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The charts in fig.18-18d show the prevalence of the circulator for each speed of the hydraulic circulator and
the load losses inside the machine from which the residual prevalence at the connections of the machine
must be obtained, expendable on the system.
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 Tower is equipped with one high-efficiency cir-
culation 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 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 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 op-
eration 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 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 and 800 µS/cm
• Total hardness: ............................................................................... included between 5 and 20 °F
• Total iron: ........................................................................................ lower than 0,2 ppm
• Manganese: .................................................................................... lower than 0,05 ppm
• Chlorides: ....................................................................................... lower than 250 ppm
• Sulphur ions: .................................................................................. absent
• Ammonia ions: ................................................................................ absent
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.
In case of danger of frost, empty the system and insert antifreeze liquid in a percentage compliant
with the minimum reachable temperatures.
EN - 20
(fig.18a-18b-18c
SHERPA 4/6/8/10 kW
SHERPA 12/14/16 kW
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