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Verifying AccuFlow™ Operation
Once the AccuFlow system is charged, the system is ready for the application of anhydrous ammonia to the
field(s). The following items should be checked periodically to ensure proper operation of the AccuFlow system
and application of anhydrous ammonia:
Verify that the implement/boom widths, speed cal, meter cal, valve cal, and rate cals have been
1.
programmed correctly on the console (refer to the control console's Operation manual for details).
Toggle the console to manual control mode.
2.
Toggle the master switch to the off position.
3.
Toggle the switch for section 1 (boom 1) on. If a multi-manifold system is in use, toggle all sections on.
4.
Toggle any section switches not in use to their off positions.
With the master switch in the off position, drive at the target application speed to verify the speed readout
5.
on the console.
With applicator knives in the ground, toggle the master switch to the on position.
6.
While driving at the target application speed, manually adjust the flow with the INC/DEC switch until the
7.
target rate is achieved.
Note:
The manifold pressure must be greater than 10 PSI to ensure proper operation.
Toggle the console to automatic mode. In automatic mode, the console will adjust the control valve
8.
automatically to maintain the target rate regardless of vehicle speed.
If the console is not capable of maintaining the target rate, refer to Issue 12 in Chapter 8, Troubleshooting.
After two minutes of continuous operation, record the AccuFlow temperature and pressure from the two
9.
gauges mounted near the AccuFlow super cooler.
Note:
These gauge readings must be obtained while the AccuFlow system is actually applying NH
Readings will be incorrect if the system is shut off, even momentarily.
Refer to Figure 2 on page 30. Find the intersection point of the recorded gauge readings on the chart. This
10.
point must be located in the non-vapor area (above the line). If the intersection point is outside of the
non-vapor area (below the line), refer to Issue 18 in Chapter 8, Troubleshooting.
For Example:
Given an observed pressure reading 70 PSI and temperature reading 40° F. The point where these two
readings intersect is within the non-vapor area. See Figure 2, "Pressure vs. Temperature Chart," on
page 30.
If an additive such as N-Serve (Dow Chemical) or ACA (Amoco) is used with the system, periodic cleaning
11.
of the AccuFlow flow meter may be required. Refer to Chapter 7, Service and Maintenance, for instructions
on performing maintenance on the AccuFlow cooler or flow meter.
Manual No. 016-0171-496 Rev. C
Standard AccuFlow™ Calibration and Operation
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