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If the speed control is activated, the TDC3 makes it possible to vary the speed of standard
pumps at relay R1 by means of special internal electronics.
7.9 Speed control
7.9.1 Variant
The following speed variants are available here:
Off: There is no speed control. The connected pump is only switched on or off with full
speed.
Variant V1: After the purging time the controller switches to the set max. speed. If
the temperature difference ∆T between the reference sensors (collector and storage
tank) is less than the set value, then the speed is decreased by one stage after the
control time elapses. If the temperature difference between the reference sensors is
greater than the set value, then the speed is increased by one stage after the control
time elapses. If the controller has adjusted the speed of the pump down to the smallest
stage and the ∆T between the reference sensors is ∆T off, the pump is switched off.
Variant V2: After the purging time the controller switches to the set min. speed. If the
temperature difference ∆T between the reference sensors (collector and storage tank)
is greater than the set value, then the speed is increased by one stage after the control
time elapses. If the temperature difference ∆T between the reference sensors is below
the set value, then the speed is decreased by one stage after the control time elapses.
If the controller has adjusted the speed of the pump down to the smallest stage and
the ∆T between the reference sensors is T∆off, the pump is switched off.
Variant V3: After the purging time the controller switches to the set min. speed. If the
temperature at the reference sensor (collector) is greater than the setpoint to be set
subsequently, then the speed is increased by one stage after the control time expires.
If the temperature at the reference sensor (collector) is less than the setpoint to be set
subsequently, then the speed is decreased by one stage after the control time expires.
Setting range: V1,V2,V3, off/default setting: off
Variant V4: (2 storages)
When the valve is set toward the primary storage, speed control works as in V3.
When the valve is set toward the secondary storage, speed control works as in V2.
Settings range: V1,V2,V3, Off / Default: Off
This function should only be activated by a specialist. Depending on the
pump and pump stage used, the minimum speed should not be set too
low, because otherwise the pump or the system may be damaged. The
information provided by the relevant manufacturer must also be ob-
served! If in doubt, the min. speed and the pump stage should generally
be set to high rather than too low.
Caution
Speed control settings continued on page 42
Special functions
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