5.14 Switch-off O
2
Possible settings: “O
2
”
/ “TAG”.
The wood boiler switches off after combustion, because of:
O
2
– resulting in a higher residual coal amount (simpler ignition).
TAG – resulting in a minimum residual coal amount (recommended in case of combustion problems).
5.15 Runtime Y1 150sec Setting range: 90sec – 240sec
Return valve Y1 – actuator motor runtime in seconds.
Mind the correct settings, so that fewer control processes are required.
5.16 Runtime Y2 150sec Setting range: 90sec – 240sec
Note: Only with installed Y2.
Actuator motor runtime in seconds.
Check for proper adjustment, fewer control motions are required.
5.17 AF. extended NO
Extended Anti-freeze.
Possible settings: “YES” / “NO”.
Only required, if the boiler flow run lines and return run lines are not frost-proof.
“YES” enables the following settings.
5.18 AF. outside temp. 0°C Setting range: -20°C – +5°C
“Extended Anti-freeze” is active at an outside temperature of 0°C or lower.
5.19 Runtime AF. 10min Setting range: 5min – 120min
“Extended Anti-freeze” activates for 10 minutes.
5.20 Pause time AF. 60min Setting range: 5min – 120min
“Extended Anti-freeze” deactivates for 60 minutes (pause).
Note: The controller has a standard Anti-freeze setting: If the boiler temperature drops below 7°C, the
return valve Y1 and valve Y2 open automatically and the load pump M1 is activated.
5.21 RWO Acc.-F4
Possible settings: “Acc.-F4” / “Acc.-BSB (F5)” / “OFF”, see chapter 1.11.
Acc.-F4: Includes the combustion intervals and boiler temperature ↔ Acc. sensor F4 (see chapter 5.1).
Acc.-BSB (F5): Includes the combustion intervals and boiler temperature ↔ Entire accumulator (BSB–F5).
OFF: May be advantageous, depending on the system, e.g. very long feed/return pipes between
boiler ↔ accumulator, or if one load is required with high temperature.
5.22 Y2 Enabling 90°C Setting range: 20°C – 90°C
Setting 90°C: The goal of Y2 is to stall the heating of the lower part of the accumulator. If the boiler output is too
small, there is not enough output available to heat the lower part of the accumulator. If the boiler
output is too large, e.g. in-between seasons, the upper part of the accumulator heats up quickly and
Y2 opens. Therefore, the time of the valve opening depends on the accumulator charge in the upper
part of the accumulator.
Y2 could open because of a rapidly increasing boiler temperature, even before reaching the
temperature set in 5.22 Y2 Enabling.
Setting 50°C: The valve opens according to accumulator “Acc. t.-F4” but independent of an accumulator load in
the upper part of the accumulator – in some situations this may extend the heating system
heating time.
The lower the Y2 enabling setting, the earlier the Y2-valve opens and the entire accumulator is
loaded.
Operation: After firing the boiler the heater return is piped to the upper accumulator connector. During the
burning cycle the heater return between the upper and lower accumulator connector is regulated
by a 3-point-control. After the combustion (in operating status “Boiler OFF”) the heater return is
piped to the lower accumulator connector. Thereby the system heating time in continuing high
temperature level in the upper accumulator is minimized.
Y2 control: The valve opens, if the valve adjustment is >67% and (return temperature – return set + boiler
temperature) > (boiler temperature – set value + 0.5K) is opened to 50%. Then the Y2-valve
adjusts itself to the position of the return valve with a delay. E.g.: If the return valve is open to
67%, the Y2-valve opens itself to 50%.
If the temperature on the F4 sensors increases rapidly, above the in 5.22 Y2 Enabling set value,
the Y2-valve opens to 50% and adjusts itself to the position of the return valve with a delay.
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