Ferroli LEB TS Operating manual

EN
USER AND INSTALLATION MANUAL
RO
MANUAL DE UTILIZARE ȘI INSTALARE
PL
INSTRUKCJA OBSŁUGI I MONTAŻU
HR
PRIRUČNIK ZA KORISNIKA I INSTALACIJU
EL
ΕΓΧΕΙΡΙΔΙΟ ΧΡΗΣΤΗ ΚΑΙ ΕΓΚΑΤΑΣΤΑΣΗΣ
BG
РЪКОВОДСТВО ЗА МОНТАЖ И ЕКСПЛОАТАЦИЯ
SQ
MANUALI I PËRDORIMIT DHE INSTALIMIT
NL
GEBRUIKS- EN INSTALLATIEHANDLEIDING
HU
HASZNÁLATI ÉS TELEPÍTÉSI ÚTMUTATÓ
WALL MOUNTED ELECTRIC BOILER
BOILER ELECTRIC MONTAT PE PERETE
NAŚCIENNY ELEKTRYCZNY POJEMNOŚCIOWY OGRZEWACZ WODY
ZIDNI ELEKTRIČNI BOJLER
ΕΠΙΤΟΙΧΙΟ ΗΛΕΚΤΡΙΚΟ ΜΠΟΪΛΕΡ
ЕЛЕКТРИЧЕСКИ КОТЕЛ ЗА МОНТАЖ НА СТЕНА
BOILER ELEKTRIK PËR MONTIM NË MUR
ELEKTRISCHE BOILER VOOR WANDMONTAGE
FALRA SZERELHETŐ ELEKTROMOS KAZÁN
LEB TS
Rev. 00 - 11/2018

2EN Rev. 00 - 11/2018
LEB - TS
1 USER INSTRUCTIONS...................................................................................................................................4
1.1 lntroduction................................................................................................................................................................ 4
1.2 Safety of goods and persons..................................................................................................................................... 4
1.3 Control panel............................................................................................................................................................. 5
1.4 Keys functions........................................................................................................................................................... 6
1.5 Faults remedy............................................................................................................................................................ 7
1.6 Functions................................................................................................................................................................... 7
1.7 Menu ......................................................................................................................................................................... 8
1.8 Filling of the installation............................................................................................................................................. 9
2 MOUNTING...................................................................................................................................................10
2.1 0perating Condition and mounting location............................................................................................................. 10
2.2 Mounting the heating unit.........................................................................................................................................11
2.3 Water pipes connection........................................................................................................................................... 12
2.4 Performance of the electric connections Electric cable connection ........................................................................ 12
3 SERVICE AND REPAIRS .............................................................................................................................14
3.1 Commissioning........................................................................................................................................................ 14
3.2 Maintenance............................................................................................................................................................ 14
3.3 Repairs.................................................................................................................................................................... 14
3.4 Faults remedy.......................................................................................................................................................... 15
4 TECHNICAL CHARACTERISTICS AND PARAMETERS............................................................................16
4.1 Dimensions and joints ............................................................................................................................................. 16
4.2 Heating unit’s general drawing and main components............................................................................................ 17
4.3 Hydraulic scheme.................................................................................................................................................... 18
4.4 Circulating pump diagram ....................................................................................................................................... 18
4.5 Technical parameters .............................................................................................................................................. 19
4.6 Heating unit circuit scheme ..................................................................................................................................... 21

3
EN
Rev. 00 - 11/2018
LEB - TS
1 Dear Customer,
2 Thank you for choosing the wall-mounted electric boiler (heating unit) intended to be used in the heating system and
designed to provide comfort.
3 The LEB - TS electric heating unit is manufactured with state-of-the-art technology to guarantee reliability and satisfy your
needs. Please follow the installation and maintenance basic requirements. So, please read carefully this manual before
using the unit and follow its instructions.
4 We hope that the LEB - TS electric heating unit will create an environment in which you will enjoy thermal comfort.
5 Please observe the following warnings and recommendations:
6 1. Install and maintain the heating unit and its auxiliary devices according to the indications that correspond to this model,
following all regulations and standards in force and the supplier’s technical specications.
7 2. Mount the heating unit in the specied conditions in order to make sure that all the protection and operating devices
work well for their intended purpose.
8 3. Make sure that the heating unit is commissioned by the supplier or by the supplier’s authorized personnel.
9 4. For the heating unit commissioning as well as in the event of failures, please contact the specialized personnel as indi-
cated by the supplier. Any intervention by unauthorized personnel may lead to the heating unit breakdown (and possible
failures of the auxiliary devices).
10 5. Check the accessories integrity.
11 6. Check the delivered models to make sure that they are what you ordered.
12 7. In case you have any doubts as to the safe operation of the heating unit, please read carefully this manual and follow
its instructions.
13 8. Please do not remove or destroy the stickers and the identication plates attached to the heating unit.
14 9. The heating unit complies with the following standards: EN 60335-1:2012+AC:2014+A11:2014.
15 10. At the end of the service life, please recycle the heating unit and its accessories in compliance with the legislation in
force.
16

