Fiamma Elektra Compact Series Operating instructions

®
ELECTRIC COMBI WALL BOILER
FOR HEATING AND SANITARY HOT WATER PRODUCTION
INSTANTANEOUS WITH ACCUMULATION TANK
Combi ElektraCompact.. BP-L 016 series
USER AND MAINTENANCE MANUAL
EQUIPMENT CONFORM TO EC DIRECTIVE 2006/95 / EC. And built in compliance with IEC 60335-2-21:
2012 IEC 60335-1: 2010 EN 60335-2-21: 2003 + A1: 2005 + A2: 2008 - EN 60335-1: 2012 - EN 62233: 2008

2
ELECTRIC WALL BOILER
Series ELEKTRA Compact.. BP-L 016
Presentation
Thank you for choosing an electric wall boiler FIAMMA, built with the most modern
technologies, safe and tough materials, so as to ensure maximum efficiency of use,
total quality of the device and extreme safety for user. The series Elektra.. is built
according to European standards dir. machines 2006/42 - IEC 60335-1:2010 with
EN 60335-2-21:2003 +A1:2005+A2:2008 - EN 60335-1:2012 - EN 62233:2008.
The obtained results can be summarized in the following key points:
- noiseless functioning, thanks to maximum insulation of the device by means of
innovative special materials that ensures minimum heat loss.
- high degree of reliability, thanks to a careful choice of materials and to server tests
carried out during production for each unit built.
- high performance with maximum efficiency, thanks to a modulation of electric
power to the heating elements, according to the actual need of energy by the
system or the need of sanitary water. The system D.E.S. manages the device with
temperature probes positioned in each sensitive point of the boiler, so as to
manage both comfort and economy functioning, in order to reduce power
consumption when the device is not used at the maximum capacity or demand.
- the appliance is fully adjustable both in water temperature of the heating system
(with the possibility to choice of system at high and low temperature for the
underfloor systems) and in the domestic hot water temperature.
- The assembly of the components has been realized in order to allow an easy
access to them, all from the front of the unit, for ordinary and extraordinary
maintenance.
We recommend you to follow our instructions, and we suggest to contact the area
authorized service FIAMMA in order to prepare a planned maintenance contract
which can ensure suitable operation at maximum efficiency and safety, so that your
machine use can go a long way. In renewing our thanks, our technical department
and our sales network, are at your disposal for any further information.
FIAMMA GIRO s.r.l.
Company group
The company FIAMMA GIRO s.r.l. declines all responsibility for possible inaccuracies contained in this
pamphlet, if due to printing errors or inadvertent errors. However, reserves the right to make changes to its
products that it deems useful or necessary, without affecting the essential characteristics of the products
manufactured and marketed.

3
WARNINGS:
THIS EQUIPMENT MAY BE USED BY CHILDREN FROM 8 YEARS AND UP TO
PERSONS WITH CAPACITY PHYSICAL, SENSORY OR MENTAL
CAPABILITIES OR LACK OF EXPERIENCE AND KNOWLEDGE, A CONDITION
THAT SUPERVISION OR WHO WILL GET DIRECTIONS FOR USE IN THE
DEVICE SAFELY TO UNDERSTAND THE RISKS INVOLVED. CHILDREN
SHOULD NOT PLAY WITH THE APPLIANCE. CLEANING AND MAINTENANCE
SHOULD NOT BE MADE BY CHILDREN WITHOUT SUPERVISION.
FOR DIRECT CONNECTION TO THE MAINS, YOU MUST PROVIDE A DEVICE
THAT MAKE THE DISCONNECT THE NETWORK WITH A DISTANCE
CONTACT OPENING ALLOWING THE COMPLETE DISCONNECT THE
CONDITIONS OF OVERVOLTAGE CATEGORY III, UNDER THE RULES OF
INSTALLATION.
IF THE POWER CABLE IS DAMAGED, IT MUST BE REPLACED BY THE
MANUFACTURER OR THE TECHNICAL ASSISTANCE SERVICE OR
OTHERWISE BY A PERSON WITH SIMILAR QUALIFICATION IN ORDER TO
PREVENT ANY RISK.
WATER CAN DRIP FROM EXHAUST DEVICE AGAINST OVERPRESSURE AND
THE HOSE MUST BE LEFT OPEN THE ATMOSPHERE.
THE DEVICE AGAINST OVERPRESSURE SHALL BE OPERATED REGULARLY
TO REMOVE DEPOSITS OF LIMESTONE AND TO CHECK THAT ARE
BLOCKED.
THE EXHAUST PIPE CONNECTED TO THE DEVICE AGAINST
OVERPRESSURE MUST BE INSTALLED IN SLOPE AND CONTINUE DOWN IN
A PROTECTED BY ICE FORMATION.

