I am trying to replace an old t-stat with a new Ranco ETC-111000-000. The old t-stats have no idea what they are they are old and rust can't read. The old ones are hooked up with only two wires, (where i used to work and bought these from we used 4 wires so im lost)
The old one has a red, yellow, and blue dot on them. Yellow is on top, blue middle and red bottom which is common. I have a Blue wire hooked up to common and a orange wire goint to yellow dot(?) on my new t-stat where do i put the orange wire at? I know blue will go to com.
Thanks
Brenda
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