Grundfos TPE2 Installation And Operating Instructions Manual page 35

16.6.3 "Proportional pressure"
Pump variant "Proportional pressure"
TPE3, TPE3 D
TPE2, TPE2 D
The head of the pump is reduced at decreasing
water demand and increased at rising water
demand. See fig. 39.
This control mode is especially suitable in systems
with relatively large pressure losses in the
distribution pipes. The head of the pump increases
proportionally to the flow in the system to
compensate for the large pressure losses in the
distribution pipes.
The setpoint can be set with an accuracy of 0.1
metre. The head against a closed valve is half the
setpoint.
For more information about settings, see section
16.7 "Proportional-pressure
H
H
set
H
set
2
Fig. 39 "Proportional pressure"
Example
• Factory-fitted differential-pressure sensor.
p
Fig. 40 "Proportional pressure"
Controller settings
For recommended controller settings, see section
16.17 "Controller" ("Controller
●
-
setup".
Q
settings").
16.6.4 "Constant pressure"
Pump variant
TPE3, TPE3 D
TPE2, TPE2 D
We recommend this control mode if the pump is to
deliver a constant pressure, independently of the
flow in the system. The pump maintains a constant
pressure independently of the flow rate. See fig. 41.
H
Fig. 41 "Constant pressure"
This control mode requires an external pressure
sensor as shown in the examples below. You can set
the pressure sensor in the Assist menu. See section
16.46 Assisted pump setup.
Examples
• One external pressure sensor.
p
Fig. 42 "Constant pressure"
Controller settings
For recommended controller settings, see section
16.17 "Controller" ("Controller
Constant pressure
●
●
Q
p
settings").
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