Danfoss C67, User Manual

Page: 53 / 84

The grey
side of the
ECL Card
Ex
tended ser
vic
e
31-34 Return temperature limitation
The return temperature limitation is based on the outdoor
temperature. Typically in district heating systems a
higher return temperature is accepted at a decrease in
outdoor temperature. The relationship between the return
temperature limits and outdoor temperature is set in two
coordinates.
The upper limit coordinate is set in lines 31 and 32 and the
lower limit coordinate in lines 33 and 34.
80
60
40
20
-15 0 +15
T
return
Line 34
Line 32
Lower limit
Upper limit
Line 33 Line 31
T
out
Service parameter(s) 30-34
32g
30 Return temperature limitation
Circuit Setting range Factory setting
I 10 ... 110 °C 60 °C
Set the return temperature you accept for the heating / DHW
circuit.
Set the acceptable return temperature limit.
When the return temperature falls below or gets higher
than the set value, the controller automatically changes the
desired flow temperature to obtain an acceptable return
temperature. The influence is set in lines 35 and 36.
For some applications the return temperature limitation for
heating circuits is set in lines 31-34 (outdoor temperature
dependent limitation).