Maintenance; Troubleshooting - Lowara BG series Installations- Und Bedienungsanleitungen

4 Installation (fig. 2 and 3)
When you receive the pump, check the outside of the package for evident signs of damage. If the product bears
visible signs of damage, notify our distributor within 8 days from the delivery date.
This pump is classified as an appliance for fixed installation, permanently connected to the electric mains (EN 60335-
1). Screw the electric pump to a stable base using the slots in the foot. In case of connection to the water system, the
regulations issued by the competent authorities (municipal, public utility company) must be observed. Authorities
often require the installation of a backflow prevention device, such as a disconnector or check valve or disconnection
tank.
Proper installation (fig. 2)
A = eccentric adapters
B = positive slope
C = wide bends
D = suction pipe diameter >= pump port diameter
E = good immersion
F = foot valve (not necessary for BG/BGM models)
G = height difference in suction side (*)
H = pipes must not exert stress on pump but on
independent supports
(*) The suction lift depends on the type of pump (NPSH required by the pump) and on the installation (altitude, flow
resistance into the suction pipe, liquid temperature). See table 10.
5 Electrical connection (fig. 4, 5 and 6)
To connect, proceed as shown on the back of the terminal board cover (anticlockwise rotation) and in fig. 4 for single-
phase versions, fig. 5 for three-phase versions. Use standard 3-wire cables (2+ground) for single-phase versions, 4-
wire cables (3+ground) for three-phase versions. The reference characteristics (voltage, frequency and input current)
are shown on the pump rating plate.
Check the direction of rotation (three-phase models only)
Clockwise rotation when looking at pump from the motor side. Check by looking at the fan or by observing the pump's
performance (in this case the correct direction of rotation is the one that generates the highest pressures and flows).
In the event of incorrect rotation, switch two supply wires.
6 Priming (fig. 7 and 8)
Fill the pump body and suction pipe through the fill plug, bleeding off all the air. For the BG/BGM models, self-priming
without the foot valve may require up to 3-4 minutes. We therefore recommend that you always use a foot valve.
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Maintenance

No scheduled routine maintenance is required. The pump should be serviced by qualified personnel only, after having
been disconnected from the power mains.
For BGM Garden models (with switch and cable with plug assembled in the factory - fig. 9)
If the power cable is damaged it must be replaced by the manufacturer or by their technical assistance service, or
anyway by a person with similar qualifications, so as to prevent any risk.
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Troubleshooting

switch (30 mA) [residual current device RCD].
Disconnect the power supply to the electric pump before carrying out any maintenance,
cleaning or handling operations.
On models supplied with a cable and plug, if the power cable is damaged it must be
replaced by the manufacturer or by their technical assistance service, or anyway by a
person with similar qualifications, so as to prevent any risk.
During operation, the outer surface of the pump (if hot liquids are being pumped) and the
outer surface of the motor can exceed 40°C. Do not touch with parts of your body (e.g.:
hands) and do not put combustible material into contact with the pump.
The single-phase pumps have built-in, automatic reset thermoamperometric protection.
On three-phase pumps, install a protection device with the following characteristics:
voltage 380-415V, input current 10 A.
In accordance with installation regulations, a device must be provided in the fixed supply
system which ensures disconnection from the mains, with a contact opening distance that
allows complete disconnections in current overload conditions category III (except BGM
Garden models which are fitted with a cable and plug).
Improper installation (fig. 3)
1 = tight bend
2 = negative slope
3 = pipe diameter < pump port diameter
4 = insufficient immersion
5 = lack of supports
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