4EN Rev. 00 - 11/2018
LEB - TS
1 USER INSTRUCTIONS
1.1 lntroduction
1 In order to follow the development trends in the eld, FERROLI decided to launch the LEB - TS series direct heating
electric units with capacities of 6kW~28kW.
2 This is a highly efcient heating boiler, which means that the entire operation system is designed independently of the
heating system. The heating unit’s use with its intended applications is easy, through the LCD screen control panel.
1.2 Safety of goods and persons
1 Use the heating unit in accordance with the requirements included in this manual and in the manual’s annexes. It is very
important to ensure the proper operation of the heating unit, avoiding unauthorized access of children, of persons under
the inuence of drugs and alcohol, of all persons without discernment etc.
2 The supplier provides the products in compliance with the corresponding regulations and standards, as well as the pro-
ducts from the series as per the ISO 9001 quality management system.
3 After you gained access to the contractual party’s network, to which you agreed, make sure you remain informed with
regard to the products improvements (for instance, those concerning mounting, commissioning, and when you use the
heating unit, those concerning the unit’s adjustment and control, with a view to local conditions, during and after the gua-
rantee period).
4 IMPORTANT SAFETY INSTRUCTIONS
5 READ CAREFULLY AND STORE FOR FUTURE USE.
• This appliance may be used by children 8 years of age and older and by persons with physical or mental impairments
or by inexperienced persons, if they are properly supervised or have been informed about how to use this product in
a safe manner and understand the potential dangers. Cleaning and maintenance performed by the user must not be
performed by unsupervised children.
• Children from 3 to 8 years of age may only turn this appliance on and off under the condition that it is located or in-
stalled in its intended normal operating position and that they are under supervision or were informed about the safe
operation of the appliance and understand the potential hazards. Children from 3 to 8 years of age must not insert
the plug into the power socket or clean the appliance or carry out maintenance performed by the user.
• Children younger than 3 years of age should be prevented from accessing the appliance unless they are under con-
stant supervision.
• Children must not play with the appliance.

5
EN
Rev. 00 - 11/2018
LEB - TS
1.3 Control panel
1.3.1 Display
1.3.2 LCD screen
1 The control panel has 8 keys, 1 screen and 2 buttons.
g. 1 -
S/N Description
1Indicator for heating programming in winter mode.
2Indicator for the program’s intervals. Divide a day (24 hours) in 48 time intervals, and the indicator will be started simultaneously
with the chronometer function indicator.
3
Time intervals for the heating programming. By setting a time interval, it is possible to start and stop some indicators for the re-
spective individual time interval. If the indicators start, there is a heating request. Otherwise, no heating request for the respective
interval is recorded.
4Current time indicator.
5
Outside temperature indicator. After installing the probe for outside temperature and performing the conguration in the main pa-
nel, the indicator displays the probe’s temperature
readings of the outside temperature.
6Domestic hot water (DHW) indicator. It is permanently displayed in DHW tank conguration, summer or winter, and blinks while
setting a DHW target temperature.
7
Inside temperature indicator. When the OT thermostat is connected, it displays the OT thermostat’s readings to render the room’s
temperature; the thermostat could also render the
temperature detected in the room temperature probe mounted in the system.
8Domestic hot water (DHW)operating indicator. It blinks when the heating unit operates in the DHW mode or when the target tem-
perature for domestic hot water is set.
9Heating functioning indicator. It blinks during heating or when the adjusted heating temperature is set.
10 Heating indicator. Displayed in “winter” mode.
11
Display of the menu, faults and temperature. When the target heating temperature is set, it blinks to indicate the target heating
temperature, and when the water target temperature is set, it blinks to indicate the target temperature of the domestic hot water. In
the status without settings and without faults, it indicates the current temperature of the domestic hot water in the summer mode,
or in the domestic hot water modes during the winter. In the winter mode, it
indicates the current temperature of the domestic hot water (DHW), and during the heating of the DHW tank, it indicates the tem-
perature inside the tank.
12 Power indicator. It shows the current thermal power, totalizing 3 exchanges.
13 Circulating pump operation indicator. It is started when the pump operates.
14 Winter mode indicator. It is started when the boiler is set in the winter mode.
15 Summer mode indicator. It is started when the boiler is set in the summer mode.
16 Floor heating indicator. It is started when the oor heating mode is selected. Usually it is off.
17 Dometic hot water (DHW) tank connection indicator. It is on when the system usesaDHW tank.

6EN Rev. 00 - 11/2018
LEB - TS
1.4 Keys functions
g. 2 -
A: Key for the activation of the heating program:
Press the key to activate/deactivate the heating program. Keep the key pressed for 3 seconds to activate the setting of hour and
heating intervals. In the summer mode, the key has no function.
B: Domestic hot water (DHW) tank key:
To connect the DHW tank to the electric heating unit, press the DHW key to activate or deactivate the DHW tank mode.
C: Floor heating key:
Press the oor heating key to switch between radiator and oor heating when the electric heating unit is in the heating mode.
When the oor heating mode is activated, you can set a temperature of up to 60°C for the heating water (allowed variation interval
is 30-60°C). After heating, the temperature value may vary by 8°C.
When the oor heating mode is deactivated, you can set a temperature of up to 80°C for the hot water (allowed variation interval
is 30-80°C).
D: Set key:
The key functions in the setting menu. For more details, please see the next chapter.
E: OK key:
Shortly press the key to immediately exit the setting menu, if you are in the setting menu, and save the most recently performed
changes.
F: Key to select the winter and the summer modes:
Press the key to select the winter and the summer modes, to switch between the electric heating unit’s winter and summer mo-
des.
G: Reset key:
Shortly press the key to erase the fault status. In the case of faultless status and setting status, shortly press the key to exit the
setting status. Keep the key pressed for 10 seconds to activate the setting menu.
H: On/Off key:
Press the On/Off key to activate the switch between the electric heating unit’s start and stop.
In the status without settings and faults, press the key once to go to the Off mode and end all requests, and the LCD screen will
show the message “Stopped”. Only the water pump’s anti-blocking device and the anti-blocking device of the anti-freeze pro-
tection will continue to function. While in the “Stopped” mode, for the protection against frost of the electric heating unit or of the
domestic hot water (DHW) tank, the LCD screen will show the message “FD”, indicating the fact that the anti-freeze protection
device is in operation. To return to the standby mode, press again the On/Off key.
I: Heating button:
The button can be freely turned and can be used to set the temperature of the heating water and of other parameters. In the
status without settings and faults, turn the button to change the heating water target temperature. At that moment, the indicator
for heating and the indicator for heating functioning could blink. To exit the setting status, press the reset key.
J: Domestic hot water button:
The button can be turned freely and can be used to set the domestic hot water temperature and other parameters. In the status
without settings and faults, turn the button to change the domestic hot water target temperature. At that moment, the heating
indicator and the heating functioning indicator ash intermittently. To exit the setting status, press the reset key.

