Xylem IM098 AQUAVAR Model 56 Controller - Manual (Page 22)

III. Single Pump – System Curve Compensation (Flowchart #3)
The AQUAVAR Model 56 Controller can
automatically compensate for system friction losses
due to increased flow. Tables are available in most
pump catalogs (including the G&L Pumps catalog)
indicating the amount of friction loss that can be
expected in various sizes of pumps 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 8 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 pressure is
30 psi and it takes an additional 3 psi for friction
loss at maximum flow, the percent increase is 10%.
Programming
17
Diagram 8
H
Q
SET PRESSURE
WINDOW
f = 100%
% f
% f
% f
0
4
1
2
3
LIFT INTENSITY
10% OF
SET PRESSURE VALUE
0
0