Limits Of Use; Hydraulic Installation - Pentair NOCCHI FREQUENCY CHANGER Instrucciones Originales

GB
CHAPTER 2

LIMITS OF USE

Our pressurization groups are constructed for the raising clean water without solid suspended particles or abrasive materials.
WARNING
The group is not suitable for pumping chemically aggressive or inflammable liquids.
WARNING
Avoid any dry-operating of the motor pump.
• MAXIMUM TEMPERATURE OF THE
LIQUID PUMPED: 40 °C
CHAPTER 3

HYDRAULIC INSTALLATION

Fig.2 shows the assembly diagrams normally used.
DANGER - ELECTRIC SHOCK RISK
All the assembly operations must be carried out with group disconnected from the power grid.
In the case where the pressurization group is fed by a tank, avoid any unpriming phenomena; we recommend to control the
following characteristic data:
• STATIC LEVEL (initial level of the well)
• DYNAMIC LEVEL (level reached during the group operation)
• FLOW RATE
• To reduce losses during
replenishment it is necessary to
install the group as close as possible
to the pumping point and to install
a suction pipe with a minor number
of curvatures that should have a
sufficiently wide radius
• Even the diameter of the pipe should
be calculated so as to reduce load
losses, what requires dimensions
greater than or equal to those of the
motor pump aspiration inlet
WARNING
It is a good rule to foresee the evacuation of water losses in case of bad seal of joints, mechanical seal, tanks
overflowing.
In the case where there would not be any pumping in close proximity from the group, on the discharge line, the installation of a test
faucet is recommended.
It is necessary to control from time to time the pre-replenishment pressure of membrane vessel that must be 0.2 bar lower than
the minimum closing pressure of the pressure switch calibrated lower.
This control must be done without pressure in the installation or with the tanks disassembled.
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• MAXIMUM/MINIMUM AMBIENT
TEMPERATURE: 40 °C
• In order to avoid the formation of
air locks into the suction pipes,
these ones must have a positive
gradient, from bottom to top, avoiding
countergradients or "goosenecks",
and there must not any infiltration in
the connections
• Connect the delivery collector to the
distribution collector by interposing
vibration-damping joint
• This connection can be done either
on the right side or on the left side of
the collector by displacing the blind
flange or the threaded cover