DOMUSA BIOCLASS TR User manual

INSTALLATION AND OPERATING INSTRUCTIONS
BIOCLASS TR

Thank you for choosing a DOMUSA TEKNIK heating boiler. Within the
product range offered by DOMUSA TEKNIK you have chosen BioClass TR
model. With a suitable hydraulic installation and with a correct fuel, this
boilerwillprovidetheideallevelofcomfortforyourhome.
This manual forms an essential part of the product and it must be given to
the user. We recommend you read the warnings and recommendations in
the manual carefully, as they contain important information on the safety,
useand maintenance of the installation.
These boilers must be installed by qualified personnel only, in accordance
withthe legislation in force and following the manufacturer’s instructions.
Commissioning of these boilers and any maintenance operations must
only be carried out by DOMUSA TEKNIK’s Authorised Technical
AssistanceServices.
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
thelocal authority or the distributor where the purchase was made.

1
INDEX Page
1 LIST OF COMPONENTS.....................................................................................................................................................................4
2 CONTROL COMPONENTS................................................................................................................................................................5
3 INSTALLATION INSTRUCTIONS......................................................................................................................................................6
3.1LOCATION.............................................................................................................................................................................................6
3.2HYDRAULIC INSTALLATION..................................................................................................................................................................6
3.3INSTALLING A SANIT HOT WATER TANK (OPTIONAL)........................................................................................................................7
3.4FUEL ......................................................................................................................................................................................................7
3.5INSTALLING THE HOPPER .....................................................................................................................................................................8
3.6ELECTRICAL CONNECTION...................................................................................................................................................................9
3.7COMBUSTION PRODUCT REMOVAL.....................................................................................................................................................9
3.8BIOHYDRAULIC KIT INSTALLATION...................................................................................................................................................10
3.9INSTALLATION WITH A BTBUFFER TANK (OPTIONAL)....................................................................................................................11
3.10INSTALLATION WITH A BT-DUOBUFFER TANK (OPTIONAL).......................................................................................................15
4 COMMISSIONING OF THE BOILER...............................................................................................................................................17
4.1PRIOR WARNINGS ...............................................................................................................................................................................17
4.2ELECTRICAL CONNECTION.................................................................................................................................................................17
4.3FILLING THE INSTALLATION ...............................................................................................................................................................17
4.4INITIAL CALIBRATION OF THE FEED AUGER .......................................................................................................................................17
4.5COMMISSIONING................................................................................................................................................................................17
4.6INSTALLATION DELIVERY....................................................................................................................................................................18
5 DIGITAL DISPLAY..............................................................................................................................................................................19
6 OPERATION.........................................................................................................................................................................................22
6.1“ONLY HEATING”OPERATION ...........................................................................................................................................................22
6.2OPERATING WITH A SANIT DHWTANK (OPTION)..........................................................................................................................22
6.3BOILER TEMPERATURE SET POINT SELECTION...................................................................................................................................23
6.4DHWTEMPERATURE SET POINT SELECTION (WITH DHWTANK INSTALLED ONLY)......................................................................23
6.5SELECTING THE SETPOINT TEMPERATURE OF THE BUFFER TANK (ONLY WITH BUFFER TANK).......................................................24
6.6FUNCTIONING ACCORDING TO OUTDOOR TEMPERATURE CONDITIONS OTC(OPTION).............................................................24
7 OPERATING WITH BIO HYDRAULIC KITS (OPTIONAL)..........................................................................................................25
8 OPERATION WITH A BT BUFFER TANK (OPTIONAL).............................................................................................................26
8.1OPERATION WITH A TEMPERATURE SENSOR IN THE BTBUFFER TANK (P.08=1OR 2)................................................................26
8.2OPERATION WITH A CONTROL THERMOSTAT IN THE BTBUFFER TANK (P.08=3OR 4)..............................................................27
9 OPERATION WITH A BT-DUO BUFFER TANK (OPTIONAL)..................................................................................................28
10 OPERATING WITH LAGO FB OT+ REMOTE CONTROL (OPTIONAL)...............................................................................29
11 USER MENU......................................................................................................................................................................................30
11.1ASHTRAY STATUS.............................................................................................................................................................................31
12 SETUP MENU....................................................................................................................................................................................32
12.1TIMERS PROGRAMMING PROCESS...................................................................................................................................................33
12.2BOILER TIMER PROGRAMMING........................................................................................................................................................33
12.3DHWRECIRCULATION FUNCTION TIMER PROGRAMMING (DHWTANK OPTION ONLY)............................................................33
12.4TIME SETTING ...................................................................................................................................................................................34
12.5ASHTRAY EMPTY WARNING FUNCTION ..........................................................................................................................................35
12.6MANUAL SETTING OF FEED AUGER CALIBRATION..........................................................................................................................35
12.7SCREEN CONTRAST SETTING............................................................................................................................................................35
13 CALIBRATION MENU.....................................................................................................................................................................36
13.1FEED AUGER FILLING........................................................................................................................................................................37
13.2FEED AUGER CALIBRATION..............................................................................................................................................................38
13.3MANUAL SETTING OF FEED AUGER CALIBRATION..........................................................................................................................39
13.4MANUAL ASH CLEANING ACTIVATION............................................................................................................................................39
13.5MANUAL CIRCULATION PUMPS ACTIVATION .................................................................................................................................39
14 TECHNICAL MENU.........................................................................................................................................................................39
14.1ENTRY AND SET THE ACCESS CODE ("COD",P.25)........................................................................................................................42

