Ferroli LEB 28.0-TS Operating manual

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28.0
WALL MOUNTED ELECTRIC BOILER
BEDIENUNGS- UND INSTALLATIONSHANDBUCH
WANDMONTIERTES ELEKTROHEIZAGGREGAT
USER AND INSTALLATION MANUAL
Code:433606850

Dear Customer,
Thank you for choosing the wall-mounted electric boiler (heating unit) intended to be used
in the heating system and designed to provide comfort.
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.
We hope that the LEB TS electric heating unit will create an environment in which you will
enjoy thermal comfort.
Please observe the following warnings and recommendations:
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 specifications.
2. Mount the heating unit in the specified conditions in order to make sure that all the
protection and operating devices work well for their intended purpose.
3. Make sure that the heating unit is commissioned by the supplier or by the supplier's
authorized personnel.
4. For the heating unit commissioning as well as in the event of failures, please contact
the specialized personnel as indicated by the supplier. Any intervention by unauthorized
personnel may lead to the heating unit breakdown (and possible failures of the auxiliary
devices).
5. Check the accessories integrity.
6. Check the delivered models to make sure that they are what you ordered.
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.
8. Please do not remove or destroy the stickers and the identification plates attached to
the heating unit.
9. The heating unit complies with the following standards: EN 60335-2-35: 2002, EN
60335-1: 2002 + A1:2004+A2:2006+A13:2008.
10.At the end of the service life, please recycle the heating unit and its accessories in
compliance with the legislation in force.
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Content
1. User instructions.......................................................................................1
1.1. Introduction ......................................................................................1
1.2. Safety of goods and persons ...........................................................1
1.3. Control panel ...................................................................................2
1.4. Keys functions .................................................................................3
1.5. Faults remedy ..................................................................................4
1.6. Functions..........................................................................................4
1.7. Menu.................................................................................................6
1.8. Filling of the installation ...................................................................7
2. Mounting ..................................................................................................8
2.1. Operating conditions and mounting location ....................................8
2.2. Mounting the heating unit ................................................................9
2.3. Water pipes connection ...................................................................10
A. Water pipes mounting .........................................................................10
B. Water quality in the hydraulic system .................................................10
C. Frost protection system, heat carrier, additive and anti-frost inhibitor 10
2.4. Performance of the electric connections ..........................................10
Power supply cable connection...............................................................10
Connection of the temperature controller for the rooms, of the 3-way valve
and of the NTC domestic hot water (DHW) tank temperature ................10
3. Service and repairs .................................................................................12
3.1. Commissioning ................................................................................12
Before starting the heating unit................................................................12
Starting the heating unit...........................................................................12
Operation check.......................................................................................12
Shut-down................................................................................................12
3.2. Maintenance ....................................................................................12
3.3. Repairs ............................................................................................13
Heating unit seasonal checks..................................................................13
3.4. Faults remedy ..................................................................................13
Diagnosis.................................................................................................13
4. Technical characteristics and parameters.................................................14
4.1. Dimensions and connections ...........................................................14
4.2. Heating unit general drawing and main components........................15
4.3. Hydraulic scheme ............................................................................16
4.4. Circulating pump diagram ................................................................17
4.5. Technical parameters........................................................................18
Recommended sections for circuit breakers and conductors..................18
4.6. .......................................................19Controller board wiring diagram
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4.7. ............................. ...............................20Boiler wiring diagram ............

1. USER INSTRUCTIONS
1.1. Introduction
In order to follow the development trends in the field, Ferroli decided to launch the
LEB TS series direct heating electric units with capacities of 12kW, 15kW, 18kW,
21kW,24kW and 28kW This is a highly efficient 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
1.2. Safety of goods and persons
Make sure and check if the heating unit operates according to its intended purpose
by implementing the ISO9001 quality management system.
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
influence of drugs and alcohol, of all persons without discernment etc.
The supplier provides the products in compliance with the corresponding
regulations and standards, as well as the products from the series as per the
ISO9001 quality management system.
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 guarantee period).
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control panel.

1.3. Control panel
Display
1. LCD screen
The control panel has 8 keys, 1 screen and 2 buttons.
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12 13 14 15 16 17
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Fig.1
S/N Description
Indicator for heating programming in winter mode.
Indicator 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.
Time intervals for the heating programming. By setting a time interval, it is possible to
tart and stop some indicators for the respective individual time interval. If the indicators
start, there is a heating request. Otherwise, no heating request for the respective interval
Current time indicator.
Outside temperature indicator. After installing the probe for outside temperature and
performing the configuration in the main panel, the indicator displays the probe's
temperature readings of the outside temperature.
Domestic hot water (DHW) indicator. It is permanently displayed in DHW tank configuration,
summer or winter, and blinks while setting a DHW target temperature.
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.
Domestic hot water (DHW)operating indicator. It blinks when the heating unit operates in
the DHW mode or when the target temperature for domestic hot water is set.
Heating functioning indicator. It blinks during heating or when the adjusted heating temperature is set.
Heating indicator. Displayed in “winter” mode.
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
temperature inside the tank.
Power indicator. It shows the current thermal power, totalizing 3 exchanges.
Circulating pump operation indicator. It is started when the pump operates.
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is recorded.

