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Old 11-01-2012, 02:54 PM   #1
tannnick
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Is it possible to hook 1 pump up to 2 sides of a 3 way switch using 1 side as manual control, 1 side as off, and the 3rd side as an auto control having a float switch control the pump? Thank you
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Old 11-01-2012, 03:17 PM   #2
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Yes. This is typically called an HOA switch (HAND-OFF-AUTO). The left position is manual (always on); the middle position is off; and the right position is auto.

It is important that you purchase the correct type 3 position switch. The exact wiring will vary depending on the specific switch you have, but the general idea is: in the HAND position you provide 120VAC to the pump; in the OFF position you provide no power to the pump; and in the AUTO position you provide the signal from the float switch to power the pump. If you have a switch that has single dry contacts for each switch position you will have to jumper one side of each of the contacts together that will then go to the pump or relay.

Make sure to purchase a switch with contacts rated for the appropriate voltage and current that will be passing through them.

I think you can probably find other posts that address this specific issue.

 
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Old 11-01-2012, 05:22 PM   #3
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I am using a basic 3 way switch. Where would I get 1 of those switches?
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Old 11-01-2012, 05:53 PM   #4
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Quote:
Originally Posted by tannnick View Post
I am using a basic 3 way switch. Where would I get 1 of those switches?
Sorry, didn't mean to confuse. A basic 3-way switch will probably work. HOA is just a way to describe what the switch is used for. Can you provide more detail on the switch you have like a part number or a picture of the terminals?

 
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Old 11-02-2012, 03:34 PM   #5
tannnick
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The switch is from auber ins. I can provide a pic later.
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Old 11-02-2012, 04:36 PM   #6
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You need a SPDT switch. I made a schematic for someone else but mislabeled the switch. I accidentally labeled it SPST....

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Old 11-02-2012, 06:42 PM   #7
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Quote:
Originally Posted by tannnick View Post
The switch is from auber ins. I can provide a pic later.
Auber Instruments - Model: SW3 - DPDT Center Off

I believe this is the switch that is the best choice to accomplish the task you are trying to accomplish:
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Old 11-03-2012, 02:49 PM   #8
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Yes that is the switch I am using
Thank you PJ.
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