ENGLISH
11.
FUNCTIONS
11.1
Regulating Modes
EVOSTA2, EVOSTA3 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, EVOSTA3 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
11.1.1.1
Regulation with Proportional Differential Pressure –Advanced Menu
6
5
4
3
2
1
Holding down the Mode key for 20" gives access to the
Advanced Menu with the possibility of selecting from 6 curves with proportional differential pressure
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11.1.2
Regulation with Constant Differential Pressure
ENGLISH
11.1.3
Regulation with constant curve
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
45
In this regulating mode the circulator works on characteristic curves at a constant speed.
Regulation indicated for heating and conditioning plants with constant flow.
