07/2015
Temperature Difference Controller TDC 3
Page 30 of 47
5.7
∆
T R2
Switch-on/Switch-off temperature difference for relay R2
If this temperature difference between the reference sensors is exceeded and the other conditions
are also met, then the controller switches the pump and/or the valve on. When the temperature
drops to
∆
T Off, then R1 is switched off.
Settings range:
∆
T from 4 °C to 20 °C /
∆
TOff from 2 °C to 19 °C
Settings range:
∆
T 10 °C /
∆
T off 3 °C.
5.8 Tset S3
Thermostat function at sensor 3
If the temperature at sensor 3 exceeds this value (+hysteresis) the corresponding relay is switched
off. If the temperature at sensor 3 falls below this value and the other conditions are also met, the
corresponding relay is switched on.
Setting range: from 0 °C to 99 °C/default setting: 60 °C
5.9 Hysteresis
Hysteresis for thermostat function at sensor 3
By setting the hysteresis value the heating of the storage tank can be adjusted.If the temperature
of the Tsetpoint at sensor 3 is exceeded by the set hysteresis, additional heating at relais 2 is
deactivated. If the Energy saving mode is active (see 5.16) the system heats up until
hysteresis temperature is reached.
Setting range: from 2 °C to 20 °C/default setting: 10 °C
Caution
Setting the temperature difference too small may lead to ineffective operation
of the system and to frequent switching of the pump, depending on the system
and sensor positions.
Caution
Danger
Temperature values which are set too high can lead to scalding or damage to
the system. Scalding protection must be provided by the customer!
In Energy saving mode other settings may apply, e.g. TecoS3, see 5.16
