Operating And Installation Manual - Franklin Electric VR Series Operating And Installation

Operating and installation manual

4.2.3 Maximum number of motor start-ups
The table shows the maximum number of start-ups per hour for the electric pumps supplied with a
standard motor.
Power (kW)
2 poles
0,37-0,55 100
0,75-3 60
4-7,5 30
11-22 15
30-55 8
55-200 4
With a motor other than the one supplied as a standard, check the manual for the maximum number
of start-ups per hour.
4.3 Pump data plate
4.4 Motor data plate
See plate attached to the motor.
4.5 Other plates
Pump rotation direction:
• versions VR 1/3/6/10 label on pump jackets (fig. 16-A)
• versions VR 15/20/30/45/65/95 arrows on metal components (fig. 16-B).
Flow direction:
• versions VR 1/3/6/10/15/20 labels on jackets (fig. 16-A).
• versions VR 30/45/65/95 arrows on metal components (fig. 16-B).
A label on the pump as shown in fig. 16 indicates:
the pump can handle liquid at 120°C for industrial use only (uses other than those covered
by standard CEI EN 60335-2-41);
the pump is suitable for handling liquid at 90°C for domestic use (uses covered by CEI EN
standard 60335-2-41);
Tmax 90°C
read the instruction manual carefully before use.
High pressure pump: a label indicates that the pump can work at a maximum pressure of 50 bar
(fig. 16).
5 INSTALLATION AND PREPARATION
For the pump to function correctly and to avoid damage to people or things, some fundamental
conditions must be observed, particularly the check of the NPSH and maximum pressure.
5.1 Checking the NPSH
Check the characteristic curves of the electric pump to evaluate the NPSH factor (see Fig. 3) and avoid
cavitation problems in the case of an excessively high gap between the pump and the level of the
liquid to be drawn or due to an excessively high temperature (fig.4.B).
The maximum height between the pump and the level of liquid "H" can be calculated using the
following formula:
H = pb x 10.2 – NPSH - Hf - Hv – Hs
pb: Bar pressure or liquid suction pressure [bar].
NPSH: Net positive suction head [m] (see fig.3)
Hf: Friction and entrance head losses in the suction piping [m]
Hv: Steam pressure [m] in relation to the temperature of the liquid (tm) (see fig.4.A)
Hs: Safety margin [m] (minimum 0.5)
If the value calculated is less than "0" the pump should be placed below the liquid level.
Example
bp = 1 bar
Type of pump: 10VR
Capacity: 9 m 3 /h
NPSH: 1.5 m
Hf = 2.5 m
Liquid temperature: +50°C
Hv: 1.3 m
H = bp x 10.2 - NPSH - Hf - Hv - Hs [m].
H = 1 x 10.2 – 1.5 – 2.5 – 1.3 – 0.5 = 4.4 [m]
This means that the maximum height between the pump and the level of the liquid to be sucked is
4.4 metres.
Start-ups per hour
4 poles
250
140
60
30
15
8
The data plate of the pump (fig.16), displays the
following information:
A) Pump identification code,
B) Serial number,
C) Year of manufacture,
D) Working capacity range,
E) Head range,
F) Minimum head (IEC EN 60335-2-41),
G) Head at 0 capacity,
H) Maximum absorbed power,
I) Rotation speed at maximum power,
L) Minimum efficiency index,
M) Maximum pump efficiency,
N) Maximum operating pressure (PN),
O) Maximum temperature of pumped liquid
(for uses other than those set out by IEC
EN 60335-2-41),
P) Weight of pump/electropump,
X) Product code.
5.2 Verifying maximum pressure
Working pressure
It is important that inlet pressure of the pump plus maximum zero-flow pressure in the pump do not
exceed maximum working pressure Pmax shown on the data plate.
Example 1:
Single standard pump fig.5.A
P1max + P2max <= Pmax
Example 2:
Standard pump + high pressure pump fig.5.B
P1max + P2max + P3max <= Pmax
Inlet pressure
The inlet pressure must not exceed the limits indicated in the tables in (fig. 2, H1).
5.3 Minimum rated capacity
The function of the pump at a lower level than the minimum nameplate allowed rated capacity, may
cause excessive and detrimental overheating of the pump.
For water temperatures over 40°C, the minimum capacity should be increased according to the
temperature of the liquid (see fig.6).
Please contact our sales and service department for liquids other than water.
WARNING: The pump should never operate dry (without liquid inside)
WARNING: The pump must never operate with the delivery valve closed for more than 10
seconds.
5.4 Installation of the pump
WARNING: Please observe current accident prevention standards; use proper protective
devices and refer to the regulations, legislation and local and/or national country codes for
water and electricity connections.
WARNING: Before starting work on the electric pump, make sure the electrical connection
has been disconnected from the power supply network and that it cannot be reconnected
accidentally.
WARNING: Ensure all electrical equipment of the pump, motor and monitoring equipment is
earthed. The earth connection should be the last connection to disconnect from the terminal.
Make sure that the earth connection is longer than the phase connections on both ends of the
cable. As extra protection from lethal electric shocks, install a high sensitivity residual current
device (30mA).
WARNING: DO NOT USE THIS PUMP IN ENVIRONMENTS THAT MAY CONTAIN
INFLAMMABLE/EXPLOSIVE OR CHEMICALLY AGGRESSIVE DUST OR GAS.
WARNING: The installation of the electric pump is an operation that may prove complex. It
should therefore be carried out by skilled and authorised installers.
5.4.1 Assembly
Guide lines
• Install the electric pump in an accessible area, protected from frost and leaving sufficient space
around the electric pump to allow for its operation and maintenance.
• Horizontal assembly is permitted only if the electric pump is properly supported. Vertical assembly is
not permitted with the motor placed on the lower part (see fig.7).
• Check that there are no obstacles blocking the air flow to cool the motor, make sure there is at least
100 mm of space in front of the fan (Fig.9).
• Any liquid leakages or similar events must be drained and should not flood the place of installation
and/or submerge the unit.
• The electric pump must ALWAYS be firmly fixed to a concrete base or to a metal structure of size
and weight to suit the size and weight of the electric pump; use screws suitable for the fixing holes
provided (see fig.8 dimensions, tightening torques). To reduce vibrations to a minimum, insert
vibration-damping seals between the pumps and the base.
• Make sure the pump is correctly orientated: The flow arrows shown on the pump should point in
the direction of flow of the connection pipes.
• The connection pipes must be suitable for the operating pressure and the pumped liquid; between
the pipe connections and the pump proper seals should be inserted.
• The pipes should be properly supported (fig.9-1), without resting on the unit. Do not force the
position of the pipes by fixing them, using bolts, to the pump (see fig. 13 for maximum forces and
stresses applicable to connections). Flexible hoses or expansion joints (fig.9-2) are necessary to
avoid vibrations being transmitted from the pump to the piping and vice-versa.
• To prevent air bubbles in the suction pipe, arrange it at an inclination of no less than 2%. The
diameter of the pipe should not be smaller than the diameter of the suction vent and should be
sealed. If the suction pipe is bigger, install an eccentric reducer (fig.9-6). If the pump is above the
liquid to be sucked (negative suction head pump fig.9-A) a foot valve should be fitted to the end
of the suction pipe (fig.9-3).
• The end of the suction pipe should be sufficiently immersed to prevent air entering the suction
vortex (fig.9-7) when the liquid is at minimum level. Suitably sized gate valves should be fitted to
the suction pipes (fig.9-4) and delivery pipes (fig.9-8) to regulate flow and to isolate the pump
from the circuit in the case of inspection and maintenance.
• Install a check valve (fig.9-5) to the delivery piping to prevent reflux and water hammers when
the pump is switched off.
• See fig.10: pump connections size and bolt tightening torques.
High pressure pump
• The high pressure pump must be used with a standard pump and connected as shown in fig.5. The high
pressure pump must ALWAYS be in second position.
WARNING: Incorrect connection of the high pressure pump may cause injury to persons and
material damage.
WARNING: Depending on the temperature of the pumped liquid, the surfaces of the electric
pump may reach high temperatures. If deemed necessary, provide guards to avoid accidental
contact.
5.4.2 Electrical connections
WARNING: Low voltage machines are comprised of rotating, hazardous, live parts and
sometimes also hot surfaces.
ENGLISH
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