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Hooking up a nest power connector to triple aquastat
snackman1973
Member Posts: 1
Tried many different combinations, after reading the C wire was common and needed to be grounded, I attached to the side of the box. Still doesn't function. The 2 thermostat wires coming out of the unit are green and white(pretty sure whoever hooked it up originally just used the green instead of the red bc the red isn't connected to anything up at the weird junction box that I've never seen before. Hopefully someone has seen something similar in their travels
It's an oil burning system with baseboard heat
It's an oil burning system with baseboard heat
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Comments
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Hello @snackman1973,
Bonding the C wire to the equipment ground is kind of irrelevant for proper operation. The external transformer size may have to be increased to handle the extra load of the NEST thermostats.
Are you using the C wire adapter box thing ? If so do you actually need it ?
If not I would wire it this way.
If you wanted to clean up the wire colors a bit.
National - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System4 -
National - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System0 -
I bet @Robert O'Brien knows a way!
Can’t find his article, but an AC Ready or Kool Kit w/transformer would easily work.
Use that for your common, run 2 wires to T-T to close the aquastat switch.
Edit: Found it.
https://heatinghelp.com/systems-help-center/what-to-do-if-you-dont-have-a-c-wire-for-your-thermostat/There was an error rendering this rich post.
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If you have three wires (conductors) to the Nest, do it exactly as 109A_5 diagrammed in his first post and forget the adapter. You will need an aux transformer, 40VA-24Vac.
The connections from the Taco zone valves to the aquastat is the same as before the Nests were installed.0 -
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