Starting Up The Product; Priming; Pre-Start Checklist; Motor Direction Of Rotation - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

5. Starting up the product

5.1 Priming

• End suction pumps are non-self-priming, and must be
completely primed, i.e. filled with liquid, before starting.
• If the pump will be operated with a positive inlet pressure,
prime it by opening the inlet valve and allowing liquid to enter
the pump housing. Open the air vents at this time, and make
sure all air is forced out of pump by the liquid before closing
the air vents.
• Rotate the shaft by hand to free entrapped air from the
impeller passageways.
• If the pump will be operating with a suction lift, priming must
be accomplished by other methods. Use foot valves or
ejectors, or fill the pump housing and the inlet line manually
with liquid.
Never run the pump dry in the hope that it will prime
itself. The result will be serious damage to the shaft
seals, pump wear rings and shaft sleeves.

5.2 Pre-start checklist

WARNING
Product failure
Death or serious personal injury
- Do not operate the product above the nameplate
conditions.
Make the following inspections before starting your end suction
pump:
1. Make sure the inlet and outlet pipes have been cleaned and
flushed to remove dirt and debris.
2. Double check the direction of rotation is clockwise. Operating
in reverse will destroy the impeller and shaft.
3. Make sure all wiring connections to the motor and starting
device are in accordance with the wiring diagram.
4. If the motor has been in storage for a long time, either before
or after installation, refer to the motor instructions before
starting.
5. Check the voltage, phases, and frequency with the motor
nameplate. Turn the impeller by hand to make sure it rotates
freely.
6. Tighten the plugs in the gauge and drain holes. If the pump is
fitted with pressure gauges, keep the gauge cocks closed
when they are not in use.
7. Check the inlet and outlet pipes for leaks, and make sure all
flange bolts are securely tightened.
10
All manuals and user guides at all-guides.com

5.3 Motor direction of rotation

5.4 Starting the pump

1. Install the factory-provided coupling guard on coupled
2. Fully open the gate valve (if any) in the inlet line, and close
3. Fill the inlet line with liquid and completely prime the pump.
4. Start the pump.
5. Immediately make a visual check of the pump and inlet pipe
6. Immediately after the pump has reached full operating speed,
7. Check the outlet pipe for pressure leaks.
8. If the pump is fitted with pressure gauges, open gauge cocks
9. Check and record voltage, amperage per phase, and

5.5 Voltage and frequency variation

The motor will operate satisfactorily under the following voltage
and frequency variations, but not necessarily in accordance with
the standards established for operation under rated conditions:
•
•
•

6. Storing and handling the product

See sections
shutdown
Never check the motor direction of rotation unless
the pump and motor couplings have been
disconnected and physically separated. Failure to
follow this instruction can result in serious damage
to the pump and the motor if the direction of rotation
is wrong.
DANGER
Moving machine parts
Death or serious personal injury
- Mount an approved coupling guard before
operating the product.
products.
the gate valve in the outlet line.
for pressure leaks.
slowly open the outlet gate valve until complete system flow is
achieved.
and record pressure readings for future reference. Verify that
the pump is performing in accordance with the parameters
specified in the performance curves.
kilowatts, if a wattmeter is available.
The voltage variation may not exceed 10 % above or below
the rating specified on the motor nameplate.
The frequency variation may not exceed 5 % above or below
the motor rating.
The sum of the voltage and frequency variations may not
exceed 10 % above or below the motor rating, provided the
frequency variation does not exceed 5 %.
3.3 Temporary storage after
and
9.3 Long-term shutdown.
delivery, 9.2 Short-term