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

[Louis Ciotti]

For simple design, and years of use you can't beat the honewell round
thermostats.

http://www.amazon.com/Honeywell-CT87N1001-Round-Manual-Thermostat/dp/B000FCCZ5Q

These work on LOW voltage, i.e. 20-30 VAC, typical in all heating systems.



On Thu, Jun 7, 2012 at 10:01 PM, Stephen H. Fischer
<SFischer1 at mindspring.com> wrote:
> Hi,
>
> My Heat / A/C was installed ~ 1971.
>
> Today's Heat / A/C controllers likely have an wireless internet address.
>
> I just am looking for ideas as to how a old heat / A/C controller could be
> used like the one I built ~ 30+ years ago.
>
> Links to the old controllers available today might be a starting point.
>
> I fear walking into a hardware store would produce smart phones to control
> Heat / A/C from Perth.
>
> SHF
>
> ----- Original Message ----- From: "Louis Ciotti" <lciotti1 at gmail.com>
> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
> Sent: Thursday, June 07, 2012 6:50 PM
> Subject: Re: [Coco] OT: Heat / A/C controller replacement
>
>
>
>> 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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>>
>>
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