Clint Lovell,
This isn't Alan either, and seeing as waldo53 broke the ice, I'll shoot the breeze too.
Alan is a big fan of Mad Electrical. If you visit the site and find the dope on fan installations, you will see that the owner (Mark) recommends two relays for this install.
The relays he spec's are rated at 30 amps...more than enough for the fan. So why use two? He indicates the the motor that powers the fan, when working hard, will draw enough current to heat the connections where the relay plugs into the socket. This will eventually 'crisp' things and lead to failure, which means no cooling.
In an attempt to 'half' this load, he recommends two relays, thus sharing current draw through the suspect wires. Simple, HUH!
The relays are merely the switch to turn the fan on..dumb. The temp sensor is a totally different component. It's the brains that turn the dumb relay (relays) on.
Stuart
