Logotherm LambdaControl 2 BSB User manual

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Index
1Introduction ....................................................................................................................5
1.0 Abbreviations and technical terms ............................................................................................................. 5
1.1 Display and operating element................................................................................................................... 6
1.2 Function display......................................................................................................................................... 7
1.3 AFO: Fire Optimisation............................................................................................................................... 7
1.4 KLA: Reduced Boiler Output ....................................................................................................................... 7
1.5 AAO: Combustion and Burnout Optimisation.............................................................................................. 8
1.6 RSA: Rapid System Heating ........................................................................................................................ 8
1.7 SLA: Peak Load Coverage............................................................................................................................ 8
1.8 PAE: Accumulator Run-up Easing................................................................................................................ 9
1.9 Residual Heat Use.....................................................................................................................................10
1.10 RWO: Residual Heat Optimisation .............................................................................................................10
1.11 BSB: Basic Principles .................................................................................................................................11
1.12 BSB: Fuel Calculation without heating demand..........................................................................................11
1.13 BSB: Fuel calculation with heating demand................................................................................................11
1.14 BSB: ABO –Burning Demand Optimisation ................................................................................................12
1.15 Minimum Flue gas Temperature................................................................................................................12
1.16 Refuel signal without BSB .........................................................................................................................13
1.17 Refuel signal with BSB - Heating date Calculation ......................................................................................13
1.18 Integrated fuel types.................................................................................................................................14
1.19 Water content –moisture content of fuel..................................................................................................15
1.20 Refuel amount..........................................................................................................................................15
1.21 Energy content and usable energy content of the fuel ...............................................................................15
1.22 Protective functions for the boiler/ pumps –valve stuck protection...........................................................16
2Commissioning ..............................................................................................................17
2.1 Safety instructions for initial system operation..........................................................................................17
2.2 Minimum requirements for a trial run or heating test................................................................................17
2.3 Technician password.................................................................................................................................18
2.4 Commissioning settings ............................................................................................................................18
2.5Changes to system settings .......................................................................................................................22
3Important notes for heating ..........................................................................................23
3.1 Opening door(s) and firing ........................................................................................................................23
3.2 Refuelling in operating status “Boiler ON” .................................................................................................23
3.3 Flue gas temperature too high ..................................................................................................................23
3.4 Safety shutdown.......................................................................................................................................24
3.5 Service program: “Small service” and “Large service” ................................................................................24
3.6 Type of wood - Moisture - Change refuel amount ......................................................................................25
3.7 Operation display: “Boiler ON” / “Boiler OFF”............................................................................................26
4Wood Boiler ..................................................................................................................27
4.1 Information ..............................................................................................................................................27
4.1.1 Operating data .................................................................................................................................................................. 27
4.1.2 Operations counter ........................................................................................................................................................... 28
4.1.3 Aggregate Wood Boiler display......................................................................................................................................... 30
4.1.4 Commissioning data display.............................................................................................................................................. 31
4.1.5 Display last error / delete last error.................................................................................................................................. 31
4.1.6 Display last note / delete last note ................................................................................................................................... 32
4.1.7 Delete values..................................................................................................................................................................... 32
4.2 Settings ....................................................................................................................................................33
4.2.1 Wood settings ................................................................................................................................................................... 33
4.2.2 BSB settings....................................................................................................................................................................... 34
4.2.3 Display............................................................................................................................................................................... 35
4.2.4 Initial settings .................................................................................................................................................................... 35
4.3 Chimney sweep test..................................................................................................................................38

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4.3.1 Example: Select Chimney sweep: Rated power ................................................................................................................ 39
4.4 Calibrate O2Sensor ...................................................................................................................................39
4.4.1 Manual calibration ............................................................................................................................................................ 39
4.4.2 Automatic calibration........................................................................................................................................................ 39
4.5 Aggregate test ..........................................................................................................................................40
5Accumulator ..................................................................................................................42
5.1 Logotherm conform sensor positioning .....................................................................................................43
5.2 Information ..............................................................................................................................................44
5.3 Settings ....................................................................................................................................................45
5.4 Aggregate test ..........................................................................................................................................46
6Hot water tank ..............................................................................................................47
6.1 Information ..............................................................................................................................................47
6.2 Operation mode .......................................................................................................................................48
6.3 Settings ....................................................................................................................................................48
6.4 Reloading ................................................................................................................................................50
6.5 Aggregate test ..........................................................................................................................................50
7Heating circuit 1(2) ........................................................................................................51
7.1 Information ..............................................................................................................................................51
7.2 Operation mode .......................................................................................................................................52
7.3 Pump switch-off (ECO) ..............................................................................................................................53
7.4 Heating times ...........................................................................................................................................54
7.5 Holiday.....................................................................................................................................................55
7.6 Settings ....................................................................................................................................................55
7.7 Remote Control Panel...............................................................................................................................59
7.8 Aggregate test ..........................................................................................................................................60
7.9 Remote control panel WRS 2000 ...............................................................................................................61
8Date and time................................................................................................................61
9DCF77- Receiver.............................................................................................................62
9.1 Information ..............................................................................................................................................62
9.2 Settings ....................................................................................................................................................62
10 Solar system ..................................................................................................................63
10.1 Information ..............................................................................................................................................64
10.2 Operation mode .......................................................................................................................................64
10.3 Settings ....................................................................................................................................................65
10.4 Aggregate test ..........................................................................................................................................66
10.5 Simplified diagrams, 2-circuit system / Principle 1 / 2(3) ............................................................................67
11 Electric load circuit ........................................................................................................68
11.1 Other application possibilities of the E-load circuit ....................................................................................68
11.1 Information ..............................................................................................................................................70
11.2 Operation mode .......................................................................................................................................70
11.3 Settings ....................................................................................................................................................71
11.4 Aggregate test ..........................................................................................................................................71
12 Heating element............................................................................................................72
12.1 Information ..............................................................................................................................................72
12.2 Operation mode .......................................................................................................................................72
12.3 Settings ....................................................................................................................................................73
12.3 Aggregate test ..........................................................................................................................................73
13 Pellet/Oil/Gas boiler......................................................................................................74
13.1 Information ..............................................................................................................................................74
13.2 Operation mode .......................................................................................................................................75
13.3 Settings ....................................................................................................................................................76
13.4 Chimney sweep ........................................................................................................................................77

