Grundfos TPE - Page 23

English (GB)
23
10.4.4 Constant differential temperature
The pump maintains a constant differential temperature in the
system and the pump performance is controlled according to this.
See fig. 28.
Fig. 28 Constant differential temperature
This control mode requires either two external temperature
sensors or one external differential-temperature sensor as shown
in the examples below:
Fig. 29 Constant differential temperature
10.4.5 Constant flow rate
The pump maintains a constant flow in the system, independently
of the head. See fig. 30.
Fig. 30 Constant flow rate
This control mode requires an external flow sensor as shown in
the example below:
Fig. 31 Constant flow rate
10.4.6 Constant level
The pump maintains a constant level, independently of the flow
rate. See fig. 32.
Fig. 32 Constant level
This control mode requires an external level sensor.
The pump can control the level in a tank in two ways:
• as an emptying function where the pump draws the liquid from
the tank.
• as a filling function where the pump pumps the liquid into the
tank.
See fig. 33.
The type of level control function depends on the setting of the
built-in controller. See section 10.11
Controller settings .
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Examples
• Two external temperature sensors.
• One external differential-temperature sensor.
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Example
• One external flow sensor.
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