Starting Up The Product; Priming; Pre-Start Checklist; Motor Direction Of Rotation - Grundfos KP Notice D'installation Et De Fonctionnement

5. Starting up the product

5.1 Priming

KP, KPV, KPVS pumps are non-self-priming and must be
completely primed, that is filled with liquid, before starting.
• If the pump will be operating with a positive inlet pressure,
prime it by opening the inlet valve and allowing liquid to enter
the pump housing. Open the vents at the top of the upper
pump housing and the top of each inlet dome, and make sure
that all air is forced out of the pump by the liquid before closing
the vents.
• IMPORTANT: Rotate the shaft by hand while priming and
venting 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, ejectors
or vacuum pumps, or fill the pump housing and 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

Do not operate the product above the range of the
nameplate conditions. This may damage the product.
Make the following inspections before starting your KP, KPV,
KPVS pump.
1. Make sure that the inlet and outlet pipes have been cleaned
and flushed to remove dirt and debris.
2. Make sure that all wiring connections to the motor and starting
device are in accordance with the wiring diagram and produce
proper rotation.
3. If the motor has been in storage for a long time, either before
or after installation, refer to the motor instructions before
starting.
4. Check the voltage, phase, and frequency with the motor
nameplate.
5. Turn the impeller by hand to make sure that it rotates freely.
6. Tighten the plugs in the gauge and drain the holes. If the
pump is fitted with pressure gauges, keep the gauge cocks
closed when they are not in use.
7. Recheck the motor-to-pump alignment per section
4.8 Coupling alignment (KP).
8. Check inlet and outlet pipes for leaks, and make sure that all
flange bolts are securely tightened.
9. If the pump will run on a variable frequency drive, do not ramp
up the pump from reduced speeds. Go directly on-line at full
speed, especially at commissioning so adequate pressure is
generated to flush wear rings and create a hydrostatic bearing
effect.
12

5.3 Motor direction of rotation

Never check the motor direction of rotation unless
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.
After the unit has been wired and checked to ensure that all
components in the system, such as disconnect devices, magnetic
starters, pilot devices and motors, are properly connected, check
the motor direction of rotation as follows:
• Make sure that the coupling is disconnected, then momentarily
energize the motors to ensure that the direction of rotation is
correct as indicated by the arrow cast into the pump housing.
If the direction of rotation is incorrect, interchange the two
wires at the motor-protective circuit breaker terminals T1 and
T2.
• For Wye-Delta motors the direction of rotation has to be
verified for both wye and delta connections.
• For proper direction of rotation, reference rotation drawing in
section
4.8 Coupling alignment
The pumps must not be operated while dry. Use
extreme caution that motors are energized only
momentarily to determine proper direction of rotation.
(KP).