Grundfos TPE3 - Page 28

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28
15.4.5 Constant temperature
This control mode ensures a constant temperature.
Constant temperature is a comfort control mode that can be used
in domestic hot-water systems to control the flow to maintain a
fixed temperature in the system. See fig. 41. When this control
mode is used, no balancing valves must be installed in the
system.
Fig. 41 Constant temperature
This control mode requires either an internal or external
temperature sensor as shown in the examples below:
Fig. 42 Constant temperature
15.4.6 Constant differential pressure
The pump maintains a constant differential pressure,
independently of the flow in the system. See fig. 43. This control
mode is primarily suitable for systems with relatively small
pressure losses.
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:
Fig. 44 Constant differential pressure
Pump variant Constant temperature
TPE3 (D) ●
TPE2 (D) ●
TM05 7900 1613
Examples
• Factory-fitted temperature sensor (only TPE3 (D)).
• One external temperature sensor.
H
Q
t
t
t
t
Pump variant
Constant differential
pressure
TPE3 (D) ●
TPE2 (D) ●
TM05 7901 1613
Examples
• Factory-fitted differential-pressure sensor (only TPE3 (D)).
• One external differential-pressure sensor.
• Two external pressure sensors.
H
Q
p
p
p
p
p
p
p
p
p