42
Anhydrous Ammonia (cont.)
Troubleshooting
Refer to the console operator’s manual for most
troubleshooting procedures.
ELECTRIC SHUT-OFF DOES NOT OPERATE
Remove Hold Cutout Module and plug harness directly
to main harness. If valve works, Hold Cutout Module is
defective.
Check blue ground wire on plumbing unit for a good
connection.
Check for constant power (12 VDC) at pin “A” of the main
harness 6-pin connector.
Check for power on pin “B” of the main harness 6-pin
connector when Master Switch is in MAN and Left Boom
Switch is ON.
If blue wire on plumbing unit has good ground, pin “A” has
constant power and pin “B” has power when Left Boom
Switch is ON, shut-off valve may be defective.
NO FLOW RELATED READINGS
Remove Hold Cutout Module and plug plumbing harness
directly into the main harness. If flow works, Hold Cutout
Module is bad. (With Hold Cutout Module installed, flow will
not register unless electric shut-off is turned ON).
Unscrew flow sensor from flowmeter. Run a magnet back
and forth past senor. If console registers gallons flowmeter
turbine could be stalled. If console does not respond, unplug
6-pin connector and several times rapidly short pins “E” and
“F” on the main harness. If console responds to shorting
but not to magnet, sensor is defective. If console does not
respond, main harness is defective.
Flowmeter turbine may be stalled due to foreign material in
flowmeter. Disassemble and clean flowmeter.
ERRATIC FLOW AND/OR OPERATION
CAUSE
In hilly or rough conditions the nurse tank dip tube
will not remain submerged, allowing extra vapor in
the system. This will cause erratic operation. If the dip
tube remains out of liquid, operation may appear to
be normal, but the system is simply metering vapor. If
the system is metering vapor, manifold pressure will be
extremely low.
REMEDY 1
A round tank with bottom outlet is best for these
conditions.
REMEDY 2
Change or fill nurse tank when the NH
level is low.
CAUSE
Excessive pressure drop in plumbing from tank to
NH3500 system or plugged vapor lines.
REMEDY 1
Optimizing all plumbing and keep vapor tubes clean.
CAUSE
Flowmeter turbine may have excessive drag due to
foreign material (dirt, teflon tape, magnets, etc). or
bearing wear.
REMEDY 1
Disassemble, clean and inspect flowmeter.
ACTUAL LBS/KG PER AREA ARE HIGHER THAN CONSOLE READING
CAUSE
Flowmeter turbine may have excessive drag due to
foreign material (dirt, teflon tape, magnets, etc). or
bearing wear.
REMEDY 1
Disassemble, clean and inspect flowmeter.
ACTUAL LBS/KG PER AREA ARE LOWER THAN CONSOLE READING
CAUSE
If manifold back-pressure is too low, proper cooling
will not be achieved and small vapor bubbles will be
allowed to enter flowmeter. The console will show the
correct application rate, when in fact the actual rate is
something less than the console reading. The amount
of error may vary depending on application rates and
ambient temperature..
REMEDY 1
Use barbed fittings with properly sized orifices or an
adjustable manifold to maintain adequate manifold
pressure. Typical manifold pressure ranges fro 15 to
60- PSI (1 to 4.5 bar) depending on application rates and
ambient temperature..
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