DOMUSA TEKNIK AVANTTIA HDX User manual

OPERATION USER GUIDE
AVANTTIA
ER-0170/1996
CGM-04/392

Thank you for choosing a DOMUSA TEKNIK heating boiler. From the
range of DOMUSA TEKNIK products you have chosen the Avanttia
model. With a suitable hydraulic installation, this boiler is capable of
providing you with the temperature comfort suitable for your home, as
well as balanced and economical Domestic Hot Water (DHW)
production.
This manual forms an essential part of the product and it must be
given to the user. Read the warnings and recommendations in the
manual carefully, as they contain important information on the safety,
useandmaintenanceoftheinstallation.
These boilers are to be installed by skilled personnel only, in
accordance with the legislation in force and following the
manufacturer’sinstructions.
The start-up of these boilers and any maintenance operations must
only be carried out by DOMUSA TEKNIK’s Authorised Technical
AssistanceServices.
The instructions shall include the substance of the following: This
appliance can be used by children aged from 8 years and above and
persons with reduced physical, sensory or mental capabilities or lack of
experience and knowledge if they have been given supervision or
instruction concerning use of the appliance in a safe way and
understand the hazards involved. Children shall not play with the
appliance. Cleaning and user maintenance shall not be made by
childrenwithoutsupervision.
Incorrect installation of these boilers could result in damage to people,
animals or property, and the manufacturer will hold no liability in such
cases.
DOMUSA TEKNIK informs all parties concerned that, in compliance
with section 1 of the first additional provision of Law 11/1997, the
responsibility for delivering packaging waste or used packaging for its
proper environmental management will be that of the final owner of
the product (Article 18.1 Royal Decree 782/1998). At the end of its
useful life, the product must be taken to a selected collection point for
electrical and electronic equipment or must be returned to the
distributor at the time of purchasing a new equivalent appliance. For
more detailed information on the collection schemes available, contact
either the collection facilities of the local authority or the distributor
wherethepurchasewasmade.

1
ÍNDICE Pág.
1COMPONENTSDIAGRAM................................................................................................................................................2
2CONTROLELEMENTS........................................................................................................................................................4
3DIGITALDISPLAY................................................................................................................................................................5
3.1OPERATION IN “STANDARD”DISPLAY MODE.....................................................................................................................................5
3.2CHANGING THE SETTINGS....................................................................................................................................................................7
4OPERATION...........................................................................................................................................................................8
4.1SELECTING THE BOILER SETPONT TEMPERATURE ...............................................................................................................................9
4.2SELECTING THE DHWSETPOINT TEMPERATURE................................................................................................................................9
4.3SELECTING THE SETPOINT TEMPERATURE OF HEATING CIRCUIT 1..................................................................................................10
4.4SELECTING THE SETPOINT TEMPERATURE OF HEATING CIRCUIT 2..................................................................................................10
5ADDITIONALFUNCTIONS............................................................................................................................................11
5.1ANTILEGIONELLA FUNCTION .............................................................................................................................................................11
5.2PUMPS ANTI-BLOCK FUNCTION.........................................................................................................................................................11
5.3ANTI-FROST FUNCTION......................................................................................................................................................................11
5.4BOILER PRESSURE SENSOR FUNCTION...............................................................................................................................................11
5.5RESETTING TO FACTORY DEFAULT VALUES.......................................................................................................................................11
5.6CONNECTING THE LAGOFBOT+REMOTE CONTROL...................................................................................................................11
5.7ROOM THERMOSTAT CONNECTION...................................................................................................................................................11
6FUNCTIONINGOFHEATINGCIRCUIT2(OPTIONAL)..........................................................................................12
7LAGOFBOT+REMOTECONTROL(OPTIONAL)....................................................................................................13
7.1FUNCTIONING WITHOUT AN OUTDOOR SENSOR..............................................................................................................................13
7.2FUNCTIONING WITH AN EXTERNAL SENSOR (OPTIONAL)................................................................................................................14
7.3DHWFUNCTION................................................................................................................................................................................14
8COMMISSIONINGOFTHEBOILER.............................................................................................................................15
9BOILERDELIVERY.............................................................................................................................................................15
10 SHUTTING DOWN THEBOILER.................................................................................................................................15
11DRAININGTHEBOILER................................................................................................................................................15
12SAFETYCUT-OUTS........................................................................................................................................................16
12.1TEMPERATURE SAFETY CUT-OUT ....................................................................................................................................................16
12.2BURNER CUT-OUT............................................................................................................................................................................16
12.3LOW PRESSURE CUT-OUT ................................................................................................................................................................16
13BOILERMAINTENANCE...............................................................................................................................................17
14ALARMCODES...............................................................................................................................................................19
15DIAGRAMSANDMEASUREMENTS.........................................................................................................................20
15.1AVANTTIA HDX...............................................................................................................................................................................20
15.2AVANTTIA HDXM...........................................................................................................................................................................21
16TECHNICALCHARACTERISTICS................................................................................................................................22
16.1PRODUCT DATA (ACCORDING TO EC/125/2009DIRECTIVE).....................................................................................................22
16.2TECHNICAL DATA ............................................................................................................................................................................22
17ELECTRICALCONNECTIONDIAGRAM...................................................................................................................24
17.1AVANTTIA HDX...............................................................................................................................................................................24
17.2AVANTTIA HDXM...........................................................................................................................................................................25
18COMMERCIALGUARANTEE.......................................................................................................................................26

