Bigben2k:
All I had was the engineering notes for their current fans. My guess’ on the function of the leads worked out great.
It turns out that not all the info there is valid for my fan as wizard115 pointed out. He found that a reho bus would continuously vary the speed by varying the voltage from 7 to 12 on my old model number fan. But the engineering notes say it does not work way.
What does that mean? You just have to experiment around to find out what works. I do not have a reho bus that will handle that many watts. But my 2$US pot on the controller lead sure beat the price of a reho bus.
The only way to find out is to buy one. cost for your blower is only 6$US plus shipping, not bad at all. Using the tach output may give the info you need (lower amps, lower rpm = lower cfm?). Have fun experimenting with it.
Ops I see murray13 came in with some better info. Good luck
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Have fun, FuzzyFace
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