BioClass TR
2
15 BOILER'S SETUP PARAMETERS...................................................................................................................................................43
15.1BOILER MODEL (P.01)....................................................................................................................................................................43
15.2BOILER HEAT OUTPUT (P.02,P.03)...............................................................................................................................................43
15.3GENERAL FAN SPEED FACTOR (P.04).............................................................................................................................................43
15.4FUEL FOR IGNITION (P.05)..............................................................................................................................................................43
15.5FUEL CONSUMPTION (P.06)...........................................................................................................................................................43
15.6FUEL TYPE (P.07).............................................................................................................................................................................43
15.7MANAGING BTAND BT-DUOBUFFER TANKS (P.08,P.28)........................................................................................................44
15.8AUXILIARY PARAMETER FOR FUEL SELECTION (P.26)...................................................................................................................44
15.9BOILER MINIMUM TEMPERATURE MODE (P.13,P.14)..................................................................................................................44
16 HEATING CIRCUIT'S SETUP PARAMETERS..............................................................................................................................44
16.1HEATING PUMP POST-CIRCULATION TIME (P.15).........................................................................................................................44
16.2BOILER'S PUMP OPERATING MODE (P.18).....................................................................................................................................45
16.3MINIMUM BOILER WATER PRESSURE (P.19)..................................................................................................................................45
16.4MAXIMUM HEATING FLOW TEMPERATURE OF MIXED CIRCUITS (P.27).......................................................................................45
17 DHW CIRCUIT'S SETUP PARAMETERS.....................................................................................................................................45
17.1DHWINSTALLATION MODE (P.09)................................................................................................................................................45
17.2DHWPUMP POST-CIRCULATION TIME (P.16)...............................................................................................................................45
17.3LEGIONELLA PROTECTION FUNCTION (P.17).................................................................................................................................46
17.4DHWRE-CIRCULATION FUNCTION (P.20=2) .............................................................................................................................46
18 ADDITIONAL FUNCTIONS...........................................................................................................................................................46
18.1RESET DEFAULT VALUES (P.24)......................................................................................................................................................46
18.2PUMPS ANTI-LOCK FUNCTION.........................................................................................................................................................46
18.3ANTI-FROST FUNCTION....................................................................................................................................................................46
18.4BOILER PRESSURE SENSOR FUNCTION ............................................................................................................................................46
18.5CONNECTING THE LAGOFBOT+REMOTE CONTROL.................................................................................................................46
18.6ROOM THERMOSTAT CONNECTION ................................................................................................................................................47
19 MULTI-FUNCTIONAL RELAY (P.20)...........................................................................................................................................47
19.1BOILER ALARMS EXTERNAL SIGNAL (P.20=1).............................................................................................................................47
19.2DHWRE-CIRCULATION FUNCTION (P.20=2) .............................................................................................................................47
19.3AUTOMATIC WATER FILLING FUNCTION (P.20=3)......................................................................................................................48
20 CLEANING THE ASH DRAWER....................................................................................................................................................49
20.1SAFETY WARNINGS:.........................................................................................................................................................................49
21 SAFETY LOCK-OUTS......................................................................................................................................................................50
21.1WATER OVERHEAT SAFETY LOCK-OUT (E-11)...............................................................................................................................50
21.2FUEL ENTRANCE TUBE OVERHEAT SAFETY CUT-OUT (E-05).........................................................................................................50
21.3LOW PRESSURE LOCK-OUT..............................................................................................................................................................51
22 SHUTTING DOWN THE BOILER..................................................................................................................................................51
23 EMPTYING THE BOILER................................................................................................................................................................51
24 BOILER MAINTENANCE................................................................................................................................................................52
24.1FREQUENCY OF MAINTENANCE OF THE BOILER AND CHIMNEY ....................................................................................................52
24.2BURNER CLEANING PROCEDURE .....................................................................................................................................................53
24.3HEAT EXCHANGER CLEANING PROCEDURE....................................................................................................................................54
24.4DRAINING THE CONDENSATE WATER .............................................................................................................................................55
24.5BOILER WATER CHARACTERISTICS...................................................................................................................................................55
25 DIAGRAMS AND MEASUREMENTS...........................................................................................................................................56
26 CONNECTIONS DIAGRAM...........................................................................................................................................................59
26.1BOILER ..............................................................................................................................................................................................59
26.2BURNER.............................................................................................................................................................................................60
27 ELECTRICAL DIAGRAM.................................................................................................................................................................61
28 TECHNICAL DATA..........................................................................................................................................................................62
29 CIRCULATION PUMP AND PRESSURE DROP.........................................................................................................................63
29.1CONVENTIONAL PUMP ....................................................................................................................................................................63
29.2HIGH EFFICIENCY CIRCULATION PUMP ...........................................................................................................................................63