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13.5 Aggregate test ..........................................................................................................................................78
14 System operation mode.................................................................................................79
14.1 Operation mode .......................................................................................................................................79
14.2 Holiday.....................................................................................................................................................79
14.3 Summer operation....................................................................................................................................80
15 Errors - Notes.................................................................................................................81
Note 1.16: Protective functions ............................................................................................................................81
Error 1.17: Ext.-1 HC BUS-Communication ............................................................................................................81
Error 1.18: Ext.-Ignition BUS-Communication........................................................................................................81
Error 2.30: Ignition failed .....................................................................................................................................82
Error 2.31: Ignition error ......................................................................................................................................82
Error 26.01: Memory error (EE-Prom)...................................................................................................................82
Error 26.02: Program surveillance (watchdog) ......................................................................................................82
Error 26.03: Voltage reference .............................................................................................................................82
Error 26.04: Base point control.............................................................................................................................83
Error 26.05: ADC (Analogue/digital converter) ......................................................................................................83
Error 26.06: Sensor not connected........................................................................................................................83
Error 26.07: Water shortage fuse activated...........................................................................................................84
Error 26.08: STB triggered ....................................................................................................................................84
Error 26.09: Boiler sensor.....................................................................................................................................85
Error 26.10: Actuator V1 ......................................................................................................................................85
Error 26.11: Actuator V2 ......................................................................................................................................85
Error 26.13: O2Sensor..........................................................................................................................................86
Error 26.14: O2Sensor..........................................................................................................................................86
Error 26.15: O2Sensor..........................................................................................................................................87
Error 26.17: O2Sensor..........................................................................................................................................87
Error 26.18: O2Sensor..........................................................................................................................................88
Error 26.19: O2Sensor..........................................................................................................................................88
Note 26.21: Overtemperature ..............................................................................................................................89
Error 26.22: Flue gas sensor..................................................................................................................................89
Error 26.23: Return sensor ...................................................................................................................................90
Error 26.24: Date –Time not set...........................................................................................................................90
Error 26.25: DCF77-Receiver No reception ............................................................................................................91
Error 26.26: Outside sensor..................................................................................................................................91
Note 26.27: Flow rate too low ..............................................................................................................................92
Error 26.28: Return temperature too low..............................................................................................................92
Note 26.29: Flue gas temperature too high...........................................................................................................92
Note 26.30: Small service required .......................................................................................................................92
Note 26.31: Large service required .......................................................................................................................93
Note 26.32: System overload ...............................................................................................................................93
Note 26.33: Fuel too large or too wet ...................................................................................................................93
Note 26.34: Fuel too small or too dry ...................................................................................................................94
Error 26.35: Accumulator sensor F4 ......................................................................................................................94
Error 26.36: Accumulator sensor WE2...................................................................................................................94
Error 26.37: BSB F5(1-4) .......................................................................................................................................95
Note 26.38: Boiler manual OFF.............................................................................................................................95
Error 26.40: Hot water sensor at WE1...................................................................................................................95
Error 26.40: Hot water sensor at WE2...................................................................................................................96
Error 26.42: Heating circuit 1 sensor F8.................................................................................................................96
Error 26.43: Heating circuit 2 sensor WE2 .............................................................................................................96
Error 26.44: Heating element sensor at WE1.........................................................................................................97
Error 26.44: Heating element sensor at WE2.........................................................................................................97
Error 26.45: Solar panel sensor WE1.....................................................................................................................98

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Error 26.46: Pellet/Oil/Gas boiler Sensor at WE1 ..................................................................................................98
Error 26.46: Pellet/Oil/Gas boiler sensor at WE2...................................................................................................99
Note 26.47: Pellet/Oil/Gas boiler –Residual heat use ...........................................................................................99
Error 26.48: WRS2000 sensor ...............................................................................................................................99
Error 26.49: Heating circuit 1 WRS-D ..................................................................................................................100
Error 26.50: WRS-D HC1 sensor ..........................................................................................................................100
Error 26.51: Heating circuit 2 WRS-D ..................................................................................................................100
Error 26.52: WRS-D HC2 sensor ..........................................................................................................................100
Error 26.53: Outside sensor from BUS.................................................................................................................101
Error 26.54: Accumulator sensor F4 from BUS.....................................................................................................101
Error 26.55: BSB F5(1 –4) from BUS....................................................................................................................101
Error 26.56: Accumulator sensor WE2 from BUS .................................................................................................102
Error 26.57: BSB F5(1 –4) from BUS at Accumulator 2.........................................................................................102
Error 26.58: Hot water sensor from BUS .............................................................................................................102
Error 26.59: Hot water sensor 2 from BUS...........................................................................................................103
Error 26.60: E-load circuit Hot water sensor at WE1 ............................................................................................103
Error 26.60: E-load circuit Hot water sensor at WE2 ............................................................................................103
Error 26.61: E-load circuit Hot water sensor from BUS.........................................................................................104
Error 26.62: E-load circuit Accumulator sensor F4 ...............................................................................................104
Error 26.63: E-load circuit Accumulator sensor from vom BUS.............................................................................104
16 TÜV: Tests and engineering standards .........................................................................105
17 TÜV: Notes about safety functions ..............................................................................106
17.1 Flush chimney after power failure ...........................................................................................................106
17.2 Open door(s) in operating status “Boiler ON” ..........................................................................................106
17.3 Open door(s) in operating status “Boiler OFF” .........................................................................................106
17.4 Pellet/Oil/Gas enabling...........................................................................................................................106
17.5 E-Load circuit enabling ............................................................................................................................106
18 Tips and recommendations..........................................................................................107
18.1 System overload (Note 26.32) .................................................................................................................107
18.2 Calculating the loading capacity of the accumulator.................................................................................107
19 Subject Index...............................................................................................................108

