Electrical Connection - Xylem Lowara GRUPPOSFERA Instrucciones Para La Instalación Y El Uso

5.2 Suction and delivery pipes
See fig. 1 on page 30.
6. Start-up

6.1 Electrical connection

6.1.1 Grounding
The installation technician must make sure that the supply network is grounded in compliance with local regulations.
6.1.2 Differential switch protection
We recommend that a high sensitivity differential switch (30 mA) be installed as extra protection against lethal
electric shocks in the event of faulty grounding.
6.1.3 Connection
ATTENTION
Connect the pump to the mains using a multiple-pole switch or other device that ensures multiple-pole disconnection
from the mains (interruption of all the supply wires except for the ground wire) with a contact separation of at least 3
mm. All the single-phase pumps are equipped with a built-in automatic reset overload protection, therefore no
external protections are necessary. Remove the pressure switch cover by first loosing the fastening screws. Carry
out the connections as shown in fig. 2-3 (single-phase version).
6.1.4 Version with power cord and plug
For models fitted with power cord and plug, the pump must be installed in such a way that the plug and socket are
always accessible, in case it should be necessary to deactivate the pump.
If the power cord is damaged, call a customer service centre or qualified technician to have it replaced.
6.2 Priming
ATTENTION
Fill both the suction pipe and the pump body with water through the fill plug on the side of the delivery port.
Carry out this operation carefully to prevent formation of air pockets inside the suction pipe or the pump body. Start
the pump with the delivery on-off valve closed (fig. 1). After a few seconds check the pressure on the gauge. If the
pressure increases, let the pump run until the pressure switch stops it. If the pressure does not increase stop the
pump, re-prime it and then start it again. The pressure switch has been set at the factory. The factory setting can be
modified following the instructions of the pressure switch manufacturer. In this case, adjust the air pre-loading inside
the tank to a value of 20 kPa (= 0,2 bar) less than the new minimum pressure setting.
ATTENTION
7. Maintenance
The pump does not require any regularly scheduled maintenance (see pump handbook).
All maintenance operations should be carried out by skilled and qualified personnel.
You should check the air pre-loading at least once a year with the pump down and the system empty.
8. Troubleshooting
If the malfunction is not included in the chart below or is marked by an asterisk, please contact a service
centre near you.
Ground the pump before making any other connection.
Make sure that the supply voltage corresponds to the voltage indicated on the pump's
rating plate.
The pump must be filled with water before you start it. Dry running would damage the
mechanical seal and impeller.
Frost can damage the pump if it remains full and inactive at freezing temperatures.
Make sure that the pump is disconnected from the power supply before carrying out any
maintenance operations.
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