3
30 SPARE PARTS LIST..........................................................................................................................................................................65
31 ALARM CODES................................................................................................................................................................................73
32 GUARANTEE CONDITIONS..........................................................................................................................................................76

BioClass TR
4
1LISTOF COMPONENTS
1 2 3 4 5
6
7
8
9
13
12
11
10
1.Feedauger.
2.Sensorhousing.
3.AutomaticAir vent.
4.Flueoutlet
5.Fan.
6.Heatexchanger cleaning system.
7.Waterpressure sensor.
8.Fuelentrance safety thermostat.
9.Heatexchanger.
10.Ashdrawer.
11.Burner.
12.Airpressure sensor.
13.Peephole.

5
2CONTROLCOMPONENTS
17 18 20
16
19
1514
14. MENU touch button:
This button is used to access and browse
throughthe "User Menu".
15. Digital display:
It 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. RESET touch button:
This button is used to restore functioning of the
boiler after a lock-out situation. Also it is used to
exit from any of the menus or parameters of the
boiler without saving it and to return to the
previousmenu level.
17. ON touch button:
Thisbutton switches on and off the boiler.
18. Boiler temperature touch button:
This button is used to select the boiler set point
temperature. It is also used to disable the hot
waterfunction.
19. DHW temperature touch button:
This button is used to select the desired
domestic hot water set point temperature (only
if a DHW tank is connected to the boiler). It is
alsoused to disable the DHW function.
20. SET touch button:
This button is used to access and browse
through the "Setup menu". Touch this button to
accessthe settings options.

BioClass TR
6
3INSTALLATIONINSTRUCTIONS
The boiler must be installed by personnel authorised by the Ministry of Industry, in compliance with
theapplicable laws and regulations.
This boiler is suitable for heating water to a temperature below boiling point at atmospheric pressure.
It must be connected to a heating installation and/or a domestic hot water distribution network,
whichmust always be compatible with its performance and power.
This appliance must only be used for the purpose for which it has been expressly designed. Any other
use is considered unsuitable and therefore hazardous. The manufacturer shall not be considered liable
under any circumstances for damagecaused by unsuitable,erroneous or irrational use.
Remove all the packaging and check the contents are complete. In case of doubt, do not use the
boiler. Contact your supplier. Keep the packaging elements out of reach of children, as they can be
dangerous.
When you no longer wish to use the boiler, disable the parts that could be a potential source of
hazard.
3.1 Location
The boiler must be installed in a sufficiently ventilated site, away from humidity. It must be located
so that the air grilles on the premises are not obstructed and normal boiler maintenance is possible
even if it is placed between items of furniture. One metre of free space must be left above the boiler
forthis purpose.
3.2 Hydraulic installation
The hydraulic installation must be made by qualified personnel. The applicable installation
legislation is to be complied with, and the following recommendations should also be taken into
account:
- The inside of the installation piping should be thoroughly cleaned before switching on the
boiler.
- We recommend inserting cut-off valves between the installation piping and the boiler to
simplifymaintenance tasks.
- Leavea free space around the boiler for carrying out any maintenanceand repair operations.
- Drain valves and suitable devices for correctly bleeding the air from the circuit during the boiler
fillingstage should be fitted.
- Install all the necessary safety elements (expansion vessel, safety valve, etc.) to comply with the
applicableregulations for the installation.
- If the boiler is installed at a lower height than the heating installation, it is recommendable to
create a siphon at the boiler outlet, to prevent the installation from heating up due to natural
convectionwhen heating is not required.

