Regulating Modes; Functions; Regulation With Proportional Differential Pressure - Saci pumps EVOPLUS SMALL Instructions Pour L'installation Et La Maintenance

9. START
All the starting operations must be performed with the cover of the EVOPLUS SMALL
control panel closed.
Start the system only when all the electrical and hydraulic connections have been
completed.
Avoid running the circulator when there is no water in the system.
As well as being at a high temperature and pressure, the fluid in the system 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. 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 SMALL 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 EVOPLUS SMALL control panel (see par. 12 Page 2.0).

10.1.1 Regulation with Proportional Differential Pressure

ENGLISH
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
– Two-pipe systems with thermostatic valves and head ≥ 4 m
Plants with secondary differential pressure regulator
–
– Primary circuits with high load losses
Domestic water recirculating systems with thermostatic valves on the
–
rising columns