Xylem IM043 AQUAVAR Variable Speed Pump Control - Manual (Page 30)

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III. Single Pump - System Curve Compensation
The AQUAVAR controller can automatically
compensate for system friction losses due to
increased flow. Tables are available in most
pump catalogs indicating the amount of
friction loss that can be expected in various
sizes of pipe at different flow rates. Use these
tables to determine the friction loss for the
pipe size you are using at your maximum
flow rate.
Diagram 15 shows a typical system curve.
The system pressure set point is shown at
shut off and the pressure increase is shown
for increasing flow.
Calculate the pressure increase required to
overcome friction loss at maximum flow as
a percent of the set point.
For example, if your required system pres-
sure is 30 PSI, and it takes an additional 3
PSI for friction loss at maximum flow, the
percent increase is 10%.
Programming
H
Q
SET PRESSURE
WINDOW
f = 100%
% f
% f
% f
0
4
1
2
3
LIFT INTENSITY
10% OF
SET PRESSURE VALUE
0
0
Diagram 14