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Replace a 3 way switch with a hard wired timer for pool pump

Replace a 3 way switch with a hard wired timer for pool pump

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  #1  
Old 07-19-16, 10:31 AM
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Replace a 3 way switch with a hard wired timer for pool pump

I have a pool pump in the garage that has a three way switch above it on the wall and another three way switch, for the same line, in my basement near the panel box. I can turn the pump on and off using either switch. I would like to hardwire a timer switch to control the pool pump. Can I replace the switch over the pump in the garage with a hard wired timer? What about the red wires that are involved.
 

Last edited by Jack45; 07-19-16 at 11:57 AM. Reason: Missed some words
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Old 07-19-16, 10:47 AM
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Welcome to the forums.

The first step is you need to figure out which switchbox has the power coming into it.
 
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Old 07-19-16, 12:00 PM
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The switch in the basement is the first one on the line leaving the panel box.
 
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Old 07-19-16, 12:31 PM
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The switch in the basement is the first one on the line leaving the panel box.
So you have power coming to it from the breaker box. Is that what you mean? And you have three wires going to the garage, correct? Is it an attached or detached garage? If detached does it have any other power going to it?
 
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Old 07-19-16, 08:46 PM
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Why in the world would you want a three way switching system on a pump. That is a BIG no no unless the pump can be unplugged for service.
 
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Old 07-20-16, 07:03 AM
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The pump is hard wired. Previous owners probably wanted to be able to turn it off from the house or near the pump in the garage.
 
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Old 07-20-16, 07:08 AM
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Detached garage and yes there are three wires running from the panel box in the basement, first to the three way switch in the basement then to the detached garage three way switch above the pool pump, then to the pump itself. Yes, there is another power line (3wire) running from the panel box to another switch in the basement to a pool heater in the garage
 
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Old 07-20-16, 07:12 AM
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Can I just take out the garage switch, cap off the red wire and hook the white and black to the new timer?
 
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Old 07-20-16, 08:59 AM
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I'd recommend having the timer in one location and disconnect the other switch.

The problem with the three way switching is that you could be servicing the pump and it could be turned back on from a switch you can't see.
 
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Old 07-20-16, 09:05 AM
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Yes, there is another power line (3wire)
Terminology: We don't count the ground so do you mean a 2-conductor cable?
Detached garage... Yes, there is another power line (3wire) running from the panel box to another switch in the basement to a pool heater in the garage
Then none of this is code compliant. You can have only one circuit to the garage and the switches need to be in sight of the equipment if there is no other disconnect.

You are going to have to abandon the existing cables to the garage and install a subpanel in the garage.
 
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Old 07-20-16, 05:26 PM
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I think what I will do is leave both three way switches right where they are and install the timer on the two wire line running from the garage 3 way switch to the pump itself. That seems like the easier route.
 
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Old 07-20-16, 05:41 PM
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I would put the timer on the line side (between the switch and the panel) of the first 3 way switch. That way the switches will still function normal except the timer would be the master control. Also the timer could not be turned off so it would never lose time.
 
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Old 07-20-16, 07:44 PM
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That makes sense. Would I then just wire nut the red wires together in the timer box since they would have no purpose?
 
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