31
Special functions
6.5.4.3. -
∆T return fl ow
Switch-on temperature difference:
When this difference is exceeded between return fl ow sensor and storage sen-
sor, the relay is switched on.
Switch-off temperature difference:
When this difference is exceeded between return fl ow sensor and storage sen-
sor, the relay is switched off.
6.5.4.4. -
Return fl ow (sensor)
Determines the sensor for return fl ow increase.
6.5.4.5. -
Storage (sensor)
Determines the storage sensor
R
el
ay
fu
nc
tion
s
6.5.5. - Field cooling
This function controls an external coolig unit to cool down the collector.
If this temperature is exceeded at the reference sensor, the relay is switched on.
6.5.5.2. -
Tmax fi eld
When the temperature falls below Tmax fi eld +Hys min, the relay is switched off.
6.5.5.3. - Hys min
To protect the cooling unit itself from damage, the relay is switched off as soon
as the temperature at the reference sensor reaches Tmax fi eld + Hys max
6.5.5.4. - Hys max
Reference sensor of the collector fi eld cooling function.
This function does not activate the solar pump to cool the collec-
tor. Therefore, please refer to the collector protection.
Caution
6.5.5.5. - Field cooling sensor