The grey
side of the
ECL Card
Ex
tended ser
vic
e
The grey
side of the
ECL Card
Ex
tended ser
vic
e
Service parameter(s) 36
32j
32k
Service parameter(s) 37
36 Return temperature influence - min. limitation
Circuit
Setting range
Factory setting
I / II
-9.9 ... 0 ... 9.9
0.0 / 0.0
Set the influence from the return temperature on the desired flow
temperature.
Set the influence of the min. return temperature
limitation (set in line 30 or lines 31-34).
Influence higher than 0:
The desired flow temperature is increased, when
the return temperature gets below the set limit.
Influence lower than 0:
The desired flow temperature is decreased, when
the return temperature gets below the set limit.
0
Influence
Min. limitation > 0
Return limit Return temp.
Min. limitation < 0
Example
The return limit is active up to 50 °C.
The influence is set to -3.0.
The actual return temperature is 2 degrees too low.
Result:
The desired flow temperature is changed by -3.0 x 2 = -6 degrees.
Normally, the setting in line 36 is 0 in district heating systems
because a lower return temperature is acceptable.
Typically, the setting in line 36 is higher than 0 in boiler systems to
avoid a too low return temperature (see also line 35).
37 Time constant for return temperature limitation
Circuit
Setting range
Factory setting
I / II
OFF / 1 ... 50
25 / 25
Controls how fast the actual return temperature adapts to the
desired return temperature limitation.
Adjust the time constant for the return limitation.
The setting will eliminate the difference
between the acceptable and the actual return
temperature.
The difference is integrated to adjust the desired
flow temperature.
OFF:
The desired flow temperature will not be
adjusted any further.
1:
The desired flow temperature will be
adjusted quickly.
50:
The desired flow temperature will be
adjusted slowly.
