[Coco] OT: Heat / A/C controller replacement

[Louis Ciotti]

I assume you need something unique that a standard Heat/AC thermostat
will not work?



On Thu, Jun 7, 2012 at 5:02 PM, Stephen H. Fischer
<SFischer1 at mindspring.com> wrote:
> Hi,
>
> HELP!
>
> My hand constructed Heat / A/C control failed when the power went off and it
> is beyond my current ability to fix it. (data sheets are hidden, I did not
> draw up a plan, just wired the chips up looking at the data books many
> decades ago.)
>
> ---------------------------
> The basic operation was a LM3911 that sensed the temperature and
> CMOS chips drove a triac (AC power relay).
>
> There was a pot that controlled the set point and more parts to trim the
> pots range and drive LED's.
>
> ---------------------------
> What I am looking for is a off the shelf controller that I can change the
> desired temperature easily and have an off switch for use when I do not use
> the heat or A/C.
>
> The present controller is just a relay that just shorts the heat / A/C power
> just like a switch which is how I will be doing it if an replacement cannot
> be found. The normal house controls are used to switch from heat to A/C and
> prevent the house being heated too much or cooled too much in case of
> a failure
>
> It was good that the power failure did it's damage when the home-brew
> controller was off/
>
> I know this is a weird request and will not make sense to those who know how
> heat / A/C work.
>
> No timed options needed and other bells / chimes that the current
> controllers have, I want to just set the temperature and turn it on and off.
>
> SHF
>
>
>
>
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