Installing a fan speed switch on an evaporative swamp cooler has a lot of benefits. The fan speed switch will allow you to prime your swamp cooler pads or media. Before the blower motor comes on that will help prevent a lot of dust and foreign particles from getting into your space. It will also allow you to run just a fan on your evaporative swamp cooler. That will also help you to cool off your space. If the temperature outside is cooler than the inside of your space. Letting you run the swamp cooler without running the water pump saves money.
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Installing a fan speed switch on an evaporative swamp cooler is not a complicated project. If you have some basic electrical experience. However, if you are not comfortable with working with electricity. You might want to have a friend help who has knowledge or contact an electrician. All work performed should be two local code standards.
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The process of installing a fan speed switch will be very similar for all makes and models of evaporative coolers.
You will need to disconnect the wiring that is presently connected to your evaporative swamp cooler. To rewire it for a fan speed switch.
Listed below are some standards of how evaporative swamp cooler blower motors are wired.
Black is generally the high speed for the blower motor.
Red is generally the low speed for the blower motor.
White is your common wire for the blower motor.
Green is your ground wire or a bare copper wire for your blower motor.
Listed below is the standard for swamp cooler pump wiring.
Black is the hot wire for your swamp cooler pump.
White is your common wire for the swamp cooler pump.
Green is the ground wire for your swamp cooler pump.
The incoming power for your swamp cooler.
Black is your hot wire.
White is your common wire.
Green is your ground wire or a bare copper wire.
Listed below is the backside of the fan speed switch. The green arrows labeled where the wires go.
One connecting the wires to the fan speed switch. Use crimp-on connectors shown below.
The picture below shows wiring that is sloppy. And it is a fire hazard this shows why you need to use crimp on connectors.
Below is a diagram of how to wire your evaporative cooler to a fan speed switch.
Mount your fan speed switch in an electrical box.
Always keep this in mind when doing any electrical wiring. The quality of the work is most important. Always make sure all of your wiring connections are tight. Any loose wiring can cause the wires to burn and overheat and possibly catch fire.