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    Aug 16, 2012, 07:21 AM
    Lennox heat pump thermostat wiring diagram
    I'm installing a new Honeywell programmable thermostat RTH7500D in place off old 1997 lennox thermostat. The wires on the lennox heat pump side are marked top to bottom 1, 2, 3. The honeywell heat pump side is marked aux, e, l. how do I hook the wires up? The other wires march up.
    Thanks
    Old retired lady

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