Those fans don’t work like a pool pump/filter, which has two separate loads which can be switched independently. There’s a third line in to an ECM modulator.
There was a discussion about this last month:
Hi, I am looking to install two QuietCool three speed whole house fans. They are super quiet and energy efficient but their timer and speed switch setup leaves some things to be desired. The fan has a constant power source but the 120v hot leg is then wired to a push button 8 hour timer that feeds a dual switch setup to select low, medium or high speed. The two speed switches are chained together so the output to the fan is over 3 hot wires, one for each speed. I was trying to thing of a way to replace this setup with something that could work with ST. Any thoughts on how I could have a device that could power only one of three power legs at a time? Thanks
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