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    Done. The voltage between the R wires is now...

    Done. The voltage between the R wires is now 3vac. I get 24v between the TV and Z/T terminals. However, I get 24v between Z/T and ground--Doesn't this mean that the system isn't isolated and I...
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    Found it! Here's the setup for my boiler...

    Found it! Here's the setup for my boiler. I think I've figured out all the components in my boiler system. My initial pic was of the ignition control module. Second pic is the transformer--that...
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    Not sure what's a center tap? Behind the tag...

    Not sure what's a center tap?
    Behind the tag there's a screw terminal labeled "W". Underneath all 3 terminals is "thermostat". The black wire goes to a terminal "Z".23630
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    Oh, I know I'm overthinking things (see last...

    Oh, I know I'm overthinking things (see last post). Which is causing me to get confused over multiple simple things. But I don't have a separate power supply for the stat. I could add one, but I'd...
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    OK, so looking back there a bit more, it would...

    OK, so looking back there a bit more, it would appear that I'm measuring from the wrong terminals. Not sure what the box is posted above, but took another pic of what I think is relevant. So on the...
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    Most of the Wifi stats that I've seen have some...

    Most of the Wifi stats that I've seen have some sort of web interface or proprietary app. This one is really cheap, and would work very well for most installations. I've had it for 2 years...
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    Heard back from customer service at motison. ...

    Heard back from customer service at motison. They said that if I have no voltage between the 2 R wires, then I can connect them both to the R terminal on the stat. Unfortunately, I have 50v between...
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    Right, although I'm thinking of ground in this...

    Right, although I'm thinking of ground in this case as just a return path for current.


    How do I find that out?



    Well, I hooked up both 24v wires to the R terminal of the Lennox stat. From...
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    I may have my answer. This article...

    I may have my answer. This article was very helpful, particularly the diagram on page 8. While I was correct in my assumption that the 24v powers a relay, I had thought that the negative terminal...
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    Fair enough. The specific stat isn't the issue...

    Fair enough. The specific stat isn't the issue here, it's more general as to whether I need a stat with separate Rh and Rc terminals. That's actually the only practical question that I need...
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    And why am I getting 28v from my a/c system?...

    And why am I getting 28v from my a/c system? Would that make a difference?
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    I'm hearing 2 different things here I think. I...

    I'm hearing 2 different things here I think. I don't understand what actually happens at the boiler. I assumed that when stat calls for heat, the 24v red wire was connected to the W. Further...
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    No, the stat that I'm testing with is battery...

    No, the stat that I'm testing with is battery powered. The boiler is 2 wire without a common, only red and white wires.
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    So I should be able to run the R 24v feed from...

    So I should be able to run the R 24v feed from the a/c unit to the stat and power both units, and just tape off the feed from the boiler, right? I don't have the new stat yet (I'm taking it from...
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    Thermostat Wiring question

    So I have a standard a/c system wired to one thermostat (lenox 51m34) and my 2 wire gas furnace wired to another. I'm trying to consolidate them onto one thermostat. Ran new wire to replace the knob...
  16. Oh, I see. That was I guess my original...

    Oh, I see. That was I guess my original question. I was looking for a special made pipe/vent to do that. So I could just buy an oversized roof vent and stuff both vent runs into it...
    What about...
  17. Right. What you're talking about is a fantech or...

    Right. What you're talking about is a fantech or similar setup with a central fan, correct? As another route, is it acceptable to terminate the run by going through the soffit? I know you can't...
  18. I wasn't planning on connecting the ducts; what I...

    I wasn't planning on connecting the ducts; what I was hoping for was a circular piece that penetrated the roof. Within that piece would be 2 separate chambers, each of which would be exhausting 1...
  19. For some reason I thought that wasn't allowed? Do...

    For some reason I thought that wasn't allowed? Do you have a link to the dampers that you're referring to?
  20. Ventilation for 2 bathrooms/1 roof penetration?

    I'm installing a bathroom directly adjacent to the existing one. The current vent exhausts air directly into my attic insulation. I'd like to remedy that, as well as install a proper vent in the...
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    So, is this...

    So, is this what you're talking about?
    And this is the fixture fitting?
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    I couldn't find anything comparing the flow...

    I couldn't find anything comparing the flow rate/pressure drop/whatever of nominal copper v. PEX sizes. But yeah, I guess I might as well do 1" if I redo it. I'll probably keep the 1/2" Cu trunks...
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    Yeah, so the plan is to have all 3 of those vents...

    Yeah, so the plan is to have all 3 of those vents tie together (2 will join in the bathroom from the sinks, and then that vent will join the original from the shower) and then have that one vent exit...
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    Proper way to drain/vent dual vanities?

    I'm putting in double sinks in my new bathroom. Original plan was to plumb the drains and supplies through the floor, but it seems like the correct way to do this is to stub out through the wall. ...
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    So I took another look at my main; it's 3/4", but...

    So I took another look at my main; it's 3/4", but for some reason reduced to 1/2" immediately upon entering the house. So I think that my plan will be to pipe 3/4" pex off of the 3/4" main. I'll...
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