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Wiring question

Howard50
Community Member

Hello,

I live in a building with 60 apartments.  There is one common heating furnace. Ther is no cooling, heat only.  Heating is forced hot water baseboard radiator.  There is a valve on the hot water pipe.  There are only two wires at the thermostat.  When needed the thermostat closes (shorts) the two wires which open the valve and the hot water circulates (forced) through the baseboard radiators.

I installed the Nest Thermostat Model G4CVZ, SKU: GA02081-US.  A C-wire can not be added and the furnace logic board is not available, a common furnace for 60 apartments.  I am left with adding a seperate 24V AC C-Wire Transformer,  All digrams I find show the Nest thermostat mounting plate with 7 connections.

They are RC, RH, O/B, Y, G, W/E. C.

My mounting plate has 6 connectors.  They are Y, C, W, G, R, *OB.

If I take the two exsisting wires and put RED to R and WHITE to W, where would I put the two wires from the transformer?

I also see different transformers offered online, 12VAC 500mA, 24VAC 300mA, and 24VAC 410mA.  What is the current requirement of the Nest Thermostat?

THats a lot of info.  Any Advise is appreciated.  Thanks, Howard50

3 REPLIES 3

Jake
Community Specialist
Community Specialist

Hey Howard50,

 

Apologies for the late reply. I wanted to follow up and ensure you are good to go. Wiring can be confusing at times. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further. 

Best regards,
Jake

Jake
Community Specialist
Community Specialist

Hey Howard50,

 

I want to ensure you are good to go, and everything is working properly. Please let me know if you are still having trouble, as I will be locking the thread in 24 hours due to inactivity. 

Best regards,
Jake

Jake
Community Specialist
Community Specialist

Hey Howard50,

 

It has been a few days since the last reply, and I am going to lock the thread at this time. If you have any questions, please feel free to create a new post. 

Best regards,
Jake