of errors
[2] On/Off button, temperature setting
[3] "BOOST" mode indicator
[4] On/Off button for the "BOOST" mode
6.1 Turning the appliance on/off
Turn on
▶ Hold the button (fig. 11, [2]) for about 3 seconds.
Standby
▶ Hold the button (fig. 11, [2]) for about 3 seconds, the
heater goes into standby.
Turn off
▶ Unplug the appliance.
6.2 Operating the heater – manual setting
To set the temperature,
▶ Press button (fig. 11, [2]) until you get the desired
temperature level (preset temperature level is 57 °C).
Once the maximum level ,
▶ Press the button (fig. 11, [2]).
The temperature returns to the first setting .
We recommend the setting. This setting is the most
energy-efficient. The temperature of water is about 57 °C,
while limescale production and heat loss will be smaller than in
case of higher temperature settings.
The temperature of water in the heater is indicated on the
display (fig. 11, [1]).
If the heater will not be used for a longer period of time, please
protect its contents from freezing by setting the temperature to
the position. At this setting, the heater will maintain the
temperature of water at about 10 °C.
6.3 Operation of the heater in the "BOOST" mode
This mode is useful when you need a large quantity of hot water
immediately. In the "BOOST" mode the heater uses the main
heating elements as well as auxiliary heating elements to heat
water quickly.
You can choose between one-time or constant activation of the
"BOOST" mode.
For one-time activation,
▶ Press button [4] shortly.
The heater’s operation in the "BOOST" mode is indicated
by control light [3], which remains on until the water in the
heater is heated to the set temperature.
For constant operation of the "BOOST" mode,
▶ Hold button [4] for 3 seconds.
The heater’s operation in the "BOOST" mode is indicated
by control light [3]. The "BOOST" mode can be turned off
by pressing button [4].
6.4 The Anti-Legionella Function
If the water in the heater does not reach 65 °C for 14
consecutive days, the anti-legionella function heats the water
to 70 °C and maintains this temperature for 120 minutes.
CAUTION: The first start-up of the appliance
must be carried out by an authorized
technician, which will provide the user with
all the necessary information to the best
working and handling of the device.
Symbol Description
Freeze protection, temperature about 10 °C
Water temperature about 35 °C
Water temperature about 57 °C
Water temperature about 75 °C
Table 6 Control panel symbols

16
Environment / disposal
Tronic – 6 720 884 457 (2018/02)
6.5 Emptying the appliance
▶ Unplug the appliance from the power supply.
▶ Switch off the water cutting valve and open a hot water tap.
▶ Open the safety valve (Fig. 12).
▶ Wait until the appliance is completely empty.
Fig. 12 Manual activation of the safety valve
Refill the appliance
When refilling the heater with water it is recommended to open
the warm water tap on the mixing tap and let the water run for
at least two minutes through the outlet pipe (the water stream
should be steady, medium strength, about as thick as a pencil).
7 Environment / disposal
Environmental protection is a fundamental corporate strategy
of the Bosch Group.
The quality of our products, their efficiency and environmental
safety are all of equal importance to us and all environmental
protection legislation and regulations are strictly observed.
We use the best possible technology and materials for
protecting the environment taking into account of economic
considerations.
Packaging
We participate in the recycling programmes of the countries in
which our products are sold to ensure optimum recycling.
All of our packaging materials are environmentally friendly and
can be recycled.
Old electrical and electronic appliances
Electrical or electronic devices that are no
longer serviceable must be collected
separately and sent for environmentally
compatible recycling (in accordance with the
European Waste Electrical and Electronic
Equipment Directive).
To dispose of old electrical or electronic
devices, you should use the return and
collection systems put in place in the country
concerned.
DANGER: Burn risk!
Open a hot water tap to and verify the
temperature of the water in the appliance
before opening the safety valve.
▶ Wait until the water temperature
decreases in order to avoid burns or any
other damage.
6720643873-06.1V

