5. Commissioning / Operation ATTENTION
Filling
Ensure no fluid drips onto the pump motor or its electrical connections during installation,
venting or operation as when the pump is energised this may create a risk of electric shock.
In normal operation the pump surface can be hot (up to 125ºC) creating a risk of being burnt.
Water and water/glycol mixtures in the ratio of 1:1.
Glycol mixtures require a reassessment of pump hydraulic data in line with the increased
viscosity and depending on mixing ratios.
Use only approved makes of additives with corrosion inhibitors and follow manufacturer's
instructions.
Do not leave system empty without protection from corrosion inhibitor.
During this operation ensure the pump is switched off.
Open both valves either side of the pump.
Venting / Manual Restart
Protect all electrical parts against the leaking water
During this operation be aware of the risk of scolding from escaping hot water or steam.
When the system is filled with water the pump will normally self vent air within a short
while of switching on.
In cases where the pump venting is slow (identified by pump noise) the pump bearings may
be quickly vented by using: -
(a) the manual restart knob. Switch off the pump. Unscrew the manual restart Fig 3b
applying sideways pressure to the screw, with a screwdriver, until water emerges from it.
Screw the manual restart knob back in. Switch pump back on
(b) vent plug Switch off the pump. Close valve on the discharge side. Carefully loosen and
fully remove the vent plug with a suitable screwdriver Fig 3a , carefully push pump shaft
back several times with screwdriver. Switch on pump. It is possible that the pump blocks
with the vent plug open, depending on the system pressure. After 15 – 30 s tighten the
vent plug. Reopen the valve
Note, a system may take 24 hours to vent all the air in the system to atmosphere
ATTENTION
DO NOT run the pump dry as this will result in bearing failure.
Speed Regulator – Standard Pumps
Speed regulator adjustment should only be made with electrical supply
switched off
Models offer a single or variable speed setting to allow system requirements to be accurately
met. Fig 4a
11
GB
8573 Nocchi Booklet 12 linguil 4124349:Pentair Water Italy Srl - Reb