Bedienungsanleitung Steuerung S4_2006_09_25-neu.doc
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Month of issue xx/2007
Art. No. 950 281
5.12.2
Modulation heating programme via external controller (2-stage)
= display shows “HM” for modulation for minimal thermal output
= display shows flashing dot for feed screw operation
= display shows thermal output in kW
Via the “MIN/MAX” input thermal output can be modulated so that it takes on either of two
values. For this purpose an external controller (such as a room thermostat or a radiator
controller) with a potential-free output signal must be used.
If “MIN” is signalled to the “MIN/MAX” input the appliance
will reduce thermal output to the minimum level (“HM”).
If “MAX” is then signalled again to the “MIN/MAX” input the
appliance will return to the selected thermal output level
“H”.
Note: Only use potential-free controllers for external modulation.
With the +/- keys you can change the previously set output level in 0.5 kW steps at any time.
However, manual changes in thermal output only become effective when the external controller
calls for “MAX” again.
5.12.3
Modulation heating programme via internal controller (safety function)
= display shows “HM” for modulation for minimal thermal output
= display shows dot between “H” and “M” for internal modulation
= display shows flashing dot for feed screw operation
= display shows thermal output in kW
The appliance automatically monitors flue gas temperature “TR” at the fan. In Waterplus
appliances the water temperature “TW” is monitored as well. If the desired values entered into
the software are exceeded, the appliance automatically reduces thermal output to the minimum
level. When current values drop below the desired values entered into the software the
appliance returns to the selected output level. Internal controllers have priority over external
controllers because they serve safety functions.
With the +/- keys you can change the previously set output level in 0.5 kW steps at any time.
However, manual changes in thermal output only become effective when the internal controller
allows the device to return to the selected setting.
If an internal controller signals “MIN”, the appliance reduces
thermal output to the minimum level (“H.M”).
HM
2.0
Display indicates external modulation (MIN/MAX)
H.
M
2.0
Display of dot indicates internal modulation (MIN/MAX)
Modulation (MIN/MAX)
