User manual

37
741.011 | 12.18
EN
1)
Notice
Standard pump: Set AC!
High-efficiency pump: Set HE!
External consumer (e.g. 230 V relay): Set AC pump type!
11.3.13 Differential thermostat
T
T
F
unc
SET
off
Switches output R1 on and off as follows – time restricted and depend-
ing on the set temperature difference between 2 selectable sensors:
When the temperature difference exceeds T
diff on
, the output is switched
on until the temperature difference drops below T
diff off
. In addition to
this, the discharging of the heating source can be limited to a particular
temperature range (T
src min.
/T
src max.
) and the loading of the heating target
can be limited to a maximum value(T
sink max.
).
Time restriction: The function is executed when the current time lies
within one of 3 configurable time windows.
Speed control of the pump can be activated as required. The loading
strategy of the speed control system attempts to regulate the tempera-
ture difference to match the switch-on temperature difference that has
been set.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
Pump type AC, HE
1) 2)
AC
Pump characteristics (only HE) AA, Ab, C (see p. 15)
–
Speed control on, oFF
2)
oFF
Minimum speed (only AC) 30 % 100 % 50 %
Minimum speed (only HE + AA) 0 % 100 % 25 %
Minimum speed (only HE + Ab) 0 % 100 % 75 %
Heat source sensor input 1 ... 5 –
Heat sink sensor input 1 ... 5 –
Switch-on temperature difference
T
diff on
T
diff off
+ 2 K 80 K 6 K
Switch-off temperature difference
T
diff off
0 K T
diff on
– 2 K 3 K
T
F
unc
SET
C
max
Heat source max. temperature
T
src max.
T
src min.
+ 2 K 180 °C 100 °C
T
F
unc
SET
C
min
Heat source min. temperature
T
src min.
0 °C T
src max.
– 2 K 0 °C