Granit COMFORT Premium C-85 Instrucciones De Instalación Y Mantenimiento página 5

The product is an integrated system consisting of a self-priming, multi-stage centrifugal motor pump, an electronic
circuit for control (inverter) and a filter to remove any incoming impurities.
With reference to Fig.1, the system has the following
user interface points:
1. Suction connection (inlet))
2. Delivery connection (outlet))
3. Port for filling and filter maintenance
4. Drainage port
5. Port for bleeding
maintenance Non-return valve
6. Control panel and status Display
7. Grip for lifting and transport
8. Port for extraordinary maintenance Motor
Shaft
1.1 Built-in inverter
The electronic control integrated in the system is of the type with inverter and it makes use of flow, pressure and
temperature sensors, also integrated in the system. By means of these sensors the system switches on and off
automatically according to the utility's needs and it is able to detect conditions of malfunction, to prevent and indicate them.
The Inverter control ensures different functions, the most important of which, for pumping systems, are the maintaining of
a constant pressure value in delivery and energy saving.

The inverter is able to keep the pressure of a hydraulic circuit constant by varying the rotation speed of the
electropump. In operation without an inverter the electropump is unable to modulate and, when there is an
increase of the request for flow, the pressure necessarily decreases, or vice versa; this means the pressures are
too high at low flow rates or too low when there is an increased request for flow.

By varying the rotation speed according to the instantaneous request of the utility, the inverter limits the power
supplied to the electropump to the minimum necessary to ensure that the request is satisfied. Instead, operation
without an inverter contemplates operation of the electropump always and only at maximum power.
For the configuration of the parameters see chapters
1.2 Integrated electropump
The system has a built-in centrifugal electropump of the multi-impeller type driven by a water-cooled three-phase electric
motor. Cooling of the motor with water rather than air ensures less noise in the system and the possibility of locating it
even in recesses without ventilation. The graph in Fig.2 shows the curve of the hydraulic performance.
By automatically modulating the rotation speed of the electropump, the inverter allows it to shift its work point according to
necessities to any part of the area subtended by its curve, to keep the set pressure valve constant The red curve highlights
the behaviour of the system with setpoint 3,0 bar (43.5 psi).
This means that, with SP = 3,0 bar (43.5 psi), the system is able to ensure a constant pressure to utilities that require flow
rates between respectively 0 and 55 litres/minute (14.5 gpm). For higher flow rates the system works according to the
characteristic curve of the electropump at maximum rotation speed. For flow rates lower than the limits described above,
as well as ensuring constant pressure, the system reduces the absorbed power and therefore the energy consumption.
ENGLISH
and extraordinary
Figure 1
4-5.
Figure 2
3