Help with wiring whole house fan control

Old 07-06-14, 06:53 PM
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Help with wiring whole house fan control


I am a new homeowner, and I have a whole house fan installed.

The current timer switch is not working well, and I would like to replace the entire unit.

It currently is setup as follows: Two switches, a knob on the left which controls the fan speed: Off, low or high. There is then a manual egg-timer-like power knob on the right.

I see the following wires connected to the speed control knob:

1: Red, connected to the house red
2. Black, connected to the house black
3. Brown, connected to the timer-switch
4. Blue, connected to a different house black.

I also have neutral white wires and bare copper grounds buried in the box

Please see the following images:

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I was hoping to modernize the system by using these two switches:

Lutron MA-T51MN-LA Maestro 600-Watt 3-Amp Multi-Location Digital Countdown Timer Control Switch, Light Almond - Wall Timer Switches -

Are these the correct choices? How would I wire them to the current system?

Old 07-08-14, 04:06 AM
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Stumped? Or did I ask the question poorly?
Old 07-08-14, 08:07 AM
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Line (the power in wire) goes to the timer first. Power out from the timer goes to power in on the speed control. Power out from the speed control goes to the fan.

However if the timer does not have a neutral this may not work because of the speed control.

No horsepower rating on either the timer or the speed control so can't say how long they will last. Do not know if the speed control will work with the type of motor on your whole house fan.

Last edited by ray2047; 07-08-14 at 08:23 AM.

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