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[Joks79]

I want to add a three way zone valve to bypass my heat exchanger in my forced air system so it only flows hot water when needed. My house gets too warm when it is warm outside.  I currently have a aquastat wired in and want to keep it. How can I wire in a zone valve and keep my aquastat and my current thermostat? Would I also have to add a timer to allow the heat exchanger heat up before the fan kicks in?

[RSI]

Have you decided on what valve you will use yet? The wiring will depend on the type of valve you use.

If the transformer in your furnace can handle the extra current of the zone valve, you could just wire it to run off that. Otherwise you will need to add a transformer. I would also add a relay too if you do that. It is possible to connect without a relay but if you wire it wrong you could damage the transformers and other parts in the furnace. Using a fan center or switching relay would get you both the transformer and relay in a single unit. I would go with a fan center since they usually have a larger transformer.

[Joks79]

I have a Taco valve to use. I checked my C terminal in my furnace too and I didn't have any voltage there. There are a few dip switches there. Could one of those be the reason to why there is no power?

[mlappin]

 Really good explanation of all your connections here.

http://www.electrical-online.com/thermostat-wiring-explained

[RSI]

What model is the zone valve?

[NaturallyAspirated]

Also, do you have a suitable head dump to handle the OWB's excess heat?

Neal

[Joks79]

I believe this is the valve. I purchased it locally and told the HVAC place what I wanted to do.


http://www.supplyhouse.com/Taco-562-5-1-Sweat-3-Way-Zone-Valve-5073000-p

[RSI]

It may work if you just remove the wire you have going from the aquastat to G in the furnace and run it instead from aquastat to terminal 2
Then run wire from the G in furnace to terminal 3
Then run a wire from C in the furnace to terminal 1.