DAB Submersible Pump Installation Instructions 2013 rev 1
10
MAXIMUM FLOW CONDITIONS
Premature pump failure may result if pumps are run for more than a short period at flow rates greater than the
following:
MAXIMUM FLOW RATE
MODEL
LPM
GPM
S4A
25
5.5
S4B
40
8.8
S4C
72
15.8
S4D
100
22.0
S4E
190
41.8
S4F
440
96.8
PRESSURE SYSTEM INSTALLATION
When a submersible pump is to be used as a pressure system, the following items are required.
A pressure tank of at least 30 litres draw off. A pressure switch, which is available from White International in a
kit complete with pressure gauge and 3 way tee piece which allows plumbing to the pressure tank. A non-
return valve at the top of the bore in addition to the pump’s in-built non-return valve is required for pressure
system application. It is recommended to install an additional gate valve (isolating valve) to allow blow down of
the pressure tank to facilitate pressure pre-charge checking.
The 2 pole pressure switch supplied with the kit may be used to break the supply to the control box on single
phase pumps up to 1.5 hp. A starter contactor must be used in addition to the control box for single phase
pumps above 1.5 hp, and all three phase pumps. One pole of the pressure switch supplied should be used to
switch the control circuit of the starter contactor.
The pressure tank connected must be large enough to provide the storage capacity and draw off to limit pump
starts to 5 per hour. Use more than one tank if necessary. Do not use “air volume control” tanks from old
model pressure systems or primitive non-diaphragm type tanks.
CAUTION:
If the available pump pressure at the bore head can exceed the pressure tank’s maximum working
pressure should there be a pressure switch failure, then a pressure relief valve should be fitted in the delivery line to
prevent the tank being over pressurised. Use only nominal 30 litre draw off tanks or larger. Do not at any time use
smaller tanks. If cut out pressures exceed 5 bar (500 kPa, 73 psi) fit a 12 bar switch. Pressure switches operated outside
their design working range can fatigue and cause pump and fittings failures and void warranty.