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1 Introduction
Dear customer, Dear heating technician,
The controller LambdaControl 2 BSB® is the result of many years of research and resultant knowledge of Logotherm. It
contains the latest innovations in combustion and system technology and offers the highest level of quality and
perfection.
Numerous of LambdaControl 2 BSB®´s automatic functions are unique new developments by our company. This system
fundamentally operates by automatically “learning” and “gathering” pertinent characteristics of your heating system
and its operating methods. This information is then used to calculate the optimal settings resulting in the highest level
of comfort and efficiency, an extraordinary eco-friendliness and last but not least in a significant reduction of energy
costs.
Alongside with other functions, the fuel consumption calculation (BSB) when firing or refuelling the system and the
combustion and burnout optimisation (AAO) are the most significant new developments.
1.0 Abbreviations and technical terms
AAO Combustion and Burnout Optimisation
ABO Combustion Demand Optimisation
Acc. t.-F4 Temperature at accumulator sensor F4 in accumulator 1
Acc. t.-WE2 Temperature at accumulator sensor in accumulator 2
AF. Anti-freeze
AFO Fire Optimisation
BSB Fuel Calculation
EElectric (i.e. in electric load circuit)
ECO Reduced operations
F Sensor
Heat system Installed heating system
K Kelvin (a difference of 10K corresponds to a change of 10°C)
KLA Reduced Boiler Output
KV-KR Boiler flow –Boiler return
kW Kilowatt (power)
kWh Kilowatt/hr. (energy)
Legionella Pathogen, proliferate especially in temperatures from 25°C to 50°C
O2Sensor Oxygen sensor
PAE Accumulator Run-up Easing
PH Heating demand
PK Boiler output
RSA Rapid System Heating
RWO Residual Heat Optimisation
SK1(2) Solar panel 1 /Solar panel 2 activated
SLA Peak Load Coverage
STB Safety Temperature Limiter
TA Outside temperature
TAD Flue gas Temperature Difference = Flue gas temp. - Boiler temp.
TR Return temperature
TV Flow temperature
TWR Living room temperature
V1 Primary Combustion air
V2 Secondary Combustion air
WRS Remote control panel
HW Hot water (ex. in hot water tank, hot water charge pump)
Y1 Return valve

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Y2 Load valve
≤smaller than or the same as
≥greater than or the same as
< smaller than
> greater than
λLambda (air ratio)
1.1 Display and operating element
Display 1: Shows the operation mode of the wood boiler –when lit “Boiler ON”.
Display 2: Refuel signal. Displays when additional fuel can be added. Only in operation mode “Boiler OFF”.
Display 3: Error indicator “red” –illuminates when an error occurs, which prevents heating.
Follow the displayed instructions.
Display 4: Error and note indicator “amber” –illuminates in case of an error or if a note is displayed. Leaves boiler
operation possible. Follow the displayed instructions.
Display 5: Illuminated text display. If the boiler is switched off and there is no error or note, the screen will automatically
go dark after 15 minutes (power saving function). Press any button to deactivate the power saving function.
After deactivating this function all buttons will function normally.
Button 6 ▲: This button has multiple functions: navigating through the menus, changing set values, deactivating the KLA
function.
Button 7 ▼: This button has multiple functions: navigating through the menus, changing set values, activating the KLA
function (KLA function is not available for all boiler types).
In “Boiler OFF”, Button 7 (▼) is also used to call up or end the service program (“Service small/large”).
Please take notice of the note “Service” displayed.
If the firing process is started after a successful service, it is possible to change directly into the firing program
by pressing Button 9 (►) without ending the service function first. However, the service interval will not be
reset in that case.
Safety Shutdown: Pressing Button 7 (▼) twice, in “Boiler ON” mode, shuts off the boiler.
Please note: This shutdown is for emergency situations only, not a general operating function!
Please note text instructions.
Button 8 ◄: To enter the menu “Selection” and select a menu item or value. The buttons 6 (▲) and 7 (▼) are used to query
information and/or settings can be changed (button 6: up in the menu, button 7: down in the menu). To
confirm changed settings, press button 8 (◄).
Button 9 ►: To fire (in “Boiler OFF“) or to refuel (in “Boiler ON“). Button 9 (►) is also used to leave a menu or to switch
to the next higher menu.
Fire: Press the button once to leave the power saving mode. Press it twice to activate the flue gas fan and enter
the safety program for “Open door(s)”. After that, the refuel program starts.
10
6
10
7
3
4
2
1
8
5
9

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Please follow the displayed instructions.
If the refuel program was activated by mistake, press button 9 (►)to deactivate it.
Once the required flue gas temperature is reached an audible alert sounds to indicate that the door(s)
need to be closed. Then “Display 1” illuminates –“Boiler ON”.
Please follow the displayed instructions.
Refuel: Is the “Boiler ON” and button 9 (►) is pressed the safety program for “Open door(s)” is entered and the
refuel program starts. The fuel must be added quickly. Then the fuel door must be closed immediately.
Please follow the displayed instructions.
“Refuel” is displayed for about 5 minutes –regardless of the actual time required to refuel.
Button 10: Reset button of the electronic safety temperature limiter (STB). If the STB was set off due to a too high
boiler temperature and that temperature then dropped to 86°C or lower, button 10 can be used to reset
STB manually.
Please follow the instructions displayed.
After pressing button 10, the error display will be deleted automatically.
1.2 Function display
AAO Combustion and Burnout Optimisation ABO Combustion Demand Optimisation
AFO Fire Optimisation E-L Electric load circuit activated
Frost Anti-freeze activated KLA Reduced Boiler Output
Öl - Gas Pellet/Oil/Gas operation enabled PAE Accumulator Run-up Easing
RSA Rapid System Heating RWO Residual Heat Optimisation
SK1(2) Solar panel 1 (2) activated SLA Peak Load Coverage
Heating element activated
1.3 AFO: Fire Optimisation
Note: This basic function cannot be activated or deactivated manually. But, it is activated automatically
with each combustion.
When AFO is activated, AFO will be displayed.
Opening the door(s) (refuelling) in the operation mode “Boiler ON” is not advisable.
Recommendation: Do not refuel unless the “Refuel” sign is lit up.
Effect: AFO consists of several parameters programmed by the manufacturer, depending on the boiler
type and the fuel properties.
Function: After firing, the boiler will automatically enter the “AFO mode”. AFO-Output and duration depend
on the required primary and secondary combustion temperature and ash amount to keep minimal
emission to burn on a reduced output.
Use: Each combustion is carried out under practically the same –ideal conditions.
1.4 KLA: Reduced Boiler Output
Note: This basic function is not available for every boiler type.
KLA (▼) can be activated as required.
KLA is only useful, if more than one combustion are carried out per day –which is not possible in
some cases.
KLA is automatically deactivated at the beginning of each new combustion. By pressing the (▲)
button KLA can be deactivated during the combustion. When KLA is activated, KLA is displayed.
Function: If the (▼) button is pressed while in “Boiler ON” mode, the system will be regulated to the
smallest boiler output possible once completing the AFO mode –regardless of the heat demand.
This might result in a reduced flue gas temperature (see chapter 1.15).
Use: Depending on the boiler type and the fuel, the burning cycle can be extended, which can simplify
burning the remaining coal and/or remaining amber.

