Electrical Connections - Franklin Electric 3 Bedienungs- Und Installationsanleitung

2 .2 Temperature of pumped fluids
The pumped liquids must remain within certain
temperature limits:
• with EPDM seals: -15° to +110°C
• with VITON seals: -15° to +90°C
• with NBR seals: -15° to +80°C
3 . INSTALLATION AND PREPARATION
3 .1 Conditions of use
The horizontal electric pumps are multistage pumps
operating with clockwise rotation looking at the electric
pump from the motor fan.
• Pump not self-priming.
• Maximum density of the pumped liquid: 1.1 kg / dm³.
• Allowed voltage variation: ± 5% (single-phase voltage
220÷240V 50Hz, three-phase 380÷415V / 220÷240V
50Hz).
• Degree of protection: IP55.
• Sound pressure level lower than 70 dB (A).
• Dimensions and overall dimensions (See technical
catalog).
• Maximum ambient temperature: +40°C.
3 .2 Minimum suction pressure
Check the characteristic curves of electric pumps to
evaluate the NPSH factor and avoid cavitation problems
(case in figure 1.B on page 4).
3 .3 Maximum suction pressure
It is important to maintain the sum of input and output
pressure; this latter, with closed opening, shall always
be lower than the allowed maximum operating pressure
for the electric pump. However, the maximum operating
pressure shall never exceed 10bar (case in Figure 1.A
on page 4).
3 .4 Minimum nominal flow rate
The operation of the electric pump at a lower level
of nominal minimum allowed flow rate may result in
excessive overheating, which may damage the electric
pump.
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The electric pump must never be operated with
the discharge valve closed.

4 . ELECTRICAL CONNECTIONS

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Before beginning to work on the electrical pump,
make sure that you have disconnected the
electricity from the power supply mains and that
it cannot be accidentally reconnected.
The installation of the electrical pump can involve a
certain amount of complexity. For this reason, it must be
performed by competent and authorized installers.
Legend figure 1 (see also p. 4):
1. Filter (maximum passage section of 1 mm)
12
2. Valve-filter (maximum passage section of 1 mm)
3. Gate valve
4. Manometer
5. Check Valve
6. Positive slope
7. Pipe anchoring elements
8. Storage container
There may be two important application cases:
• Case outlined in figure 1.A (see p. 4). System with pump
under head (positive head), be it a tank as shown in the
figure or the civil water supply network, the system must
provide protection in case of lack of water.
• Case outlined in figure 1.B (see p. 4): Plant with suction
pump.
4 .1 Mounting
Install the pump in an accessible place, protected against
frost and as close as possible to the water collection
point.
The electric pump must be firmly attached to the base by
means of bolts.
Allow enough space around the electric pump to allow
use and maintenance operations, as well as any possible
collection of hazardous liquids or liquids that need to be
drained at a temperature above 60 °C. In any case, make
sure that there is a clearance of at least 100 mm from the
cooling fan.
To avoid unnecessary stress to the pump body install
support brackets (see Figure 1, note 7 on page 4) to
support the inlet and outlet pipe.
To avoid air pockets harmful to the electric pump
operation, provide for an inclination of the inlet pipes of at
least 2% (see Figure 1, note 6 on page 4.)
Protect the pump from any water hammer through a check
valve placed in the delivery pipe. Install a shutoff valve
upstream and downstream of the pump so as to allow its
isolation in case of maintenance and disassembly.
The diameter of inlet pipes should never be less than the
diameter of the inlet opening.
For the diameter of the connection piping refer to the
following table:
Pump type
3
5
9
4 .2 Electrical connections
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Before beginning to work on the electrical pump,
make sure that you have disconnected the
electricity from the power supply mains and that
it cannot be accidentally reconnected.
Connections must only be performed by an authorized
electrician in compliance with law in force.
Verify that the data on the name plate match the nominal
values for the power line. Make the connection after
verifying the existence of a working grounding circuit.
DN threaded sleeves
Suction Delivery
1" ¼ 1"
1" ¼ 1"
1" ½ 1" ¼