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

[Stephen H. Fischer]

Hi,

If that one is in stores, it may fit the need.

But then I would have to figure out how to use it, I could not understand 
the diagram on my Heat / A/C and had to just experiment decades ago.

And I can read Super Computer logic diagrams, well back in 1969 I could.

Anything more complicated I think would not work, I would just need to find 
the A/C contacts and the Heat ones. Bypassing the switches as I have one 
pair of wires that will turn the heat or A/C on depending the setting of the 
one that is downstairs. Set the downstairs A/C temp and the second floor is 
too hot.

I really have done a strange hack, it was just luck finding that what I 
wanted would work.

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 7:08 PM
Subject: Re: [Coco] OT: Heat / A/C controller replacement


> 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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