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    jimmers's Avatar
    jimmers Posts: 2, Reputation: 1
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    #1

    May 23, 2010, 12:11 PM
    Need help Lennox 28G9801 - 3AAB83D38C1 thermostat to Honeywell RTH7400 Series.
    Lennox heat pump old wiring - A, X, M, L, F, R, M2, E, a Red & Green wire with no label & a terminal labeled E with nothing attached.

    Honeywell RTH7400 wiring - C, G, Y, O/B, RC, R on the left side & AUX, E, L on the right side. This is labeled "HEAT PUMP"

    Where do I put the Lennox wires on the Honeywell RTH7400??
    jimmers's Avatar
    jimmers Posts: 2, Reputation: 1
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    #2

    May 23, 2010, 01:03 PM
    Mistake on the Old Lennox thermostat labels...

    It is labeled - A, VR, X, M, L, F, R, M2, E and a terminal with no label with a red and green wire attached. The E terminal has nothing attached to it.

    Apologize for the error.
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