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    3. How do I hook up my Honeywell #RTH221B1021 thermostat
    How do I hook up my Honeywell #RTH221B1021 thermostat

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    0  Views: 692 Answers: 1 Posted: 12 years ago
    Tags: honeywell thermostats
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      1 Answer

      Run a low voltage, 2 strand wire, from the 12V transformer in the controller box to the two screws on the thermostat, WBMS


      12 years ago. Rating: 1
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