7
EN
Rev. 00 - 11/2018
LEB - TS
1.5 Faults remedy
1 The heating unit operates improperly when the following fault codes are displayed intermittently on the LCD screen. “A”
means faults resulted from blockages and requires manual intervention; “F” represents automatically remedied faults. The
fault codes disappear automatically after the remedy of the faults.
Fault Code Fault description Type
A01 Electric leakages Blockage
A03 Temperature limiter (decoupled mechanic temperature limiter) Blockage
A06 Temperature in the heating unit above 90°C Blockage
A08
Heating sensor or domestic hot water sensor disconnected from the ow pipe (normally, after a
5-minute heating order, the temperature increases on the ow pipe sensor and on the domestic
hot water sensor do not exceed 3°C. No temperatures above 40°C are detected).
Blockage
F10 Faulted heating temperature sensor (faulted NTC sensor, short circuited cables, unconnected
cables, or interrupted cables).
Reset after fault remedy
F13 Outdoor temperature sensor faulted (faulted NTC sensor,
short circuited cables, unconnected cables, or interrupted cables).
Reset after fault remedy
F14 Faulty temperature sensor for the water inside the domestic hot water (DHW) tank (faulted NTC
sensor, short-circuited cables, unconnected cables, or interrupted cables).
Reset after fault remedy
F37 The water pressure inside the installation is not correct
(pressure too low, water pressure switch not connected or defective)
Reset after fault remedy
F41
System out of operation (in case of a temperature gradient higher than the reference value).
Make sure that there is circulation in the heat exchanger; check the open position of the valves,
check the circulating pump operation). In such a case, the fault can be automatically remedied
after the temperature gradient become ≤5°C.
Reset after fault remedy
1.6 Functions
A: Hour and heating program intervals setting:
During normal operation, keep the heating activation program key pressed for 3 seconds in order to activate the hour setting,
starting with the setting of the hour. Turn the heating button to change the parameters. Shortly press the set key once to store the
hour setting data and continue with the minutes setting. Turn the heating button to change the parameters. Shortly press the set
key once to store the minutes setting data. If the heating unit is in the summer mode, you can activate the setting of the heating
program intervals. Turn the heating button through the points of the heating program intervals. Shortly press once the set key to
activate/deactivate the selected point of the heating program interval. After nishing the setting, press the OK key to exit and store
the performed changes. If you do not want to store the performed changes, shortly press the reset key to exit the menu.
B: Domestic hot water (DHW) tank key use:
The DHW tank key can be used if the tank is connected (P05 from the menu is set in the Stopped mode). If the DHW tank is not
allocated for other purposes, the key has no function.
C: Temperature setting and control:
1. Heating temperature set interval: 30-80°C The temperature drop that lets the boiler restart after shut off when the supply be-
came higher than the set point: 5-20°C
2. Temperature set interval inside the DHW tank 30- 60°C. The temperature drop that lets the boiler restart after shut off when the
supply became higher than the set point : 5-20°C.
3. Heating temperature to start: Tw<Ts-ΔT
*Note: Tw=working temperature; Ts=set temperature; ΔT=The temperature drop that lets the boiler restart after shut off
when the supply became higher than the set point.
D: Frost protection function:
Class I frost protection: for temperatures 8°C, the water pump keeps operating until heating temperature reaches ≥ 10°C, and
in such conditions the frost protection function becomes active and the FD message is displayed on the screen, while the anti-
freeze function is active, when the unit is in the OFF mode.
Class II frost protection: for temperatures 5°C, the water pump is activated and the resistances coupled to start heating. The re-
sistances are decoupled in the case of temperatures ≥30 °C, and the pump will keep operating for a short period of time. During
the unit’s frost protection function activation, the screen displays the temperature, if the unit is in the OFF mode.
E: Outdoor temperature compensation
Follow the operation 1.7 and enter PO7 menu, choose a curve by the heated rotary knob. When set the curve, it shows C (C--,
C01-C10) in the rst digit. C-- means close the outdoor temperature compensation function. The boiler will operate automatically
according to the target temperature which set by the users with the rotary knob. C01-C10 means to adjust the target water tem-
perature by the means of curve 1 to 10.

