Thermador downdraft to an external fan

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Old 05-28-14, 06:33 AM
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Thermador downdraft to an external fan

Hi,

I have a new Thermador downdraft with a 5 wire wiring harness. The wires are for high, medium, low, neutral, and ground. (I believe!) The external fan has only three wires hot, neutral, and ground. What do I need in between these two sets of wires to have my Thermador downdraft control my external fan?

Thanks for any insight!
 
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Old 05-28-14, 08:40 AM
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Use the high speed wire, neutral and ground. Cap off medium and low speed wires.

Your fan is only a single speed model.
 
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Old 05-28-14, 11:29 AM
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Well we replaced a Thermador cooktop and downdraft that was 20 years old. I had the ability to select a fan speed of high, medium, or low with that setup. The external fan is the same one, so I expected to be able to continue to run it at high medium or low. Will that still be possible?
 
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Old 05-28-14, 11:33 AM
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If there were only three wires with your old cooktop then there was an electronic speed control built into the unit.
Your new unit isn't going to supply three speeds without a three speed motor.
 
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