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4 Installation
Precautions
WARNING:
• Observe accident prevention regulations in force.
• Use suitable equipment and protection.
• Always refer to the local and/or national regulations,
legislation, and codes in force regarding the selection of
the installation site, plumbing, and power connections.
Electrical Hazard:
• Make sure that all connections are performed by quali-
fied installation technicians and in compliance with the
regulations in force.
• Before starting work on the unit, make sure that the unit
and the control panel are isolated from the power sup-
ply and cannot be energized. This applies to the control
circuit as well.
Grounding (earthing)
Electrical Hazard:
• Always connect the external protection conductor to
ground (earth) terminal before making other electrical
connections.
• You must ground (earth) all electrical equipment. This
applies to the pump equipment, the driver, and any
monitoring equipment. Test the ground (earth) lead to
verify that it is connected correctly.
• If the motor cable is jerked loose by mistake, the
ground (earth) conductor should be the last conductor
to come loose from its terminal. Make sure that the
ground (earth) conductor is longer than the phase con-
ductors. This applies to both ends of the motor cable.
• Add additional protection against lethal shock. Install a
high-sensitivity differential switch (30 mA) [residual cur-
rent device RCD].
4.1 Facility requirements
4.1.1 Pump location
DANGER:
Do not use this unit in environments that may contain flam-
mable/explosive or chemically aggressive gases or powders.
Guidelines
Observe the following guidelines regarding the location of the product:
• Make sure that no obstructions hinder the normal flow of the cool-
ing 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
12
.
Pump positions and clearance
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
e-nscs Installation, Operation, and Maintenance Manual
The following equation is used to calculate the maximum height above
the liquid level which the pump can be installed:
(p
*10.2 - Z) ≥ NPSH + H
b
p
Barometric pressure in bar (in closed system is system pres-
b
sure)
NPSH Value in meter of the pump intrinsic flow resistance
H
Total losses in meters caused by passage of liquid in the suc-
f
tion pipe of the pump
H
Steam pressure in meters that correspond to the temperature
v
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
(p
*10.2 - Z) must always be a positive number.
b
NOTICE:
Do not exceed the pumps suction capacity as this could cause cavita-
tion and damage the pump.
4.1.2 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 quali-
fied installation technicians and in compliance with the
regulations in force.
NOTICE:
Observe all regulations issued by authorities having jurisdiction and by
companies managing the public water supplies if the pump is connect-
ed to a public water system. If required, install appropriate backflow-
prevention device on the suction side.
Piping checklist
Check that the following requirements are met:
• All piping is independently supported, piping must not place a bur-
den 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
resistance.
• 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 mini-
mum level and the pump is installed above the liquid source.
• Appropriately sized on-off valves are installed on the suction pip-
ing and on the delivery piping (downstream to the check valve) for
regulation of the pump capacity, for pump inspection, and for
maintenance.
• Appropriately sized on-off valve is installed on the delivery piping
(downstream to the check valve) for regulation of the pump ca-
pacity, for pump inspection, and for maintenance.
Table
• 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 seconds. 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 liquid inside
the pump.
For illustrations that show the piping requirements, see
Figure 15
.
en - Translation of the original instructions
+ H
+ 0.5
f
v
Figure 13
.
Figure 14
and
15
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