8EN Rev. 00 - 11/2018
LEB - TS
Please refer to g. 3 for the compensation curve.
1
2 And then follow the operation 1.7 and enter to P06 menu, adjust the offset by the domestic heated rotary knob.
3 When set the offset, it shows O in the rst digit (setting range is 030-050). 030-050 means to operate with relative offset
data base on the current curve.
4 Compensation curve








   

 







g. 3 -








   





 








   







 
g. 4 -
1 After nishing the setting, press the OK key to exit and store the performed changes. In the case in which you do not want
to store the performed changes, shortly press the reset key to leave the menu.
2 After start the outdoor temperature compensation function, if detect there’s faults on the outdoor temperature probe, it
will show the fault code (F13) every 10 seconds. Under this situation, the system will not operate according to the pre-set
outdoor temperature compensation curve, and the heated water target temperature will be acquiesced in 60 C. Under this
situation, user can adjust the water target temperature by means of adjusting the rotary knob.
1.7 Menu
1 In the status without settings and faults, keep the reset key pressed for 10 seconds to access the menu.
2 By the heated rotary knob, can skim through the”TS”, “HI” and ”RE” menu.
3 Details explain as below:
4 “TS” means adjustable menu.
5 “HI” means recall menu.
6 “RE” means reset menu.
7 Press the set button to step into relevant menu.
8 “TS” means adjustable menù
CODE Parameter specication Adjustable range System windows default
P01 Time set for water circulating pump 1 - 20 (min) 20 (min)
P02 The radiator heating temperature drop that lets the boiler restart
after shut off when the supply became higher than the set point 5 — 20°c 15
P03 The underoor heating temperature drop that lets the boiler restart
after shut off when the supply became higher than the set point 5 — 20°c 08
P04 The tank temperature drop that lets the boiler restart after shut off
when the supply became higher than the set point s - 10°c 05
P05 Tank connect / disconnect settings ON/ OFF OFF

9
EN
Rev. 00 - 11/2018
LEB - TS
CODE Parameter specication Adjustable range System windows default
P06 Compensation value of temperature for outdoor heating control 030 - 050°C 030
P07 Compensation curve of temperature for outdoor heating control C--/C10 C--
P08 Number of heating elements
3 groups heating elements
6 groups heating elements
9 groups heating elements
12 groups heating elements
Only reading
P09 Fault detection option of A08 00: OFF
03: ON 00
P10 Comfortable mode in CH mode ON/ OFF OFF
P11 Air release in CH return pipe ON/ OFF OFF
P12 Goal temperature when water tank sterilization 55-70°C 65°c
P13 Water tank sterilization period 1-31 days 7 days
9 Setting method:
10 Choose page table by spinning the rotary knob, then enter by quickly clicking the setting button, then can spin the heated
rotary knob to modify the parameter, by quickly clicking the setting button to quit back to main menu. After nish setting,
push “ok” to save the settings. But if don’t want to save, by quickly clicking the “reset key” twice to quit.
11
12 “HI” means recall menu.
13 The PCB can memory the last 10 faults: recall data H1: shows the current happened faults; recall data H10: shows the
faults happened when longest time from now; By s quickly clicking the setting button to glide the fault chart, if want to show
the relevant data just need to spin the domestic hot water rotary knob. If no record for the fault, it shows “no”. If want get
back to main menu, just need to push the “reset key”, by quickly clicking the “reset key” twice to quit toservice menu. Not
all errors are stored in memory; consecutive equal errors are stored as oneerror.
14
15 “RE” means reset menu.
16 Spin the heated rotary knob to switchover between “CLR” and “RES.
17 “CLR” means cancel the menu. If quickly clicking push the setting button, this operation will cancel all the fault records.
18 “RES” means reset menu. If quickly clicking push the setting button, this operation can recover all setting items in “tS”
menu to acquiescent data.
19 Turn the heating button to select the desired parameter and access it by shortly pressing the set key. The parameter’s
value change is performed by means of the heating potentiometer. After the parameter’s value is changed, press the set
key to return to the main menu. After nishing the setting, press the OK key to exit and store the performed changes. In
the case in which you do not want to store the performed changes, shortly press the reset key to leave the menu.
1.8 Filling of the installation
1 The electric heating unit is provided with a ball valve to ll the heating installation up to 1-3 bars. During operation, in case
the pressure decreases in the system (because the air is removed from the system) to the minimum value of the above
mentioned pressure, open the ll valve to supplement with water. Turn the ll valve anticlockwise to supplement with water
and clockwise to close it. The electric heating unit operates usually at 1-3 bars. After lling, close the ll valve (A - g. 5).
g. 5 -