Avanttia
2
1COMPONENTSDIAGRAM
1
Avanttia HDX
9
11
3
7
8
6
2
10
4
5
1.Heatexchanger.
2.DHWexpansionvessel.
3.Mainprimarycircuitdrain.
4.Heatingexpansionvessel.
5.DHWstoragetankInox.
6.Disconnectfill.
7.Siphonsafetygroup.
8.Safetygroup.
9.Automaticboilerdrainvalve.
10.Mainheatingcircuitdrain.
11.Heatingcircuitcirculationpump.

3
1
Avanttia HDXM
9
11
3
7
8
6
2
10 4
5
13
14
12
1.Heatexchanger.
2.DHWexpansionvessel.
3.Mainprimarycircuitdrain.
4.Heatingexpansionvessel.
5.DHWstoragetankInox.
6.Disconnectfill.
7.Siphonsafetygroup.
8.Safetygroup.
9.Automaticboilerdrainvalve.
10.Mainheatingcircuitdrain.
11.Heatingcircuitcirculationpump.
12.Motorized3wayvalve.
13.Automaticairvent.
14.Heatingmixedcircuitcirculationpump.

Avanttia
4
2CONTROLELEMENTS
16 19 2018
15
17
15. Digital display:
This is the main boiler functioning display, on
which all the operating information, settings
and values appear. This display is also used to
access the appliance’s user and service settings.
In standard operating mode (default display),
the actual boiler temperature is shown. If
malfunction occurs, an alarm code will appear
on the digital display instead of the
temperature.
16. Boiler temperature touch button:
This is used to select the boiler setpoint
temperature. It is also used to disable the hot
waterfunction.
17. DHW temperature touch button:
This is used to select the setpoint temperature
for domestic hot water. It is also used to disable
theDHWfunction.
18. MODE touch button:
This button is used to access and browse the
differentmenus.
19. ON touch button:
Thisbuttonswitchestheboileronandoff.
20. RESET touch button:
When the boiler is in lock-out mode, the RESET
button is pressed to reset the lock-out and
restore “Standard” functioning. If you are
modifying any of the settings or browsing the
menus, you may press the RESET button to exit
the menu WITHOUT SAVING and return to the
previousmenulevel.

5
3DIGITALDISPLAY
The Avanttia boilers are electronic and have a display (15) forviewingthedifferentboilersettings.The
displayhasvariouszoneswheredifferenticonsand numbers appear to indicate the different statuses.
3.1 Operation in “standard” display mode
AB C
F
D E
AIndicationofboilerstatus: Heatingfunctionenabled.
DHWproductionenabled.
BIndicationofburnerstatus: Burnerfunctioning.
Boilerlock-out.
CNumericaldisplay.
DSpecialoperatingicons.
Anti-frost function: Thisflasheswhentheboiler’s anti-frost function is enabled.
Servicing spanner: Steady: When any of the boiler’s technical settings on the “Service
menu"
arebeingbrowsedormodified.
Flashing: Whenmanualfunctioningofanyoftheoutletsisforced.
EAuxiliaryicons.
Steadilylitwhenthedigitsshowatemperature.
bar Steadilylitwhenavalueorsettingconnected with the boiler water pressure is shown.
EXT Steadilylitwhenavalueorsettingconnected with the outside temperature is shown.
INT Steadily lit when a value or setting connected with the temperature inside the home or
settingsconnectedwiththeLAGOFBOT+are shown.
FOperatingmodeicons(seenextpage).
cd1 radiator: This appears on the display when the circulating pump of direct circuit 1 is
switched on (BC1 on and Sr1 not connected) or when a value or setting
connectedwithdirectcircuit1isshown.

