Thermostatic control and fan using relays

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=45663
Printed Date: July 07, 2025 at 11:17 AM

Topic: Thermostatic control and fan using relays

Posted By: illicon2003
Subject: Thermostatic control and fan using relays
Date Posted: December 21, 2004 at 12:24 AM

Ok how's it going I've done research but can't seem to get to the bottom. I need help designing a wire diagram to control 1 or 2 fans, using standard 5 spade SPST relays, or a couple of these honda relays. See diagram below. I'll be using a 2 wire thermoswitch. I appreciate the help. I know a 30amp fuse must be used

posted_image

Replies:

Posted By: hotwaterwizard
Date Posted: December 30, 2004 at 12:54 AM

How about this one I drew for you. posted_image

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: illicon2003
Date Posted: January 12, 2005 at 6:57 PM

hotwaterwizard wrote:

How about this one I drew for you.

Hey man thanks alot ! I really appreciate the time. One question though, is that a normally open or closed thermoswitch? Thanks!

Posted By: hotwaterwizard
Date Posted: January 12, 2005 at 8:00 PM

Depends on the Application. I use it to control a Fuel solenoid.

That application is Norm Closed.

For Cooling you need Normally Open so the fan turns on when it reaches the High Limit you set.

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

Posted By: illicon2003
Date Posted: January 12, 2005 at 8:38 PM

How does that look, w/ the exception of the artwork?

Posted By: hotwaterwizard
Date Posted: January 13, 2005 at 8:47 AM

That will do it!

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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !

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