Olimpia splendid SHERPA AQUADUE S2 BIG Instrucciones Para La Instalación, Uso Y Mantenimiento página 73

The main circulation pump can be set in three modes (fig.18):
Y1. Constant pressure differential
Y2. Variable pressure differential
Y3. Fixed number of revolutions
Mode Y1 -
Variable pressure difference (Δp-v).
The delivery value of the pressure difference is increased linearly between ½ H and H within the permitted
flow rate range (chart Δp-v).
The value of the pressure difference generated by the pump is adjusted on the set delivery one.
This mode of adjustment is particularly suitable for heating systems with fan coils and radiators, since
the flow rate noise on the thermostatic valves is reduced.
Mode Y2 -
Constant pressure difference (Δp-c).
The delivery value of the pressure difference H is maintained, within the permitted flow rate range, con-
stantly on the set delivery value up to the maximum curve of the characteristic (chart Δp-c).
This mode of adjustment is advised for floor heating systems or older heating systems with large pipes,
but also for all the other applications which do not show variable characteristic curves of the system,
such as boiler load pumps of DHW.
Mode Y3 -
Constant number of revolutions I,II,III.
The circulation pump works as a traditional fixed speed pump but with lower absorbed power.
The DHW pump is equipped with a LED indicator to display the operating status of the pump.
All the functions can be set, activated or deactivated with the control knob.
The circulator of the DHW circuit is factory set at a constant number of revolutions I,II and III. It also may
work in the modes with variable pressure difference and constant pressure difference.
• Check that load losses of the system ensure the required water flow rate (see par. 4.2).
• If higher prevalences should be necessary due to high load losses of the system, it'll be nec-
essary to add a hydraulic separator and an external reactivation pump.
• Check if the system has the minimum required content of water to ensure good operation of
the system; if it is insufficient, add such accumulation so that the required content is reached.
• The water distribution pipelines will have to be insulated adequately with polyethylene foam or
similar materials. The non-return valves, the bends and the various fittings shall also be insu-
lated adequately.
• To avoid air pockets inside the circuit, insert the automatic or manual vent devices in all the
points (highest pipelines, siphons etc.) where air may accumulate.
To set the speed of the pump, see paragraph 5.8.9
EN - 15
AQUADUE BIG