Calpeda NR Instrucciones Originales De Uso página 6

(fig. 3)
4.93.032.2
If the pipe is not stable enough, the pump must
be fastened and supported by the suitable threa-
ded holes on the pump casing (fig. 3).
The NR, NR4 in-line pumps can be flanged in
the pipe at any angle.
For safety reasons avoid the position with the
motor under the pump.
For installation in a position other than with a ver-
tical rotor axis, care must be taken to see that a
drain and condensation water hole is
provided at the lowest point of the motor.
Provide enough clearance around the unit for
motor ventilation, for inspections, to check
the rotation of the shaft and for filling and draining
the pump.
4. Pipes
The pipe diameters must never be smalter than
the pump connections.
The suction pipe must be perfectly air tight
and be led upwards in order to avoid air pockets.
For suction lift operation fit a foot valve with strai-
ner which must always remain immersed.
For operation with a positive suction head fit a
check valve.
Provide gate valves on the suction and delivery
sides.
5. Electrical connection
Electrical connection must be carried
out by a qualified electrician in accor-
dance with local regulations.
Follow all safety standards.
The unit must be properly earthed
(grounded).
Connect the earthing (grounding) conductor to the
terminal with the marking.
Compare the mains voltage with the name-plate
data and connect the supply conductors to the
terminals in accordance with the appropriate dia-
gram inside the terminal box cover.
TTENTION: with motor power rating
kW avoid direct starting. Provide a control
panel with star-delta starting or an other
starting device.
Install a device for disconnection from
the mains, (switch) with a contact separation of
at least 3 mm in all poles.
Install an overload protection device appropriate
for the rated current of the pump.
6
6. Starting
Check that the shaft turns by hand.
For this purpose the smaller pumps have a
screwdriver notch on the ventilation side of the
shaft end.
Never run the pump dry.
Start the pump after filling it completely with liquid.
When operating under a positive suction head, fill
the pump by opening the suction gate valve
slowly and completely, keeping the delivery gate
valve and the vent holes (14.42) open to release
the air.
For water circulation in a closed circuit, open
both gate valves completely by releasing the air.
With three-phase motors check that the
direction of rotation is as shown by the ar-
row on the pump casing, otherwise disconnect
electrical power and reverse the connections of
two phases.
Check that
shown on the name-plate is not exceeded.
Otherwise adjust the delivery gate valve.
Care must be taken when the pum-
ped fluid has a high temperature.
Do not touch the fluid when its tem-
perature is higher than 60 °C. Do
not touch the pump or motor when
their surface temperature is higher
than 80 °C.
7. Maintenance
In the event of prolonged standstill periods or if
freezing may be expected drain the pump com-
pletely.
Before restarting the unit, check that the shaft is
not jammed and fill the pump casing completely
with liquid.
Disconnect
before any servicing operation.
8. Dismantling
Close the suction and delivery gate valves and
drain the pump casing before dismantling the
pump.
The motor and all internal parts can be dismantled
without removing the pump casing and the pipes.
By removing nuts (14.28) the motor is taken out
complete with impeller.
For dismantling and re-assembly see construc-
tion in the cross section drawing.
5.5
9. Spare parts
When ordering spare parts, please quote the data
stamped on the name-plate (typ, date and serial
number), the part designation and the position
number of each spare part required (in accordan-
ce with the cross section).
Changes reserved.
the absorbed
electrical
current
power