Pentair ONGA FARMMASTER JJ Series, Owner'S Manual

Page: 7 / 24

7
Installation (continued)
d) Suction
To maintain optimum performance from your pump, the suction pipe
should be:
•
Kept to the shortest length possible - place the pump as close to
the water source as possible.
• Re-enforced crush resistant (non-collapsible) hose or pipe.
• All fittings should be air tight.
• Pipes should be equal to or larger than the diameter of the suction/
inlet port.
• Ensure that the suction is completely submersed.
• Ensure a footvalve is fitted to the suction line if the pump is installed
in a suction lift application.
• A checkvalve should be fitted on a flooded suction installation.
For further information on suction piping, refer page 8.
e) Discharge
The length and diameter of the discharge hoses or pipe will effect the
pressure and flow rate at which your pump operates. Pressure ratings of
all components
must exceed the maximum pressure of the pump by an
appropriate safety factor. For correct sizing of the delivery line refer to the
relevant pipe friction tables for the type and grade of pipe used.
Galvanised steel, PVC or polythene pipe may be used for the delivery line.
A short length of polythene pipe should be used on the suction and
discharge sides of the pump to prevent noise from being transmitted.
A shut-off valve should be installed on the discharge line so that the
system can be isolated if required.
f) Pressure Switch
All manufacturer supplied pressure switches are factory preset to the
lowest pressure setting of the pump range. This suits most requirements.
If high pressure injectors are used the pressure switch settings will need to
be altered to the new cut-in and cut-out settings. If you are unsure as to
what the settings should be for your particular installation, seek advice
from your local pump dealer.