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

[Stephen H. Fischer]

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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