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2. Background light
The background light is off when the heating unit is off, and the background light is on when
the heating unit is on. The background light is automatically put off when no key is pressed for
20 minutes, and is put on when any key is pressed.
1.4. Keys functions
Heating
programming
Water tank
Floor
heating
Setting
Enter
Winter/summer
mode selection
Reset
On/Off
Radiators
temperature setting Domestic hot water temperature setting
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 floor heating key to switch between radiator and floor heating when the electric
heating unit is in the heating mode.
When the floor heating mode is activated, you can set a temperature of up to 60ºC for the
heating water (allowed variation interval is 30-60ºC). After heating, the temperature value may
vary by 8ºC.
When the floor heating mode is deactivated, you can set a temperature of up to 80ºC for the
hot water (allowed variation interval is 30-80ºC).
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 modes.
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.
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Winter mode indicator. It is started when the boiler is set in the winter mode.
Summer mode indicator. It is started when the boiler is set in the summer mode.
Floor heating indicator. It is started when the floor heating mode is selected.
Usually it is off.
Dometic hot water (DHW) tank connection indicator. It is on when the system uses a DHW tank.
Fig.2
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H:
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 protection 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 flash intermittently. To exit the setting status, press the reset key.
H:
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 protection 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 flash intermittently. To exit the setting status, press the reset key.
On/Off key:
1.5. Faults remedy
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.
A03
A06
A08
F10
F11
F14
F37
F41
Electric leakages
Temperature limiter (decoupled mechanic temperature limiter)
Heating sensor or domestic hot water sensor disconnected from the
flow pipe (normally, after a 10-minute heating order, the temperature
increases on the flow pipe sensor and on the domestic hot water
sensor do not exceed 3ºC. No temperatures above 40ºC are detected).
Faulted heating temperature sensor (faulted NTC sensor, short-
circuited cables, unconnected cables, or interrupted cables).
Sensor for temperature inside faulted heating unit (faulted NTC sensor,
short-circuited cables, unconnected cables, or interrupted cables).
Faulty temperature sensor for the water inside the domestic hot
water (DHW) tank (faulted NTC sensor, short-circuited cables,
unconnected cables, or interrupted cables).
The water pressure inside the installation is not correct (pressure
too low, water pressure switch not connected or defective).
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 Y filter
and the circulating pump operation). In such a case, the fault can be
automatically remedied after the temperature decreases below 5ºC.
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 finishing 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. 4
Fault code Fault description Type
A01
Temperature in the heating unit above 90ºC
Blockage
Blockage
Blockage
Blockage
Reset after fault remedy
Reset after fault remedy
Reset after fault remedy
Reset after fault remedy
Reset after fault remedy
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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: 30~80ºC. Temperature difference between the flow pipe and the return
pipe: 5~20ºC.
2. Temperature set interval inside the DHW tank 30~60ºC. Temperature difference between the flow pipe and
the return pipe: 5~20ºC.
3. Heating temperature to start: Tw<Ts-ΔT
* Note: Tw=working temperature; Ts=set temperature; ΔT=temperature difference between the flow pipe and the
return pipe.
D: Frost protection function:
Class I frost protection: for temperatures ≤8ºC, the water pump keeps operating until heating temperature reaches
≥10 ºC, 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 ≤5ºC, the water pump is activated and the resistances coupled to start
heating. The resistances are decoupled in the case of temperatures ≥30 ºC, 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 P07 menu, choose a curve by the heated rotary knob. When set the curve, it
shows C(C--, C01-C10) in the first 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 temperature by the means of curve 1 to 10. Please refer to Picture 3
for the compensation curve
Follow the operation 1.7 and enter to P06 menu, adjust the offset by the domestic heated rotary knob. When set
the offset, it shows O in the first digit (setting range is O30-O50). O30-O50 means to operate with relative offset
data base on the current curve.
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10
补偿曲线（偏移＝0）
Outdoor temperature
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3
2
1
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10 7654
3
2
1
8910
采
暖
目
标
温
度
Outdoor temperature Outdoor temperature
Compensation curve
Heated water target temperature
Compensation curve Compensation curve
Heated water target temperature Heated water target temperature
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P08 range: 02 to 12. Each sequence start and stop two groups, start-stop interval is 5 seco
-nds, start and stop order is: R01 & R07 → R02 & R08 → R03 & R09 → R04 & R10 →
R05 & R11 → R06 & R12.
1.7.Menu
In the status without settings and faults, keep the reset key pressed for 10 seconds to access the
menu.
By the heated rotary knob, can skim through the“TS”、“HI” and“RE”menu.
Details explain as below:
“TS”means adjustable menu.
“HI” means recall menu.
“RE”means reset menu.
Press the set button to step into relevant menu.
“Ts”means adjustable menu.
After finishing 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.
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 10S. 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.
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P01: To set the water pump operation period when the unit is stopped;
P02: To set the temperature difference between the flow pipe and the return pipe in the heating
mode;
P03: To set the temperature difference between the flow pipe and the return pipe in the floor
heating mode;
P04: To set the temperature difference between the flow pipe and the return pipe for the
domestic hot water (DHW) tank;
P05: To set the DHW tank's activation/deactivation.
P06: To set the domestic hot water offset.
P07: To set the heated temperature compensation
P08: To set the power adjustment (02- 12 team optional)
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P09: To set the function of A08 fault detection (00mean OFF/03mean ON)

Setting method:
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 finish setting, push “ok” to save the settings. But if don't
want to save, by quickly clicking the “reset key” twice to quit.
“HI” means recall menu.
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 to
service menu.
“RE”means reset menu.
Spin the heated rotary knob to switchover between “CLR”and“RES.
“CLR”means cancel the menu. If quickly clicking push the setting button, this operation will cancel
all the fault records.
“RES”means reset menu. If quickly clicking push the setting button, this operation can recover all
setting items in “tS” menu to acquiescent data.
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 finishing
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
The electric heating unit is provided with a ball valve to fill 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 fill valve to
supplement with water. Turn the fill valve anticlockwise to supplement with water and clockwise
to close it. The electric heating unit operates usually at 1-3 bars. After filling, close the fill valve.
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