DAB Submersible Pump Installation Instructions 2013 rev 1
9
INITIAL STARTING
Before connecting the pump outlet pipe from the bore, bend and gate valve should be screwed into the top of
the bore cap as a pump valve.
With the gate valve just slightly open, start the pump.
NEVER START THE PUMP AT FULL FLOW FOR
THE FIRST TIME
Immediately the pump has been started, catch some of the discharge water in a large container and allow the
solids to settle out. If little or no sand appears, open the gate valve to 1/3 and pump until the water is clean.
For the first 10 to 20 minutes of operation, it is suggested to keep the gate valve only partially open, to maintain
a low flow which will prevent turbulence in the well near the pump and possible seizing of the pump due to
excessive sand in the water.
If excessive amounts of sand or other solids are being pumped, shut the pump down, and have the bore
attended to before restarting the pump.
Submersible pumps are not guaranteed against failure due to pumping sand. Pumping of sand of even very fine
small quantities will shorten the effective life of any pump.
NEVER OPEN THE GATE VALVE ABRUPTLY
as this may raise sand and deposits.
The pump should be run for a period of 30 minutes to check that it does not pump the bore dry.
This would be obvious by large fluctuations on the pressure gauge and the ammeter as the pump flow surges.
Continuing operation in this manner could cause serious damage to the pump and motor due to shock
pressures as the pump alternately takes up and loses the hydraulic load. This effect is generally referred to as
“snoring”.
If in doubt about the draw down level of the bore, the use of level controller is recommended. If probe type is
used, the probe should be located to switch the pump off when the bore water level drops within 1 metre of
the pump suction. The use of a high level probe to automatically turn the pump on is not desired, as a rapid
cycling of the pump could occur causing severe damage to the unit. Time clock or manual restart is
recommended. Alternatively a probeless control such as TESLA GUARDIAN can be used.
MINIMUM FLOW CONDITIONS
Premature pump failure may result if pumps are continuously run at flow rates less than the following:
MINIMUM FLOW
RATE
MODEL
LPM
GPM
S4A
6
1.3
S4B
10
2.2
S4C
20
4.4
S4D
33
7.3
S4E
66
14.5
S4F
150
33.0