3-Switch swamp cooler wiring

Old 09-06-22, 02:29 PM
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3-Switch swamp cooler wiring

I have a two-speed motor on my swamp cooler. It, and the pump, are controlled by three switches in my hall closet. One switch controls the pump (works fine). One switch powers the fan (works fine). One switch toggles the fan from low to high speed - this switch doesn't work. It turns the fan off instead of changing it to low speed (fan always runs on high speed or not at all right now). I recently replaced all the switches because they were very old and one of them simply gave out, but I put the wires on the new switches in the exact places as they were originally (when it worked). Is there a special type of switch that toggles instead of cutting off current (it just has a regular old light switch on it)?

While I'm obviously no pro, I've done a lot of DIY wiring and never had a conundrum like this. I've got the idea that there coming in there is a neutral/white and a hot/black and going out there is a neutral/white, hot/black for the pump, high/black for the fan, and low/red for the fan. Does anyone have a wiring diagram for this situation?
Old 09-06-22, 04:00 PM
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Welcome to the forums.

The first switch is for pump power and is a regular single pole switch.
The second switch is for the fan power and is a regular single pole switch.
The third switch is for high/low and is a regular three way switch.
Power is fed in on the dark screw terminal and out on the other two brass terminals.
After wiring... if fan speed works in reverse.... flip the switch over.

Old 09-06-22, 04:20 PM
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The switch for the low or high speed of the fan motor requires a single pole double throw 3 terminal arrangement (common, closed, open). This switch must have current and voltage ratings equal or greater than those on the motor. Switched line voltage from the motor on/off switch connects to the common terminal, low speed motor wire to the closed terminal and high speed motor wire to the open terminal. None of your switches should involve the neutral wire. I didn't refer to your wire colors as I was not sure what you meant when you stated "I got the idea ....".
Old 09-12-22, 02:53 PM
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Thanks for these responses!! They've answered my questions and all I have to do now is implement the answers. I'll probably do it next weekend. If so, I'll post some pics!
Thanks again.

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