Dutypoint VT Booster Set, O & M Manual

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Refer to the above table.
To verify the precharge pressure:
1. First check that the expansion or pressure vessel(s) are totally drained of water, and that
the system is switched off and no electrical parts are live.
2. Locate the charging valve on each vessel, accessed by removing the plastic cover on the
top of the vessel.
3. Connect a portable pressure gauge with a measuring range compatible with the expected
pressures in your application, which has a flexible hose and Schrader- type connector to
the charging valve.
4. Check the pre-charge pressure above the diaphragm in each pressure vessel
[ Accumulator ]. correspond to criteria given in the text above.
5. If necessary, release or add additional air to correct.
3. Venting Pumps
It is important to bleed all air from the pump body before initial start-up.
Procedure for flooded suction
Flooded Suction is defined as the condition where there is positive pressure on the suction (inlet)
side of the pump(s) as is the case where the storage tank water level is at the same or higher level
than the pump bleed point.
This procedure should be carried out individually for each pump in the Pumpset.
1. This procedure should be carried out individually for each pump in the Pumpset.
2. Open all valves on the suction (inlet) side of the pump.
3. Using the vent screw at the top of the pump (refer to Appendix A to locate), allow any air in
the pump body and suction pipework to vent to atmosphere.
4. When water (under pressure from the storage tank feeding the pump on the suction side)
escapes through the vent screw hole - and no more air bubbles can be seen - close the
vent screw.
5. Switch on the electrical supply to the pump motor and start the pump in AUTO mode. As
each motor starts verify that the direction of rotation correctly corresponds with the
direction of the arrow shown on the body of the pump. If rotation is backward STOP, switch
off the pump and investigate.
6. Slowly open the valve on the discharge manifold outlet to the system allowing water to be
pumped into the system.
7. Switch off, re-close the discharge valve and repeat steps 3 to 6 several times to ensure
that all air is released from the pump body and local pipework.
8. The above procedure should be carried out individually for each pump in the Pumpset.
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VT Booster Set