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230v Thermostat - Electronics wiz help required

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ex_directory:


--- Quote from: DaOld Man on April 08, 2008, 07:17:46 am ---Thats ok. For simplicity's sake, lets say the temp settings on the thermostat dial are between 1 and 10.
On a cooling system, lets say you want the temp to be 5, so you set the thermostat on 5.

If you turn the thermostat down to 2, then you are saying you want the temp now to be 2, so the fan comes on.
When the temp gets down to 2, the fan will cut off.

Now lets say the thermostat is placed on 5 again, and the temp is 6, so the fan is running because the temp is above the setting.
If you turn the thermostat up to 7, the thermostat now wants a temp of 7, so it turns the fan off.
The fan will stay off until the temp reaches 7. Above 7 the fan will come on again.

So you are correct about the dial reading. it is not referring to the actual temp, but what you want the temp to be.
You need a thermometer to tell you the actual temp. Also, the fan will turn on and off at around the setting, it will be a little above the set mark and a little below the set mark. This is where the hysteresis comes in, but I wouldnt worry about that.
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Thanks DaOldMan, I got it! Well almost  ;D

Tried the hair dryer (laymans) method tonight, hairdryer blowing on it, it came on, 5 mins later it turned off. There is just one thing stopping me using this now, when it turns off my speakers make a grumbling noise for about 1 sec, like an interference. Unless there is a logical explanation for this then I am not sure I can trust it (as I don't know where it came from!).

ex_directory:

Any thoughts on the speaker issue? Is this just some static thing or is the thermo shutting off not shutting off instantly, so there is some residual power while it is shutting off if you see what i mean?

Fozzy The Bear:


--- Quote from: ex_directory on April 10, 2008, 06:33:26 am ---Any thoughts on the speaker issue? Is this just some static thing or is the thermo shutting off not shutting off instantly, so there is some residual power while it is shutting off if you see what i mean?

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Why do you actually need to use this thing anyway..... If you need a fan on the case then fit a big fan run it at low speed and you'll hardly hear it.  You don't need to temp control it, just run it all the time.

Best Regards,
Julian (Fozzy The Bear)

ex_directory:


--- Quote from: Fozzy The Bear on April 10, 2008, 06:51:32 am ---Why do you actually need to use this thing anyway..... If you need a fan on the case then fit a big fan run it at low speed and you'll hardly hear it.  You don't need to temp control it, just run it all the time.
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Julian, I am thinking of using this not on my cab but in a small home made (closed) cabinet where my xbox, dvd and sky box live. The dvd never gets hot, but the xbox and sky+ box can get radioactive. Running the fan 24/7 would be a waste as it is really only an issue when the xbox is on (once a day) and sky+ is on (it generally is not turned off). Ideally a little 12v molex output from the 360 would be best (like my cab pc) but failing that, was thinking a thermo controlled thing. Asking my son to turn on a fan just won't happen!

Fozzy The Bear:


--- Quote from: ex_directory on April 10, 2008, 06:59:36 am ---Asking my son to turn on a fan just won't happen!

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There's an easy way to deal with that one.... get a 240V Fan and wire a small junction box with the 360 power lead (maybe with the sky box power lead as well)...and the fan power lead into the same box. That way when the 240V power is running for the Sky Box and the 360 the fan will always be running too. Just provide a single switch that powers them up.

The other alternative is one of those smart power strips, that powers one socket constantly and when you turn the device on that is connected to that socket, the other three sockets power up. So connect the X-box or Sky Box to the primary socket and the fan to one of the others..... every time you turn on the X-Box the fan will then start up.

Best Regards,
Julian (Fozzy The Bear)

 

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