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NC would be used to control cooling, i.e. it is "on" until the temperature gets down to what you want.

NO normally open, NC normally closed. Open means off, the timer then turns heating on when the timer switch or thermostat closes the...

Connect it exactly as in your right hand picture. If your wires are not red, blue and yellow, let us know what they are.

Hey folks, Found this site and registered and dropping in to say "Hello" and after some help with a heating thermostat. I bought one...