4
DIMENSIONS
The series ElektraCompact.. BP-L 016has four power levels, but the same overall dimensions:
Elektra Compact 6 kW BP-L 016 6 kW maximumelectrical output
Elektra Compact 12 kW BP-L 016 12 kW maximumelectrical output
Elektra Compact 18 kW BP-L 016 18 kW maximumelectrical output
Elektra Compact 24 kW BP-L 016 24 kW maximumelectrical output
Appliance dimension: Packaging dimensions:
L (Width): 660 mm Width: 710 mm
H (Height): 875 mm Height: 940 mm
P (Depth): 300 mm Depth: 390 mm
Weight: 59 kg Weight: 62,5kg

5
Hydraulic connections - Dimensional of connection arrangement
M Heating delivery: ¾” M
R Heating return: ¾” M
AF Cold sanitary water inlet: ½” M
AC Hot sanitary water output: ½” M
VSR Heating safety valve (0,3 MPa - 3 bar): ½” F
VSS Sanitary safety valve (0,65 MPa - 6,5 bar): ½” F
The unit is expected to be connected in a continuous manner to the water mains without
the use of a set of junctions.
Bottom view (under the boiler)
(It must be removed by opening knock-out)

6
MAIN TECHNICAL FEATURES
Elektra Compact 6 kW BP-L 016 6kW maximum electrical output
Single-phase electrical supply: 230-240 V - 50 Hz.
Weight: 58 kg.
Capacity of tank 37 liters. Glass-lined steel with inspection flange and
magnesium anode.
Electrical / heat power available at heating of 6 kW obtained by n°.2
Resistance group (n°.2 da 3x1 kW).
Electrical power at hot water resistance of 2 kW (2.000 W).
Maximum head available at the pump of 7m.c.a.
Expansion vessel capacity of 8 liters.
Safety valve of heating circuit of 0,3 MPa (3 bar).
Safety valve of sanitary circuit of 0,65 MPa (6,5 bar).
Maximum heating operating pressure: 0,25 MPa (2,5 bar).
Maximum sanitary operating pressure: 0,55 MPa (5,5 bar).
Minimum operating pressure in the heating circuit: 0,06 MPa (0,6 bar).
Mini. operating pressure in the sanitary, comfort system: 0,025 MPa (0,25 bar).
Min. op rating pressure in the sanitary, economy system: 0,005 MPa (0,05 bar).
Maximum limit of thermal safety heating circuit - boiler body: 100°C.
Elektra Compact 12 kW BP-L 016 12 kW maximum electrical output
Single-phase electrical supply: 230-240 V - 50 Hz.
Weight: 59 kg.
Capacity of tank 37 liters. Glass-lined steel with inspection flange and
magnesium anode.
Electrical / heat power available at heating of 12 kW obtained by n°.2
Resistance group (n°.2 da 3x2 kW).
Electrical power at hot water resistance of 2 kW (2.000 W).
Maximum head available at the pump of 7m.c.a.
Expansion vessel capacity of 10 liters.
Safety valve of heating circuit of 0,3 MPa (3 bar).
Safety valve of sanitary circuit of 0,65 MPa (6,5 bar).
Maximum heating operating pressure: 0,25 MPa (2,5 bar).
Maximum sanitary operating pressure: 0,55 MPa (5,5 bar).
Minimum operating pressure in the heating circuit: 0,06 MPa (0,6 bar).
Mini. operating pressure in the sanitary, comfort system: 0,025 MPa (0,25 bar).
Min. op rating pressure in the sanitary, economy system: 0,005 MPa (0,05 bar).
Maximum limit of thermal safety heating circuit - boiler body: 100°C.