7
3.3 Installing a Sanit hot water tank (Optional)
For a correct electrical connection of a Sanit DHW hot water tank with BioClass TR boiler, these
stepsshould be followed:
- Unplug the boiler from the mains power.
- Connect a DHW temperature sensor (supplied optionally) to the sensor terminal strip J7 (Sa;
terminals16 and 17) (see " ConnectionsDiagram ").
- Insertthe temperature sensor bulb in the bulb-holder sheath provided on thehot water tank.
- Connect the 3-way DHW diverter valve or the hot water tank booster pump (depending on the
installation, modify parameter P.09) to the supply terminal strip J3 (BA; terminals 6and N) (see
" ConnectionsDiagram ").
The hydraulic installation for the 3-way DHW diverter valve should be made so that the heating
circuitcan flow through the valve when it is in rest position(not energised):
HEATING
BOILER
D.H.W.
NC
V3V (BA)
OPTIÓN WITH V3V
HEATING (BC)
BOILER
OPTIÓNWITH 2 PUMP CIRCULATION
D.H.W. (BA)
(BA)
NO
For correct hydraulic installation of the hot water tank, carefully follow the assembly and
connectioninstructions enclosed with the same.
3.4 Fuel
BioClass TR boiler must be fuelled by fuel where humidity levels and calorific value are ideal for
optimum boiler functioning. If this requirement is not complied with, DOMUSA TEKNIK’s guarantee of
theappliance will automatically be null and void.
Thefollowing points should be taken into account for correct fuel storage:
- Thestored fuel should be kept dry all year round.
- Theapplicable legislation in each country for correct fuel storage must becomplied with.

BioClass TR
8
3.5 Installing the hopper
DOMUSA TEKNIK supplies a hopper for storing the fuel with the boiler. The tank is reversible and
can be mounted on either the left or right side of the boiler. It is also equipped with adjustable feet
forheight regulation.
2 31
5
7a
6
7b 8
4
IMPORTANT: Ensure the height of the elliptical holes on the sides of the boiler and on the
hopper coincide, for correct insertion of the feed auger. To do this, make the
necessary adjustments for height (using the adjustment feet) and depth
(correctly positioning the hopper).

9
3.6 Electrical Connection
The boiler is equipped for connection at 230 V~, 50 Hz using the power cable. The socket should
have an appropriate earth connection.
The boiler has a strip TA1(J6), prepared for connecting a room thermostat or room
chronothermostat (see Electrical Connection Diagram ) for remote control of the heating circuit. To
correctly connect theroom thermostat, removethe bridge joining theterminals on thestrip TA1.
The terminal strip J2 includes terminals for connecting the feed auger, whereas the terminal strip J3
includes terminals for connecting the circulation pump of the boiler (BC) and the 3-way diverter
valve (or circulation pump) for the optional DHW circuit. The terminal strip J7 includes terminals for
connecting a sensor for the optional DHW circuit. This sensor must be supplied by DOMUSA
TEKNIK.
IMPORTANT: Before carrying out any work on the boiler's electrical installation, always ensure
it is disconnected from the mains.
3.7 Combustion product removal
BioClass TR boiler is a biomass boiler and it is essential for it to be connected to a flue, i.e. a smoke
duct able to create a pressure drop (which in this case should be between 0.10 and 0.20 mbar), in
compliancewith the applicable laws to this regard.
The combustion product exhaustion ducts must be installed by qualified personnel and must
comply with the regulations in force. For the flue to create a pressure drop, the following
recommendationsshould be taken into account:
- Itshould be suitably insulated.
- Itshould be independently located, with a separate flue for each boiler.
- Itshould be vertical, avoiding any angles greater than 45º.
- It should always have the same diameter. It is recommendable for it to be circular, and never
anynarrower than the boiler outlet.
- It is obligatory to install a fume inspection plate with condensation collection, to remove
the condensation generated in the flue. Otherwise, the condensation may reach the inside of
the boiler and cause irreparable damage, which would not be covered by DOMUSA TEKNIK’s
guarantee. The condensation pipe should lead to a drain outlet, as a large amount of water
may be generated. This connection must be made in compliance with the regulations for
draining off condensation waterto the drain network.
- It is recommended to install a draught stabiliser to prevent any pressure drop variations in
the flue due to atmospheric conditions, which could affect correct boiler combustion. This
draught stabiliser must be installed below the fume inspection plate to prevent any
leakage of combustion gases.

