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I have 3 wires(red,white,and green) going to my thermostat. I’m replacing my old thermostat with a new one the requires a C wire connection. The 3 wires goes to my Honeywell aquastat. The white goes to TV, the red goes to T, and the green doesn’t go anywhere. But I do have a Z connector. Can I use the green wire as a C wire and connect to the Z? Any ideas

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    What model is your aquastat? May 26 at 11:31
  • It’s a L8148G. Thank you for replying May 26 at 12:57
  • I want to give you a full picture of what I want to do. I want to replace my old Honeywell thermostat with the new Glas thermostat. It requires a C wire. The new thermostat came with a C wire adapter. I post all the pictures to see. So now do I connect the Green wire to the Z connector on my Aquastat and make that the C wire? And the green wire going to my thermostat do I connect it in the C connector? May 26 at 14:53
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Yes, the green wire is likely an "extra" unused wire that can be used as the C wire.

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    Do you have anything to back this up?
    – FreeMan
    May 26 at 14:46
  • I want to give you a full picture of what I want to do. I want to replace my old Honeywell thermostat with the new Glas thermostat. It requires a C wire. The new thermostat came with a C wire adapter. I post all the pictures to see. So now do I connect the Green wire to the Z connector on my Aquastat and make that the C wire? And the green wire going to my thermostat do I connect it in the C connector? Thank you so much May 26 at 14:47
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Connect the green wire to Z

While some boiler relay modules (aquastat relays) don't provide a C terminal at all, yours thankfully does; it's merely going incognito. The label gives it away, though, as it states that your aquastat supports a maximum of 30VA of load between TV and Z.

Once you connect the green wire at the aquastat to its Z terminal, you can then connect your white wire to R, your red wire to W, and your green wire to C when wiring up the new thermostat, and all should be well.

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  • All did go well, thank you so much. It worked perfectly. May 26 at 23:15
  • @JeanMorisset -- we thank people around here by upvoting and/or accepting their answers :) May 26 at 23:21

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