topic Re: C wire hook up on the TACO box in Nest Thermostats https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/64775#M14679 <P>I would keep the Nest, they look nicer in my opinion and once your setup works you should be good to go. Getting another transformer for the thermostat will work for sure, go with that approach if you want to be safe. Replacing the current one should work as well, too bad you got a bad one last time and you couldn’t get it to work.&nbsp;</P> Thu, 16 Dec 2021 17:15:05 GMT laurentbourg 2021-12-16T17:15:05Z C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/48382#M10600 <P>I have an existing thermostat running on two wires with batteries and I want to replace it with a nest thermostat that requires a C wire. I do have a third wire available to me I just need to know where to hook it up on the TACO Box</P> Sun, 21 Nov 2021 17:58:27 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/48382#M10600 BrokenOldBottle 2021-11-21T17:58:27Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/48556#M10654 <P>There is a C connection hub, typically located on the left hand side of your Taco, it might also say 24V. What is the exact model of your Taco control module?</P> Mon, 22 Nov 2021 05:39:27 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/48556#M10654 laurentbourg 2021-11-22T05:39:27Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/48637#M10675 <P>Thank you I'll pull the cover off and check which model I have but I think that answers my question</P> Mon, 22 Nov 2021 13:22:05 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/48637#M10675 BrokenOldBottle 2021-11-22T13:22:05Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/57634#M12835 <P>I have an older system two wire. I have no circuit board. Has Honeywell RA832A with (3) zone valves. transformer on top of 832. I have extra wires not being used in my thermostat&nbsp; &amp; was planning on using one of the for my "C" wire. Just not sure where to connect on furnace side? wasn't sure if i should hook to transformer&nbsp;</P> Mon, 06 Dec 2021 17:17:32 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/57634#M12835 Thekideo 2021-12-06T17:17:32Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/57690#M12851 <P>Please upload pictures of your setup</P> Mon, 06 Dec 2021 17:44:52 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/57690#M12851 laurentbourg 2021-12-06T17:44:52Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58085#M12935 <P>Looks like a mess but it's a pretty straightforward mess.lol bear with me I'm trying to figure out how to upload my pictures</P> Mon, 06 Dec 2021 23:06:46 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58085#M12935 Thekideo 2021-12-06T23:06:46Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58091#M12938 <P>you just click on the picture icon available in the textbox when you reply</P> Mon, 06 Dec 2021 23:08:49 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58091#M12938 laurentbourg 2021-12-06T23:08:49Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58095#M12940 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211206_225839471.jpg" style="width: 3024px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3003i9E205EA421783E3F/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211206_225839471.jpg" alt="PXL_20211206_225839471.jpg" /></span></P><P> </P> Mon, 06 Dec 2021 23:10:35 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58095#M12940 Thekideo 2021-12-06T23:10:35Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58098#M12941 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211206_225805529.jpg" style="width: 3024px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3004iC37C6506836A826C/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211206_225805529.jpg" alt="PXL_20211206_225805529.jpg" /></span></P><P> </P> Mon, 06 Dec 2021 23:10:58 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58098#M12941 Thekideo 2021-12-06T23:10:58Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58101#M12942 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211206_225812447.jpg" style="width: 3024px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3005i3BCE318546AE28F6/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211206_225812447.jpg" alt="PXL_20211206_225812447.jpg" /></span></P><P> </P> Mon, 06 Dec 2021 23:11:24 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58101#M12942 Thekideo 2021-12-06T23:11:24Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58112#M12948 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211206_225805529.jpg" style="width: 3024px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3007iE8C12C32DD1EE45B/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211206_225805529.jpg" alt="PXL_20211206_225805529.jpg" /></span></P><P> </P> Mon, 06 Dec 2021 23:15:52 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58112#M12948 Thekideo 2021-12-06T23:15:52Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58115#M12950 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211206_225812447.jpg" style="width: 3024px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3008iD01CD4F216C23917/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211206_225812447.jpg" alt="PXL_20211206_225812447.jpg" /></span></P><P> </P> Mon, 06 Dec 2021 23:16:42 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58115#M12950 Thekideo 2021-12-06T23:16:42Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58117#M12952 <P>I called TACO in Rhode island and Steve in Tech Support walked me right thru it.</P> Mon, 06 Dec 2021 23:17:07 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58117#M12952 BrokenOldBottle 2021-12-06T23:17:07Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58124#M12954 <P>I have reviewed your pics, and confirmed you should be able to tap the C wire on your 24v &nbsp;transformer that is on top of your RA832 controller, connect it where the white wire is connected.&nbsp;</P> Mon, 06 Dec 2021 23:19:24 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58124#M12954 laurentbourg 2021-12-06T23:19:24Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58127#M12955 <P>Hopefully my pictures went through. When I take the cover off the junction box it looks like all the whites are twisted together. I had an extra wire behind my thermostat not being used I was going to make that my c wire. Just wasn't sure where to do the hook up by the furnace</P> Mon, 06 Dec 2021 23:20:57 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58127#M12955 Thekideo 2021-12-06T23:20:57Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58133#M12958 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211206_232220457.jpg" style="width: 3024px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3012i3C675AC1D720237E/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211206_232220457.jpg" alt="PXL_20211206_232220457.jpg" /></span></P><P> </P> Mon, 06 Dec 2021 23:23:05 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58133#M12958 Thekideo 2021-12-06T23:23:05Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58137#M12960 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="PXL_20211206_232229582.jpg" style="width: 3024px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3013iB464A50810D373DA/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="PXL_20211206_232229582.jpg" alt="PXL_20211206_232229582.jpg" /></span></P><P> </P> Mon, 06 Dec 2021 23:23:38 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58137#M12960 Thekideo 2021-12-06T23:23:38Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58151#M12965 <P>Connected directly to the white wire on the transformer or follow the white wire off the transformer</P> Mon, 06 Dec 2021 23:27:37 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58151#M12965 Thekideo 2021-12-06T23:27:37Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58166#M12968 <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="1638833732845356965659236681161.jpg" style="width: 4032px;"><img src="https://www.googlenestcommunity.com/t5/image/serverpage/image-id/3014i0F2097FB3F16FC68/image-size/medium/is-moderation-mode/true?v=v2&amp;px=400" role="button" title="1638833732845356965659236681161.jpg" alt="1638833732845356965659236681161.jpg" /></span></P><P> this comes off the transformer I have 19 volts here but I have 24 across the transformer</P> Mon, 06 Dec 2021 23:36:07 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58166#M12968 Thekideo 2021-12-06T23:36:07Z Re: C wire hook up on the TACO box https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58167#M12969 <P>connected directly to the white wire on the transformer. It is a 24V transformer, correct?</P> Mon, 06 Dec 2021 23:36:07 GMT https://www.googlenestcommunity.com/t5/Nest-Thermostats/C-wire-hook-up-on-the-TACO-box/m-p/58167#M12969 laurentbourg 2021-12-06T23:36:07Z