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How do i uninstall my old honeywell mercury thermostat

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There are three parts to a T87F thermostat. Outer ring, thermostat body, and base mount. Remove the snap on ring that goes around the dial. Remove three screws from the thermostat that mount it to its base. Remove the thermostat. Disconnect and record what screws each wire attaches to. Remove the screws holding the base to the wall.

Posted on Jul 12, 2008

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Posted on Jan 02, 2017

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on the honeywell 8000 use the heat pump labeling and then the standard wiring would be
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Y- yellow
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There should not be a bare wire, it probably just has the insulation stripped back way too far.
You should probably open the furnace and compare the terminal label in the furnace to the wire color. normally yellow and blue pass through the furnace and are wire nutted to wires going to the outdoor unit. In the furnace the white wire will connect to the w or w1 terminal. also, you will need to set the Honeywell stat to have the following parameters.
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