Start-Up; Water Connection; Electrical Connection - Lowara FHF-ATEX3 Serie Instrucciones Suplementarias Para La Instalacion Y El Uso

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6. Start-up

6.1

Water Connection

The water connections must be made by a qualified installation technician in compliance with the regulations in force.

In case of connection to the water system, the regulations issued by the competent authorities (municipal, public utility company,...)

must be observed. These regulations often require the installation of a backflow prevention device, such as a disconnector or check

valve or disconnection tank.

The suction pipe must be perfectly sealed and watertight. If the pump/electric pump is installed near dwellings, suitable pipes or flexible unions should be pro-

vided to prevent the transmission of vibrations from the pump to the pipes. Install on-off valves on the suction and delivery sides to avoid having to drain the

system before maintenance, repair or pump replacement operations can be performed. Whenever necessary, provide a by-pass circuit to prevent the

overheating of the water inside the pump.

Refer to the instructions provided in section 3.1.4.

For additional information refer to the relevant electric pump manual.

After providing for the water connections, remove the motor fan cover and, operating the valve, make sure that the shaft is revolving

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freely. Afterwards replace the fan cover carefully.

If any mechanical components rub against each other, please contact our Sales and Service Department.

6.2

Electrical Connection

The electrical connections must be performed by a qualified installation technician in compliance with the regulations in force.

Make sure that the voltages and frequencies are suited to the characteristics of the electric motor. Refer to the motor rating plates.

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Provide suitable general protection against short circuits on the power line.

Before proceeding, make sure that all the connections (even those that are potential-free) are voltage-free.

Ground the system according to the regulations in force. The selection of the conductors (gauge, sheath material,...) must take into

account the actual operating conditions. Protect the electrical conductors from too high temperatures, vibrations and collisions.

Refer to the motor operating instructions provided with the electric pump.

6.2.1 Cable glands

The motors are normally sold without any cable glands.

Use only the types of cable glands specified in the motor operating instructions.

6.2.2 Overload protection

You must provide the overload protection (thermal relay or motor protector)

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Adjust the thermal relay or motor protector to the nominal current value of the electric pump or to the operating current in case the motor is not used at full

load. If the motor has a star-delta starting system, adjust the thermal relay to a value equal to 58% of the nominal current or operating current.

6.2.3 Overload protection (version powered by a frequency converter)

You must connect the terminals of the PTC or PT100 probes to a release relay in order to stop the motor in case of malfunction.

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For additional information refer to the motor operating instructions.

6.2.4 Protection Against Dry Running

Avoid the possibility of dry running, i.e. the pump must not run without water inside it. Make sure that a suitable dry running protection

system is installed.

6.2.5 Grounding (FHF versions with painted pump casing)

The paint might act as an electrical isolator. If you think that buildup of electrostatic charges inside the pump casing must be preven-

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ted, connect the pump casing to the equipotential line.