ENGLISH
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11. FUNCTIONS
11.1 Regulating Modes
EVOSTA2, EVOSTA2d circulators allow the following regulating modes depending on plant requirements:
− Proportional differential pressure regulation depending on the flow present in the plant.
− Constant differential pressure regulation.
− Regulation with constant curve.
The regulating mode may be set through the EVOSTA2, EVOSTA2d control panel.
11.1.1 Regulation with Proportional Differential Pressure
In this regulating mode the differential pressure is
reduced or increased as the demand for water
decreases or increases.
The Hs set point may be set from the display.
Regulation indicated for:
– Heating and conditioning plants with high
load losses
– Plants with secondary differential pressure
regulator
– Primary circuits with high load losses
– Domestic water recirculating systems with
thermostatic valves on the rising columns
11.1.2 Regulation with Constant Differential Pressure
In this regulating mode the differential pressure is
kept constant, irrespective of the demand for water,
The Hs set point may be set from the display.
Regulation indicated for:
–
Heating and conditioning plants with low
load losses
– Single-pipe systems with thermostatic
valves
– Plants with natural circulation
– Primary circuits with low load losses
– Domestic water recirculating systems with
thermostatic valves on the rising columns
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