Which controller for this unit have you tried reversing? From the looks of it, this unit is compatible with the VT4W (3 wire), VT6W (2 wire), VT7W (4 wire), and VT8W (4 wire). http://www.broan.com/common/productDigitalAssethandler.ashx?id=5942bf5e-9974-43f0-931f-ff778c55cef7
Have you tried to...
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