Grundfos CRE Series User Manual

Constant
temperature
K
p
T
i
Heating
system
Cooling
system
L2
t
0.5 -0.5 30 + 5L2
10)
In heating systems, an increase in pump performance
results in a rise in temperature at the sensor.
11)
In cooling systems, an increase in pump performance
results in a drop in temperature at the sensor.
L2: Distance in metres between the heat exchanger
and the sensor.
Constant differential
temperature
K
p
T
i
t
L2
-0.5 10 + 5L2
t
t
t
L2
L2: Distance in metres between the heat exchanger
and the sensor.
Constant flow rate
K
p
T
i
Q
0.5 0.5
Constant pressure
K
p
T
i
p
0.5 0.5
p
0.5 0.5
Constant level
K
p
T
i
L
-10 0
Constant level
K
p
T
i
L
10 0
General rules of thumb:
If the controller is too slow-reacting, increase the
gain.
If the controller is hunting or unstable, dampen the
system by reducing the gain or increasing the integral
time.
Factory setting
See the section on factory settings.
Related information
9.58 Factory settings for Grundfos GO
9.17 Operating range
Set the operating range as follows:
1. Set the minimum speed within the range from
fixed minimum speed (5) to user-set maximum
speed (2).
62
English (GB)

Grundfos CRE Series Specifications

General

Motor Type	Asynchronous
Enclosure Class	IP55
Insulation Class	F
Series	CRE
Protection Class	IP55
Material	Stainless Steel
Applications	Water Supply, Pressure Boosting, Irrigation
Pumped liquid	Clean liquids
Approvals	CE
Voltage	380-415V
Connection Size	DN 32 to DN 100
Efficiency	IE3 Premium Efficiency
Power Supply	3-phase
Liquid Temperature Range	-10°C to +120°C
Temperature Range	-10°C to +120°C