Xylem e-SV - Manual (Page 16)

4.1 Earthing grounding
WARNING:
• Always connect the external protection conductor to earth
(ground) terminal before making other electrical connections.
• You must earth (ground) all electrical equipment. This applies
to the pump equipment, the driver, and any monitoring
equipment. Test the earth (ground) lead to verify that it is
connected correctly.
• If the motor cable is jerked loose by mistake, the earth
(ground) conductor should be the last conductor to come
loose from its terminal. Make sure that the earth (ground)
conductor is longer than the phase conductors. This applies
to both ends of the motor cable.
• Add additional protection against lethal shock. Install a high-
sensitivity differential switch (30 mA) [residual current device
RCD].
4.2 Facility requirements
4.2.1 Pump location
DANGER:
Do not use this pump in environments that may contain flam-
mable/explosive or chemically aggressive gasses or powders.
Guidelines
Observe the following guidelines regarding the location of the product:
• Make sure that no obstructions hinder the normal flow of the cooling air
that is delivered by the motor fan.
• Make sure that the installation area is protected from any fluid leaks, or
flooding.
• If possible, place the pump slightly higher than the floor level.
• The ambient temperature must be between 0°C (+32°F) and +40°C
(+104°F).
• The relative humidity of the ambient air must be less than 50% at +40°C
(+104°F).
• Contact the Sales and Service Department if:
• The relative air humidity conditions exceed the guidelines.
• The room temperature exceeds +40°C (+104°F).
• The unit is located more than 1000 m (3000 ft) above the sea level.
The motor performance may need to be de-rated or replaced with a
more powerful motor.
For information about which value to de-rate the motor with, see Table 8.
Pump positions and clearance
NOTICE:
Horizontal mounting of the pump requires special adaptation.
Provide adequate light and clearance around the pump. Make sure that it is
easily accessible for installation and maintenance operations.
Installation above liquid source (suction lift)
The theoretical maximum suction height of any pump is 10.33m. In practice,
the following affect the suction capacity of the pump:
• Temperature of the liquid
• Elevation above the sea level (in an open system)
• System pressure (in a closed system)
• Resistance of the pipes
• Own intrinsic flow resistance of the pump
• Height differences
The following equation is used to calculate the maximum height above the
liquid level which the pump can be installed:
(p
b
*10.2 - Z) ≥ NPSH + H
f
+ H
v
+ 0.5
p
b
Barometric pressure in bar (in closed system is system pressure)
NPSH Value in meter of the pump intrinsic flow resistance
H
f
Total losses in meters caused by passage of liquid in the suction
pipe of the pump
H
v
Steam pressure in meters that correspond to the temperature of
the liquid T °C
0.5 Recommended safety margin (m)
Z Maximum height at which the pump can be installed (m)
For more information, see Figure 7.
(p
b
*10.2 - Z) must always be a positive number.
For more information about the performance, see Figure 5.
NOTICE:
Do not exceed the pumps suction capacity as this could cause cavitation and
damage the pump.
4.2.2 Piping requirements
Precautions
WARNING:
• Use pipes suited to the maximum working pressure of the
pump. Failure to do so can cause the system to rupture, with
the risk of injury.
• Make sure that all connections are performed by qualified in-
stallation technicians and in compliance with the regulations
in force.
NOTICE:
Observe all regulations issued by the municipal authorities if the pump is
connected to the municipal water system. If required by the authorities, in-
stall appropriate backflow-prevention device on the suction side.
Suction and discharge piping checklist
Check that the following requirements are met:
• All piping is independently supported, piping must not place a burden on
the unit.
• Flexible pipes or unions are used, in order to avoid transmission of pump
vibrations to the pipes and vice versa.
• Use wide bends, avoid using elbows which cause excessive flow resist-
ance.
• The suction piping is perfectly sealed and airtight.
• If the pump is used in an open circuit, then the diameter of the suction
pipe is suited to the installation conditions. The suction pipe must not be
smaller than the diameter of the suction port.
• If the suction piping must be larger than the suction side of the pump,
then an eccentric pipe reducer is installed.
• If the pump is placed above liquid level, a foot valve is installed at the end
of the suction piping.
• The foot valve is fully immersed into the liquid so that air cannot enter
through the suction vortex, when the liquid is at the minimum level and
the pump is installed above the liquid source.
• Appropriately sized on-off valves are installed on the suction piping and
on the delivery piping (downstream to the check valve) for regulation of
the pump capacity, for pump inspection, and for maintenance.
• In order to prevent back flow into the pump when pump is turned off a
check valve is installed on the delivery piping.
WARNING:
Do not use the on-off valve on the discharge side in the closed
position in order to throttle the pump for more than a few sec-
onds. If the pump must operate with the discharge side closed
for more than a few seconds, a bypass circuit must be installed to
prevent overheating of the water inside the pump.
For illustrations that show the piping requirements, see Figure 12.
4.3 Electrical requirements
• The local regulations in force overrule these specified requirements.
• In the case of fire fighting systems (hydrants and/or sprinklers), check
the local regulations in force.
Electrical connection checklist
Check that the following requirements are met:
• The electrical leads are protected from high temperature, vibrations, and
collisions.
• The power supply line is provided with:
• A short-circuit protection device
• A high-sensitivity differential switch (30 mA) [residual current device
RCD] to provide additional protection against electric shock
• A mains isolator switch with a contact gap of at least 3 mm
en - Translation of the original instructions
12 e-SV - English