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Fan problem: need help understanding what is wrong
Posted 26 June 2004 - 01:34 AM
Posted 26 June 2004 - 06:27 AM
You need a relay in which the contacts are open until the coil is energized. If you've bought a relay from an electronics store, you may simply have used the wrong pair of contacts -- most electronics relays are double-throw.
Why don't you just wire the two fans in parallel, and forget the second relay? I think you'll find that the first fan is already being run through a relay, and that the relay should be able to take the load of the second fan. If your fan fuse blows when things are wired this way, you'll need to add the second relay with its own supply and fuse. Don't install a bigger fuse.
When you use a second relay, run the two coil wires to the first fan so that the relay will turn on and off at the same time as the first fan. Don't try to control the relay directly from the thermoswitch.
Posted 26 June 2004 - 09:40 AM
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