iCON
iSOLAR 3”
PDP Instruction Manual
13
11. Installation cont.
Pressure pipe selection
Helical rotor type pumps such as the iSOLAR PDP are able to generate very high
pressures, particularly if they continue to operate in a no-flow situation.
Where practical, an open loop system is desirable.
Model
Hmax
Approx. pressure Bar/PSI
PDP3 250
60m
5.7 / 82.6
PDP3 370
80m
7.8 / 113.1
PDP3 750
140m
13.7 / 198.7
•
Select and use suitably pressure rated water delivery piping.
•
It is strongly recommended to fit a switching device to the delivery line to prevent closed
head operation.
Pressure pipe sizing
The iSolar PDP3 range has a maximum output flow of 25 lpm so the resulting pipe friction
losses are low. The correct pipe sizing allows for the possibility of very long delivery piping.
The
following table is a ‘worst possible case’ example. The
pressure loss values per 100m of
pipe length are for 16 bar rated pressure supply pipe at 25lpm.
Pipe size
Friction loss per 100m
of pipe at 25 lpm
If unsure, increasing the pipe
size by one size will result in
a substantial reduction to the
pipe friction losses.
MD
25
PN16
14.60m
MD
32
PN16
4.55m
MD
40
PN16
1.56m
MD
50
PN16
0.53m
Note this table does not automatically infer the need to use 16 bar pressure rated pipe.
Optional switching
•
An input connected to TL/TH and COM terminals allows the user to fit some form of switch
such as a float in the destination tank to turn the pump off when the tank level has risen.
Alternately, by fitting a double acting ballcock to the tank inlet a suitably adjusted pressure
switch will turn off the pump when the ballock closes (tank full) and the pipe pressure rises
•
When the switch circuit stops the pump running, the LED on the controller l
abelled ‘TANK’
will illuminate. When the float or pressure switch circuit opens again pump operation will
re-commence immediately.
