Sorel TDC 2, Installation And Operating Instructions Manual

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12.9 Speed control 

menu 7.9

If the speed control is activated, the TDC2 makes it possible to vary the
speed of standard pumps at relay R1 by means of special internal
electronics.

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

Special functions  

menu 7

12

12

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 maximum

speed. If the temperature difference 

Δ

T between sensor 1 and sensor 2 is

less than the set value, then the speed is decreased by one stage after the
control time elapses. If the temperature difference between sensor 1 and
sensor 2 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 

Δ

T between sensor 1 and

sensor 2 is still only 1/3 of the set value, then the pump is switched off.

Variant V2:

 After the purging time the controller switches to the set min.

speed.  If the temperature difference 

Δ

T between sensor 1 and sensor 2 is

greater than the set value, then the speed is increased by one stage after
the control time elapses. If the temperature difference 

Δ

T between sensor

1 and sensor 2 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 

Δ

T between sensor 1 and

sensor 2 is still only 1/3 of the set value, then the pump is switched off.

Variant V3: 

 After the purging time the controller switches to the set min.

speed.  If the temperature at the sensor 1 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 sensor 1 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

12.9.1 Variant 

menu 7.9.1

damaged. The information provided by the relevant manufacturer must also
be observed! If in doubt, the min. speed and the pump stage should generally
be set to high rather than too low.

Caution