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6
cd2 radiator: This appears on the display when the circulating pump of direct circuit 2 is
switched on (BC2 on and Sr2 not connected) or when a value or setting
connectedwithdirectcircuit2isshown.
cm1 radiator: This appears on the display when the circulating pump of mixed circuit
1 is switched on (BC1 on and Sr1 connected) or when a value or setting
connected with mixed circuit 1 is shown. The arrows appear according
to the mixed circuit 1 mixer valve control. The upper arrow indicates
that the hot channel of the valve is open, and the lower arrow shows
thatthehotchannelofthevalveis closed.
cm2 radiator: This appears on the display when the circulating pump of mixed circuit
1 is switched on (BC1 on and Sr1 connected) or when a value or setting
connected with mixed circuit 2 is shown. The arrows appear according
to the mixed circuit 2 mixer valve control. The upper arrow indicates
that the hot channel of the valve is open, and the lower arrow shows
thatthehotchannelofthevalveis closed.
House: Steadily lit when a value or setting connected with the temperature inside or
outside the home or settings connected with the room thermostat or remote
controlsareshown.
K curves: Steadily lit when a value or setting connected with operating in accordance
withoutsideweatherconditionsorKcurvesis shown.
Recirculation: Steadily: When any value or parameter related to the recirculation of DHW
is displayed or when it's ON the recirculation of DHW function (the
auxiliaryinputofthecontrollerisclosed.
Flashes: When the DHW recirculation pump is ON (Auxiliary boiler relay
activated).
Boiler: Steadilywhenviewinganyvalueorparameterrelated to the gas boiler.
Hot water tank: Steadily lit when a value or setting connected with the DHW hot water
tanktemperatureorfunctioningisshown.
Browser: Steadily lit when any of the “User Menus" or "Service menus” are being
browsed.
SET Flasheswhenaccessismadetomodifyany of the settings.

7
3.2 Changing the settings
The boiler adjustment settings are located in the “User Menu" and the “Service menu" . To access the
“User Menu" , press . Then press repeatedly to progress sequentially through the user settings. If
the setting shown can be modified, SET will flash on the display and the setting can be changed by
pressingthe“”and“▬”symbolsforDHW (17) and heating (16) .
Thesesettingsarelistedinthetablebelow:
Nº. Setting Type Range Display
1 DHW setpoint temperature Modificable Off, 15 – 65 ºC
By default: Off
2 Actual DHW temperature Visual
3 Boiler setpoint temperature Modificable Off, 25 – P.08
By default: Off
4 Actual boiler temperature Visual
5 Water pressure Visual
6 Boiler setpoint temperature enabled Visual
7 Setpoint flow temperature of mixed circuit 1 Modificable Off, 10 – 45 ºC
By default: Off
8 Actual flow temperature of mixed circuit 1 Visual
9 Setpoint flow temperature of mixed circuit 2 Modificable Off, 10 – 45 ºC
By default: Off
10 Actual flow temperature of mixed circuit 2 Visual
11 Actual outdoor temperature Visual
12 Heating demand Visual
13 Display contrast Modificable 1 – 5
By default: 3

