Grundfos NBE Series - 7.5.3 Constant temperature; 7.5.4 Constant differential pressure

7.5.3 Constant temperature
Pump variant Constant temperature
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with Delta ρ sensor
●
This control mode ensures a constant temperature. Constant
temperature is a comfort control mode that you can use in domestic
hot-water systems to control the flow to maintain a constant
temperature in the system.
H
Q
t
TM057900
Constant temperature
This control mode requires an external temperature sensor as
shown in the example below.
Example:
• One external temperature sensor
t
TM057884
t
TM057885
Controller settings
For the recommended controller settings, see the section on the
controller.
7.5.4
Constant differential pressure
Pump variant Constant differential pressure
NBE, NKE, NBSE, VLSE ●
NBE, NKE, NBSE Series
2000; VLSE with Delta ρ sensor
●
The pump maintains a constant differential pressure, independently
of the flow rate in the system. This control mode is primarily suitable
for systems with relatively small pressure losses.
H
Q
TM057901
Constant differential pressure
The setting range is between 12.5 % and 100 % of maximum head.
This control mode requires either an internal or external differential-
pressure sensor or two external pressure sensors as shown in the
examples below.
Example:
• Factory-fitted differential-pressure sensor.
Δp
TM057880
• One external differential-pressure sensor.
The pump uses the input from the sensor to control the
differential pressure.
You can set the sensor manually or by using the Assist menu.
See the section on assisted pump setup.
Δp
TM057886
Δp
TM057887
• Two external pressure sensors.
Constant differential-pressure control is achievable with two
individual pressure sensors. The pump uses the inputs from the
two sensors and calculates the differential pressure.
The sensors must have the same unit and must be set as
feedback sensors. You can set the sensors manually, sensor by
sensor, or by using the Assist menu. See the section on
assisted pump setup.
p
p
p
TM057888
p
p
Δp
TM057889
Controller settings
For recommended controller settings, see the section on the
controller.
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