Process 1:
Process 2: Station Catch Can Audit
Process 3: Sprinkler Type Default
Manufacturer's Charts and PR Calculations
1.
Determine if the head layout is in a square or triangular pattern.
2.
Verify that you have head-to-head coverage and the nozzles are
installed for matched precipitation; a general rule of thumb is: as
the spray arc doubles, so should the flow.
3.
You can use the manufacturer's PR rates if you have fixed spray
nozzles within the same radius family or if you have
rotors/impacts that are all 180° arcs with the same nozzles.
4.
If you have matched PR nozzles, use this formula for square spacing:
If you have matched PR nozzles, use this formula for triangular
PR = [GPM(foranyarc)
x
34,650] ÷ [Degree of Arc
x
Head
Spacing (ft.)
x
Row Spacing(ft.)]
PR = [GPMof 360° arc
x
96.25]÷ [HeadSpacing(ft.)
x
Head
Spacing (ft.)
x
.866]
5.
Enter PR data into the controller.
Perform a system audit per the Irrigation Association's Certified
Landscape IrrigationAuditor (CLIA) criteria. For information on the
CLIA program, contact the Irrigation Association at:
www.irrigation.org.
1.
If the first two processes are not possible, then set the controller
to the default precipitation rate for each zone's sprinkler type.
2.
Process to use the defaults:
•
In the programming process, select the sprinkler type for
the desired zone.
•
Turn the
Upper Line
knob to set the precipitation rate.
do not change the default setting.
•
Continue with programming the station.
70
spacing:
