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in the system may also be in the form of steam. DANGER OF
SCALDING!
It is dangerous to touch the circulator. DANGER OF SCALDING!
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system with water and if necessary with glycol (for the maximum glycol
percentage see par. 3) and feed the system.
Once the system has been started it is possible to modify the operating
modes to adapt better to the plant requirements (see par.12).
10. FUNCTIONS
10.1 Regulating Modes
EVOPLUS circulators allow the following regulating modes depending on
plant requirements:
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present in the plant.
- Proportional differential pressure regulation with set-point depend-
ing on the external signal 0-10V or PWM.
-
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present in the plant and on the liquid temperature.
- Constant differential pressure regulation.
- Constant differential pressure regulation with set-point depending
on the external signal 0-10V or PWM.
- Constant differential pressure regulation with variable set-point de-
pending on the liquid temperature.
- Regulation with constant curve.
- Regulation with constant curve with rotation speed depending on
the external signal 0-10V or PWM.
The regulating mode may be set through the EVOPLUS control panel
(see par. 12 Page 2.0).
10.1.1 Regulation with Proportional Differential Pressure
In this regulating mode the differential pressure is redu-
ced or increased as the demand for water decreases
or increases.
The Hs set point may be set from the display or by an
external signal 0-10V or PWM.
Regulation indicated for:
- Heating and conditioning plants with high load losses
-
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- Plants with secondary differential pressure regulator
- Primary circuits with high load losses
- Domestic water recirculating systems with thermostatic valves on
the rising columns
10.1.2 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 or by an
external signal 0-10V or PWM.
Regulation indicated for:
- Heating and conditioning plants with low load losses
-
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- 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.
10.1.3 Regulation with constant curve
In this regulating mode the circulator works on cha-
racteristic curves at a constant speed. The operating
curve is selected by setting the rotation speed throu-
gh a percentage factor. The value 100% indicates the
maximum limit curve. The actual rotation speed may
depend on the power and differential pressure limits of
your circulator model.
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maximum limit
