Face F: as indicated by the label to be removed, the 1" cap next to the word "IN" on face C has a dual function: in the case of horizontal installation,

the outlet that is closed by the cap acts as the system's loading door (see below "loading operations", par. 2.2.3); in the case of vertical installation,

the same outlet can act as the input hydraulic connection (exactly like the one marked "IN" on face C and as an alternative to it). The other 1" cap

gives access to a second delivery connection that can be used at the same time as or alternatively to the one indicated with "OUT" on face C. The

user interface panel is composed of a display and a keyboard and its function is to set the system, query its status and communicate any alarms.

The door closed by 2 screws gives access to a special maintenance compartment: cleaning of the non-return valve and resetting of the tank

preload pressure.

The system can be installed in 2 different configurations: horizontal (Fig.4) or vertical (Fig.5).

1.2 Description of the Integrated 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.

or the configuration of the parameters see chapters 4-5.

1.3 Integrated Expansion Vessel

The system is complete with an integrated expansion vessel with a total capacity of 1 litres. The main functions of the expansion vessel are:

• to make the system elastic so as to protect it against water hammer;

• to ensure a water reserve which, in the case of small leaks, maintains the pressure in the system for a longer time and spreads out needless

restarts of the system which otherwise would be continuous;

• when the utility is turned on, ensure the water pressure for the seconds that the system takes to switch on and reach the correct rotation

speed.

It is not a function of the integrated expansion vessel to ensure a water reserve such as to reduce interventions of the system (requests from the

utility, not from a leak in the system). It is possible to add an expansion vessel with the capacity you prefer to the system, connecting it to a point

on the delivery system (not a suction point!). In the case of horizontal installation it is possible to connect to the unused delivery outlet. When

choosing the tank, consider that the quantity of water released will also depend on the parameters SP and RP that can be set on the system

(chapters 4-5).

The expansion vessel is preloaded with pressurised air through the valve accessible from the special maintenance compartment (Fig.1, Face F).

The preload value with which the expansion vessel is supplied by the manufacturer is in agreement with the parameters SP and RP set as default,

and anyway it satisfies the following equation:

Pair = SP – RP – 0.7 bar

So, by the manufacturer:

If different values are set for the parameters SP and/or RP, regulate the valve of the expansion vessel releasing or letting in air until the above

equation is satisfied again (e.g.: SP=2.0bar; RP=0.3bar; release air from the expansion vessel until a pressure of 1.0 bar is reached on the valve).

Figure 4

Where: