ENGLISH
38
Provide adequate support for the suction and delivery pipes so that they do not weigh down on the
pump.
Do not make the couplings between the pipes too tight.
Suction pipe diameter > = pump inlet diameter.
If a metal pipe is connected, fit a plastic coupling on the pump inlet.
The suction pipe must be perfectly airtight.
ATTENTION: before connecting the pipes, check that their inside is clean.
To avoid problems in suction, install a foot valve and make a positive slope of the suction pipe
towards the pump.
2.2 Electrical
connection to the supply line
Figure 3
To improve immunity to the possible noise radiated towards other appliances it is recommended to use a separate
electrical duct to supply the product.
Attention: always respect the safety regulations!
Electrical installation must be carried out by an expert, authorised electrician, who takes on all
responsibility.
The system must be correctly and safely earthed as required by the regulations in force.
The mains voltage must be the same as that on the motor data plate.
Connect to the mains with a two-pole switch, with contact opening distance of at least 3 mm.
The thermal magnetic circuit breaker and the power cables must be correctly sized.
The leakage current to earth is max. 3.5 mA. It is recommended to use a type B differential switch. The
system must be adequately sized. The pump must be fed by means of an isolation transformer or a
differential switch, which must have a differential operating current no higher than 30 mA.
The mains terminals may still have dangerous voltage when the motor is stopped and for a few minutes
after disconnecting from the power mains.
The line voltage may change when the electropump is started. The line voltage may undergo variations
depending on other devices connected to it and on the quality of the line.
