Raven AccuFlow, Installation & Operation Manual

Page: 67 / 90

8
Manual No. 016-0171-496 Rev. C 63
Troubleshooting
Issue 18:
Pressure and temperature gauge readings indicate that NH
3
passing through the AccuFlow flow meter is not in
a liquid state.
Solutions:
1.
Check that the vapor tubes have been affixed to the applicator knives correctly and that the openings for
NH
3
are not plugged or filled with debris.
2.
If additives such as N-Serve or ACA have been or are being used with the AccuFlow system, disassemble
and clean super cooler chamber. See Chapter 7,
Service and Maintenance , for more information about
servicing the super cooler.
3.
Determine if the operating pressure drop is within tolerances. See step 5 addressing Issue 1.
Issue 19:
HP boost pump does not reach target pressure.
Solutions:
1.
Check the HP boost pump hydraulic connections and verify proper connection to remote hydraulics on
tractor. Inlet (small hose) should be connected to remote pressure and return (large hose) should be
connected to remote tank.
During operation, the return line from the AccuFlow hydraulic motor and check valve should be soft in
comparison to the inlet hose.
2.
Ensure tractor remote ports are engaged and pressure is adjusted to provide sufficient flow rate to HP boost
pump. Refer to the
Verifying AccuFlow HP™ Operation section on page 47 for details on adjusting the
remote tractor hydraulics.
Note:
Remote hydraulic settings do not typically indicate an exact flow rate.
3.
Verify that the target rate (not the pressure cal) is set 5 to 10 PSI [34 to 68 kPa] above the observed
AccuFlow system pressure (not tank pressure).
Note:
Refer to the Charging the AccuFlow™ System and Calibrating the Pressure Transducer section on
page 46 to set the pressure cal. The pressure cal is typically only set once per application season
to calibrate the transducer.
WARNING
Anhydrous ammonia may be under pressure.
Before disconnecting any fittings or hoses, be
sure to purge the system of all liquid NH
3
(see
the Discharging the AccuFlow™ System
section on page 50).