Operating And Installation Manual - E-Tech EH 3 Manual De Uso

Operating and installation manual

4.2.3 Maximum number of start-ups
Power
[kW]
2 poles
0,37 ÷ 0,55 60
0,75 ÷ 3
60
4 ÷ 7,5
30
The table shows the maximum number of start-ups per hour for the electric pump.
4.2.4 Maximum limit of pressure
The maximum pressure, not to be exceeded, is shown on the data plate (see point 4.3).
4.3 Pump data plate
The data plate, positioned on the side of the pump's outer casing, contains the main information about
the machine (EH: fig. 5; EHsp: fig. 11).
Single-phase:
A) Pump identification code
B) Serial number
C) Date of production
D) Product code
E) Working flow range
F) Working head range
G) Minimum head (according to EN 60335-2-41)
H) Maximum head
I) Maximum ambient temperature
L) Motor type and frequency
M) Maximum absorbed power
N) Electrical Connections / Motor data
O) Capacitor (single-phase motors)
P) Weight of electric pump
Q) Motor insulation class
R) Motor IP rating
S) Max. working pressure / Max. temperature
T) Efficiency at variable loads
4.4 Other plates
For three-phase motors only, a label with arrow on the cover of the motor's cooling fan indicates the
correct direction of rotation (EH: fig. 5-F; EHsp: fig. 11-F).
A label on the pump as shown in Fig. 5-U (EH) and Fig. 11-U (EHsp) indicates:
the pump is suitable for pumping liquid at the indicated temperatures for industrial use only
(uses other than those provided by the CEI EN 60335-2-41 standard);
the pump is suitable for pumping liquid at the indicated temperatures for home use (uses
provided by the CEI EN 60335-2-41 standard);
read the instruction manual carefully before use.
A WRAS label on the pump indicates that the product can be used for handling
drinking water for human use.
5 INSTALLATION AND PREPARATION
For the pump to function correctly and to avoid damage to people or things, some basic conditions
must be observed.
In particular the NPSH and maximum pressure must be checked.
5.1 Checking the NPSH
Check the characteristic curves of the electric pump to evaluate the NPSH factor (EH: Fig. 8; EHsp:fig.
13) and thus 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. 2).
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] (EH: Fig. 8; EHsp: fig. 13)
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. 2-A)
Starts for hour
4 poles
140
140
60
Three-phase:
LOGO
A
Model
B C
S/N° Date
D
Code
E F
Q
l/min H m
G H
Hmin m Hmax m
MEI Hyd. E .
I
Continuous Duty T
amb
L M
Motor Hz P kW
1
N N N N
V A V A
Y Y
T T T
IE3 2/4 % 3/4 % 4/4
P Q
Peso Kg CI IP
S
Pmax/Tmax bar/°C
Made in Italy
Hs: afety margin [m] (minimum 0.5)
If the value calculated is less than "0" the pump should be placed below the liquid level.
Example
pb = 1 bar
Type of pump: EH 15/4
Capacity: 14 m /h
3
NPSH: 1,8 m
Hf = 2,5 m
Temperature of the liquid: +50°C
Hv: 1,3 m
H = pb x 10,2 - NPSH - Hf - Hv - Hs [m].
H = 1 x 10,2 - 1,8 - 2,5 - 1,3 - 0,5 = 4,1 [m]
This means that the maximum height between the pump and the level of the liquid is 4.1 metres.
5.2 Verifying maximum pressure
Working pressure
It is important to keep the sum of the inlet pressure plus the maximum pressure of the pump at zero
capacity, always lower than the maximum allowed working pressure (PN). The PN maximum working
pressure is shown on the data plate (see point 4.3).
5.3 Minimum rated capacity
WARNING: The pump must never operate dry (without liquid inside it)
WARNING: The pump must never operate with the discharge valve closed for more than 5
seconds.
%
Functioning for a long time at a lower level than the minimum allowed on the data plate may cause
°C
excessive and dangerous 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. 3). For liquids other than water contact the sales and service office.
%
5.4 Installing the pump
R
WARNING: Please observe current accident prevention standards, use suitable protective
devices and refer to the regulations, legislation and local and/or national laws in the country
of installation regarding water and electricity connection.
WARNING: DO NOT USE THIS PUMP IN ENVIRONMENTS THAT MAY CONTAIN
INFLAMMABLE/EXPLOSIVE OR CHEMICALLY AGGRESSIVE POWDERS OR GASES.
WARNING: Installing an electric pump may be a rather complex operation. It should
therefore be carried out by skilled and authorised installers.
5.4.1 Assembly
Guidelines
• Install the electric pump in an area that is accessible and protected from frost, leaving sufficient
space around the electric pump to allow for its operation and maintenance.
• Vertical assembly is not permitted with the motor placed on the lower part (EH: Fig.5-V; EHsp:
fig. 11-V).
• Check that there are no obstacles blocking the air flow to cool the motor, make sure there is at
least 100mm of space in front of the fan (EH: Fig. 5; EHsp: fig. 10).
• Any liquid leakages or similar occurrences must be drained and must 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 a size
and weight to suit the size and weight of the electric pump, using screws suitable for the fixing
holes provided (EH: Fig. 6,7; EHsp: 12 - dimensions, tightening torques).
• If the pump works with liquid at temperatures above 50 ° C, anchor the pump only on the side of
the motor bracket and leave free the inlet side bracket.
• To reduce vibrations to a minimum, insert vibration-damping seals between the pump and the
base.
• Make sure the pump is correctly orientated (EH: Fig. 5; EHsp: fig. 11).
• The connection pipes must be suitable for the operating pressure and the pumped liquid.
Between the connections of the pipes and the pump must be interposed appropriate sealing
gaskets.
• The pipes should be properly supported (EH: Fig. 5-1; EHsp: fig. 11-1) and should not rest on the
unit. Do not force the position of the pipes when fixing them to the pump. Flexible pipes or
expansion joints (EH: Fig. 5-2; EHsp: fig. 11-2) are necessary to avoid vibrations being transmitted
from the pump to the pipes and vice versa.
• To prevent air bubbles in the suction pipe, give it an inclination of no less than 2%.
• The diameter of the pipe should not be smaller than the diameter of the suction vent and must be
hermetically sealed. If the suction pipe is bigger, install an eccentric reducer (EH: Fig. 5-6; EHsp:
fig. 11-6).
• If the pump is installed above the level of the liquid to be suctioned (suction head case), a check
valve will have to be fitted to the pipe (EH: see fig. 5-3; EHsp: see fig. 11-3).
• The end of the suction pipe should be sufficiently immersed to prevent air entering the suction
vortex (EH: Fig. 5-7; EHsp: fig. 11-7) when the liquid is at minimum level.
• Suitably sized gate valves should be fitted to the suction pipes (EH: Fig. 5-4; Ehsp: fig. 11-4) and
delivery pipes (Fig. 5-8) to isolate the pump from the circuit in the case of inspection and
maintenance.
• Install a check valve (EH: Fig. 5-5; EHsp: fig. 11-5) to the discharge piping to prevent reflux
and water hammer when the pump is switched off.
• See (EH: Fig. 6, 7; EHsp: fig. 12) for the sizes of the pump's threaded connections.
WARNING: Depending on the temperature of the pumped liquid, the surfaces of the electric
pump can become very hot. If deemed necessary, provide guards to avoid accidental
contact.
5.4.2 Electrical connections
WARNING: Low voltage machines are made up of rotating, hazardous, live parts and also
sometimes of hot surfaces.
ENGLISH
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