BioClass TR
10
3.8 BIO hydraulic kit installation
In option a BIO hydraulic kit, within the kits range offered by DOMUSA TEKNIK, could be
connectedto BioClass TR boiler. In that way thefeaturesof the boiler will be increased.
Lookat the following instructions for a correct installation:
-Unplug the boiler and the hydraulic kit from the main power supply.
- Connect the communication between the boiler and BIO hydraulic kit. Use the cable of two
wires with two connectors (+A –B) supplied with the kit (documentation bag). To assure the
correct running of BIO hydraulic Kit it is essential to respect the polarity of the connection.
The same wire must be connected to the +A terminal of the boiler as well as to the +A
terminal of the hydraulic Kit. Same operation with the –B terminals as it is shown in the
picture below.
- After connecting the communication between the boiler and the hydraulic Kit, plug the BIO
hydraulic Kit to the main power supply. It is recommended to plug the Kit before the boiler to
assurea correct running of the system.
-Plug the boiler to the main power supply.
Followthe instructions provided with the kit to assure a correct installation.
IMPORTANT: It is compulsory to respect the polarity of both wires of the cable to assure a
correct running of BIO hydraulic Kit.
NOTE: It is recommended to plug the kit before the boiler to assure a correct running.

11
3.9 Installation with a BT Buffer Tank (Optional)
The BioClass TR boiler can be accompanied by a BT Buffer Tank during the installation from the
wide range offered by DOMUSA TEKNIK, which may increase the benefits provided by the boiler in
theheating service.
For this reason, the electronic control of the boiler is equipped with an input for a temperature
sensor or a temperature thermostat (Sbt; terminals 18-19 on connection strip J7) and a circulation
pump output (Bbt; terminals N-7 on the connection strip J2) dedicated exclusively to managing the
heating of the buffer tank. Using these control elements of the boiler you will be able to manage 4
different modes of buffer tank hydraulic installation. The installation type will be selected using
parameterP.08 in the "Technician" menu on the control panel.
The boiler is supplied with this installation option disabled. To enable it, the electrical resistance
(Rbt) connected between terminals 18 and 19 of connection strip J7 (see "Connection Diagram")
must be disconnected and replaced with a temperature sensor (supplied as an option by DOMUSA
TEKNIK) or a control thermostat installed in the BT buffer tank. After disconnecting the resistance in
the "Technician" menu of the control panel, parameter P.08 must be enabled, via which you can
selectthe installation mode desired.
The following sections describe in detail the hydraulic and electrical connection characteristics for
eachinstallation mode.
3.9.1 Installation with Sanit DHW tank after BT tank and control by temperature sensor (P.08 = 1)
In this installation mode, all heating circuits, as well as the circuit for producing DHW by
accumulation, if present, must be hydraulically connected to the BT buffer tank. In other words, as
shown in the following hydraulic diagram, the BT buffer tank is connected to the boiler, interposing
a circulation pump (Bbt), and all the heating circuits of the system are connected to the BT tank.
The temperature of the BT tank is controlled and managed by a temperature sensor (Sbt) immersed
in the buffer tank and electrically connected to the boiler. The temperature sensor is optionally
suppliedby DOMUSA TEKNIK.
Heating
Installation +
DHW
After the hydraulic installation of all the system components, proceed as follows to carry out the
correct electricalconnection of theBT buffer tankto the BioClass TR boiler:
- Unplug the boiler from the mains power.
- Disconnect the electrical resistance (Rbt) connected between terminals 18 and 19 of
connectionstrip J7
(see"Connection Diagram") .
- Connect the BT tank temperature sensor (supplied optionally) to the sensor connection strip J7
(Sbt; terminals 18and 19)
(see"Connection Diagram") .
- Insertthe temperature sensor bulb in the bulb-holder sheath provided in thebuffer tank.

