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Note: The night-time duty function is deacti-
vated if the selector switch has been set to
speed I, II or III.
6.4 Pump control
During operation, the pump head will be
changed according to the principle "propor-
tional-pressure control". In this control mode,
the pump performance, and consequently the
power consumption, is adjusted to the actual
water requirement.
An example is shown in
. In the example, the
pump duty point is changed from (1) to (2) be-
cause of a changed system characteristic
(thermostatic valves are closed) and conse-
quently a lower water requirement.
7. Technical data
Supply voltage: 1 x 230 V –10%/+6%, 50 Hz,
PE.
Motor protection: The pump requires no exter-
nal motor protection.
Enclosure class: IP 42.
Insulation class: F.
Relative air humidity: Maximum 95%.
Ambient temperature: 0°C to +40°C.
Temperature class: TF110 to CEN 335-2-51.
Liquid temperature: +2°C to +110°C.
Pumps in domestic hot-water systems:
+15°C to +60°C.
To avoid condensation in the terminal box and
the stator, the pumped liquid temperature must
always be higher than the ambient tempera-
ture. See the table:
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