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1.5 AAO: Combustion and Burnout Optimisation
Alongside with BSB, AAO is the most important function. It regulates fuel properties, which are not always ideal in
practice.
Note: This basic function cannot be activated or deactivated manually.
When AAO is activated AAO displays.
Effect: If the combustion temperature is too low, the controller automatically increases the boiler output
to meet the minimum combustion temperature required. A too low combustion temperature
reduces the efficiency of the firing and can lead to increased emissions.
Possible reasons for an activation of AAO:
●Fuel is too large or too wet.
●If the fuel amount is running low in part load operation (burnout), AAO increases the boiler
output in order to reduce emissions.
●If the fuel chamber is “large” and the fuel is “wet”, AAO is also activated during the
combustion. The high vapour content in the flue gas, resulting from wet fuel (when the
amount of fuel is high), reduces the temperature of the embers. Therefore, AAO
automatically increases the boiler output. This can temporarily require combustion with ≥
35 kW from a boiler type with a rated power of 30kW.
Function: The controller recognizes this problem when the secondary air flap is in the position of the
minimal airflow and the current O2value is 1% higher than the set O2value. In that case the set
boiler output is ignored and the output is increased. Thanks to this automatic function not ideal
fuel properties are compensated in order to prevent combustion errors.
Use: Achieving the highest degree of efficiency with low emissions.
1.6 RSA: Rapid System Heating
Note: Setup is as follows:
“Accumulator” → “Settings” →9.05 RSA ON <.
Setting note: Low temperature heating 30°C to 40°C / Radiator heating or heating system with a hot water tank
45°C to 50°C.
Factory setting: 50°C / Setting range: 0°C to 60°C.
Setting 20°C: Can be advantageous, if the boiler output is significantly larger than the heating demand –then
RSA is not required.
If RSA is activated, RSA displays.
Use: The accumulator temperature quickly climbs to a “usable temperature” with enough of hot water
available for use. Thereby, sensible heat and usable hot water are produced quickly.
Effect: This function temporarily reduces the return temperature. Thus, the water quantity, released
from boiler and accumulator, increases. RSA can be executed multiple times per combustion. This
happens, if the temperature at the accumulator sensor drops under the in 9.05 RSA ON < set
value.
Function: If “Acc. t.-F4” is < than the in 9.05 RSA ON < set value, RSA function is activated.
1.7 SLA: Peak Load Coverage
Note: Setup is as follows:
“Accumulator” → “Settings” → 9.04 SLA ON <.
Setting note: Low temperature heating 40°C to 50°C / Radiator heating or heating system with a hot water tank
50°C to 60°C.
Factory setting: 60°C / Setting range: 20°C to 60°C.
If SLA is activated, SLA displays.
Use: If a higher output than the boiler rated output is required.
Effect: The boiler output is increased to its maximum output. The maximum output varies
depending on the boiler type, the type of fuel and its moisture content.
Function: After successfully completing AFO, SLA is automatically activated, if the “Acc. t.-F4”value is <

9
than the in 9.04 SLA ON < set value.
If the “Acc. t.-F4”exceeds the set value, SLA is deactivated and disabled for the next 30 minutes.
The SLA runtime is 60 minutes.
1.8 PAE: Accumulator Run-up Easing
Note: If PAE is activated, PAE displays. The current heat load release is displayed in:
“Accumulator” → “Information” → HC-release
PAE contains three functions with different effects:
Function 1: Heating demand limiter of the heating circuits regulated by the LambdaControl 2 BSB®
Function 2: Hot water preparation when “Acc. t.-F4”> 60°C
Function 3: When the hot water preparation is ON, but the increase in temperature is not enough for the hot
water tank.
Function 1:
Note: Setup is as follows:
“Accumulator” -> “Settings” -> 9.06 PAE ON <
This setting allows an adaptation of the heating circuit temperature level and the minimum
required hot water temperature 12.04 HW min.
Settings note: Low temperature heating 40°C to 50°C / Radiator heating or heating system with a hot water tank
50°C to 60°C.
Factory setting (Fact.): 50°C / Setting range: 20°C to 60°C.
Use: If the heating demand is high and the “Acc. t.-F4” is lower than required by the heating circuits,
PAE prevents the accumulator from heating up to capacity due to fully opened heating circuit
valves. If the entire accumulator is heated up, the heating time of the system is extended. Is the
heating circuit temperature too low, the boiler output cannot be given off to the radiators, but is
returned to the accumulator. Due to the downstream accumulator the “Acc. t.-F4” and the
heating circuit temperature increase slowly. This might give the impression that the boiler output
is too low. Since PAE throttles the heating circuit, it prevents that from happening.
In the factory setting PAE < 50°C, the hot water is quickly heated up to a usable temperature due
to the limitation of the heating demand.
Effect: Only available in “Boiler ON” mode and if the return valve is > 0% and the
“Acc. t.-F4”is < 9.06 PAE ON <.
Function: Factory setting: 50°C. An“Acc. t.-F4”≥ 50ºC does not influence the heating output of the heating
circuits –the HC-release is = 100%.
At an “Acc. t.-F4”≤ 30°C, the heating output = 0% (heating circuit valve closed) –HC-release = 0%.
PAE spreads over a bandwidth of 20K and works with a deceleration value –in line with “Acc. t.-F4”.
Example: PAE setting 50°C –current “Acc. t.-F4”= 40°C.
If “Acc. t.-F4” = 40°C, the HC-release is 50%. If the heating circuit only requires 40% of the heating
output due to the outside temperature, PAE has no effect because the limitation of the heating
demand only starts at 50%.
Function 2:
Note: Function 2 cannot be activated or deactivated manually.
Use: Function 2 prevents the safety thermostats (including those in floor and wall heating) from
activating.
Effect: If the “Acc. t.-F4”is > 60°C and the hot water charge pump is switched off, the heating circuit
flow temperature will increase significantly (pressure difference in heating circuit manifold).
Function: 30 seconds before the HW load pump is switched off, PAE will set to 50%. At that time, the HC-
release is 50% –the heating demand is limited to 50% for one minute –the heating circuit valves
close accordingly.