17
Inspection/Maintenance
Tronic – 6 720 884 457 (2018/02)
8 Inspection/Maintenance
8.1 User information
8.1.1 Cleaning
▶ Never use abrasive, corrosive or solvent cleaning
detergents.
▶ Use a soft cloth and mild detergent intended for cleaning
smooth varnished surfaces.
▶
8.1.2 Safety valve verification
▶ Verify that the water is expelled during the heating process
through the safety purge valve.
▶ Never obstruct the safety purge valve outlet.
8.1.3 Safety valve
▶ Manually open the safety valve at least once a month (Fig.
12).
8.1.4 Maintenance and repair
▶ It is the responsibility of the client to regularly call out
technical assistance or an authorized technician to perform
periodic maintenance.
8.2 Periodic maintenance work
With regular service inspections you will ensure faultless
functioning and long life of the heater.
1. Tank corrosion warranty applies only if all the prescribed
regular inspections of the protective anode wear have been
made.
2. The period between regular inspections should not be
longer than stated in the terms and conditions.
3. Inspections should be carried out by authorised service
providers that will record each inspection on the warranty
statement of the product.
4. Upon inspection the service provider will inspect the
amount of wear on the anti-corrosion anode and, if
necessary, clean the limescale that accumulates
depending on the quality, quantity and temperature of the
water inside the heater.
5. The service provider will also recommend the date for the
next inspection depending on the condition of the heater.
6. With regular service inspections you will ensure faultless
functioning and long life of the heater.
▶ Only make use of genuine replacement parts.
▶ Order the replacement parts in accordance with the parts
catalogue for the appliance.
▶ When carrying out maintenance work change the
disassembled joints and replace these with new ones.
8.2.1 Functionality verification
▶ Verify the good working order of all the elements.
8.2.2 Magnesium Anode
Maintenance must only be carried out by an
authorized technician.
WARNING:
Water leakage!
▶ Turn off all electric current.
▶ Turn off the water cut off valve
(Fig. 8).
WARNING:
▶ Ensure the purging of the water does not
cause any damage to persons or goods.
WARNING:
Do not attempt to fix any defects of the
heater by yourself:
▶ Call the nearest authorised service
company.
WARNING:
Before carrying out any maintenance work:
▶ Turn off all electric current.
▶ Turn off the water cut off valve
(Fig. 8).
CAUTION: Damages to the glass enamel!
Never clean the enamel interior of the
appliance with decalcifying agents. The
magnesium anode ensures anti corrosion
protection. There is no need for alternative
products for the protection of the enamel.
This appliance disposes of an anti-corrosion
magnesium anode in the inside.

18
Inspection/Maintenance
Tronic – 6 720 884 457 (2018/02)
▶ Switch off the circuit breaker feeding the appliance.
▶ Before starting, verify that the appliance is disconnected
from the electric current.
▶ Completely drain the appliance (section 6.5).
▶ Remove the lid of the appliance, by unscrewing the fixing
screws.
▶ Unscrew the flange fastening nut.
▶ Disconnect the connecting cables to the thermostat [1].
▶ Remove the flange [2].
▶ Verify the magnesium anode and replace it if necessary.
Fig. 13 Access and identifying internal components
[1] Fastening screw
[2] Flange
[3] Magnesium anode
8.2.3 Periodic cleaning
▶ Turn off all hot water taps.
▶ Inform all residents of the danger of burns.
▶ Position the thermostat on the maximum position (
Fig. 11).
▶ Wait until the indicator turns off.
▶ Open all the hot water taps, starting with the nearest one to
the furthest one from the appliance, and purge all the hot
water from inside the appliance, at least 3 minutes.
▶ Turn off all the hot water taps, and position the thermostat
on the normal working position.
8.2.4 Long standing - non working (more than 3 months)
▶ Switch off the electric current to the appliance.
▶ Drain the appliance completely.
▶ Fill the appliance until the water comes out from all the hot
water taps.
▶ Turn on the appliance to the electric current.
8.3 Requiredactions after any maintenance work
has been carried out
▶ Refasten and check the fastness of all the water
connections.
▶ Turn on the appliance.
WARNING:
It is forbidden to operate the appliance
without an installed magnesium anode.
WARNING:
The magnesium anode needs to be tested
every second year and replaced if
necessary, failing to do so will result in the
termination of the warranty. The appliance
without this type of protection will not be
covered by the manufactures warranty.
2
672087523-07.1V
1
3
DANGER: Burn risk!
During the periodic cleaning process the hot
water may cause serious burns.
▶ Carry out this operation outside working
hours.
After a long period of inactivity you should
change the water inside the appliance (more
than 3 months).

19
Problems
Tronic – 6 720 884 457 (2018/02)
9Problems
9.1 Indication of errors
In case of error, control lights start to flash on the display
(fig. 11[1]).
In the following diagram there are some solutions described for
possible problems / errors.
DANGER:
Assembly, maintenance and repairs should
only be carried out by authorized
technicians.
Error Error description Signalization Solution
E1 Temperature sensor error Repeated 2x quick pulse of the control
light on the display (fig. 11, [1]).
▶ Call service (heater out of order).
E5 Overheating
(temperature > 90 °C)
Repeated 3x quick pulse of the control
light on the display (fig. 11, [1]).
The error is automatically deleted when
the temperature drops below the set value.
Should the error repeat,
▶ Call the service company.
E44 Dry start Repeated 4x quick pulse of the control
light on the display (fig. 11, [1]).
Fill the heater with water. The error is
deleted by switching off the heater or by
holding button (11, [2]) for 3 seconds.
Table 7