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Operation (continued)
Do not remove any caps while the pump is operating.
If an ‘offset’ injector installation is used, it may not be practical to ensure
an even suction rise from the water source to the pump. If this is the case,
install a tee in both the suction and pressure pipes at the highest point(s)
for ease of priming. Install a plug in the unused branch of each tee.
To obtain maximum capacity from your deep well pump, it should run at
the minimum recommended operating pressure. If pressure is allowed to
fall below this level, the injector may not operate correctly and the pump
will lose prime.
The minimum operating pressure can be maintained by partially closing
the gate valve. To set the valve turn on all taps and any other outlets
that are likely to operate together, pump the bore/well down to it’s lowest
level and adjust the valve so that the minimum operating pressure is
maintained.
Pressure Tank Air Charge
Follow these steps to correctly set the pressure tank air charge.
1. Switch the power to the pump OFF and ensure the pump is
electrically isolated.
2. Turn on all taps and let them run. This will empty the pressure tank.
3. Check the air charge in the tank with a tyre gauge or similar.
4. Inflate the tank to 10% below the cut-in pressure of the pressure
switch setting e.g. 125kPa if pressure switch setting is 140 -280kPa;
190kPa if pressure switch setting is 210 - 350kPa.
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