7
Elektra Compact 18 kW BP-L 01618 kWmaximum electrical output
Single-phase electrical supply: 230-240 V - 50 Hz.
Weight: 60kg.
Capacity of tank 37 liters. Glass-lined steel with inspection flange and
magnesium anode.
Electrical / heat power available at heating of 18 kW obtained by n°.3
Resistance group (n°.3 da 3x2 kW).
Electrical power at hot water resistance of 2 kW (2.000 W).
Maximum head available at the pump of 7m.c.a.
Expansion vessel capacity of 10 liters.
Safety valve of heating circuit of 0,3 MPa (3 bar).
Safety valve of sanitary circuit of 0,65 MPa (6,5 bar).
Maximum heating operating pressure: 0,25 MPa (2,5 bar).
Maximum sanitary operating pressure: 0,55 MPa (5,5 bar).
Minimum operating pressure in the heating circuit: 0,06 MPa (0,6 bar).
Mini. operating pressure in the sanitary, comfort system: 0,025 MPa (0,25 bar).
Min. op rating pressure in the sanitary, economy system: 0,005 MPa (0,05 bar).
Maximum limit of thermal safety heating circuit - boiler body: 100°C.
Elektra Compact 24 kW BP-L 01624 kWmaximum electrical output
Single-phase electrical supply: 230-240 V - 50 Hz.
Weight: 61kg.
Capacity of tank 37 liters. Glass-lined steel with inspection flange and
magnesium anode.
Electrical / heat power available at heating of 24 kW obtained by n°.4
Resistance group (n°.4 da 3x2 kW).
Electrical power at hot water resistance of 2 kW (2.000 W).
Maximum head available at the pump of 7m.c.a.
Expansion vessel capacity of 10 liters.
Safety valve of heating circuit of 0,3 MPa (3 bar).
Safety valve of sanitary circuit of 0,65 MPa (6,5 bar).
Maximum heating operating pressure: 0,25 MPa (2,5 bar).
Maximum sanitary operating pressure: 0,55 MPa (5,5 bar).
Minimum operating pressure in the heating circuit: 0,06 MPa (0,6 bar).
Mini. operating pressure in the sanitary, comfort system: 0,025 MPa (0,25 bar).
Min. op rating pressure in the sanitary, economy system: 0,005 MPa (0,05 bar).
Maximum limit of thermal safety heating circuit - boiler body: 100°C.

8
POSITIONING THE BOILER
The appliance must be installed exclusively on a vertical and solid wall that can
support the weight of the boiler through the support bracket placed supplied in
the box packaging.
The bracket must be fixed to the wall with five M8 screws with appropriate
anchors conform to the type of the wall itself (not in the boiler kit). The device
is attached at the top by bringing the folded portion of the bracket in the
chassis through the boiler behind the unit.

9
CONTROL PANEL
The control panel is composed of: display, function selection keys, general switch and the
hydrometer it si placed in the lower left corner in front of the unit (see image above).
Using analogical hydrometer
The analogical hydrometer control panel has a dial with unit of measure in a bar, by 0 to 6
bar. The water pressure in the heating system is indicated by the index of the black arrow.
The optimum pressure for the system is between 1 and 1,5 bar.
More then 1,5 bar you can have a maximum pressure of the 2 bar (maximum expansion of
the system during the rise in temperature). More than 2 bar pressure the system is not in
the range of operation, and the mechanical safety valve (preset to 3 bar) can start to lose
water (to access the valves remove the knockout openings at the valves, see page 2
hydraulic installation diagram).
The minimum op rating pressure is 0,8 bar (+/-0,2 bar). The differential positive or negative
tolerance is due to the operation of the water pressure switch with fixed setting..
hydrometer DisplayGeneral
switch

10
Keyboard panel (Control panel)
Meaning of the keys in user mode
Key Function
-H(J5)Display / Tank setpoint decrease
+H(J6)Display / Tank setpoint increase
ON/OFF (J7)
- ON - OFF switching (long press)
- Display temperature output / Display setpoint output
- Unlock error of safety thermostat
MODE (J4)Summer – winter switching (long press)
+I(J2)Display / Increase of heating setpoint (or room temperature)
-I(J3)Display / Decrease of heating setpoint (or room temperature)
-H+ +H
(J5 + J6)Enabling function Eco/Comfort (only if JP8 = 0 and P8 = 0)
MODE + ON/OFF
(J4 + J7)Start function degassing
J7
J6
J5J4J3J2