Avanttia
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4OPERATION
The Avanttia boiler is designed to heat a heating installation and provide domestic hot water,
instantlyand/orbycollection.
Standaring functioning:
The boiler provides both heating and DHW in this mode. The burner and the circulating pump
will switch on and the diverter valve will switch to DHW mode. When the DHW storage tank
reaches the DHW setpoint temperature selected, it was ready to warm the heating installation, by
putting the diverter valve in heating mode. The burner will shut down when the boiler reaches its
selected setpoint temperature. The circulation pump will stop when the room temperature reaches
orexceedsthetemperaturesetontheinstallation’s room thermostat (if it has one).
Functioning according to outdoor temperature conditions
When the boiler is connected to an outdoor temperature sensor (supplied with the boiler),
functioning may be activated according to the
outdoor temperature conditions, using parameter
P.10onthe "TechnicalMenu" .
When this operating mode is activated, the boiler
and/or heating output temperature are
determined in accordance with the K curve set (for
parameter P.11 of the "Technical Menu" for circuit
1 and P.31 for circuit 2) and the outdoor
temperature measured. If the installation is
correctly dimensioned, the boiler temperature
and/or output temperature calculated will ensure
the room temperature is in accordance with the
setpointprogrammed.
The K curve relates the outdoor temperature
reading on the sensor installed outside the home
to the boiler temperature setpoint. The graph
shows the temperature ratio for each point on the
Kcurve.
IMPORTANT: To connect the outdoor temperature sensor to the boiler, carefully follow the
connection instructions provided in the
"ElectricalConnections" section.
Disabling the heating function (Summer Mode):
In this mode, the boiler provides DHW but not heating. To disable the heating function, press the
heating“▬”symbol
(16) until“oFF”appearsonthedisplay.
Disabling the DHW function:
In this mode the boiler provides heating but not DHW. To disable the DHW function, press the
DHW “▬” symbol (17) until “oFF” appears on the display. The burner, the circulation pump and the
diverter valve are in heating mode. The burner will shut down when the boiler reaches its selected
setpoint temperature. The circulation pump will stop when the room temperature reaches or
exceedsthetemperaturesetontheinstallation’sroom thermostat (if it has one).
K - factor
0,5
0,6
0,7
0,8
0,9
1
1,5
22,53
4
5
6
20
25
30
35
40
45
50
55
60
65
70
75
80
85
-20-15-10-505101520
Outdoor Temperature (ºC)
Boiler Temperature (ºC)

9
4.1 Selecting the boiler setpont temperature

Depending on the boiler configuration, the Heating “” and “▬” symbols (14) may be used to
select the desired boiler functioning temperature, as well as enabling and/or disabling the heating
function.
Providing there is a direct circuit that is not functioning according to the outside weather
conditions (P.11 = oFF and/or P.31 = oFF), or when no second heating circuit is installed, the
Heating “” and “▬” symbols (16) can be used to selected the desired boiler functioning
temperature,inadditiontoenablingand/ordisablingthe heating function.
The boiler setpoint temperature can also be selected by pressing until the icon appears on
the display, with the word SET flashing. The setting can be changed by pressing the Heating “”
and“▬”symbols (16) .
In all other cases, pressing the Heating “” and “▬” symbols (16) will only enable and/or disable
theheatingfunction.
The permitted boiler setpoint temperature range is 25 - 85 ºC. Model Avanttia boilers are
condensing boilers. In order to obtain maximum boiler performance and energy savings, it is
recommended to select a setpoint temperature of 60 - 70 ºC, providing this is permitted by the
heatingsysteminstalledandtheinsulationconditionsof your home.
4.2 Selecting the DHW setpoint temperature

The desired DHW temperature can be selected by pressing the DHW “” and “▬” symbols (17) . If
theyarenotpressedfor2seconds,the display will return to “standard” mode.
The DHW setpoint temperature can also be selected by pressing until the icon appears on the
display, with the word SET flashing. The setting can be changed by pressing the DHW “” and “▬”
symbols (17) .

Avanttia
10
4.3 Selecting the setpoint temperature of heating circuit 1

The flow temperature of the circuit may be selected, providing heating circuit 1 is a mixed circuit
(heating pump of circuit 1 (BC1) and the mixer valve (M1) and sensor (Sr1)) and it is not functioning
in accordance with outside weather conditions (P.11 = oFF). To select it, press to browse until
the icon appears on the display with the SET symbol flashing. The temperature can be
changedbypressingtheHeating“”and“▬”symbols
(16) .
However, if the boiler is functioning according to outside weather conditions (external EVT sensor
connected and P.10 = oN and P.11 not oFF), the circuit flow temperature cannot be selected; only
the K curve canbe selected with the P.11setting.
4.4 Selecting the setpoint temperature of heating circuit 2

