Raven AccuFlow, Installation & Operation Manual

Page: 65 / 90

8
Manual No. 016-0171-496 Rev. C 61
Troubleshooting
Issue 13:
Rate display is inaccurate or unstable.
Solutions:
1.
Verify that all calibration values are entered correctly on the console (see the console operation manual for
instructions).
2.
Verify the speed display is registering accurately.
If speed display is inaccurate, troubleshoot the speed sensor according to the procedure addressing Issue
10.
3.
In manual (MAN) control mode, verify that the rate display holds a constant value.
If the rate display is unstable, see Issue 17 for further troubleshooting tips.
4.
Hoses connecting the AccuFlow system should not exceed 15’ [4.5 m] of 1-1/4” hoses and a 1-1/4”
breakaway.
5.
Remove any street elbows and replace with a conventional elbow and nipple.
6.
Refer to the Chapter 7, Service and Maintenance , to clean the flow meter and y-strainer screen and magnet
assemblies. These procedures should be performed periodically or when system performance degrades.
Be sure to follow the instructions in the
Discharging the AccuFlow™ System section on page 50 before
performing maintenance on the AccuFlow system.
7.
Verify that the nurse tank has a high flow valve.
Issue 14:
Rate does not change in either manual or automatic control modes.
Solutions:
1.
Check the control valve cabling for wear and breaks.
2.
Check and clean cable connections as necessary.
3.
Check the voltage at the control valve connector by:
•
Powering on the console.
•
Set the master switch to the ‘on’ position.
•
Set all products or the console to manual (MAN) control mode.
4.
Hold the increase/decrease (INC/DEC) switch. With the INC/DEC switch in operation, check for voltage at
the control valve.
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).