33
CONDITION POSSIBLE CAUSES SOLUTION
E Flow meter plumbed incorrectly A flow directional arrow is located on the body of the
flow meter. Plumb the flow meter with the arrow in the
direction of the flow.
The flow meter must be mounted 10˝ to 12˝ (25-35
cm) from other pipe fittings. See 844 Installation
Manual page 5.
Generally, the flow meter works better when mounted
in a vertical position with the flow being directed up.
F Pump Capacity too low Check the pump to make sure it is working correctly.
Check the plumbing system for any obstructions.
Reduce Agitation Volume.
G Pump Capacity too high Some centrifugal pumps provide more flow than
necessary for the application. A throttle valve is
sometimes required to restrict the flow coming from
a centrifugal pump.
Increasing bypass and agitation volumes can also
help when flows are too high to reach the target
application.
3 Flow meter turbine symbol A Stalled Flow meter Make sure there is no pressure in the system.
continually flashes on/off.
Remove the flow meter from the discharge line.
Inspect the inside of the meter for obstructions. The
turbine should move freely. If it does not rotate easily,
try flushing it out with clean water. If it remains stuck,
remove the turbine by releasing the retaining clip.
Clean the turbine carefully and make sure it rotates.
Replace the turbine into the flow meter body and
secure with the retaining clip.
If you have a rapid check flow meter, remove the
turbine from the flow meter body by unthreading it at
the sensor. Check the turbine for obstructions. Flush
with clean water or disassemble if necessary.
Check to ensure that the sprayer pump has been
engaged while trying to spray.
Check cabling for any loose connections.
4 Rate Oscillation A Extreme low regulated flow Due to very low application rates (GPA,
G/1000 ft
2
)
,
l/Ha) the regulating valve in throttling mode is
operating in an almost closed position.
Adjust the Reg. Valve Speed Number in the System
Setup Mode (page 21) to a slower value.
Plumb the regulating valve in bypass mode. This
should allow the regulating valve to operate more in
the center of its rotation. If you change from throttling
mode to bypass mode, you must reprogram the
Pressure Regulating Mode in the System Setup
mode. Refer to page 17 of the 844 Installation
Manual.
5 Sprayer stops spraying while in Auto Mode. A Pressure Regulating Mode is Check the Pressure Regulating Mode in the
programmed incorrectly. System Setup mode of the 844. Refer to page 17 of
the 844 Installation manual to insure that the controller
has been correctly programmed for the regulating
valve position on your sprayer.
B Flow meter stalled A flashing symbol will also indicate if the flow
meter has stalled. Inspect flow meter for obstructions.
If flow meter turbine is impaired,
clean and replace.
Sometimes when the regulating valve closes too far,
maybe even complete shut-off (with ball type
regulating valves), this can cause the flow meter to
stall and no flow or pressure regulation will occur.
Press the Auto/Manual key so that the LED indicates
“MAN” mode, depress the key for approximately
three seconds. You should see the tips begin to spray.
Press the Auto/Manual key so that the LED indicates
“Auto” mode, and continue to spray.
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