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Novice here and changing a thermostat. Have a Carrier FA4ANF048 system. Changing from an old circular thermostat to a Honeywell RTH7500. First, is this a heat pump system? Wiring is attached differently if it is and (we're renting) not sure if this Carrier system is a heat pump system. Most web material makes me think it is.

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  • Danny Clark
    Danny Clark May 11, 2010

    What color wires were on the old thermostat, and what terminals were they attatched to?

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Return t-stat for another with o/b terminals

Posted on Jan 21, 2009

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