Grundfos TPE 2 Series - Constant Differential Temperature; Constant Flow Rate

English (GB)
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14.5.7 Constant differential temperature
The pump maintains a constant differential temperature in the
system and the pump performance is controlled according to this.
See fig. 46.
Fig. 46 Constant differential temperature
This control mode requires either two temperature sensors or one
external differential-temperature sensor as shown in the
examples below.
The temperature sensors can either be analog sensors
connected to two of the analog inputs or two Pt100/Pt1000
sensors connected to the Pt100/1000 inputs, if these are
available on the specific pump.
The setup of the sensor can be made in the "Assist" menu under
"Assisted pump setup". See section 14.44 Assisted pump setup.
Fig. 47 Constant differential temperature
Controller settings
For recommended controller settings, see section
14.15 Controller (Controller settings).
14.5.8 Constant flow rate
The pump maintains a constant flow in the system, independently
of the head. See fig. 48.
Fig. 48 Constant flow rate
This control mode requires an external flow sensor as shown
below:
Fig. 49 Constant flow rate
Controller settings
For recommended controller settings, see section
14.15 Controller (Controller settings).
Pump variant
Constant differential
temperature
TPE3, TPE3 D 
TPE2, TPE2 D 
TM05 7954 1713
Examples
• Factory-fitted temperature sensor and an external
temperature sensor (only TPE3, TPE3 D).
• Two external temperature sensors.
Constant differential-temperature control is achievable with
two temperature sensors. The pump uses the inputs from the
two sensors and calculates the differential temperature.
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 section
14.44 Assisted pump setup.
• One external differential-temperature sensor.
The pump uses the input from the sensor to control the
differential temperature.
You can set the sensor manually or by using the "Assist"
menu. See section 14.44 Assisted pump setup.
H
Q
△t
t
t
t
t
t
t
t
Pump variant Constant flow rate
TPE3, TPE3 D -
TPE2, TPE2 D 
TM05 7955 1713
Example
• One external flow sensor.
H
Q
Q
set
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