I have a 4-wire system, but t-stat requires me to guess whether the weather is going to be too hot or too cold because I have to choose heat or cool mode via a switch. It won't do both at once. Living in the South, on pretty much any day of the year, the weather can require heat in the morning, the AC in the afternoons and heat again at night. I want to rewire my t-stat so that I can bypass the selector switch and just have the relay activate the system in either heat or cool mode, depending on the temperature setting and whether the ambient is higher or lower. It already performs those decisions, it just performs them in two separate modes. It looks like the board was built to house several models of t-stat because there are several empty and hard-wired-closed component slots, and I assume that at least one of those configurations is a heat/cool auto-sense model. I just need the schematics for both the model I have and the model I want, and I can do the rest. Can anyone help me with either of those?
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Bryan