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%.
1.10 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.
1.11 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 1.10.
If RWO is activated, RWO displays.
Use: RWO results in the most efficient utilization of 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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