The power supply cables must never ever be twisted, pulled or sharply bent (the minimum curving radius must be 5 times greater than the cable diameter).

The free ends of the cables must be carefully protected against possible infiltrations of water or moisture. During installation, it is particularly necessary

Ensure that the free ends of the cables are never able to come into contact with water.

ATTENTION

Particular attention must also be paid to the condition of the cable. Even tiny roughened parts can cause liquid to penetrate into

the motor compartment!

Before starting the unit in installations liable to freeze, always check that the motor is free to turn and that the pumped liquid is free

to flow.

For electric pumps K...N1/X1, in case of cable replacement (L60), the screws (L54) securing the cable gland (L25) must be fastened with a torque of

8 Nm; the correct compression of the cable seal (L38) is obtained with a torque wrench, and by modifying, if necessary, the number of growers (L47)

located inside the cable gland housing (number of growers 1) for references L... see chapter "Section and nomenclature".

For electric pumps K...N3/X3, please refer to the annex proving the assembly and disassembly instructions for connector page 123.

Recommendations when building the system

All the safety precautions established by the current laws in force must be complied with when building the accumulation chamber. In particular:

- if the pumped liquid contains, or could give rise to explosive gaseous mixtures, always check that the accumulation tank is well ventilated and that it

does not allow gas to stagnate. The electric pump and relative accessories must be of suitable construction and fit for environments with potentially

explosive atmospheres.

- The electrical equipment installed outside the trap must be protected against inclement weather conditions and possible gas infiltrations from the

trap itself.

- The size of the accumulation chamber must be such as to balance three requirements:

a) the working volume must be such as to limit the number of starts/hour (see utilization features);

b) the time the pump remains at a standstill must be such as to prevent the formation of hard sediments;

c) the minimum immersion depth must allow the motor to be completely submersed, or compliance with NPSH in case of cooling system activated.

The maximum immersion depth must not exceed 20 m.

- The base for the automatic pump coupling must be firmly fixed to the bearing surface.

- The electric pump intake must always be in the lowest part of the accumulation chamber.

- The fluid reaching the accumulation chamber must not create turbulence as could allow the pump to suck air.

- To prevent obstructions and clogging, it is advisable to check that the speed of the fluid through the delivery pipe is always more than 0.8 ÷ 1 m/s.

When the fluid contains sand, a speed of at least 1.6 m/s is required through horizontal pipes and 2.5 m/s in vertical pipes. To reduce load losses

and wear, it is advisable to never exceed 4 m/s.

- The vertical discharge pipe sections must be reduced to the minimum and the horizontal sections must slightly slope downwards in the direction of flow.

- Cast iron valves are normally used for general requirements with sewage. From a constructional aspect, it is preferable to install a clapet check valve

and flat sluice valves.

- Install a check valve when the delivery pipeline is long.

- When installed on the discharge pipe, the check valve must be mounted if possibly in horizontal sections and in an easily accessible position.

WRONG

PERMISSIBLE

CORRECT

Caprari S.p.A.

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