BioClass TR
12
- Connect the BT tank feed pump to the component connection strip J2 (Bbt; terminals Nand 7)
(see"Connection Diagram") .
- Connectthe boiler to the mains power.
- Using the control panel, access parameter P.08 in the "Technician" menu (see "Technician
Menu") and set the value to "1".
- After that, ifit is necessary,set also theparameter P.28 "BT buffertank temperature hysteresis".
Once the hydraulic and electrical connection described above has been completed, to adjust and
configure the BT buffer tank operation, carefully read the section "Operation with a BT buffer tank"
inthis manual.
3.9.2 Installation with Sanit DHW tank before BT tank and control by temperature sensor
(P.08 = 2)
In this installation mode, all heating circuits must be hydraulically connected to the BT buffer tank,
and the circuit for producing DHW by accumulation should be hydraulically connected to the
boiler, upstream from the BT buffer tank. In other words, the BT buffer tank and the Sanit DHW tank,
if present, are connected in parallel to the boiler. Depending on the type of installation of the DHW
tank (installation with DHW diverter valve or with a DHW pump), the BT tank feed pump (Bbt) will
be installed as indicated in the following hydraulic diagrams. The temperature of the BT tank is
controlled and managed by a temperature sensor (Sbt) immersed in the buffer tank and electrically
connectedto the boiler. The temperature sensor is optionally supplied by DOMUSATEKNIK.
Heating
Installation
DHW diverter valve
Heating
Installation
DHW pump
After the hydraulic installation of all the system components, proceed as follows to carry out the
correct electricalconnection of theBT buffer tankto the BioClass TR boiler:
- Unplug the boiler from the mains power.
- Disconnect the electrical resistance (Rbt) connected between terminals 18 and 19 of
connectionstrip J7 (see"Connection Diagram") .

13
- Connect the BT tank temperature sensor (supplied optionally) to the sensor connection strip J7
(Sbt; terminals 18and 19) (see"Connection Diagram") .
- Insertthe temperature sensor bulb in the bulb-holder sheath provided in thebuffer tank.
- Connect the BT tank feed pump to the component connection strip J2 (Bbt; terminals Nand 7)
(see"Connection Diagram") .
- Connectthe boiler to the mains power.
- Using the control panel, access parameter P.08 in the "Technician" menu (see "Technician
Menu") and set the value to "2".
- After that, ifit is necessary,set also theparameter P.28 "BT buffertank temperature hysteresis".
For the correct hydraulic and electrical installation of a Sanit DHW tank with a BioClass TR boiler,
carefullyfollow the directions in the section "Installinga Sanit tank" in this manual.
Once the hydraulic and electrical connection described above has been completed, to adjust and
configure the BT buffer tank operation, carefully read the section "Operation with a BT buffer tank"
inthis manual.
3.9.3 Installation with Sanit DHW tank after BT tank and control by thermostat (P.08 = 3)
In this installation mode, all heating circuits, as well as the circuit for producing DHW by
accumulation, if present, must be hydraulically connected to the BT buffer tank. In other words, as
shown in the following hydraulic diagram, the BT buffer tank is connected to the boiler, interposing
a circulation pump (Bbt), and all the heating circuits of the system are connected to the BT tank.
The temperature of the BT tank is controlled and managed by a thermostat (Tbt) installed and
immersed in the buffer tank and electrically connected to the boiler. The temperature control
thermostat is not supplied by DOMUSA TEKNIK but can be purchased at any specialist central
heatingsupplies warehouse.
Heating
Installation +
DHW
After the hydraulic installation of all the system components, proceed as follows to carry out the
correct electricalconnection of theBT buffer tankto the BioClass TR boiler:
- Unplug the boiler from the mains power.
- Disconnect the electrical resistance (Rbt) connected between terminals 18 and 19 of
connectionstrip J7 (see"Connection Diagram") .
- Connect the NC contact (normally closed) on the BT tank control thermostat on the sensor
connectionstrip J7 (Sbt; terminals 18 and 19) (see"Connection Diagram") .
- Insertthe thermostat bulb into the bulb-holder sheath provided in the buffertank.
- Connect the BT tank feed pump to the component connection strip J2 (Bbt; terminals Nand 7)
(see"Connection Diagram") .
- Connectthe boiler to the mains power.

