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I recently purchased a Honeywell RTH2520 thermostat. Our old mercury thermostat only has 2 wires, red and white or red and black. The new thermo has terminals Rh Rc W Y and G, with a red jumper in between Rh and Rc. Where do I connect the wires to? Do I have to take out the red jumper? Or leave it in while connecting to Rh and W...we have no AC

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Use the RH & W terminals. You cannot connect it backwards so it's a breeze.

Posted on Sep 14, 2011

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