Polarity Reversing Switch

Home / the12volt's Install Bay / General Discussion / Polarity Reversing Switch

Welcome Guest :)

Members

< Prev Page Next Page > < Prev Topic Next Topic >

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: March 14, 2018 at 10:42 PM / IP Logged

yacob454 wrote:

Thank you guys very much! I'm gonna give both a shot this weekend!

Why bother with the 1 switch, 3 relay, and 2 diode solution when you can do it with a single switch and a $3 rectifier?

yacob454

Member - Posts: 18

Joined: November 01, 2017

Location: Tennessee, United States

Posted: March 14, 2018 at 11:34 PM / IP Logged

I agree. If your solution works (not doubting that is will), it will be the permanent solution

Hello

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: March 15, 2018 at 8:40 AM / IP Logged

An even simpler solution is a 3 position (ON-OFF-ON) 3pole double throw (3PDT) switch if you can find one locally (or on eBay).

You just use the third set of contacts to apply power to the fan (outer terminals to +12V and center to fan+).

Polarity Reversing Switch - Page 2 -- posted image.

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 16, 2018 at 10:58 AM / IP Logged

Do we know what kind of current this device draws? Why would he need a rectifier?

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: March 16, 2018 at 2:29 PM / IP Logged

Typically they draw 5A cooling and 10A in heating mode.

The fan won't run (or it will be destroyed) if the polarity is reversed.

A rectifier will provide the correct polarity regardless of the TEM polarity.

yacob454

Member - Posts: 18

Joined: November 01, 2017

Location: Tennessee, United States

Posted: March 16, 2018 at 2:42 PM / IP Logged

They do draw low amps.

EGURU, is the rectifier required if I use your DPDT switch and relay setup to run the fan the proper polarity in both switch positions?

Hello

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: March 16, 2018 at 5:26 PM / IP Logged

Apply power to both of the outside terminals of that pole of the switch. Connect the fan to the center connection of that pole. Fan will turn on with the switch in either position.

eguru

Copper - Posts: 340

Joined: February 04, 2018

Location: Quebec, Canada

Posted: March 16, 2018 at 9:49 PM / IP Logged

yacob454 wrote:

They do draw low amps.

EGURU, is the rectifier required if I use your DPDT switch and relay setup to run the fan the proper polarity in both switch positions?

If you use the DPDT switch with the relay, you do not need the rectifier.

yacob454

Member - Posts: 18

Joined: November 01, 2017

Location: Tennessee, United States

Posted: March 16, 2018 at 11:02 PM / IP Logged

Awesome. I asked because I already had those two parts

Hello

yacob454

Member - Posts: 18

Joined: November 01, 2017

Location: Tennessee, United States

Posted: March 18, 2018 at 2:24 AM / IP Logged

I used your single dpdt switch and relay combo and it worked like a champ!! Thanks again for everyone's help!

Hello

< Prev Page Next Page >

Printable version

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Search the12volt.com

Follow the12volt.com

Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.