"btr214" wrote in message
I have a 4-wire system, but t-stat requires me to guess whether the
going to be too hot or too cold because I have to choose heat or cool mode
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
and heat again at night. I want to rewire my t-stat so that I can bypass
selector switch and just have the relay activate the system in either heat
mode, depending on the temperature setting and whether the ambient is
lower. It already performs those decisions, it just performs them in two
modes. It looks like the board was built to house several models of
because there are several empty and hard-wired-closed component slots, and
assume that at least one of those configurations is a heat/cool auto-sense
I just need the schematics for both the model I have and the model I want,
can do the rest. Can anyone help me with either of those?
Yes. Got to Lowes and buy a new thermostat with auto-switchover.