ENGLISH
GB
17
-
Primary circuits with high load losses
-
Domestic water recirculating systems with thermostatic valves on the rising col-
umns
8.1.2 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
-
Two-pipe systems with thermostatic valves and head ≤ 2 m
-
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 col-
umns.
8.1.3 Regulation with constant curve
In this regulating mode the circulator works on characteristic curves
at a constant speed. The operating curve is selected by setting
the rotation speed through 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 circu-
lator model.
The rotation speed may be set from the display or by an external
signal 0-10V or PWM.
Regulation indicated for heating and conditioning plants with constant flow.
8.1.4 Regulation with Constant and Proportional Differential Pressure depending
on the Water Temperature
In this regulating mode the regulating set point
Hs is reduced or increased according to the wa-
ter temperature. THs may be set from 0ºC to 100
ºC in order to allow operation in both heating and
conditioning plants.
H
Q
limite
massimo
maximum limit
A
s well as being at a high temperature and pressure, the fluid in the sys-
tem may also be in the form of steam. DANGER OF SCALDING!
It is dangerous to touch the circulator. DANGER OF SCALDING!
Once all the electrical and hydraulic connections have been made, fill the system with
water and if necessary with glycol (for the maximum glycol percentage see par. 2) 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.10).
8. FUNCTIONS
8.1 Regulating Modes
EVOPLUS circulators allow the following regulating modes depending on plant require-
ments:
-
Proportional differential pressure regulation depending on the flow present in the
plant.
-
Proportional differential pressure regulation with set-point depending on the exter-
nal signal 0-10V or PWM.
-
P
roportional differential pressure regulation depending on the flow 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 depending on the
liquid temperature.
-
Regulation with constant curve.
-
Regulation with constant curve with rotation speed depending on the external sig-
nal 0-10V or PWM.
The regulating mode may be set through the EVOPLUS control panel (see par. 10).
8.1.1 Regulation with Proportional Differential Pressure
In this regulating mode the differential pressure is reduced or in-
creased 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
-
Two-pipe systems with thermostatic valves and head ≥ 4 m
-
Plants with secondary differential pressure regulator
