NOCCHI SENSORMAT Manual De Uso página 20

GB
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.
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.
WARNING
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
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.
Chap.4 – Priming of the group
See fig. 1 - 2
DANGER
Risk of electrical
discharge
WARNING
In case of aspiration with
as follows:
- open all valves and remove the priming plugs on the aspiration collector and on the motor pumps
- open the water supply on-off valve until the evacuation of the liquid
- close again the feed faucet and the pumping plugs
In the case where the group supply
- open all valves and to and remove the priming plugs on the aspiration collector and on the pumps
- fill with water through the suction pipe
- make the necessary topping-up through the priming plugs on the pump casing until complete filling-up
- re assemble the plugs
Chap.5 – Electric connection
See fig.3-4-5 and other schemes reported on the switchboard
WARNING
DANGER
Risk of electrical
discharge
WARNING
18
It is a good rule to foresee the evacuation of water losses in case of
bad seal of joints, mechanical seal, tanks overflowing.
Always shut off the voltage before proceeding to any operation.
the group needs to be filled up before putting it in operation. The dry-
operation of the motor pump damages the hydraulic parts.
positiv suction head, open storage, aqueduct or water pipe under pressure, prime the group
is with lower suction head,
Check that the voltage and frequency indicated on the data plate
correspond to those of the available power grid.
Check that the power supply is provided with an efficient ground
installation which conforms with the regulations in force.
The power supply is equipped with differential circuit breaker with the
sensitivity required by the regulations in force for this type of
equipment.
of membrane vessel
underground well or tank, prime the group as follows:
that must be 0.2