11
TURNING ON THE BOILER
The boiler is switched-on by means of the general switch located on the left of the display
in the instrument panel of the boiler. Pressing the switch upward to the ON position, it will
light in the presence of single-phase supply (230-240 V - 50 Hz). Then, it shall be pressed
the ON-OFF (J7) on the keypad to switch the power from stand-by to the operating
position, the display will light up of blue and will appear various symbols signaling
function/faults etc. At this point it shall be chosen the mode of operation, summer or winter
operation.
CHOICE OF THE OPERATION MODE (Winter/Summer)
Pressing the key MODE (J4), i twill be chosen the mode of operation, wintry or summery.
Pressing repeatedly each time for at least 5 seconds, you switch from WINTER to
SUMMER or from SUMMER to WINTER then.
When the device will be in WINTER mode, on the display will appear the Symbol C
(snow). When the device will be in SUMMER mode, on the display will appear the Symbol
B (sun).
TEMPERATURE VARIATION OF THE HEATING CIRCUIT
When the apparatus has been set with the snow symbol ( C ) for the wintry functioning, you
can change the maximum temperature of heating circuit pressing one of the two keys with
the radiator symbol located on the left of the display (+ I and – Ikeys ). The key with the
symbol + I (J2), increases the temperature, and the key with the symbol - I (J3)
decreases the temperature.
TEMPERATURE VARIATION OF HOT SANITARY WATER
The temperature of hot sanitary water can be varied independently from the mode of
functioning, both wintry and summery. The two keys with the Tap symbol on the left of the
control panel, are used to set the maximum temperature of the hot sanitary water circuit.
The key with Symbol + H (J6) increases the temperature, and the one with the Symbol - H
(J5) decreases the temperature.

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ON-OFF KEY
Display symbols
The ON/OFF (J7) key, in addition to put the
boiler in stand-by mode, allows to reset (unlock)
the apparatus in case of high temperature lock.
If the lock would be caused by lack of water
pressure alarm, the recovery will be automatic
after that the hydric pressure will be restored at the minimum operating level (0,08 MPa -
0,8 bar) by means of the operating and the closure of the charging tap placed under the
boiler (black handle). The display has several symbols, signaling in addition to operation
modes, also the various alarm or system displays:
Symbol Meaning
L Malfunction
J Request of burner switch-on
I Heating request
H Sanitary request (generic)
G Function sanitary Comfort activated
F Parameter menu activated
E Anti-freeze request activated
C Winter mode
B Summer mode
A OFF mode
Level of
modulation Indicates the instantaneous power of the boiler by 0 to 100%

13
INSTALLATION
TECHNICAL NOTE FOR INSTALLER AND TECHNICAL MAINTENANCE
HYDRAULIC SCHEME
(ElektraCompact 12 kWBP-L 016 version)
Legend
- TS Safety thermostat. - rs Filling tap.
- VSS Safety valve sanitary circuit ½”x0,65 MPa (6,5 bar). - PA Water pressure switch.
- VSR Safety valve heating circuit ½”x0,3 MPa (3 bar). - AM Magnesium anode.
- VE Expansion vessel heating circuit. - VDEElectric diverter valve.
- R Hydraulic connection inlet heating circuit. - RC Boiler resistance 3/6 kW.
- M Hydraulic connection outlet heating circuit. - RS Sanitary resistance 2 kW.
- rsc Drain valve of boiler body. - CC Boiler body.
- SThermowell for immersion sensor. - rsb Drain valve of tank.
- AF Hydraulic connection inlet sanitary (cold water). - BS Hot water storage tank 37 liters.
- AC Hydraulic connection outlet sanitary (hot water). - SP Brazed heat exchangers.
For the other models, the only changes refer to the number of electric resistances; the 6 kW
version has two 3 kW resistances (detail RC), the 12 kW version has two 6 kW resistances, the 18
kW version has three 6 kW resistances and the 24 kW version has four 6 kW resistances.