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Function 3:
Note: Function 3 can be deactivated as follows:
“Hot water” →“Settings” → 12.08 HW priority.
If the setting is YES, function 3 is activated.
Use: Function 3 ensures that the hot water preparation is possible and not carried out with a too low
transmission capacity.
Effect: Multiple heating circuit pumps operating in the same heating circuit manifold with opened
heating circuit valves could be the trigger. In that case, the weaker HW load pump may not be able
to pump water.
Function: If the boiler is fired and a hot-water preparation is pending, PAE is set and held at 20% with the
“Close door(s)” signal. If the hot-water preparation is finished or the accumulator temperature
exceeds the set boiler temperature -20K, PAE is set to 100%.
If 12.08 HW priority is set to “NO”, Function 3 is not executed.
The setting NO is only recommended, if the boiler output is a lot higher than the heating demand
or the accumulator capacity is too low compared to the boiler.
1.9 Residual Heat Use
Note: This is a basic function that is activated in case of a defect of “Acc. sensor F4” or if RWO was
deactivated.
This basic function cannot be activated or deactivated manually.
Not serviceable if the boiler temperature is lower than 88°C.
Use: Best possible usage of the residual heat.
Effect: Prevents an activation of STB - Usage of the heat emitted from the heating components.
Function: A high percentage of the residual heat is used immediately upon entering the “Boiler OFF” mode.
The return temperature control regulates the required return set value for another 10 minutes. If
the boiler temperature rises above the set value, the return valve will be completely opened
(100%) at first. Then the load pump is switched on. Thus, the hot boiler water is replaced by colder
water from the accumulator.
Please note that the residual heat will be used more efficiently if the accumulator is not filled to capacity.
1.10 RWO: Residual Heat Optimisation
Note: RWO can be deactivated manually.
To activate/deactivate:
“Wood boiler” → “Settings” → “Initial settings” → 5.21 RWO.
Depending on the system, the setting “OFF” can be advantageous; i.e. if the flow/return pipes
(boiler ↔ accumulator) are very long or if a layer charge of high temperature is required. It is
then the same function as described in chapter 1.9.
If RWO is activated, RWOdisplays.
Use: RWO results in the most efficient utilization of the fuel possible.
Effect: RWO considers the combustion intervals and the difference in temperature between boiler and
accumulator. If the combustion intervals are long, the heat from the boiler is removed fast
(cooling loss is minimized). If the intervals are short, the residual heat will remain in the boiler to
ensure:
a)a quick supply of power
b)a reduction of the boiler heat loss.
Function: The difference between boiler and accumulator, produced by residual heat, is changed
automatically based on the calculated combustion interval so that the boiler has an accordingly
higher or lower temperature for the next firing.
Please note that the residual heat will be used more efficiently if the accumulator is not filled to capacity.

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1.11 BSB: Basic Principles
BSB requires the accumulator sensors F5 (1-4). These sensors are used to calculate the correct refuel amount. The
displayed fuel amount is dependent on the boiler operating status (“Boiler ON/OFF”).
Operating status “Boiler OFF”:
In “Boiler OFF” the refuel amount is only displayed, if the for AFO required fuel amount can be added. The time of the display
of the fuel amount depends on the “AFO runtime” - in this time the energy amount of the firing must be able to be dispensed
to the accumulator.
Operating status “Boiler ON”:
The refuel amount displays only after a completed AFO and no earlier than “one hour” before the calculated ending of
burning cycle (minimal smoke nuisance while refuelling), whenever the refuel capacity allows refuelling.
Opening the door(s) (refuelling) in “Boiler ON” is not recommended.
Recommendation: Do not refuel unless the “Refuel” light illuminates.
The controller considers basic data for calculating the refuel amount, such as fuel and boiler properties, as well as the
actual free capacity of the accumulator.
By each combustion it also learns the following:
●the varying energy content of refuel amounts, dependending on the age of the fuel and/or
hollow spaces caused by refuelling
●the energy demands of the hot water preparation
●the energy demands of the water in the heating circuit
●the heat loss via equipment - heat emissions that cannot be used for heating the room.
This method ensures highly efficient fuel calculations, high level of efficiency and a high level of
comfort.
The outside temperature sensor monitors the heating demand during combustion, which increases the refuel amount.
Therefore, the outside temperature sensor is beneficial for BSB, even if the integrated heating circuit control is not
required.
BSB calculates the fuel amount so that the accumulator is loaded to capacity at the end of the combustion. It is not
filled to capacity, only if:
a)the fuel amount required is larger than the amount fitting in the boiler (>100%)
b)the boiler output is not sufficient to load the accumulator to capacity during combustion.
Example 1: Boiler output 30 kW / heating demand 25 kW / burning cycle 5h. (30-25) x 5 = 25
25 kWh are available to load the accumulator.
Example 2: Boiler output 30 kW / heating demand 5 kW / burning cycle 5h. (30-5) x 5 = 125
125 kWh are available to load the accumulator.
To fill the accumulator to capacity with 3000L, approx. 150 kWh are required.
1.12 BSB: Fuel Calculation without heating demand
Note: The combustion is carried out with rated power or SLA.
Without the outside temperature sensor or if the setting 5.04 BSB with heating d. –is “NO”, the
fuel amount is only calculated for the free accumulator capacity.
BSB Setup is as follows:
“Wood boiler” → “Settings” → BSB settings.
BSB without heating demand is meant for large accumulators / energy storages, if the heating
demand is not considered due to a high boiler output.
1.13 BSB: Fuel calculation with heating demand
Note: The combustion is carried out with rated power or SLA.
Function 5.04 BSB with heating d. can be deactivated.
In “Anti-freeze”, “Holiday” and “reduced”, the fuel amount is calculated without the heating
demand.
Setup is as follows:
“Wood boiler” → “Settings” → “BSB settings” → 5.04 BSB with heating d.

