Lennox to Honeywell Thermostat

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rcull

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I have a Lennox 81M26-27-28 thermostat which I would like to replace with a Honeywell RTH9580WF.
Most of the wiring is simply follow the directions. However on the left side of the Lennox thermostat there are a two wires which are not coded. Can anyone tell me what that part of the thermostat is supposed to control?
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