Danfoss C37 User Manual page 50

32j
Service parameter(s) 36
36 Return temperature influence - min. limitation
Circuit
(I) / (II)
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.
Influence
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).
The grey
side of the
ECL Card
Setting range
-9.9 ... 0 ... 9.9
Min. limitation > 0
Min. limitation < 0
Factory setting
(0.0) / (0.0)
Return limit Return temp.