Timeline for Where's the C terminal on my boiler control?
Current License: CC BY-SA 3.0
17 events
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| Apr 13, 2017 at 12:22 | history | edited | CommunityBot |
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| Oct 30, 2014 at 18:49 | comment | added | Tester101 | That's just inconvenient that there is an S1 & S2 terminal on the board. | |
| Oct 30, 2014 at 18:44 | comment | added | Tester101 | @Mazura Not S1 and S2 on the board. I meant the Secondary 1 and Secondary 2, you know on the transformer. Where P1 and P2 are the primary contacts, S1 and S2 are the secondary contacts. | |
| Oct 30, 2014 at 18:08 | comment | added | Mazura | @Tester101 The board shows S1 and S2 and they look jumped...? | |
| Oct 30, 2014 at 12:16 | comment | added | Tester101 | @Mazura the little zigzag labeled 1k is a coil, not a resistor. | |
| Oct 30, 2014 at 4:08 | history | edited | Mazura | CC BY-SA 3.0 |
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| Oct 30, 2014 at 1:41 | comment | added | Hank | @MikeN: I agree with Mazura's latest comments, it looks like the C terminal is not visible in your photos (and possibly isn't accessible at all). Tester101 has a great answer about what the C wire is and where it attaches, which may be helpful in locating yours: diy.stackexchange.com/questions/10482/… | |
| Oct 30, 2014 at 1:26 | history | edited | Mazura | CC BY-SA 3.0 |
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| Oct 30, 2014 at 0:36 | comment | added | Mazura | You have +24v, (R), what you don't have is a ground return, (C). @MikeN | |
| Oct 30, 2014 at 0:13 | history | edited | Mazura | CC BY-SA 3.0 |
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| Oct 30, 2014 at 0:07 | comment | added | Mazura | Without verifying it with a tester (that it provides 24v to ground), I"d guess it's the T terminal with the RED wire. Henry was correct, I was wrong. The white wire is not C, it is merely a switch leg. I am unsure if you can just ground it (the green wire) out to the control box of the boiler, and attach it to C on the thermostat. You need access to the other wire off the secondary transformer coil, which will be difficult with it mounted on a board. | |
| Oct 29, 2014 at 23:14 | comment | added | Mike N | im so confused!!!!!!!!! So where would I place the unused green wire to get 24v power into it, so i can attach it to the back of my thermostat? | |
| Oct 29, 2014 at 22:55 | comment | added | Mike N | i have 2 zones but yes from what i can tell they are correct Henry. Any ideas what to do? | |
| Oct 29, 2014 at 22:48 | comment | added | Hank | @MikeN: No: if you're saying the thin red and white wires that we see in the upper right go to your thermostat's Rh and W, respectively, then that means this answer is wrong. The C wire should not connect to the W wire, it's a 3rd terminal. | |
| Oct 29, 2014 at 22:43 | comment | added | Mike N | The back of the old thermostat has a red wire going to the RH and the white wire going to the W. The photos above are of my Aquastat L8124A. So just connect the unused green wire to the same terminal as the white and then on the back of the new thermostat put it in the C spot? | |
| Oct 29, 2014 at 22:31 | comment | added | Hank | How can you tell the white wire is C and not W? Since there's only two wires in that cable, I would guess those are Rh and W, going to the thermostat. But I'm not really sure. | |
| Oct 29, 2014 at 22:01 | history | answered | Mazura | CC BY-SA 3.0 |