10 EN Rev. 00 - 11/2018
LEB - TS
2 MOUNTING
2.1 0perating Condition and mounting location
1 To connect the electric heating unit to the local power supply system, please obtain the approval from the competent
authority.
2 Users are obliged to obtain the approval for short-term use of high power devices and to pay the thermal-power related
tariffs.
3 To use a new system of central heating or to modify the existing central heating system, it is recommended that you should
use the services of specialized design personnel. Installation by authorized plumber is compulsory to obtain the supplier’s
guarantee. As a result, please contact our partners for the heating unit’s mounting. They will offer assistance to you for the
electric heating unit’s use and operation.
4 The connection to the public power supply system and to any other electric installations is performed by specialized per-
sonnel in accordance with the rules and regulations in force.
5 The LEB - TS electric heating unit was designed to be permanently connected to the public power supply system.
6 Mount the LEB - TS electric heating unit in a position which is easily accessible for maintenance and inspection. Place the
unit in relation to other objects keeping minimum distances as indicated in .
7 The heating unit’s mounting should be performed solely by specialized and authorized technical personnel.
8 The guarantee certicate for the electric heating unit becomes valid after the unit’s commissioning by specialized person-
nel.
9 The unit’s temperature adjustments may be done by
unqualied persons. Such persons may operate the
control system following the instructions provided by
this manual or supplied by the service company. Do not
demount the electric system without permission during
maintenance works.
10 In order to mount the electric heating unit, the water’s
chemical
11 regime should be respected.
12 The installation will be provided with sealing and di-
scharge valves, and the safety valve will be connected
to the sewerage system.
13 The electric heating unit is designed for the AAS/ABS
typical environment as accepted by the standards STN
330300 and STN 33 2310 (These stands only for Slo-
vakia) (for example, the temperature interval is +5°C
- +40°C, the humidity varies with the temperature, but
should not exceed 85%). Do not mount the unit nor
in Zones 0,1 and 2 as dended by the standard STN
332135-1 and neither in rooms with bath tubes. In
bathrooms, in laundry spaces, or in rooms with show-
ers, or in any other area in which the unit 20 c might
get splashed with water.The unit’smounting in Zone 3 is
permitted. Installation in zone 3 is allowed if water jets
are not likely to be used there.
g. 6 -
A3 cm 15 cm
B10 cm 30 cm
C10 cm 20 cm
D1.5 cm (measured from the housing with opening) >25 cm
1

11
EN
Rev. 00 - 11/2018
LEB - TS
2 Protect the electric heating unit against accidental hits in accordance with the standard which species the allowed
mounting place.
g. 7 -
2.2 Mounting the heating unit
1 Fix the electric heating unit to the wall by means of xing
screws, according to g. 8. Suspend the unit’s body and
its auxiliary components on tightlyxed screws. The
unit’s housing is xed with screws to the posterior wall
and can be disassembled. Before mounting, establish a
proper place to perform repairs to the unit. In the case in
which the unit is connected to an open system, provide
a minimum pressure of 1 bar in the heating system.
2 The boiler should always be installed on a closed wall
before supply power is connected!
3 Near the boiler an all-pole disconnection switch (with
isolating distance between contacts to be not less than
3 mm in the open position) must be tted into the power
supply circuit.
g. 8 -

12 EN Rev. 00 - 11/2018
LEB - TS
2.3 Water pipes connection
1 A. Water pipes mounting
2 Before mounting, remove all the residues and impurities from inside the water pipes so as to ensure the normal operation
of the electric heating unit.
3 Assemble in the order indicated in Subchapter 4.1.
4 Connect the drain tube of the safety valve to the oor discharge tube or to the sewerage pipe to avoid water discharge on
the oor in case overpressure arises in the heating system. Otherwise, the unit’s supplier undertakes no responsibility for
inundations produced as a result of the valve’s operation.
5 In the case of a heating system provided with thermostat valves, the water circulation may be completely interrupted. In
such a case, a by-pass will be mounted. The by-pass should have an adjustable differential or should be correlated with
the circulating pump’s operation stages.
6 B. Water quality in the hydraulic system
7 In the case of water with a hardness above 25°Fr, use demineralized water to avoid the formation of deposits inside the
electric heating unit as a result of hard and corrosive water. It was found that even deposits with thicknesses of only a few
millimetres may lead to decreased efciency of the heat exchange, and, as a consequence, the unit’s overheating thus
causing serious problems.(25°Fr=14°dH)
8 In the case of a large system (large water content) or of a frequently fed system, water treatment is compulsory. In case
partial or complete system’s discharge is needed, use only properly treated water.
9 C. Frost protection system, heat carrier, additive and anti-frost inhibitor
10 The electric heating unit is provided with frost protection function. If the water temperature inside the heating system de-
creases below 5°C, the antifreeze mode is activated.
11 If the electric heating un is no longer connected to the power supply system, the frost protection function is annulled .
12 If necessary , you may use a heat carrier, an additive or an anti-frost inhibitor. However, the provider of such agents should
guarantee that such products do not impair the heat exchanger, the auxiliary components and the heating devices of the
electric heating unit. Do not use heat carriers, additives or anti-frost inhibitors which are not indicated as compatible with
the heating devices and with the electric heating unit.
13 Check and clean the lter and the collection device on a regular basis. Before lling the heating system
with water, check the pressure inside the expansion vessel. Restore the expansion vessel’s air cushion
to 0.9-1 bar, if necessary.
2.4 Performance of the electric connections Electric cable connection
1 To connect the unit to the power supply system, the user should have obtained the approval from the area’s electricity
supply company and check the unit’s connection characteristics which should be the same as the specications mentio-
ned within the connection approval. The installed electric power capacity should not exceed the value provided within the
authorization. The connection to the public power supply system and to any other electric installations is performed by
specialized personnel in accordance with the rules and regulations in force.
2 Before installing the unit, you should have a supply electric cable installed and provided with a main switch and an over-
load circuit breaker, inspect the said cable and have an approval to connect the new consumer.
3 The electric heating units are included in the category of devices permanently connected to the power supply source . The
unit’s xed supply cable should be provided with an integrated main switch. The unit is connected through proper cables
to the connection strip .
4 Before mounting the protection bolts, clean both sides and exterior walls of the housing as well as all the areas close to
the bolts through their metallic surface. Inside the housing, under the bolt heads, insulate the conductors using terminal
sleeves for cables. Tighten the connection inside by means of a copper nut provided with locking washer. Use another
such nut to connect the second protection cable.
5 When connecting the power supply cable, make sure that all the nuts of the electric terminals and contacts are properly
tightened.
6 You may buy simple and complex control components, such as the inside programmable (daily or weekly) controller, from
the LEB - TS electric heating unit’s supplier or from its partners. To ensure the proper operation of the LEB - TS electric
heating unit, it is compulsory to install an outlet voltage controller if the supply power is not guarantied within certain limits.
The needed controller is provided
7 with an outlet contact with 230/0.1 charging capacity. The electric distribution board that the boiler is connected to should
always contains a residual-current circuit breaker.