BioClass TR
14
- Using the control panel, access parameter P.08 in the "Technician" menu (see "Technician
Menu") and set the value to "3".
Once the hydraulic and electrical connection described above has been completed, to adjust and
configure the BT buffer tank operation, carefully read the section "Operation with a BT buffer tank"
inthis manual.
3.9.4 Installation with Sanit DHW tank before BT tank and control by thermostat (P.08 = 4)
In this installation mode, all heating circuits must be hydraulically connected to the BT buffer tank,
and the circuit for producing DHW by accumulation should be hydraulically connected to the
boiler, upstream from the BT buffer tank. In other words, the BT buffer tank and the Sanit DHW tank,
if present, are connected in parallel to the boiler. Depending on the type of installation of the DHW
tank (installation with DHW diverter valve or with a DHW feed pump), the BT tank feed pump (Bbt)
will be installed as indicated in the following hydraulic diagrams. The temperature of the BT tank is
controlled and managed by a thermostat (Tbt) installed and immersed in the buffer tank and
electrically connected to the boiler. The temperature control thermostat is not supplied by
DOMUSATEKNIK but can be purchased at any specialist central heating supplieswarehouse.
Heating
Installation
DHW diverter valve
Heating
Installation
DHW pump
After the hydraulic installation of all the system components, proceed as follows to carry out the
correct electricalconnection of theBT buffer tankto the BioClass TR boiler:
- Unplug the boiler from the mains power.
- Disconnect the electrical resistance (Rbt) connected between terminals 18 and 19 of
connectionstrip J7 (see"Connection Diagram") .
- Connect the NC contact (normally closed) on the BT tank control thermostat on the sensor
connectionstrip J7 (Sbt; terminals 18 and 19)
(see"Connection Diagram") .
- Insertthe thermostat bulb into the bulb-holder sheath provided in the buffertank.
- Connect the BT tank feed pump to the component connection strip J2 (Bbt; terminals Nand 7)
(see"Connection Diagram") .
- Connectthe boiler to the mains power.

15
- Using the control panel, access parameter P.08 in the "Technician" menu (see "Technician
Menu") and set the value to "4".
For the correct hydraulic and electrical installation of a Sanit DHW tank with a BioClass TR boiler,
carefullyfollow the directions in the section "Installinga Sanit tank" in this manual.
Once the hydraulic and electrical connection described above has been completed, to adjust and
configure the BT buffer tank operation, carefully read the section "Operation with a BT buffer tank"
inthis manual.
3.10 Installation with a BT-DUO buffer tank (Optional)
The BioClass TR boiler can be accompanied by a BT-DUO Buffer Tank during the installation from
the wide range offered by DOMUSA TEKNIK, which may increase the benefits provided by the boiler
in the heating service. This tank has a hot water storagetank inside, thereby adding the provision of
DHW in addition to the buffer tank functionality. For this reason, its connection to the boiler as well
asits operating configuration are specific.
For this reason the electronic control of the boiler is equipped with an input for connecting the
primary control thermostat Tcp of the BT-DUO tank (input Sbt; terminals 18-19 on connection strip
J7) and a circulation pump output (Bbt; terminals N-7 on the connection strip J2) dedicated
exclusively to managing the heating of the buffer tank. Also, for correctly managing the DHW
production in the tank integrated in the BT-DUO tank, a DHW temperature sensor (supplied
optionally)must be included in the installation.
The boiler is supplied with this installation option disabled. To enable it, the electrical resistance
(Rbt) connected between terminals 18 and 19 of connection strip J7 (see "Connection Diagram")
must be disconnected and replaced with a temperature sensor (supplied as an option by DOMUSA
TEKNIK) or a control thermostat installed in the BT buffer tank. After disconnecting the resistance in
the "Technician" menu of the control panel, parameter P.08 must be enabled, via which you can
selectthe installation mode and appropriate functioning for this type of buffertank.
The BT-DUO buffer tank is hydraulically connected to the boiler, interposing a circulation pump
(Bbt), and all the central heating circuits of the system are connected to the BT-DUO tank. For the
correct hydraulic installation of the BT-DUO tank and the feed pump Bbt, carefully follow the
instructionsin the following hydraulic diagram:
Heating
Installation
After the hydraulic installation of all the system components, proceed as follows to carry out the
correct electricalconnection ofthe BT-DUO buffertank tothe BioClass TR boiler:
- Unplug the boiler from the mains power.
- Disconnect the electrical resistance (Rbt) connected between terminals 18 and 19 of
connectionstrip J7 (see"Connection Diagram") .