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If “NO” is selected, BSB functions as described in chap. 1.12.
Use: With existing heating demand the refuel amount is increased (high comfort).
BSB with heating demand is the ideal standard application.
Effect: With the outside temperature sensor, BSB considers the fuel amount for the accumulator loading
as well as the amount of fuel (amount of energy), which can be dispensed to the heating system
(heating demand) during the burning cycle.
1.14 BSB: ABO –Burning Demand Optimisation
Effect: ABO is not available for all boiler types.
ABO requires BSB with heating demand.
The combustion is carried out with rated power or SLA or modulating.
Setup is as follows:
“Wood boiler” → “Settings” → “BSB settings” → 5.05 ABO.
If “NO” is selected, BSB functions as described in chap. 1.12.
If the fuel amount was calculated for a combustion with ABO, ABO displays after the text display
“Close door(s)”.
Use: At a high heating demand, a larger amount of fuel may be added.
At a lower heating demand ABO is not used - this would only increase the boiler operating hours,
but not the comfort.
Effect: BSB considers the heating demand for the following combustion period at the smallest boiler
output, which increases the amount of energy dispensed to the heating system –resulting in an
increased refuel amount. ABO runs automatically, if the heating demand is bigger than half of the
smallest boiler output. The smallest boiler output depends on the boiler type, fuel properties and
settings in 5.13 Flue gas min.
Function: After AFO is completed, the boiler output is constantly adapted to:
● the fuel amount left in the boiler
● the current heat demand
● the current free loading capacity.
Therefore, it is NOT necessarily regulated to the smallest boiler output. The boiler output is
controlled in a way that after the combustion an accumulator loaded to capacity is available for
use. This is why the boiler output is always higher than the required heating demand.
The accumulator is not loaded to capacity, if the factors listed in chapter 1.11 BSB: Basic Principles
apply.
ABO YES should only be selected, if:
1. the boiler and chimney are suitable ( low flue gas temperature);
2. a Logotherm conform hydraulic system with proper sensor adjustment is used.
1.15 Minimum Flue gas Temperature
Note: The controller strategy is to burn at rated power, except for the functions KLA and ABO.
KLA and ABO are subject to release by the boiler manufacturer.
If one of these functions is being executed, a reduced flue gas temperature may be the result —
depending on the boiler type. To avoid that, the minimum flue gas temperature can be increased.
Setup is as follows:
“Wood boiler” → “Settings” → “Initial settings” → 5.13 Flue gas min., BSB takes the set value into
consideration.
Use: The minimum flue gas temperature (smallest boiler output) can be adjusted to the chimney
requirements.
Effect: The value may be adjusted across the entire setting range of flue gas temperature of the boiler
type, as specified by the boiler manufacturer; i.e.: If the boiler type has an output range of 28 kW to
53 kW –classified in 3 output range levels (Type 30 / 40 / 50), the flue gas temperature of Type 30
may be adjusted by increasing 5.13 Flue gas min. to a maximum of 53 kW. If the flue gas

13
temperature is set ≥ the required flue gas temperature for the rated output of the boiler type, KLA
loses its effect; is it set higher than the boiler rated output x 1.25, SLA is switched off as well.
If 5.13 Flue gas min. is increased substantially, the accumulator volume must be checked. If it is too small, the refuel
amount is reduced, since the heating demand would become insignificant compared to the higher boiler output.
1.16 Refuel signal without BSB
Note: The function may be adjusted. Setup is as follows:
“Accumulator” → “Settings” → 9.03 Refuel signal.
Settings note: Low temperature heating 30°C to 40°C / Radiator heating or heating system with hot water tank
45°C to 50°C.
Factory setting: 40°C / Settings range: 20°C to 80°C.
Use: High comfort through information in the living area, less combustions, larger refuel amounts
through higher free accumulator capacity. Overall: more comfort and higher annual degree of
efficiency (reduced heat emission losses).
Function: The refuel signal displays, if “Acc. t.-F4” ≤ 9.03 Refuel signal.
The higher the adjusted value, the lower is the free accumulator loading capacity while
refuelling → less fuel can be added → shorter burning cycle → shorter burning intervals.
1.17 Refuel signal with BSB - Heating date Calculation
Function like in chapter 1.16, displayed additionally;
●the estimated date at which the “Acc. t.-F4” falls under 9.03 Refuel signal;
●Screen 4 shows the accumulator load as analogue bar diagram. The bar is full if the
accumulator load is ≥ 75%. The bar diagram is empty, if the accumulator load is ≤ 0 kWh (0
kWh refuel signal).
Use of heating date: High comfort, since checking the remaining accumulator load in between burning cycles is not
required.
Function: The controller constantly learns the dynamic energy consumption of the system. This requires at
least one burning cycle –the energy consumption calculation starts at 00:00 and ends at 24:00
(24h cycle).
After commissioning: The controller also constantly learns, the free loading capacity when display
4 (refuel) illuminates, and defines it with 0 kWh. Therefore, the first five burning cycles should
start only after the refuel signal illuminated. If the system fires before, the learnt value does not
change. After the five burning cycles, there is only a small deviation of the actual heating date
(free loading capacity depends on the heating demand and the characteristics of the warm water
preparation), if a new burning cycle is started before the refuel signal illuminates.
The heating date calculation can deviate:
●in case of a change of the set value in 9.03 Refuel signal
●if fuel is always added before the refuel signal illuminates
●in case of heavy fluctuations in energy use (e.g. reduced operation)
●in case of alternating heating operation (cooling of living rooms)
●if other heat generators are active (solar, pellet/oil/gas…).
Due to those factors the estimated heating date is limited to 4 days for safety reasons; i.e.
to prevent frost damage.
The heating date should be seen as a guidance value and increases the level of comfort.

14
1.18 Integrated fuel types
Different types of wood, i.e. birch, spruce, beech etc., have different densities, resulting in different heating values. The
following values can be used as a guideline:
D = Density in %; Hu = Heating value kWh/kg; w = Water content in %
Type of Wood
D
%
Hu kWh/kg
Type of Wood
D
%
Hu kWh/kg
w: 15%
w: 0%
w: 15%
w: 0%
Copper beech
100
4.01
4.86
Aspen
69
4.13
5.01
Spruce
70
4.25
5.15
Pine
85
4.37
5.30
White beech
102
3.59
4.72
Poplar
61
3.79
4.81
Hornbeam
102
3.89
4.72
Trembling poplar
69
4.13
5.01
Birch
98
4.33
5.25
Linden
79
4.13
5.01
Ash
102
4.09
4.96
European aspen
69
4.13
5.01
Oak
102
4.21
5.10
Douglas fir
77
4.33
5.25
Turkey oak
113
4.21
5.10
Willow
78
4.09
4.96
Black pine
91
3.37
5.30
Swiss stone pine
67
4.33
5.25
Locust
110
4.09
4.96
Hazel
85
4.13
5.01
Larch
90
4.29
5.20
Bush wood chips
50
4.25*
5.15
Elm
97
4.13
5.01
Sawmill scraps - beech
70
4.01*
4.86
Maple
91
4.13
5.01
Sawmill scraps - spruce
50
4.25*
5.15
Acacia
91
4.13
5.01
Briquet - beech
250
4.01*
4.86
Fir
74
4.49
5.44
Briquet - spruce
190
4.25*
5.15
Alder
76
4.13
5.01
Comments and supplements:
Density (D): The density of the copper beech (1005) is used as basis to calculate the different values. Compared to
this value, spruce is 70%, beech 98% and white birch 102%.
E.g.: If the burning time of red beech is 6h, it will take spruce 4.2h to burn.
Heating value (Hu): Is highly dependent on the water content (w); i.e.is the water content 30%, Hu of copper beech
is 3.17kWh/kg and Hu of spruce is 3.36kWh/kg.
Fuel CO2max: An average maximum CO2content of 20.3% is assumed.
*Bulk material: Bulk material is often fuel that is notably shorter than determined by the manufacturer; i.e. on
average shorter than 30cm in the case of a 0.5m log boiler. The classifications “Sawdust scraps-beech” and “Sawdust
scraps-spruce” represent all hard and soft woods.
Refuel amount: Since the density of wood types varies, it is advisable to start with small amounts of fuel to gain
experience.
With BSB the correct amount of fuel is calculated automatically, if 5.01 Type of wood is set correctly.
Mixed wood: Generally only fuel with the same density should be used together for one combustion. If different
types of wood with different densities are mixed, i.e. wood with a density of 100% and wood with D=70%,
combustion errors can occur. Because fuel with a density of 70% burns faster than the one with 100%. This can lead
to hollowing. If mixing densities cannot be avoided, the softer wood should be at the bottom and the hard wood
should be placed above.
When using BSB the average value of the density and the heating value of the different types of fuel used needs to
be calculated in order to be able to choose the suitable type of fuel that must be set for the BSB function.
Example: Copper beech and spruce combined average the density and heating value of hazel (D=85%,
Hu=4.25kWh/kg).

