Selector switch
40
diff:
The output will be released, when the temperature difference between two set sensors
exceeds this value.
diff
is the basic function (differential control) of this unit for most
programs. Recommendation: In solar applications,
diff
should be set to 7 - 10K.
Somewhat lower values suffice for the feed pump program. The hysteresis has an in-
creasing effect, i.e. reaching the temperature difference plus hysteresis the output will
switch on, falling below the difference it will switch off. (ex works = 5,0K)
min:
The minimal threshold
min
generally prevents boilers from being clogged with soot.
Recommended value in this case: 60 to 70°C. The hysteresis has an increasing effect,
i.e. reaching the threshold plus hysteresis the output will switch on, falling below the
threshold it will switch off. (ex works = 0°C)
max:
The maximum function limits the storage of tanks. The hysteresis has a decreasing ef-
fect, i.e. reaching the threshold the output will switch off, falling below the threshold
minus hysteresis it will switch on again. (ex works = 90 °C)
Schematic representation of setting values:
F1e:
Switch-on time (e) of first time window (F1). The time window function allows blocking
or enabling an output additionally to the conditions of a program. A total of three time
windows stands by.
F1a:
Switch-off
time (a) of first time window (F1).