Omnistat with 2 transformers?

Frunple

Active Member
Hello,
I'm trying to replace an existing tstat with a omnistat rc80b. The existing has seperate connections for heat and cool (Rh and Rc). The omnistat instructions say to add a relay to the W wire on the coil side and the transformer connects to the NO and C. My first question is, if I put the relay down with the furnace, and I run the W to one side of the coil, do I run the other side of the coil back up to the C of the omnistat?
Second, connected this way does that mean the heat will now use the 24v from the A/C transformer? If so, is that ok?

Thanks for any info!
 
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