Raven AccuFlow, Installation & Operation Manual

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Chapter 6
46 AccuFlow™ and AccuFlow HP™ Installation & Operation Manual
Charging the AccuFlow™ System and
Calibrating the Pressure Transducer
The following procedure will step through the proper method for connecting and charging the AccuFlow
system.
1.
Verify that all hoses, fittings, and mounting bolts are securely fastened or tightened.
2.
Verify that the AccuFlow flow meter is connected to the flow meter connector on the flow meter cabling.
3.
Verify that the AccuFlow control valve is connected to the flow or product cable connector.
4.
Verify the on/off valve(s) are connected to the on/off connectors on the flow meter cabling.
5.
Toggle the master switch to the off position.
6.
Verify that the motorized control valves are in the ‘off’ position.
7.
Close bleed valve and all bleed ports.
8.
Turn the AccuFlow emergency shut-off valve(s) to the full open position.
9.
Connect and secure the hose from the nurse tank to the AccuFlow implement.
10.
Turn the nurse tank shut-off valve just enough to allow NH
3
to pressurize the system.
11.
Inspect the system for leaks.
a.
If leaks are detected, proceed to step 12.
b.
If no leaks are detected, skip to step 13.
12.
If leaks are present:
a.
Close the nurse tank shut-off valve.
b.
Open the bleed valve(s) located on the AccuFlow system Figure 1, “Typical AccuFlow System (Single
Section, Two Valves),” on page 12 and allow at least 60 minutes for all NH
3
in the lines to evaporate
and discharge from the system. When the system is fully discharged, the AccuFlow super cooler
should not feel cold and the pressure gauge reading on the AccuFlow system should be at zero.
c.
After the system is completely discharged, disconnect the nurse tank hose.
d.
Correct leaks and repeat step 9 through step 11.
NOTICE
Carefully read all directions in this section
before beginning this procedure and make sure
that all steps are completed before proceeding.
Review the safety requirements associated with
the handling and application of anhydrous
ammonia with a local NH
3
supplier.
DANGER
Use extreme caution when opening a
previously pressurized anhydrous ammonia
system. Exposure to anhydrous ammonia can
cause severe burning, blindness, or death.
Always wear proper personal protective
equipment when working with anhydrous
ammonia products.