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Old 10-21-2013, 10:55 AM  
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Default Connecting booster fan to blower motor

I would like to connect booster fan to the blower motor in my furnace. The blower motor has 5 wires going to it:
- Neutral
And 4 others:
- Cool-H
- Heat-H
- Park
- Park

The booster fan is 120VAC and I wonder which wires is it best to connect to?
They all get voltage when the the blower turns on.
Should I use relay or direct connection will be better?
The furnace is Trane XR90.

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Old 10-22-2013, 04:43 PM  
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Hook it up to the relay controlling the blower
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