For the proper operation of an underground system supplied with water from the mains, a well or a tank, we recommend using a minimum pressure of 3 bars and minimum flow rate of 25-30 l/min.

Screw a pressure gauge onto the tap’s threaded outlet. The value obtained is the static pressure.

Measure the time required for a container of known capacity to fill, then do this simple calculation: \[{Capacity\ of\ container\ (es. 10 l) \over Time\ required\ (e.g.\ 20 s)} × 60\]

Where adequate water is not available, there are three alternatives:
- Consider installing a “Colibrì System” (providing the requirements are fulfilled, see the section on the subject).
- Consider installing an above-ground system.
- Follow the procedure shown below:
- provide a tank with the equivalent capacity or a greater capacity than the quantity of water required at least for full watering of the garden;
- connect it to a supply source (e.g. water mains, rain water);
- install a pump (even one on the surface) with a power averaging 1-1.5 HP, with a hydraulic head of not less than 35-40 m, which must be matched by a flow rate in relation to the anticipated water consumption of the sprinklers installed.

Be careful of a drop in pressure in the hoses: in this table you will find the values to subtract from the static pressure available upstream. The resultant dynamic pressure must be sufficient to allow the sprinklers to operate as expected.

No, the solenoid valves work even where there is dampness or water.

With 24V AC solenoid valves, if a 1.5 mm² section cable is used (recommended in every case), it is possible to reach significant distances, even more than 100 m, and a maximum of 350 m. With 9V DC solenoid valves, if a 1.5 mm² section cable is used, we recommend not going beyond about 20 m.

There is no difference in terms of operation. What is important is that the direction of the arrow shown is respected. It must point towards the sprinklers.

We do not recommend using insulating tape, just connectors or waterproof terminals to prevent the wires from oxidising.

When the water supply comes from wells or surface water courses.

As a rule, our advice is as follows: 25 mm max 35 m, 32 mm max 50-60 m.

There is no exact number; it depends purely on the water availability.

No, the pressure given on the label is the sprinkler’s actual dynamic pressure, which will be lower than the starting pressure.

No, because each system has a different performance and water consumption, so it would be impossible to determine the correct watering time for each one. The outcome would be that some areas of the garden would get too much watering, and others not enough. The best solution is to create different lines, each for a different watering system.

In these cases, it is not necessary to remove the system, just further subdivide the watering lines, thus increasing their number, so as to reduce the water consumption of each line.

It is always advisable to install a drainage valve in underground systems, to prevent any problems relating to low temperatures. However, make sure it is always located at the lowest point in the line.

- Check the electrical connections with the timer.
- Alternatively impurities may have got into the valve. Clean the internal parts with water and vinegar.
- The solenoid valves’ not closing might be caused by their being installed without respecting the direction of flow of the water as shown by the arrow printed on the valve’s body. In this case take the solenoid valve to the service centre for repair.
- If tees have been used for installation (code 90808), check that the red plugs have been removed.

This can happen with couplings if PE hoses are cut on the diagonal rather than the perpendicular. Also, it is recommended that the hose is pushed as far as possible into the coupling. Problems with the valve might be caused by impurities in the hoses. It is recommended that you run the water before connecting the valve.

The pressure is inadequate. The pressure must be increased if possible (use the pressure regulator, if there is one), or the line flow rate reduced by removing some sprinklers.

Impurities may have got into the system. Clean thoroughly with water and vinegar.