E-Tech EV 1 Betriebs- Und Installationshandbuch Seite 39

Operating and installation manual
• If the pump is used to pump liquids with viscosity or density greater than water (a
motor with a proportionately higher power should be used).
• The water to be pumped has been chemically treated (softened, chlorinated,
demineralised etc.),
• In any other situation other than those listed under permitted use.
4.2 Technical data
4.2.1 Liquid temperature
Pumped liquids must remain within certain temperature limits
• with EPDM seals (standard versions): from -30°C to +120°C
• with VITON/FKM seals (special versions): from -10°C to +120°C
4.2.2 Ambient temperature and altitude
In the case of ambient temperatures higher than +40°C, or the installation of the pump
at an altitude higher than 1,000 metres, the motor must not work at full capacity to
avoid the risk of overheating. Excessive ambient temperatures and low air density
reduce the motor's ability to cool down. In these cases, it may be necessary to use
a motor with a higher rated power. Below is a non-binding chart of motor capacity
percentage based on altitude or temperature (see Fig. 6/A).
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
Under the data plate, a label indicates the rotation direction of the pump shaft and
the maximum operating temperature of the fluid, for uses other than those set out by
standard EN60335-2-41 (fig.16). For versions EV 1/3/6/10/15/20, a label positioned
on the lower part of the jacket shows the direction of flow (fig.16-A). For versions
EV 30/45/65/95 the indication of the direction of flow is shown on the pump base
(fig.16-B).
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
bp: 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.
Start-ups per hour
4 poles
250
140
60
30
15
8
The data plate, positioned on the upper part
of the pump's outer jacket (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).
Example
bp = 1 bar
Type of pump: EV 10
Capacity: 9 m3/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.
5.2 Checking maximum pressure
Working pressure
It is important to keep the sum of the inlet pressure plus the maximum pressure of the
pump at flow Q=0, always lower than the maximum allowed working pressure (PN).
The PN value is indicated on the nameplate of the pump.
Case 1:
Single standard pump fig.5.A
P1max + P2max <= PN
Case 2:
Standard pump + high pressure pump fig.5.B
P1max + P2max + P3max <= PNHP
In this case, refer to the maximum pump pressure HP clearly shown on the additional
label.
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
ENGLISH
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