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Tarm mixing valve setting?

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by nporter, Jan 4, 2009.

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  1. Rory

    Rory Member

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    My Termovars have a little arrow on top that can be turned. The rep from Revision Energy had me turn it to 45 degrees (compass), saying that would cause a little restriction and it would work better. He claimed that the Termovar is basically a ball valve.

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  2. nporter

    nporter Member

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    Alright now that the Termovar has been explained I went down to check mine out and the port matching is not as Chris described. I understand Chris' explanation but if that is the case mine looks backwards. (not a first for me) So then I went to check out the Manual (p. 66) to see what that showed. It seems to indicate that the feed from the wood boiler goes in at port 2, port 1 is the return from the zones and port 3 is the return to the wood boiler which is what I have set up.

    I have port 1 restricted 45° angle but is that what I need? Isn't that restricting the flow to the zones?

    Does the Tarm design make sense as described above or am I just reading it incorrectly and should the Termovar be changed around to have port 1 matched with water from wood boiler and port 2 matched with return water from zones?

    Still learning! It is amazing what one can learn through reading and taking few moments to digest it all.

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  3. hoth2oguy

    hoth2oguy New Member

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    Thanks DaveBP, we have appreciated this forum and have sent people here frequently. Especially if they are looking to come up with their own tank system. Lots and lots of other good info too, of course.

    Sorry about the link above, glad you figured it out.

    I love the 'mad scientists out back' image! Travis spent most of the week running tests in the dungeon this week and by the end of the week the label surely fit! We are also fond of "boiler geek"!

    What you say about the thermosiphon makes good sense. Now that we have the pressurized storage, we will have to get the back flow loading unit it to test. Would be a nice set up.

    As far as being on 'the inside' I am not the most technical person and I am sure I will mis-state something here eventually! Good news is that there is a crew of first class boiler geeks here and at the office that will set me straight when I do! :) Thanks for being here.
  4. DaveBP

    DaveBP Minister of Fire

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    I think there is a confusion of terms in this thread that I've noticed before in other threads. Termovar is a name that ACASO uses for a number of different thermostatic valves they make for different uses in hydronic systems. Most often on this forum "Termovar" is used to mean the return protection device just before system water returns to the wood boiler. But there are other uses for other variations of these thermostatic devices. And, frankly, I don't understand some of the distinctions.

    Than, I think some of the posts in this thread are referring to a different "Termovar" than the one in the zoomed in part of the Tarm diagram you refer to. It looks to me like the port numbers are different, too. Your closeup view Termovar is protecting the oil boiler, isn't it?

    But then I just spent the afternoon gluing foam panels to studs. Maybe too many fumes?
  5. nporter

    nporter Member

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    Regarding the port #'s I agree the orientation is different and the port #'s are different but I was curious if that was simply a computer graphic orientation thing that was unclear in the manual or if it really was to protect the oil boiler.

    Mine is set up with port 3 going down to the return, so it protects the wood boiler but I think that there may be issues with my other two ports. Some times I am amazed that this thing is working the way it is presently set up. More research and alterations and we will be in a better place I'm sure.

    I guess that a call to Tarm might be the next step for me because my mind is addled and there were no fumes for me today.
  6. nporter

    nporter Member

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    DaveBP yes you are correct. I was assuming that the Termvar that has been installed is a mixing valve and we were treating it as such and it is one but....

    As you pointed out, and what I was confused over, is the fact that the Tarm diagram is calling for a Termovar Diverting valve not a mixing valve. Only one digit off. (6440A-3 as opposed to 4440A-3) Thanks for causing me to take a closer look. Now things are starting to fall into place! At least for the moment.

    So looks like the mixing valve should come out and a diverting valve put in. Hey at least the wood burns and makes heat. I just can't seem to get it moved around all that well.
  7. hoth2oguy

    hoth2oguy New Member

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    so just to be clear, yes, Termovar actually refers to several different valves mad by ACASO, but when we talk about it we are generally referring to the mixing valve close to the wood boiler. This is shown as TV1, or in this case C3 (part number K4440A3) on our drawings. Actually this drawing is showing the loading unit which incorporates the mixing with a circ pump - location F on the drawing is what I am trying to say.

    Also correct that TV2 is a valve made by ACASO with the part number K6440A3. We refer to this as a diverter valve and it is used in conjunction with storage. If you have a K4440 at TV2, it should be replaced with a K6440. Look very carefully, however, because the valves look virtually identical. The easiest way to tell externally is that the red arrow / swoops on the aluminum plate look just a bit different from one another. If I had to bet, I would bet you have the correct valve in each location as ReVision really knows what they are doing. Stranger things have happened, however, so give us a call on Monday if you still have questions.
  8. Miner3

    Miner3 New Member

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  9. Miner3

    Miner3 New Member

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    Page two of the post shows the difference between the inside diameter of the 1-1/4" copper & the Termovar fittings.
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