Near Intersection of I-35 & I-90 Southern Mn. | fox128 - 6/29/2026 13:49
My new to me NH3 bar has a raven accuflow system hooked up to a greenstar rate controller. I'd like to get it switched over to ag leader. Do i only need the raven adapter cable 4001266? I thought so but then was looking into schematics and am not sure about the auxiliary on/off valves....in knowledgebase they talked about another cable and having to repin some stuff to run those additional valves. so i'm not so sure.
Using a Raven Accuflow NH3 system with section shutoff's can be confusing. There are various plumbing arrangements that can be used. The wiring and configuration will depend on how your bar is setup.
I have experience with doing this with Ag Leader's Liquid Product Control module. This module can be used in a variety of situations. Probably the most common would be with a liquid sprayer. With an NH3 system, we need to be concerned about opening/closing the path returning liquid back to the heat exchanger.
Another complication is whether the system is using a Standard Control valve and a Master ON/OFF valve followed by section ON/OFF valves OR a Fast Close Valve followed by section valves.
First off, I don't believe the Raven adapter cable that I have experience with would work in SOME situations.
Those of you who have followed my posts about NH3, know that I do not care for the Fast Close systems. Many agree with me, others claim no problems.
From your picture, it appears that two heat exchangers are being used. It also appears that there are two "valves" in the area of the heat exchangers would might indicate that your bar is plumbed with a standard control valve and also a Master ON/OFF valve. If so this would agree with the plumbing arrangement that I feel is best.
Here's how I believe the system should be plumbed and the wiring that would work with it. There are other arrangements that could work.
The NH3 should enter the heat exchanger(s) and exit it to a single NH3 flow meter which is followed by a Standard NH3 control valve (rate control) which is followed by a Master On/Off valve. The flow then is allowed to branch off with a small line to the heat exchanger as the main flow splits to lead to each of the section ON/OFF valves.
With this arrangement, the Master valve would need to be ON or open if one or all section valves are ON. This would allow flow to the sections desired and also provide flow to the heat exchanger. When all section valves are OFF or closed, the Master valve should also close. This among other things will prevent flow to the heat exchanger branch. This is necessary when all sections are OFF, otherwise NH3 would be flowing through the heat exchanger at all times.
The Ag Leader Liquid Product Control module has connections for triggering the section valves as would be done with a sprayer setup. There are two pins in the Auxiliary plug that can be used either as a Master ON/OFF valve or as a Master Dump valve (for certain spray systems that need a bypass route back to the tank). Use one of those pins to trigger the Master ON/OFF valve. The configuration would need to indicate how the pin should behave (Master or Dump).
This is likely what the Knowledge base was referring to about changing some pins.
Now it is possible that your rig is plumbed with the Fast Close valve instead of a separate standard control valve followed by a standard ON/OFF valve. In that case the Master ON/OFF pin in the auxiliary port would not be used.
In either case, the configuration needs to match the physical setup.
Edited by tedbear 6/30/2026 07:39
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Raven Accuflow to Ag Leader?
