Grundfos CRE Series Installation And Operating Instructions Manual page 23

Guidelines for setting of PI controller
The table below shows the recommended controller settings:
System/application
Heating
system
p
p
Q
0.5
t
L2
L2
L2
L2
t
0.5
L1
L1
K
p
T
Cooling i
1) 2)
system
0.5 0.5
0.1 0.5
0.5 0.5
-0.5 10 + 1.52L2
10 + 1.52L2
0.5
-0.5 30 + 1.52L2
0.5 0.5
L1 < 16.4 ft:
0.5
L1 > 16.4 ft:
0.5
3
L1 > 32.8 ft:
5
+2.5 100
1)
Heating systems are systems in which an increase in pump
performance will result in a rise in temperature at the sensor.
2)
Cooling systems are systems in which an increase in pump
performance will result in a drop in temperature at the sensor.
L1 = Distance [ft] between pump and sensor.
L2 = Distance [ft] between heat exchanger and sensor.
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