The flow temperature of the circuit may be selected, providing heating circuit 2 is a mixed circuit
(heating pump of circuit 1 (BC2) and the mixer valve (M2) and sensor (Sr2)) and it is not functioning
in accordance with outside weather conditions (P.31 = oFF). To select it, press to browse until
the icon appears on the display with the SET symbol flashing. The temperature can be
changedbypressingtheHeating“”and“▬”symbols (16) .
However, if the boiler is functioning according to outside weather conditions (external EVT sensor
connected and P.10 = oN and P.11 not oFF), the circuit flow temperature cannot be selected; only
the K curve canbe selected with the P.31setting.
When both the boiler’s circuits are functioning with an external sensor, the Heating “” and
“▬” symbols
(16) can only be used to enable or disable the heating function.

11
5ADDITIONALFUNCTIONS
TheAvanttia boilerhasthefollowingadditionalcontrolfunctions:
5.1 Antilegionella function
Using the P.17 parameter, it is possible to activate the function of protection against Legionella
bacterium. With the feature enabled, every 7 days, DHW tanktemperature rises up to 65 ºC.
5.2 Pumps anti-block function
This feature prevents the boiler circulation pumps from seizing up if they have been out of use for a
longperiod.Thissystemremainsenabledwhilethe boiler is plugged into the mains.
5.3 Anti-frost function
This function protects the boiler from freezing up during cold weather. If the boiler temperature
drops to below 6 ºC, the heating circulation pump will start up. If the boiler temperature continues
to drop and reaches 4 ºC, the burner will start up, heating the installation. When this function has
been activated, it will continue working until the boiler reaches 8 ºC. This system remains on
standbywhiletheboilerispluggedintothe mains.
5.4 Boiler pressure sensor function
This function prevents boiler failure caused by a low water level and excess pressure in the boiler.
The pressure is detected by a pressure sensor, and its value appears on the control panel display
(on the “User Menu” ). If the pressure drops below 0.05 MPa (0.5 bar), the electronic control switches
off the boiler and triggers an alarm on the display ("E02"). When the boiler pressure exceeds 0.25
MPa (2.5 bar), an alarm is triggered on the display ("HI")to warn of the excess pressure. If this should
occur, we recommend calling the nearest Technical Assistance Service, and draining the boiler
untilthepressureisbetween0.1and0.15 MPa (1 and 1.5 bar).
5.5 Resetting to factory default values
If these settings are wrongly adjusted or if the boiler functions incorrectly, all the original settings of
all the parameters canbe restored by selecting oH in parameter P.26.
5.6 Connecting the LAGO FB OT+ remote control
The boiler has a terminal strip, J5, for connecting the LAGO FB OT+ remote control (see
"Connection Diagram” ). This allows the heating mode for circuit 1 to be switched off, according to
theroomtemperature.
Installing the LAFO FB OT+ remote control enables the heating and DHW system to adapt to the
scheduled times for use of the installation. It also optimises the installation’s functioning, adapting
theheatingsetpointtemperaturetotheroomtemperature and improving comfort.
5.7 Room thermostat connection
The boiler has two terminal strips, J4 and J6, for connecting room thermostats or room
chronothermostats (TA1and TA2, see "Electrical Connection Diagram”). This allows the heating
mode for each circuit installed to be switched off according to the room temperature. To connect it,
remove the bridge joining the terminals of each terminal strip, J4 and J6, and connect room
thermostatNº1orNº2forcircuits 1 or 2 respectively.
Installing a room thermostat will optimise the performance of the installation, adapting the heating
to your home’s requirements and obtaining enhanced comfort. Also, if the thermostat allows the
hours of functioning to be programmed (chronothermostat), it can adapt the heating system to the
hoursofuseoftheinstallation.

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6FUNCTIONINGOF HEATING CIRCUIT2 (OPTIONAL)
All the boiler models in the Avanttia range may optionally control a second heating circuit. For this
second circuit to be controlled, a second circulating pump (BC2) needs to be installed on the boiler if a
direct circuit is required, or a pump (BC2) and a mixer valve (M2) if a mixed circuit is required. For
correct installation, carefully follow the instructions given in the “Installation with two heating circuits”
sectionofthismanual.
Direct circuit functioning
Heating circuit 2 will work with the selected boiler setpoint temperature and the temperature of
room thermostat 2 (TA2) (if the boiler has one). When circuit 2 is functioning with an external
sensor (P.10 = ON and P.31 not OFF), the boiler temperature will depend on the outside
temperatureandthecurveselectedinsettingP.31.
Mixed circuit functioning
Heating circuit 2 will work with the selected setpoint flow temperature for mixed circuit 2 and the
temperature of room thermostat 2 (TA2) (if the boiler has one). When circuit 2 is functioning with
an external sensor (P.10 = ON and P.31 not OFF), the setpoint flow temperature will depend on the
outside temperature and the curve selectedin setting P.31.
In both cases, the burner, the heating pump of circuit 2 (BC2) and the mixer valve (M2) (if the
installation has one) will begin to function until the selected temperature is reached in the installation
or on room thermostat 2 (if the installation has one). When the temperature of the installation drops
belowtheselectedboilertemperature,theburnerwill start up again, running the heating cycle.

13
7LAGOFB OT+ REMOTECONTROL (OPTIONAL)
A remote control (LAGO FB OT+) can optionally be supplied together with the Avanttia boiler. This
remote control can be used to fully operate the boiler from anywhere in the room in which it is
installed. The LAGO FB OT+ remote control governs the parameters of heating circuit Nº 1 and the
installation’sdomestichotwaterproduction.
This remote control allows the hours of home comfort to be programmed for heating circuit Nº 1,
adjusting the installation to the particular requirements of the home by measuring the room
temperature and consequently adapting the installation temperature. The remote control can also be
used to adjust the hot water and heating set point temperatures at any time, and for viewing the
differentboileroperationparameters.Italsowarnsof any functioning anomalies affecting the boiler.
The LAGO FB OT+ remote control may optionally be connected to an external sensor, for measuring
the outside temperature. With this option installed, the remote control can adjust the home comfort
level (circuit Nº 1) according to the weather conditions at each particular time, optimising fuel
consumptionandheatingcomfortinthehome.
The LAGO FB OT+ remote control takes over the control of the boiler when it is connected to it. The
different selectable boiler temperatures must be modified using the remote control. Itis easy to install,
only requiring 2 wires for communication between the boiler and the LAGO FB OT+ control. It is
connected to the boiler by connecting the two wires on terminal strip J6 (see “Electrical Connection
Diagram”). For correct installation and functioning, carefully read the instructions enclosed with the
remotecontrol.
The following sections contain a general explanation of the different operating modes and options of
theLAGOFBOT+remotecontrol.
NOTE: The "AF outdoor temperature sensor" indicated in the instructions manual of remote
controller is not compatible with the boiler, so it is compulsory the use of "EVT outdoor
sensor" (provided within the boiler) to measure the outdoor temperature.
7.1 Functioning without an outdoor sensor
Conventional heating installation (direct circuit)
The maximum temperature for heating circuit Nº 1, the heating times and the desired room
temperatures can be selected on the remote control. The LAGO FB OT+ remote control will
calculate the boiler temperature required at each particular time, depending on the temperature
of the room, and it will activate or disable the heating mode of circuit Nº 1 depending on the
heatingtimesandroomtemperaturesprogrammed.
Instalation of heating circuit Nº 2 (optional)
If the boiler is supplied with an second heating circuit, this circuit is adjusted and controlled via
theboilercontrolpanel(see "Functioningof heating circuit Nº 2 (optional)" ).

