Grundfos TPE2 Installation And Operating Instructions Manual page 32

17.6.5 "Constant temperature"
Pump variant
TPE3, TPE3 D
TPE2, TPE2 D
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. See fig. 41.
H
Fig. 41 Constant temperature
This control mode requires either an internal or external
temperature sensor as shown in the examples below:
Examples
• Factory-fitted temperature sensor (only TPE3, TPE3 D).
t
• One external temperature sensor.
t
Fig. 42 Constant temperature
Controller settings
For recommended controller settings, see section
17.18 "Controller"("Controller settings").
32
"Constant temperature"
●
●
t
Q
t
17.6.6 "Constant differential pressure"
Pump variant
TPE3, TPE3 D
TPE2, TPE2 D
The pump maintains a constant differential temperature in the
system and the pump performance is controlled according to this.
See fig. 43.
H
Fig. 43 "Constant differential pressure"
This control mode requires either an internal or external
differential-pressure sensor or two external pressure sensors as
shown in the examples below:
Examples
• Factory-fitted differential-pressure sensor. Only TPE3, TPE3
D.
p
• One external differential-pressure sensor.
The pump uses the input from the sensor to control the
differential pressure.
You can set sensor manually or by using the Assist menu.
See section 17.48 Assisted pump
p
• 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 section
17.48 Assisted pump setup.
p
p p
Fig. 44 "Constant differential pressure"
"Constant differential
pressure"
●
●
Q
setup.
p
p
p
p