14
CONNECTING SCHEME
black
Yellow / green
brown blue brown blue blue
brown
PI
F N
TA
SM SBSE
PSA
TS
1 2 3
1
4 5 6 7 8 9 10 11
5151 50 49 48 47 46 4544 434241 40 38 3736
55
56
54
J11
Interface 961.O
JP7 JP8 JP9 JP10
0 1
39
1
2
3
1
2
3
4
5
6
7
J14 J12
J11
J5
J6
N
FT
G3
G2
G1
G4
OUT
230-240V
53
OT
PE
F.E.
PWM
whyte
yellow
red
blue
brown
black
black
black
brown
brown
blue
brown brown
blue
brown
blue
red
blue
white
red
white
brown
black
DHW
CH
COM
3WAY
VALVE
FLM
G5
brown

15
MAIN ELECTRIC SCHEME
F
N
GX
TS
ON/OFF
GX
MAIN PCB
SIEMENS
Contact
TS
FT
N
A
2 A1
R
SIEMENS
brown
blue
blue
blue
brown
brown
brown
brown
blue
black
black
black
brown
blu
blue
black black black
230-240
V
-5
0
TSB
Legend electric scheme
Single phase F
Neutral N
Selected phase from contactor FT
Electric pump (circolatore a prevalenza variabile) PI
Control of contact TS on contactor of power (C-NO) cTS
Sanitary microswitch (control Comfort function) MS
Control gate triac n°1 (4 KW power) G1
Control gate triac n°2 (2 KW power) G2
Control gate triac n°3 (4 KW power) G3
Control gate triac n°4 (2 KW power) G4
Control gate triac n°5 (2 KW sanitary tank) G5
Delivery heating probe (ntc sensor) SM
External probe (sensor) SE
Sanitary probe (tank) SB
Water pressure switch PSA
Safety thermostat TS
Safety thermostat tank TSB
Room thermostat (terminal provided) TA
Connection with remote control OpenTherm (optional) OT
General switch (Also disconnects power to the board) ON/OFF
Functional ground derived from the point ground F.E.
Properly grounded point this application PE

16
TRIAC – Connection scheme

17
MANUFACTURE CONSTANTS
Function Value
Delta off tank probe 0 °C
Delta on tank probe -1 °C
Intervention temperature antilegionella 65 °C
Intervention interval antilegionella 7 days
Maximum temperature primary circuit 80 °C
Time of pump functioning in anti-lock 10 sec
Intervention time anti-lock pump 24 hour
Temperature antifreeze On (only circulator) < 8 °C
Temperature antifreeze On (heat exchanger ignition) < 5 °C
Temperature antifreeze Off > 20 °C
SETPOINT AND PARAMETERS
Function Default Range
Heating setpoint 60 °C 30 ÷ 75 °C
Floor heating setpoint 30 °C 10 ÷ 40 °C
Room setpoint (with external probe present) 20 °C 10 ÷ 30 °C
Tank setpoint 60 °C 30 ÷ 65 °C
Instantaneous DHW setpoint 50 °C 30 ÷ 60 °C
PARAMETERS
Function Display Def. Range
External probe start up P : 1 0 0 – 1
Building coefficient of dispersion P : 2 35 5 ÷ 35 °C
Sanitary post circulation P : 3 15 1 ÷ 180 sec
Heating post circulation P : 4 30 1 ÷ 180 sec
Heating exchanger circulation starting P : 5 0 0 ÷ 240 sec
Min. ignition temperature circulator P : 6 30 0 ÷ 50 °C
Delivery differential of sanitary P : 7 15 0 ÷ 20 °C
Type kettle present P : 8 0 0 = Internal probe
1 = External thermostat
2 = External probe
Type of sensor required tank P : 9 10 = flow switch and
three-way pneumatic
1 = flow meter and
electric three-way
Speed pump PWM operation P : 10 4
1 = 400 l/h
2 = 800 l/h
3 = 1.000 l/h
4 = 1.200 l/h

18
TEMPERATURES
Function Display
Delivery temperature T :[h
Tank temperature T :Dh
External temperature T :Ep
Offset setpoint of external probe T :Se
SELECTION JUMPERS (move the jumpers with no power board)
0
Jumper position 0
1 01
Jumper position 1
Jumper 0 1 Default
JP7 High temperature (radiator) Low temperature (floor) 0
JP8 Combined Heating only 0
JP9 Sanitary with tank Sanitary instantaneous 0
JP10 Boiler application Scaldamassetto application 0
CONTROL OF MAIN HEAT EXCHANGER (BOILER BODY)
According to the required power during the heat request, the controls by G1 to G4 related
to the main exchanger are turned on all or partially. The actuaction of each control is
reduced to a lapse of 4 seconds. Higher is the required power, more the control will remain
operative in this lapse. The power in heating or during a sanitary request is calculated by
PID algorithm. Please see in the pictures below two examples related to 40% and 60% of
total power (12 kW).
G1
G2
G3
G4
4 s
G1
G2
G3
G4
4 s
L
e
vel p
o
wer 40% - 4.8kW Level power 60% - 7.2kW
In case of simultaneous request of heating and tank, the controls G1÷G4 related to the
main heat exchanger, and G5, dedicated to tank, will be directed in the following way:
Boiler status Primary G1÷G4 Tank G5
Only heating request G1 ÷ G4 = modulation G5 = OFF
Heating request + tank request G1 ÷ G3 = modulation
G4 = OFF G5 = ON
Heating request + flow switch request G1 ÷ G3 =modulation
G4 = OFF G5 = ON
Sanitary flow meter flow rate expressed in liters/minute Fl.mt

