Pentair Pool Products Nocchi R2T, Use And Maintenance Manual

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PIPE ASSEMBLY
Incorrect
Correct
Accumulated
air
Warning The pump should never be started if the
check valve on the delivery side is closed,
because this would increase the
temperature of the fluid inside the pump.
The accumulation of steam could cause
cavitation, which could damage the moving
components.
If the valve can operate with a closed valve,
it is advisable to ensure a minimum fluid
flow by means of a by-pass or a drain. The
drain can also be connected to a collection
reservoir every time it is necessary to
provide a minimum flow equivalent to at
least 10% of the rated one in the maximum
yield point. Flow rate and head in the
maximum yield point are printed on the
pump nameplate.
3.6.3 Air vent
Considering that the mechanical seal is water lubricated, the
machine should be operated only after the machine and the
system have been filled with water and vented from air. The air
is vented from the pump through a special vent valve.
VENT VALVE
This operation doesn’t need to be performed on machines
installed on vertical pipes with flow directed upwards.
For twin machines with horizontal or vertical shaft, this
operation should be performed by loosening the 1/8” cap on
the pump housing.
Sometimes the air venting operation needs to be repeated
several times to completely remove the noise originating from
the presence of air in the pump.
3.6.4 Terminal block positioning
Warning Before performing any operation, make
sure that the pump is not connected to the
power supply and that it cannot be started
accidentally.
The terminal block can be rotated in any position by 90° steps.
To change the position of the terminal block, perform the
operations described here below:
1. If necessary, use a screwdriver to remove the grid that
protects the motor-pump coupling. Do not remove the
coupling.
2. Remove the screws that fix the motor to the pump body.
3. Turn the motor in the desired position.
4. Reposition and tighten the screws.
5. Reassemble the protection grid.
3.6.5 Connection to the mains
Danger The installer will have to make sure that the
electric supply system has an adequate
grounding compliant with the laws in force.
Danger Check that the supply system has a
differential switch with a degree of
sensitivity of
∆
= 30 mA (DIN VDE
0100T739).
Danger Before removing the cover from the
terminal block of the motor and before
performing operations on the machine,
make sure that the supply line has been
cut-off.
NOTE
The electric motors of twin machines are
connected separately.