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kangaboy
Samba Member
Joined: August 28, 2010
Posts: 1063
Location: St. Louis, Mo
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 Posted: Thu May 10, 2018 8:51 am Post subject: DPDT Toggle Switch wiring for two fans |
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So back story is this is a industrial hair dryer for a dog grooming setup, and its just two hefty fans hooked to a 120v socket via a dual pole dual throw toggle switch. The wiring shorted out and burn the switch, along with the wire leads, so I couldn't just buy a switch and replace it. Had to cut new leads and the like. The dryer has two motors in it, and a "hi" and "low" setting with flipping the switch up or down. I figured one motor running would be low, and two motors running would be high (I may be completely wrong on this...maybe the fans are given different voltages somehow).
This is the drawing that I came up with to give one fan power with the switch down, and two fans power with the switch up. Does this make sense? I tried it last night and it didn't seem to work...but I feel like its wired correctly.
Thoughts?
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-74 Standard - "CaliBug" 2084T, MS3X w/FI and Crank Fire
-76 Westy - "Gandalf"
-18 GTI SE
| skills@eurocarsplus wrote: |
that fucking thing looks like it drove through a J.C. Whitney catalogue and hit everything on the way out  |
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mukluk
Samba Member
Joined: October 18, 2012
Posts: 7023
Location: Clyde, TX
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| Posted: Thu May 10, 2018 12:12 pm Post subject: Re: DPDT Toggle Switch wiring for two fans |
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It would have been wise to see how the old switch was wired prior to cutting the wires off, doing so would have given you a guide as to how to wire the new switch as well as tell you how the circuit was intended to function.
Hindsight is always 20/20. 
Couple things you may want to consider:
- Is the new switch rated sufficiently for the load?
- Were the fans damaged when the wiring shorted, ie, do they even still work?
- What caused the previous wiring short and has it been corrected?
- Have you verified the remaining wires you are using are not also damaged?
Insomuch that you tried it last night and it didn't seem to work, please describe exactly what it is doing.
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kangaboy
Samba Member
Joined: August 28, 2010
Posts: 1063
Location: St. Louis, Mo
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| Posted: Thu May 10, 2018 12:25 pm Post subject: Re: DPDT Toggle Switch wiring for two fans |
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| kangaboy wrote: |
| The wiring shorted out and burn the switch, along with the wire leads, so I couldn't just buy a switch and replace it. Had to cut new leads and the like. |
Yeah, I would have totally done that. One side was slightly intact, but I thought I would be able to figure it out. Guess not.
So I can confirm that both of the fans are working. Also, the wiring to the fans and from the socket are good. The only issue was a short at the switch. I don't know if a little water got in there gradually over time, or if the switch failed, or if something broke on the inside of the switch. The new switch I bought is rated for more load than the previous one, so we should be good there. I guess I'm just going to wire it up in a way that doesn't cause any shorts and see what I can make happen. The more I think about it, the more I think I wired it correctly and just had the intake port covered up so it made it seem like the fans were blowing backwards.
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-74 Standard - "CaliBug" 2084T, MS3X w/FI and Crank Fire
-76 Westy - "Gandalf"
-18 GTI SE
| skills@eurocarsplus wrote: |
that fucking thing looks like it drove through a J.C. Whitney catalogue and hit everything on the way out |
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kangaboy
Samba Member
Joined: August 28, 2010
Posts: 1063
Location: St. Louis, Mo
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| Posted: Thu May 10, 2018 12:44 pm Post subject: Re: DPDT Toggle Switch wiring for two fans |
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Here is my seconds attempt. Took out the neutral side of things and run them directly to the fan, and just toggle power.
_________________
-74 Standard - "CaliBug" 2084T, MS3X w/FI and Crank Fire
-76 Westy - "Gandalf"
-18 GTI SE
| skills@eurocarsplus wrote: |
that fucking thing looks like it drove through a J.C. Whitney catalogue and hit everything on the way out |
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cbeck
Samba Member
Joined: January 14, 2014
Posts: 2495
Location: high ridge, mo
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| Posted: Thu May 10, 2018 3:06 pm Post subject: Re: DPDT Toggle Switch wiring for two fans |
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My first thought was- there is a groomer around the corner? My second thought was-is there a seperate on/off switch with second attempt? Looks like you nailed hi@low?
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www.thesamba.com/vw/forum/viewtopic.php?t=647779 |
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mukluk
Samba Member
Joined: October 18, 2012
Posts: 7023
Location: Clyde, TX
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| Posted: Thu May 10, 2018 3:22 pm Post subject: Re: DPDT Toggle Switch wiring for two fans |
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| kangaboy wrote: |
Here is my seconds attempt. Took out the neutral side of things and run them directly to the fan, and just toggle power.
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That should work, but you're putting the full load of both fans through the 4/2 contacts which will cause them to burn out sooner. I think you'd be better off with power coming into 3 and 4, connect 1 to fan 1 power input, connect 2 to fan 2 power input, and jumper 2 to 6. That'll spread the electrical load evenly across the contacts.
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kangaboy
Samba Member
Joined: August 28, 2010
Posts: 1063
Location: St. Louis, Mo
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| Posted: Fri May 11, 2018 12:37 pm Post subject: Re: DPDT Toggle Switch wiring for two fans |
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| cbeck wrote: |
| My first thought was- there is a groomer around the corner? |
Yep. High Ridge Animal Hospital does grooming and boarding. Bring the dogs/cats up for a spa day sometime! 
_________________
-74 Standard - "CaliBug" 2084T, MS3X w/FI and Crank Fire
-76 Westy - "Gandalf"
-18 GTI SE
| skills@eurocarsplus wrote: |
that fucking thing looks like it drove through a J.C. Whitney catalogue and hit everything on the way out |
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Fusillade
Samba Member
Joined: April 24, 2003
Posts: 399
Location: Abilene, TX
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| Posted: Fri May 11, 2018 5:37 pm Post subject: Re: DPDT Toggle Switch wiring for two fans |
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Try not to overthink it.
You want one fan on low, two fans on high with a DPDT switch?
If the switch is an ON-OFF-ON switch, when the switch is in the middle position, now power flows and both fans are off.
Tie pins 3 and 4 together to 120V hot.
Tie pins 1 and 5 together to leg one of the low fan.
Tie pin 6 to leg one of the high fan.
Tie legs 2 of the low fan and high fan to 120V neutral.
When the switch is down:
pin 3 is connected to pin 1
pin 4 is connected to pin 2
power reaches the low fan
When the switch is up:
pin 3 is connected to pin 5
pin 4 is connected to pin 6
power reaches the low fan and the high fan
In this configuration, an equal amount of power flows through all contacts and the switch will wear normally.
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