15
1.19 Water content –moisture content of fuel
Generally a wood boiler can burn wood in its natural form, if its water content (w) is lower than 20%. A high moisture
content in fuel can lead to complications while burning and reduces the efficiency of heating and the dispensed amount
of energy. Therefore, please read the manufacturer’s specification. They provide information about what combustibles
with what water content are permitted. Depending on the storage location and time, fuel can contain various amounts
of moisture:
Storage Time
Water content w (%)
Humidity (Atro) u (%)
(stored covered outdoors)
Water content w (%)
Humidity (Atro) u (%)
(stored indoors)
“Moisture” settings in
controller
Months
w (%)
u (%)
w (%)
u (%)
u > 28%: “high”
u = 17 –28%: “medium”
u < 17%: “low”
3
44
78
36
56
9
26
35
23
30
18
17
20
15
17
24
16
19
14
16
30
15
17
13
15
The following basic rules should also be observed:
Firewood must be stored for at least 18 months indoors or 24 months covered outside.
For the boiler:
●Short logs should be arranged in an offset pattern to use the full capacity of the fuel
chamber.
● Make sure that there are small gaps in the fuel stack for air. Squared timber and waste
wood need to be chopped to avoid compact compounds.
●The wood must be stacked in a way that the fuel can slide and does not create a large free
space.
1.20 Refuel amount
Please note the density and energy content amounts described in chapter 1.18. Also, make sure that the heating system
is not hot when beginning the setback operation. Refuelling before the setback operation is only permitted, if it does
not result in overtemperature.
BSB automatically calculates the appropriate amount of fuel and energy.
1.21 Energy content and usable energy content of the fuel
The energy contents, also called heating value (Hu), do not always correspond with the specifications; i.e. wood pellets or
wood briquets with 5.8 kWh/kg would only be possible, if NOT ONLY natural wood was used to produce them. The energy
content of spruce is, depending on the location, between 5.0 to 5.2 kWh/kg with a water content of w=0% (dry substance).
The averaged energy content is 5.15 kWh/kg at w=0%. However, in practice a water content of less than 10% is hardly
found.
If w=10%, 1000 kg wood (of any type or form) consist of 900kg dry substance and 100 litres of water. Per litre of water,
a loss of 0.68kWh must be deducted (vapour energy).
Usable energy content of spruce/kg with a water content of 15%:
If w=15%, it is 4.25 kWh/kg. Applying a boiler efficiency grade of 91%, 4.25 x 0.91 = 3.86 kWh/kg is available as usable
energy.
Usable energy content of spruce/m3 (cubic meter) with a water content of 15%:
At w=15% it is 1520 kWh/m3. Applying a boiler efficiency grade of 91%, the usable amount of energy is 1520 x 0.91 =
1383.2 kWh are available.
The usable energy is generally reduced by the system efficiency grade (also called annual efficiency grade), mainly through
energy needed to heat the actual boiler and the water therein to 85°C –which cannot be used after firing entirely for
heating purposes. This is especially the case with low heating demands and when the accumulator is loaded to capacity
after burning.

16
Therefore the setting in “Accumulator” → “Settings” → 9.02 Acc. reserve should only be set to 0%,
if the sensor positioning is Logotherm conform –and only if no backup for heating or solar is
needed.
In numbers: Boilers with a rated output of 20 kW to 30 kW usually have a fuel chamber that can hold an energy amount of
approx. 130 kW (spruce). Approx. 25kWh are needed to heat the boiler from 20°C to 85°C. In practice, only 70% of this
amount of energy can be used, resulting in a loss per boiler filling of 7.5 kWh. Based on the 3.86 kWh/kg and the
assumption of an energy loss when heating the boiler, the average usable amount of energy per heating period is 3.64
kWh/kg.
An accumulator not loaded to maximum capacity ensures a much better use of the residual heat –therefore a higher
amount of usable energy. The faster the residual boiler heat is dispensed to the loaded accumulator that is not filled to
capacity, the smaller are the boiler heat emission losses, as well as cooling losses through the chimney (see chap. 1.9).
1.22 Protective functions for the boiler/ pumps –valve stuck protection
Protective functions - boiler: If the boiler is not heated for 7 days, the actuators are operated, the O2sensor is
regenerated and the boiler is aired for 2 minutes to keep it dry.
Pumps- valve stuck protection: They are also operated in the 7-day rhythm; i.e. every Sunday the stuck protection
begins at 3.00 o'clock. In addition, the wood boiler MUST BE SWITCHED OFF at least for 1 hour and the boiler
temperature must be lower than 60°C. The pellet/oil/gas boiler (if available) MUST BE SWITCHED OFF and lower than
60°C.

