45
844E Sprayer Crontrol
98-70006 R3
CONDITION
POSSIBLE CAUSE
SOLUTION
4
Rate oscillation
A
Extreme low regulated
fl
ow
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 27) 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
23 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 23 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
fl
ashing
symbol will also indicate
if the
fl
ow meter has stalled. Inspect
fl
ow meter for obstructions. If
fl
ow 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
fl
ow meter to stall and
no
fl
ow 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.