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14
7.2 Functioning with an external sensor (Optional)
If the LAGO FB OT+ remote control is fitted with an outdoor temperature sensor, it can calculate the
heating temperature of heating installation Nº 1 according with the outside weather conditions at
each particular time, with optimum adjustment of the heating installation conditions for improved
heatingcomfortinthehomeandenergysavings.
The maximum temperature and an operating curve for heating circuit Nº 1, the heating times and
the room temperatures desired can all be selected on the remote control (see instructions enclosed
with the LAGO FB OT+ remote control). The LAGO FB OT+ remote control calculates the required
boiler temperature at each particular time, depending on the temperature inside the home and the
outside weather conditions, in accordance with the operating curve selected (parameter 01 on the
“User Menu" of the LAGO FB OT+), switching the heating on and off in accordance with the heating
timesandtheroomtemperaturesprogrammed.
Dependingonthetypeofheatingcircuit,the following adjustments should be made:
Conventional heating installation (direct circuit)
In setting 01 of the LAGO FB OT+ “User Menu" , select a curve of at least 1. The maximum boiler
temperaturecanalsobeselectedontheLAGO FB OT+ remote control.
Installing low temperature heating (mixed circuit)
In setting 01 of the LAGO FB OT+ “User Menu” , select a curve of less than 0.8. We also
recommend selecting a maximum flow temperature NO HIGHER THAN 85ºC, to protect the
underfloor heating installation from overheating. To do this, select the maximum flow
temperatureofheatingcircuit1insetting07 of the LAGO FB OT+ “ServiceMenu” .
0,2
0,4
0,6
0,8
1
1,2
1,5
20
25
30
35
40
45
50
55
60
65
70
75
80
85
20161284 0-4-8-12-16
Outdoor Temperature (ºC)
Boiler Temperature (ºC)
K Curves
NOTE: The "AF outdoor temperature sensor" indicated in the instructions manual of remote
controller is not compatible with the boiler, so it is compulsory the use of "EVT outdoor
sensor" (provided within the boiler) to measure the outdoor temperature.
7.3 DHW function
When the remote control is connected to an Avanttia boiler, the desired DHW temperature and the
desired hours for DHW use can be selected on the LAGO FB OT+ remote control. The LAGO FB OT+
remote control regulates the DHW tank temperature at each particular time, and enables or
disablestheDHWfunctionaccordingtothetimes scheduled.

15
8COMMISSIONINGOF THE BOILER
The start-up of the boiler, for the validity of warranty to be in force, is to be carried out by an
authorised Technical Assistance Service. Prior to proceeding to such a start-up, the following steps
willbeperformed:
-Checkthattheboilerisproperlyconnected to the electric power supply.
- Check that the installation is filled with water (the pressure gauge must indicate a pressure
between0.1and0.15MPa(1and1.5 bar)).
-Checkfortheproperchimneyinstallation.
-Checkthatthegassupplyconnectionis properly installed.
- Drain the air off the boiler gas circuit by opening the shutoff valve of the gas line and loosening
lightly the valve gas intake pressure tapping for a moment as, otherwise, the air would be forced
tocomeoutslowlythroughthepilotburner injector.
- Checkthattheheatingcircuitsoutletandreturn flow valves are opened, if any.
- Turn the chronothermostat or LAGO FB OT+ remote control (if these are fitted) to the desired
setting.
- It is compulsory to do a combustion analysis in the boiler, using a proper tester. The combustion
test will be done through the hole for this purpose, placed in the plastic pipe of combustion
products exhaustion inside the boiler. If test is out of margins described in the section
"Combustionadjustment",itwillbenecessarytoadjust the combustion.
To start up the boiler, hold down the button, select the desired setpoint temperatures and turn
thechronothermostatorLAGOFBOT+remotecontrol (if these are fitted) to the desired setting.
9BOILERDELIVERY
The Technical Assistance Service, once the commissioning of the boiler has been carried out, will
explaintheboileroperationtotheusersby informing them about the most necessary remarks.
The installer will be responsible for explaining to the users the operation of any control or regulation
devicethatisapartoftheinstallation and it is not supplied with the boiler.
10 SHUTTINGDOWN THE BOILER
To switch off the boiler, hold down the button. In Off mode, while the boiler is plugged into the
mains and connected to the fuel installation, its heating and hot water functions will be switched off
buttheanti-frostprotectionandpumpanti-blockfunctions will remain activated.
Toshutdowntheboilerfunctioningcompletely,unplug it from the mains and cut off the fuelsupply.
11 DRAININGTHE BOILER
The water is drained from the boiler by opening the air drain valve (10) , located inside the boiler on
the lower left hand side of the heat exchanger. Connect a flexible tube to this valve and run it to a
drain. After draining theboiler, close the valveagainandremovetheflexible tube.

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12 SAFETYCUT-OUTS
The boiler’s electronic control system may activate the following safety cut-outs to stop the boiler
functioning. When one of these safety cut-outs occurs, the boiler will stop functioning, a cut-out code
willflashonthedisplayandthered alarm warning pilot light will flash on the control panel.
If any of the safety cut-outs described below should occur repeatedly, switch off the boiler and
call your nearest official technical assistance service.
12.1 Temperature safety cut-out
When this cut-out occurs, the "E30" code (temperature alarm) will begin to flash on the digital
display and the alarm warning pilot light will flash on the control panel. The burner will switch off
andstopheatingtheinstallation.
This occurs when the boiler exceeds a temperature of 110 ºC. To unblock it, wait until the boiler
dropstobelow100ºCandpressthe button .
12.2 Burner cut-out
When this cut-out occurs, the code “E09” will begin to flash on the digital display and the flame
failuresymbol.Theburnerwillswitchoffand stop heating the installation.
This occurs as a result of an anomaly in the burner or in the fuel installation. To unblock it, press the
button .
12.3 Low pressure cut-out
When this cut-out occurs, the code “E02” will begin to flash on the digital display and the flame
failure symbol. The burner amd the boiler circulation pumps will switch off, cutting off the heating
andwaterflowtotheinstallation.
This occurs when the boiler pressure drops to below 0.05 MPa (0.5 bar), preventing the boiler from
functioning when the water is drained from the installation, due to either leakage or maintenance
operations.Tounlockit,pressthebutton .

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13 BOILERMAINTENANCE
To maintain the boiler in perfect working order, a yearly overhaul is to be performed by DOMUSA
TEKNIK’s authorisedpersonnel.
Boiler and flue maintenance
Themostimportantaspectstobecheckedare as follows:
- The water pressure in the heating installation, when the water is cold, must be between 0.1
and 0.15 MPa (1 and 1.5 bar). If it is not between these values, it must be filled until they are
reached.
- Thecontrolandsafetydevices(thermostats,gas valve, etc.) must function correctly.
- The burner and the inside of the boiler chamber must be clean. Soft brushes or compressed air
are recommended forcleaning the boiler, toprevent damage. Do not use chemical products.
- Theexpansionvesselmustbefull,inaccordance with the specifications onthevesselplate.
- Checkthegasandwaterinstallationsarecompletely sealed.
- Thefluesmustbefreeofanyobstacles and have no leaks.
- Thegasflowmustremainbetweenthevalues indicated on the Specifications Sheet .
- The circulating pumps and mixer valves (if the boiler is equipped with these) must not be
blocked.
Cleaning the boiler
The boiler does not require any special maintenance. Yearly cleaning at the end of the heating
season will be sufficient. The boiler chamber and burner should not be cleaned using chemical
products or steel brushes. After any cleaning operation has been carried out, it is important to
ensure that several ignition cycles are performed to check all the elements are functioning
correctly.
Aftercheckingtheboilerisfunctioningcorrectly,ensure there are no leaks.
Draining the condensation water
The boiler condensation water drain outlet should not be altered in any way and it must be kept
freeofobstructions.Yearlycleaningofthecondensation collectionsiphonisrecommended.
If a neutralisation system is installed at the condensation drain outlet, it should undergo periodical
maintenance,inaccordancewiththemanufacturer’sinstructions.
Cleaning products
Never use chemical products to clean the boiler. A plastic brush is sufficient, if the cleaning is
carriedoutannually.
The cleaning of the boiler and hydraulic circuit will have lasting effects if water with a hardness of
over 25ºF is treated previously. For softer water no treatment is required. In any case, a descaling
pumpshouldbeusedtocarryoutthe descaling process.

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Anti-frost precautions
The Avanttia boiler, have a function to prevent the installation from freezing, ensuring that the
boiler is connected to the electrical power supply. In any case, and mainly in geographical zones
where very low temperatures are usual, it is advisable to add anti-freezing liquid to heating circuit.
When a verylong period the boileris not going to work,it is advisable to empty the boiler totally.
Boiler water characteristics
In case of water hardness of over 25-30ºF, we recommend using treated water in the heating
installationtoavoidanyscaledepositsonthe boiler.
Bear in mind that a scale deposit of even a few millimetres will cause a major reduction in boiler
performance, as scale isa poor thermal conductor.
Itisessentialtotreatthewaterused in the heating circuit in the following cases:
- Verylongcircuits(containingalargeamountof water).
- Frequentfillingoftheinstallation.
If repeated partial or total draining of the installation is necessary, we recommend filling it with
treatedwater.