19
Controls rotation
Every hour the order of ignition of triac G1÷G4 controls is rotated in such a way to partition
evenly in time the use of all heating elements.
CONTROL OF EXTERNAL PROBE
Installation and functioning at sliding temperature
For the connection of the External Probe, it shall be used the Original Kit
FIAMMA code F.532 provided in the accessories of the electric boilers
Elektra. The electrical connection shall be done in the external terminal at
the general electric panel already prearranged in the standard cabling of
the boiler. The connection must be carried out with junction cables and wires having a
minimum section of 1,5 mm and, if possible, avoiding the insertion along with electric lines,
digital lines of inverter or other not compatible.
After the connection the external probe must be enabled by means of the introduction of a
variation of P1 parameter, changed from 0 to 1.
Then the setpoint chased by the heating delivery probe will be calculated as follows:
Tch [°C] = [( Troom [°C] – Text [°C]) * dc/10 ] + Troom [°C]
Tch : heating setpoint calculated by the system
Troom: ambient temperature set by the user
Text: outside temperature measured by the probe
dc: dispersion coefficient of the building can be set by parameter P2.
28
33
38
43
48
53
58
63
68
73
-20-15-10-505101520
35 30 25 20 15
10
8
5
Text [°C]
Tch[°C]
Examples of curves with Troom set at 20°C and JP7 = 0
20
25
30
35
40
-20-15-10-505101520
35 30 25 20 15 10 8
5
Text [°C]
Tch [°C]
Examples of curves with Troom set at 20°C and JP7 = 1

20
ANTIFREEZE FUNCTION
In case the delivery probe measures a temperature lower than 7°C, the circulator is
activated. If the temperature goes down the value of 4°C, the primary exchanger (boiler
body) is turned on until bringing the outlet temperature to 20°C. The antifreeze function is
active also with the boiler turned OFF (function in standby mode but with bright switch on).
TANK REQUEST (JP9 = 0 - P8 = 0)
Standby or with simultaneous heating request:
In this case, if the temperature measured by the tank probe is lower than the tank setpoint
-1°C, is activated the control G5 related to the tank resistance. When the temperature at
the tank sensor is higher than the boiler setpoint G5 control is turned off. The activation of
G5 causes the shutdown of the G2 or G4 (2 kW) in such a way that the maximum total
consumption of the system can always be 12 kW.
Sanitary flow meter request:
When receiving a request by the sanitary flow switch, the resistance related G5 control (2 kW)
the boiler is activated independently until the storage tank temperature remains below 70°C.
In ECO mode is not activated any of the primary exchanger resistance.
In COMFORT mode simultaneously G1 commands are also controlled, G2, G3, G4
relative to the primary exchanger bringing the supply temperature to the boiler setpoint +
differential set using parameter P7. At the end of the request, the circulator remains
powered for a time equal to the value set by parameter P3.
Pre-heat exchanger primary:
In condition of stand-by with active COMFORT function, the primary exchanger is
maintained in temperature in order to ensure a prompt response of sanitary. The main
heat exchanger is maintained at a temperature equal to the setpoint plus a kettle
temperature difference settable by means of the parameter P7. The maximum power
used to manage this phase is 6 kW.
ANTILEGIONELLA FUNCTION
The system continuously monitors the temperature of the kettle. If within a certain time
interval the temperature does not reach the value of 65°C, the tank resistance is
automatically ignited in order to avoid bacterium growth.
The operating time of the legionella function is 3 hours from the first ignition and then
every 7 days.