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I have a intertherm furnace M1MB077ABW I am trying to find a wiring diagram to show the hookup for the A/C as there is no Y terminal on the board, Do I just run a wire from my thermostat to the condenser and back to C on the board, and does this bring my fan to high speed?

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  • riyoung May 01, 2008

    Thank you ,I understand about the fan center, the furnace that was sold to my friend is A/C ready and is suppose to have the relay built into the control board, I think that I can just run my wire from Y on the stat to the condenser then back to common on the board, the switching will be done in the stat through G bring the fan on.What do you think?



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You may find that you must install a fan control center. This has a transformer & relay for bringing on the fan for the cooling mode and will also have all the necessary terminals for your connections. Your stand alone furnace will more than likely need a higher VA transformer which is part of the fan control center.

Posted on May 01, 2008

  • James Helmer
    James Helmer May 01, 2008

    Do that and you have it right.



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