Near Intersection of I-35 & I-90 Southern Mn. | OK, so you do have 3 NH3 ON/OFF valves. One is the Master and its output has branch that leads to the liquid line to the heat exchanger and splits with a Tee. One branch leads to the left ON/OFF valve. The other branch leads to the right ON/OFF valve.
It would appear that the correct choice would be the top one in your picture since you have a two valve system where control and ON/OFF are separate. The fact that you have two more ON/OFF valves further down the line should notbe involved with the choice.
I would think that there would be another choice after choosing the top one where it allows you to choose whether you have the standard control valve or the fast control valve. Having the correct choice there is important since the controller must behave differently when working with a standard valve versus a fast valve.
Someone familiar with the Pro 700 may chime in. Possibly there is no choice and a Standard Control valve is required (would be best anyway).
Edited by tedbear 3/26/2025 11:12
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Raven control module
