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Re: OT (most likely) strange modem disconnection when using USB drives



On Tue, 2007-10-02 at 12:50 -0600, Frank Cox wrote:

> There are also some weird effects that can be created by hooking devices from
> different circuits together.  I know that the electrician here had to do some
> fancy stuff to make my air conditioners and the zone valves on my hot water
> heating system work properly as they run on different circuits.  It ended up
> that there was no easy way to use a single thermostat in the rooms, even though
> the devices would never be on at the same time and even though the thermostats
> physically switch from "cool" to "heat" so you wouldn't think there would be a
> conflict.

"Ice-cube" (little small block looking) relays would do the trick. They
just won't look very nice unless you hid them up in the attic or under
the house ... wherever your primary control wiring runs. If I remember
correctly, white = heat, green = fan, yellow = cooling, with red as
common. Better check that. The thermostat would nicely control the 24v
coils to the relays and the contacts to the relays don't care what the
voltage is or the transformer source (which might have been your
problem, multiple 24v transformers, ie: old boiler system with new
package unit AC) is used to close the Heating / AC / Fan circuits. It
would be really strange for them to not be 24v. Yup, some small relays
would have fixed that sho' nuff. Ric  
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