17
2 Commissioning
2.1 Safety instructions for initial system operation
Follow these operating instructions closely as well as the operating instructions to your wood boiler.
The aggregates and settings depend on your heating system.
After commissioning only the displays and settings relevant to you will be displayed.
Commissioning is subject to the following conditions:
An accumulator is connected to the boiler, which minimum volume is in accordance to CEN
Standards or reaches at least the minimum volume according to the boiler manufacturer.
All applicable norms and standards are met.
The system was commissioned by a certified furnace technician.
The boiler name (type) is stored in the LambdaControl 2 BSB®.
2.2 Minimum requirements for a trial run or heating test
The following conditions must be met to conduct a test run:
The flue gas pipe must be connected dust- and gas-proof to the chimney, the flue gas system must
be unobstructed –ventilation of the furnace room must be ensured.
The safety valve must be installed at the boiler infeed (closed system).
The discharge safety device must be installed and functional (closed system).
The system must be filled to the required heating system pressure.
The expansion tank must be connected and NOT be blocked.
The openings for cleaning at the boiler must be closed tightly.
The flue gas temperature sensor must be in place.
The combined STB- and boiler temperature sensor must be located in the designated sleeve and
secured against accidental removal.
The return temperature sensor must be assembled properly and secured against loss of the
thermal contact.
The oxygen sensor must be screwed tightly in the proper position.
Before the controller is connected to the power circuit all electrical connections must be
connected properly, including the sensors.
The controller must be connected to the power supply.
After the commissioning, described in chapter 2, no “red” error should occur. Because in that case
the boiler CANNOT be fired.
Prior to heating, the following applies:
All safety conditions must be met.
The electrician confirmed electrical soundness and function of the system.
The furnace technician confirmed soundness and function of the system.
The user must have been informed about operation and function of the heating system.
Once a new controller is connected to the power supply, “Password” appears in the display. After entering the codes for
the Technician (see chapter 2.3) commissioning (see chapter 2.4) is enabled (check “Commissioning” in the text
display).
“Commissioning” is only displayed, if no heating system has been entered into the controller, or no commissioning has
been conducted.
“Commissioning” must be acknowledged with the button ◄—after necessary adjustments were made —this will save
the settings entered.
Then select the submenu displayed in menu “Selection” (refer to table in chapter 4.1.1) — they are independent of the
heating system adjustment. Make all required settings in the submenus. Note that submenus can include test functions
(aggregate test) which must be run before firing. Also, calibration of the O2-sensor must be carried out before firing.

18
If setting changes are required after commissioning, they can be done (see chapter 2.5) using the Technician password
in “Selection” → “System”. These might be required, if a new heating system or a different boiler are installed, for
instance.
To make sure that all important settings are made, important parameters from other menus are listed as well during
the commissioning.
2.3 Technician password
The submenu “Password” is located in the “Selection” menu; it contains:
Password
● In “Password” after pressing button ◄a random number is
displayed, which needs to be changed and confirmed by the
Technician.
● The display “Technician” indicates successful code entering.
● The display “No password” indicates that the enabling of the
required settings is locked.
Password ---
Technician/No Password
◄Enter password
▲▼ Change password
◄Confirm settings
●After entering the password, the “Commissioning” menu is displayed.
●If the system has been commissioned already, the settings requiring a password are enabled
in the menus.
●Settings requiring a password are marked in this colour.
●Settings that do not require a password are marked in this colour.
2.4 Commissioning settings
Button functions:
▲▼ Change value / ◄Confirm value, then the next setting is displayed.
The settings are displayed without parameter number, they are shown after commissioning –when the parameter is
checked again.
In case of wrong settings being confirmed, they may be corrected after commissioning (see chapter 2.5).
Language English [EN]
Language to be selected, DE, EN, IT,…
Heating system No. ---
Be mindful of the right setting.
B-Type ---
Boiler type (check the type label).
Boiler new YES
This position only appears, if the value of fire hours total (“Boiler t.”, see “Operations counter” in chapter 4.1.2) is 0 hrs.
Possible settings: “YES” / “NO”.
YES: If the flue gas temperature requires correction due to the “missing natural emission” during the
initial 50 hours.
NO: In case of a new controller and the boiler has been in use.
Flue gas min. ---°C
Setting range: Determined by the adjusted boiler range (see chapter 1.15).
The minimum flue gas temperature for the chimney may be increased.
Outside sensor YES
Possible settings: “YES” / “NO” / “BUS”.
YES: If the sensor is installed at the LambdaControl 2 BSB®.
BUS: If the temperature of the sensor is requested over the CAN-bus.
The outside sensor is required for the regulation of the heating circuit.

19
Outside sensor No. 1
Possible settings: “1” / “2”/ “3”/ “4”.
This setting is important if the sensor is required for other Logotherm control devices.
The outside sensor is required for the regulation of the heating circuit.
DCF77-Receiver NO
Possible settings: “YES”/ “NO”.
YES: If the receiver is installed, it serves for the automatic data- and time setting.
Time zone GMT+1 Setting range: -1 –+3
Note: The setting is only shown, if DCF77-Receiver YES was selected.
+1: Setting for AT, DE, IT, FR, DK, SE and other countries in this time zone.
Acc. sensor F4 YES
Possible settings: “YES” / “BUS”.
YES: If the sensor is installed at the LambdaControl 2 BSB®.
BUS: If the temperature of the sensor is requested over the CAN-bus.
Acc. sensor No. 1
Possible settings: “1”/ “2”/ “3”/ “4”.
This setting is important if the sensor is required for other Logotherm control devices.
Acc. sensor WE2 YES (Display dependent on system)
Possible settings: “YES”/ “BUS”.
YES: If the sensor is installed at the LambdaControl 2 BSB®.
BUS: If the temperature of the sensor is requested over the CAN-bus.
Acc. sensor No. 2
Possible settings: “1” / “2” / “3” / “4”.
This setting is important if the sensor is required for other Logotherm control devices.
BSB-F5(1-4) YES
Possible settings: “YES” / “NO” / “BUS”.
YES: If the sensor is installed at the LambdaControl 2 BSB®.
BUS: If the temperature of the sensor is requested over the CAN-bus.
Acc. volume 1 0.0m3Setting range: 0.0m3–99.9m3
This position requires installed BSB.
The volume must be set –no addition for water content in the heating circuits, the controller
learns constantly about the energy demand from the water contents of the heating circuits and
considers them through the BSB.
In case of a hot water zone in the accumulator, that cannot be sensed by F4, this volume above F4
(hot water zone) must not be set as accumulator volume. The controller learns constantly about
the energy demand from the water contents of the heating circuits and considers them through
the BSB.
The data of the accumulator manufacturer does not always coincide with the actual data of the
volume, or the volume may be used completely by the hydraulic connection positioning. The
controller learns constantly about the energy demand from the water contents of the heating
circuits and considers them through the BSB.
Acc. volume 2 0.0m3Setting range: 0.0m3–99.9m3
Note: Only if the heating system has an accumulator 2 and only with installed BSB.
The listed volume must be set.
Runtime Y1 150sec Setting range: 90sec –240sec
Return valve Y1 –Actuator motor runtime in seconds.
Check for proper adjustment; thus, fewer control motions are required.
Y1 Rotary valve
Type of return valve Y1.
Possible settings: “Rotary valve” / “Plunger-Plate” / “Ball valve”.
Check for proper adjustment; thus, fewer control motions are required.