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 1.12 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 -applicable hydraulic system with proper sensor adjustment is used.
1.16 Minimum Flue gas temperature
Note: The controller strategy is to burn at rated power, except for the function KLA.
KLA is subject to release by the boiler manufacturer.
If this function is being executed, a reduced flue gas temperature may 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
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.
1.17 Refuel signal
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 (Fact.): 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 during the
refuelling → less fuel can be added → shorter burning cycle → shorter burning intervals.
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