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Wiring Schematic Needed

12571
Community Member

I have an existing Hot Water Baseboard Heating System with 2 Zones, 1 upstairs and 1 Downstairs. I also have a Sidearm Hot Water Heater controlled by an Aquastat. The Boiler is controlled with a Honeywell L8184A Triple Aquastat. I am installing Central Air Upstairs to be controlled with a new Nest Learning T'stat and running a New 5 Strand T'stat wire from it to the A/C and the Boiler Control. (no problem just fyi). I am installing a new Nest T'stat Downstairs (heating only) which Will Require a Nest Power Supply. All current T'stat wires (both Zones and the Water Heater Aquastat) are currently tied together and wired with a single strand T'stat wire to the Red and White TT Terminals on the Controller. Being that the new Nest Learning T'stat (upstairs) will have a C wire and the Downstairs Nest T'stat will need the Nest Power Supply. Where should the Power Supply be installed so that it will work in conjunction with the upstairs. L8124A.jpgL8124A.jpgairs  Nest Learning T'stat, function properly, and not interfere while supplying the necessary Power to the  Nest T'stat (Downstairs) and the Aquastat the controls the Water Heater. A simple Wiring Schematic would be all I need.  Please and Thank You !!!

1 Recommended Answer

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

You need to add a relay to the two T terminals in order to use any of the Nest thermostats a. You can wire it something like this.

 

Boiler wiring.jpg


To ensure that I see your reply, please tag me using @Patrick_Caezza

View Recommended Answer in original post

4 REPLIES 4

Patrick_Caezza
Platinum Product Expert
Platinum Product Expert

You need to add a relay to the two T terminals in order to use any of the Nest thermostats a. You can wire it something like this.

 

Boiler wiring.jpg


To ensure that I see your reply, please tag me using @Patrick_Caezza

That made it Very Clear, Thank you. 

MelbaDT
Community Specialist
Community Specialist

Hi, 

 

I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community.

 

Best, 

Melba

MelbaDT
Community Specialist
Community Specialist

Hey folks, 

 

Thanks for answering and for the very informative diagram, Patrick_Caezza. 

 

@12571, I'm just dropping by to ensure everything is covered here. Feel free to reach out again if you have more questions. 

 

Best, 

Melba