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The circulation of the minimum content of the conditioning system be ensured even if the valves
in the system are closed.
3.2.3 - Circulation pumps
The pumps are controlled through PWM, so as to set the
fixed number of revolutions for pump operation.
Sherpa Aquadue is equipped with one high-efficiency
circulation pump. The pumps with permanent magnet wet
rotor have an electronic adjustment module with integrated
frequency converter. On the adjustment module is present
a control knob.
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 set factory set at a con-
stant 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 necessary 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 polyeth-
ylene foam or similar materials. The non-return valves, the bends and the various
fittings shall also be insulated 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 pump, please see paragraph 5.8.9
3.3 - SYSTEM WATER REFERENCE VALUES
• pH: ................................6,5 ÷ 7,8
• Electrical conductivity: ..included between 250
• Total hardness: .............included between 5 and
If total hardness is higher than 20°F or if some reference values of make-up water do not respect the indicated
limits, please contact our pre-sale service to determine the treatments to be implemented.
Well or aquifer water not coming from an aqueduct must always be carefully analysed and, if necessary,
treated with opportune treating systems. In case of installation of a softener, in addition to following the pre-
scriptions of the manufacturer, adjust outlet water hardness not below 5°F (also carrying out pH and salinity
tests) and check the concentration of outlet chlorides after resins regeneration.
EN - 20
(fig.18a-18b-18c)
and 800 µS/cm
20 °F
SHERPA 12/14/16 kW
• Total iron: ......................lower than 0,2 ppm
• Manganese: ..................lower than 0,05 ppm
• Chlorides: .....................lower than 250 ppm
• Sulphur ions: ................absent
• Ammonia ions: ..............absent
SHERPA 4/6/8/10 kW
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