13
EN
Rev. 00 - 11/2018
LEB - TS
When connecting the power supply
cable, select the correct wiring type,
depending on the type of supply
Insert the power supply cable through the nylon joint from the boiler’s base. Loosen the joint’s nut
and tighten it again after inserting the power supply cable.
1 - Three phase supply wiring 2 - Single phase supply wiring
9 Connection of the room temperature controller, of the 3-way valve and of the DHW tank’s NTC temperature sensor
10 Note:
11 Maintain clean the room temperature controller’s contacts (the ambient thermostat will be of the on/off type).
12 - The connection of the room thermostat should be made through a 2-wire cable, with a recommended cross section
between 0.5 and 1.5 mm2 and a maximum length of 25 m.
13 - The cable for the room thermostat should not touch the power supply cable or any other electrical device. There should
be a minimum distance of 10mm between these elements.
14 Before using connected peripheral devices, the personnel responsable with the units mounting and in-
stallation should check the compliance of the respective devices with the unit. Take into consideration the
unit’s functions in relation to the user or his/her residence, as well as to the mentioned peripheral devices.
The supplier undertakes no responsibility for complaints resulted from the unit’s improper assembly and
mounting.
g. 9 -
1 1. Terminal for cables for the 3-way source.
2 2. Terminal for the NTC boiler sensor.
3 3. Terminal for the room temperature controller.
4 4. Terminal for the outdoor temperature controller.

14 EN Rev. 00 - 11/2018
LEB - TS
3 SERVICE AND REPAIRS
3.1 Commissioning
1 The commissioning should be performed only by qualied personnel.
2 The commissioning is necessary any time the system’s and safety devices repairs are performed.
3
4 Before starting the electric heating unit
5 Open all the closing valves connecting the unit to the system.
6 Fill the system with water and check if the electric heating unit and the system were properly vented and the venting device
closed automatically.
7 Check if there are any leakages at the heating system, at the hot water system, at the electric heating unit’s connections.
8 Check if the electric heating unit is connected to a proper source. Check if the unit’s earthing is correctly performed.
9 Check if there are liquids or corrosive objects in the electric heating unit’s vicinity
10 Starting the heating unit
11 Start the unit.
12 Finish the settings in the winter mode and make sure that the contact with the room thermostat is closed. Now, the heating
element of the heat exchanger heats up. The electric heating unit starts in automatic mode being controlled by the safety
devices.
13 The heating element can stop the operation when the power supply is interrupted. The electric heating unit will
resume heating when the power supply is resumed.
14 Operation check
15 Check if there is proper circulation between the electric heating unitand theheating system. Check if the electric heating
unit operates properly by opening and closing the room temperature controller or the timer.
16 Stop
17 Keep the key pressed for 5 seconds.
18 During the closing of the electric heating unit, the circuit board remains on.
19 With the heating function inactive, themessage OFF appears on the LCD screen. However, the frost protection function
remains active.
20 When the electric heating system is disconnected from the power supply system, the frost protection function is not active.
21 To avoid frost-caused losses following the unit’s long disconnection from the power supply system, the complete drain of
the heating system and its lling with antifreeze agent in accordance with the requirements included in Subchapter 2.3.
are recommended.
3.2 Maintenance
1 The regular maintenance operations help avoid any possible faults.
2 A full inspection once a year, before putting into operation the heating system, is recommended.
3 Do not demount the housing. The user can wash the housing’s surface, using detergents, can control the operation modes
and can supplement the system with heat carrier after the water pressure is checked, depending on the value showed by
the thermo manometer.
4 While checking, tighten all the electric joints and water connections, clean the water pump, the Y lter, check the safety
valve, the discharge valve, as well as all the safety devices. Then check if the unit operates properly.
5 When the unit operates in a closed heating system with an expansion vessel under pressure, check frequently the value
indicated by the pressure gauge. In the cooling stage, with a decrease of the residual pressure below the limit established
by the company responsible for installation, the unit’s check by specialized personnel is necessary. This is not applicable
in the case of the rst heating or when the safety valve opens. In such cases, ll the system with water following the in-
structions.
6 Cleaning the appliance case: Use a damp, soft cloth to clean the outer painted metal case of the appliance, do not use
chemicals or abrasive materials.
3.3 Repairs
1 The following operations must be performed solely by the competent personnel, such as the local distri-
butor or the service provider.
2 The appliance must be serviced regularly by a competent, qualied person.
3 Only a competent engineer can remove the appliance case and carry out any work.
4 Electric eating unit seasonal checks
5 The following checks to the electric heating unit are recommended at least once a year:

15
EN
Rev. 00 - 11/2018
LEB - TS
• The control system and the protection system (three phase fuse, electric connections tightening, temperature sen-
sors and safety elements etc.) should work properly.
• Check and clean the heating elements of any limestone deposits.
• When cold, the pressure inside the installation should be 1 bar. Otherwise, adjust the reference value.
• Check and restore the expansion vessel’s air cushion, if needed; the pressure should be 0.9-1 bar.
• Check the proper operation of the circulating pump.
• Check the wiring’s and connection strip’s integrity; they should not have damages due to heating.
3.4 Faults remedy
1 Diagnosis
2 The electric heating unit is tted with an advanced self-diagnosis system which displays the faults codes in case of bre-
akdown on the LCD screen.
3 Certain faults (code “A”) may lead to the unit’s shutdown. To resume operation, press the reset key for a second.
4 In case of shutdown due to other faults (code “F”), the electric heating unit can automatically resume its operation when
the parameters which caused the fault returned to normal.
5 The table below shows some fault causes, as well as certain solutions for the users.
6 In the case of a repeating fault which you cannot remedy, please contact the FERROLI service personnel.
Symptoms Code Possible causes Solutions
No heating
A01
Electric leakages (deciencies in the power
supply)
Check if the unit is connected to the power supply
system and if the three
phase fuse is coupled. Ask the authorized personnel to
perform this check
Temperature limiter ei-
ther faulty or operated A03
Heating terrperature lirriter faulted Check if the heating temperature limiter is correctly
mounted and actuated
The is no circulation in the system Check the circulating pump to see if there is circulation
in the heating system
The is air in the system.
Temperature in the
unit is above 90°C A06
The water in the heating system is not
recirculated
Check the recirculating pump to see if there is circula-
tion in the heating system
There is air in the heating system.
Disconnected tempe-
rature sensor A08
The heating temperature sensor is not xed
or is faulty (normally, subsequently to a 10-
minute heating, the temperature increases
on the temperature sensor and on the dome-
stic hot water sensor do not exceed 3°C
Temperatures above 40°C are not detected)
Check if the heating temperature sensor is properly
connected to the pipe
Faulty heating terrpe-
rature sensor F10
Faulty heating terrperature sensor, such
as open circuit, short-circuit, or unxed or
interrupted cables
Check the cables or replace the temperature sensor
Faulty outdoor tempe-
rature sensor F13
Faulty outdoor temperature sensor, for
reasons such as open circuit, short-circuit, or
improperly xed or interrupted cables.
Check the cables or replace the temperature sensor
Faulty doerrstic hot
water (DHW) tank
terrperature sensor
F14
Faulty NTC DHW sensor, for reasons such
as open circuit, short-circuit, or improperly
xed or interupted cables
Check the cables or replace the temperature sensor
Faulty water pressure
switch F37
Not enough water pressure in the installa-
tion.
The water pressure switch has open or faulty
contacts
Fill the system with water
Check the water pressure switch and, if need ed,
replace
Lack of circulation in
the system F41
Clogged heating circuit Check the open position of the valves.
Faulty operation of the circulating pump Check the Y lter
Check the circulating pump

16 EN Rev. 00 - 11/2018
LEB - TS
4 TECHNICAL CHARACTERISTICS AND PARAMETERS
4.1 Dimensions and joints
g. 10 -
1 Legend
1 Heating system ow pipe G3/4
2 Water lling valve G1/2
3 Heating system return pipe G3/4
4 Power cable inlet
5 3-way valve power cable inlet
2

17
EN
Rev. 00 - 11/2018
LEB - TS
4.2 Heating unit’s general drawing and main components
1 Legend 6-9kw
2
1 Safety thermostat 100°C
2 Expansion vessel
3 Unit’s ow pipe
4 Expansion vessel’s connection pipe
5 Heating drain joint
6 Heating water outlet
7 Bypass pipe
8 Contactor
9 Terminal block
10 Water inlet
11 Water lling valve
12 Heating water return inlet 13 Pump
14 Safety valve
15 Automatic venting valve
16 Hydraulic pressure switch
17 Heating return pipe
18 Inner chamber
19 Inner tank
20 Heating element
21 Automatic venting valve for the inner tank
22 Temperature sensor for the inner tank
g. 11 -
1 Legend 12-28kw
2
1 Safety thermostat 100°c
2 Expansion vessel
3 Unit’s ow pipe
4 Expansion vessel’s connection pipe
5 Heating drain joint
6 Heating water outlet
7 Bypass pipe
8 Terminal block
9 Contactor 10 Water inlet
11 Water lling valve
12 Heating water return inlet
13 Pump
14 Safety valve
15 Automatic venting valve
16 Hydraulic pressureswitch
17 Heating returnpipe
18 Inner chamber
19 Inner tank
20 Temperature sensor for theinner tank
21 Heating element
22 Automatic venting valve for the inner tank
g. 12 -

18 EN Rev. 00 - 11/2018
LEB - TS
4.3 Hydraulic scheme
1 Legend
2
1 Expansion vessel
2 By-pass
4 Heating water outlet
5 Water inlet
6 Heating return pipe
7 Filling valve
8 Direction valve
9 Pump
10 Safety valve
11 Water pressure switch
12 Inner chamber
13 Temperature limiter100°C
g. 13 -
4.4 Circulating pump diagram
g. 14 -
1 - 2 - 3 = Wide range of hydraulic systems
H = Head
Q = Flow

