1.
Rate display is inaccurate
or unstable.
PROBABLE CAUSE & CORRECTIVE ACTION
PROBLEM
This is a Dickey-John Flow Sensor. (Fig.1) Usually a faulty flow sensor is responsible for this
issue, but before replacing the flow sensor, try the following:
1.
Check to see if your strainer is plugged. (Fig. 2)
2.
Check the opening on your Continental cooler. There is a small 3/8” hosebarb in the elbow after
your control valve. Remove
the barb and make sure it’s not plugged. (Fig.3)
3.
Verify that there is product being discharged from each of the vapour tubes – If not,
disassemble and clean out your supercooler with compressed air.
4.
Unplug, check and reconnect all wiring harnesses – just one corroded pin, or loose connection
could cause the system to malfunction.
5.
Check the voltage on the tractor side of the flow sensor connection.
Voltage should read 12V across red and black 9V across black and green (Fig.4)
Power at flow sensor:
Black + Red 12V
Black + Green 9V
6.
If there is no voltage, you have a faulty cable or connection. Check or replace implement
harness.
7.
If there is voltage, remove the flow sensor and check to see that the paddle wheel inside the
flow meter is spinning freely. If the paddle wheel spins freely inside the flow meter, replace the
flow sensor.
Does the Valve Operate in Flush? If it does, check your speed cable
connections. If it doesn’t, test the voltage on the tractor side of the control
valve connection (Fig. 5)
Power at Actuator Connection:
Red + Black 12V Always
Black + White 12V Flush Switch Off
Black + Brown 12V Flush Switch On
The flow of NH3 through your metering system is solely controlled by tank pressure. When
applying in colder temperatures, tank pressure will drop. If tank pressure drops too low, your
cooler will be starved for product, which causes rates to fluctuate. Your options are to slow down
or try the following:
1.
Increase plumbing size from tank.
2.
Upgrade to a high flow breakaway.
3.
Use a larger nurse tank with a high-flow withdrawal.
4.
Upgrade to a higher capacity supercooler.
2.
Control Valve will not
operate in auto.
3.
Are you still having issues?
Fig. 4
Fig. 5
Fig. 3
Fig. 2
Fig. 1
DICKEY-JOHN TROUBLESHOOTING
20