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5
PRIMING
A pumping system must never be started dry for any reason. Dry running of the
pumps, even for very brief periods, can cause irreversible damage to mechanical
sealing and internal rotating couplings. All pumps must be primed before starting
the system by unscrewing the filler cap and filling the pump body with water (and
the intake piping connected to it). When the operation has been completed,
tighten the cap and start the pump, with the cut-off valve in flow almost
completely closed, with the system in manual functioning mode (TEST).
If, after a few tens of seconds, the pump is not primed, switch it off, check that the
intake is free, that there are no air pockets upstream from the inlet, that the body
is full of water and then repeat the operation. In the units, priming is performed for
each individual pump, turning off the other pumps and performing the operations
described above for each pump. To make priming of each pump simpler, E-SERIES
suspends the SLAVE operation if the MASTER is off (that is, the inverter returns to
being completely independent) so that each inverter can be manoeuvred
independently during the priming or test phase. Once all of the pumps are primed,
the operative parameters can be set on the MASTER inverter. These are
automatically sent to the SLAVE inverters when they are turned on.
5.1
Pressure Vessel
A minimium of one 24 ltr Pressure Wave vessel is normally fitted during
production. A vessel should always be fitted on the discharge manifold close to
the transducer to stabilize the pressure signal. Unlike conventional fixed speed
systems a large vessel reservoir is not required. The vessel air charge should be
maintained at 0.5 bar below the systems nominal operating pressure.
e.g.
Target System Pressure = 5.0 bar
Vessel Air Pressure = 4.5 bar
5.2
Inverter Settings:
See attached
5.3
Pump Details:
See attached operating & maintenance manual.
MAB & MARB operating & maintenance
manual.
11
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