TeeJet 844-E Sprayer Control - Manual (Page 31)

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98-70006-ENUS R4
844-E Sprayer Control
Condition Possible Cause Solution
3. Flow meter turbine symbol
continually flashes on/off
A. Stalled Flow meter Make sure there is no pressure in the system.
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 17) 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 16 of the 844 Installation Manual.
5. Sprayer stops spraying while in Auto
Mode.
A. Pressure Regulating Mode is
programmed incorrectly
Check the Pressure Regulating Mode in the System Setup mode of the 844. Refer to
page 16 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 turbine 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 Plus key
for approximately three (3) 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.