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- Using a 2-wire electrical hose connect the TAcald terminals (terminals 7and 8in the wiring
diagram of the BT-DUO tank manual) of the BT-DUO tank control thermostat (Tcp) to the
sensor connection strip J7(Sbt; terminals 18 and 19) (see"Connection Diagram") .
- Connect the DHW temperature sensor (supplied optionally) to the sensor connection strip J7
(Sa; terminals 16 and 17) (see "Connection Diagram") , previously removing the resistance Ra,
suppliedas standard with the boiler.
- Insert the DHW temperature sensor bulb into the bulb-holder sheath provided in the DHW tank
ofthe BT-DUO buffer tank.
- Connect the BT-DUO tank feed pump to the component connection strip J2 (Bbt; terminals N
and7)
(see"Connection Diagram") .
- Connectthe boiler to the mains power.
- To correctly configure the type of installation you must adjust parameters P.08 y P.09 in the
"Technician" menu on the control panel. Access parameter P.08 in the "Technician" menu (see
"Technician Menu")
and set the value to "4". Next, access parameter P.09 from the same menu
andset the value to "0".
For the correct hydraulic and electrical installation of a BT-DUO buffer tank, carefully follow the
instructionsin the manual supplied with it.
Once the hydraulic and electrical connection described above has been completed, to adjust and
configure the BT-DUO buffer tank operation, carefully read the section "Operation with a BT-DUO
buffertank" in this manual.

17
4COMMISSIONINGOF THE BOILER
4.1 Prior warnings
Repair and maintenance of the boiler must be carried out by a qualified professional, authorised by
DOMUSA TEKNIK. For optimum functioning and conservation of the boiler, it should be serviced
annually.
Carefully read this instruction manual and keep it in a safe, easily-accessible place. DOMUSA
TEKNIK willnot be liable for any damages caused by failure to followthese instructions.
Before any servicing, disconnect the boiler from the mains.
4.2 Electrical Connection
BioClass TR boileris supplied with a mains connectionplug.
4.3 Filling the installation
The hydraulic installation must include a fill valve, drain valves and the necessary hydraulic
componentsfor correctly filling the installation.
To fill the installation, open the fill valve until the parameter “Water pressure” of “User Menu” shows
a pressure of 1 - 1.5 bars. The installation must be filled slowly, bleeding the air from the water
circuitusing the drain valves provided on the same. Close the fillvalve after filling.
BioClass TR boilers have a pressure sensor for controlling the pressure of the installation. If the
installation does not have the minimum pressure set at P.19 parameter of ”Technical Menu” (by
default0.5 bar), a low pressure alarm will appear ("E-19").
IMPORTANT: Switching on the boiler with no water inside could result in serious damage.
4.4 Initial calibration of the feed auger
BioClass TR boiler is equipped with a feed auger to supply the fuel. Follow the instructions
described in "Installing the hopper” section to install it correctly. Due to diversity of feed augers and
the range of different hoppers, it is needed to calibrate the feed auger minimum twice to assure the
correctrunning.
During the commissioning, after filling the installation, ("E-25") alarm code is displayed. It isn’t
possible to switch on the boiler before calibrating the feed auger. Follow the instructions described
in “
Feed auger calibration” section of “Setup menu” to assure a correct calibration. Once the
calibrationis finished, "E-25") alarm would disappear and it will be possible to switchon the boiler.
4.5 Commissioning
In order for the guarantee to be valid, the boiler must be commissioned by personnel authorised
by DOMUSA TEKNIK.Before beginning the commissioning, the following must be complied with:
-The boiler must be plugged in to the mains.
-The installation must be filled with water (the pressure mustbebetween 1 and 1.5 bar).
-The hopper must be filled with fuel.
Thecommissioning sequence is as follows:

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- Check the flue is correctly installed using a condensation inspection tap and a draught
stabiliser.
- Check the hopper and the feed auger are correctly installed. The feed auger must be
calibrated for a correct boiler functioning (See “Calibrating the feed auger” ). Check the right
typeof fuel is being used.
-If the installation has flow and return valves, check they areopen.
4.6 Installation delivery
After commissioning, the Technical Assistance Service will explain to the user how the boiler
functions,making any observations they consider relevant.
The installer is responsible for clearly explaining to the user the functioning of any control or
regulationdevice forming part of the installation but not supplied with theboiler.