17
tion process. Once the Flow-Clik has finished “learn-
ing” the system’s high flow zone, the light will turn to
flashing green which means that the calibration process
is complete and flow is occurring.
5. Turn the irrigation system off and set the Startup Delay
and Interrupt Period settings on the Interface Box (see
Setting the Startup Delay and Interrupt Period).
If you do not know the highest flow zone within the
system:
Flow Estimate Calibration Method
In some cases, you may not know the zone with the high-
est flow. A guideline that will help you easily determine
which zone valve has the highest flow (GPM) is to count
the number of sprinklers on each zone. If there are zones
with both sprays and rotors operating in the irrigation
system, you can multiply each spray head by 2.0 GPM,
each medium range rotor by 4.0 GPM, and each large range
rotor by 15.0 GPM for a general estimate of total flow for
each zone.
For a more accurate determination of total flow for each
zone, it is recommended that you measure the nozzle pres-
sure at each sprinkler zone and then look up the nozzle flow
at that specific pressure in the nozzle performance data
section of the manufacturer product catalog. Once a deter-
mination is made of the highest flow zone, you can use the
procedure above to calibrate the Flow-Clik to the system.
For example, Figure 1 (on the following page) shows a
typical zone using I-20 rotors. To estimate the total flow
of the zone:
1. Determine the approximate water pressure at the base
of the sprinklers in each zone while the system is oper-
ating. In the illustrative example it has been determined
that the sprinkler pressure in zone 4 is 50 psi.
2. Identify the model of sprinkler and its associated nozzle
for each valve. Valve 4 has Hunter I-20 rotors that have
various nozzles based on the distance of throw and the
arc of coverage needed. For reference, the quantities of
each type of sprinkler and nozzle configuration for zone
4 is identified in the attached irrigation legend.
3. Determine the flow rate for each sprinkler and nozzle
configuration. Based upon information found in the
Hunter Catalog the associated flows for each Hunter
I-20 sprinkler and nozzle configuration is listed in the
attached irrigation legend.
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