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Again, thanks for the prompt reply!
After your advise about not using a rheostat to control the booster fan speed, I went to remove it and discovered that it is actually a fan speed controller made by Leviton {6616-1XL). After checking the spec sheet it seems to be OK for the application but I would appreciate your input.
BTW, do you expect that the cleaning of the centrifugal contacts will help with the starting or the stopping problem?
What I thought was the plenum stat looks to be an overtemperature sensor in the heat exchanger as the gas supply is cut off when it is disconnected. I will have to look elsewhere for the plenum stat.
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