19
EN
Rev. 00 - 11/2018
LEB - TS
4.5 Technical parameters
Single phase power supply V 220-240V~/50Hz
Three phase power supply V 400V 3N~/50Hz
Peak current intensity A 41
Absorbed electrical power kW 6,7.5 , 9
Output % 99.5
Peak heat carrier temperature °C 80
Circulating pump capacity, max. bar 0.5
Expansion vessel volume L10
Expansion vessel volume bar 0.8
Maximum working pressure bar 3
Recommended working pressure bar 1 - 1.7
Electrical protection class IP 20
Unit ow pipe/return pipe connection G 3/4"
Water ll/discharge connection G 1/2"
Dimensions: H x L x D mm 740 X 440 X 265
Weight (without water) Kg 29
1 Recommended sections for circuit breakers and conductors
Unit power
(kW)
Heating elements num-
ber and power
Peak current intensity
through phase I (A)
Minimum power supply cable section copper (mm2)
Single phase Three phase
line
Three phase
null
66 elements of 1kw 28 4 1,5 2,5
7,5 6 elements of 1.25kw 34 6 1,5 4
96 elements of 1.5kw 41 10 2,5 6,6
2
Three phase power supply V 400V 3N~/50Hz
Peak current intensity A 44
Absorbed electrical power kW 12. 15. 18. 21. 24. 28
Output % 99.5
Peak heat carrier temperature °C 80
Circulating pump capacity, max. bar 0.5
Expansion vessel volume L10
Expansion vessel volume bar 0.8
Maximum working pressure bar 3
Recommended working pressure bar 1 - 1.7
Electrical protection class IP 20
Unit ow pipe/return pipe connection G 3/4"
Water ll/discharge connection G 1/2"
Dimensions: H x L x D mm 740 X 440 X 340
Weight (without water) Kg 40
3 Recommended sections for circuit breakers and conductors
Unit power
(kW)
Heating elements num-
ber and power
Peak current intensity
through phase I (A)
Minimum power supply cable section copper (mm2)
Three phase
line
Three phase
null
12 12 elements of 1kw 18,2 2.5 2.5
15 12 elements of 1.25kw 22,8 2.5 2.5
18 12 elements of 1.5kw 27,3 4 4
21 12 elements of 1.75kw 31,9 4 4
24 12 elements of 2kw 36,4 66,6
28 12 elements of 2.33kw 44 6 6,6

20 EN Rev. 00 - 11/2018
LEB - TS
4 Erp data
Parameter Simbol Unitat 6kW 7.5kW 9kW
Seasonal space heating energy efciency class DDD
Rated heat output Pn kW 6 7 9
Seasonal space heating energy efciency ƞs% 36 36 36
Useful heat output
Useful heat output at rated heat output and high-temperature regime(*) P4 kW 5,9 7,4 8,9
Useful heat output at 30% of rated heat output andlow- temperature regime(**) P1 kW 0,0 0,0 0,0
Useful efciency
Useful efciency at rated heat output and high-temperature regime(*) ƞ4%39,5 39,6 39,6
Useful efciency at 30% of rated heat output and low- temperature regime(**) ƞ1%0,0 0,0 0,0
Auxiliary electricity consumption
At full load elmax kW 6,000 7,500 9,000
At part load elmin kW 0,000 0,000 0,000
In standby mode PSB kW 0,001 0,001 0,001
Other items
Standby heat loss Pstby kW 0,072 0,072 0,072
Ignition burner power consumption Pign kW 0,000 0,000 0,000
Annual energy consumption QHE GJ 47 59 71
Sound power level LWA dB 31 32 34
Emissions of nitrogen oxides Nox mg/kW 0 0 0
Parameter Simbol Unitat 12kW 15kW 18kW 21kW 24kW 28kW
Seasonal space heating energy efciency class D D D D D D
Rated heat output Pn kW 12 15 18 21 24 28
Seasonal space heating energy efciency ƞs% 36 36 36 36 36 36
Useful heat output
Useful heat output at rated heat output and high-
temperature regime(*)
P4 kW 11,9 14,9 17,9 20,9 23,9 27,9
Useful heat output at 30% of rated heat output and
low- temperature regime(**)
P1 kW 0,0 0,0 0,0 0,0 0,0 0,0
Useful efciency
Useful efciency at rated heat output and high-tem-
perature regime(*)
ƞ4%39,6 39,7 39,6 39,8 39,8 39,8
Useful efciency at 30% of rated heat output and
low- temperature regime(**)
ƞ1%0,0 0,0 0,0 0,0 0,0 0,0
Auxiliary electricity consumption
At full load elmax kW 12,000 15,000 18,000 21,000 24,000 28,000
At part load elmin kW 0,000 0,000 0,000 0,000 0,000 0,000
In standby mode PSB kW 0,001 0,001 0,001 0,001 0,001 0,001
Other items
Standby heat loss Pstby kW 0,090 0,090 0,090 0,090 0,090 0,090
Ignition burner power consumption Pign kW 0,000 0,000 0,000 0,000 0,000 0,000
Annual energy consumption QHE GJ 95 119 142 166 189 221
Sound power level LWA dB
Emissions of nitrogen oxides Nox mg/kW 36 37 38 39 40 41
5 (*) High temperature regime means a return temperature of 60°C entering the heating system and a supply temperature
of 80°C Lock-heating system
6
7 (**)The low temperature means a return temperature for condensing boilers 30°C, 37°C for low temperature boilers and
50°C other instalatli heating (at the entrance to the heating system)