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Thermostat problems Mr. R 02-11-2007
`--> Re: Thermostat problems =?ISO-8859-1?Q?...02-12-2007
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Posted by Mr. R on February 11, 2007, 10:50 am


I had a Honeywell digital thermostat in a good interior wall location. It
seemed to behave well except when it was really cold outside. When that
happened, my setting of 68 would invariably go to 72, and sometime more.
Thinking that the thermostat was defective, I bought a new one and it still
continues. Can anyone advise why the thermostat won't cut out the furnace
when the setting temperature has been reached ... only when it's extremely
cold outside?



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Posted by Tony Hwang on February 11, 2007, 11:20 am


Mr. R wrote:

> I had a Honeywell digital thermostat in a good interior wall location. It
> seemed to behave well except when it was really cold outside. When that
> happened, my setting of 68 would invariably go to 72, and sometime more.
> Thinking that the thermostat was defective, I bought a new one and it still
> continues. Can anyone advise why the thermostat won't cut out the furnace
> when the setting temperature has been reached ... only when it's extremely
> cold outside?
>
>
Hi,
On some like my Vision Pro 8000, I can set the temperature band tight or
little loose from service option.(Like +/- 2 degs. or +/- 1 degs. from
target temp.) You can look into this. Here right now it is -20C outside
but 'stat works to 20.5C bang on all the time. No over/under shoots.

Posted by =?ISO-8859-1?Q?Tekkie=AE?= on February 12, 2007, 8:01 pm


Tony Hwang wrote:
> Mr. R wrote:
>
>> I had a Honeywell digital thermostat in a good interior wall
>> location. It seemed to behave well except when it was really cold
>> outside. When that happened, my setting of 68 would invariably go to
>> 72, and sometime more. Thinking that the thermostat was defective, I
>> bought a new one and it still continues. Can anyone advise why the
>> thermostat won't cut out the furnace when the setting temperature has
>> been reached ... only when it's extremely cold outside?
>>
> Hi,
> On some like my Vision Pro 8000, I can set the temperature band tight or
> little loose from service option.(Like +/- 2 degs. or +/- 1 degs. from
> target temp.) You can look into this. Here right now it is -20C outside
> but 'stat works to 20.5C bang on all the time. No over/under shoots.

And this answers his question how?

Posted by Felder on February 11, 2007, 12:53 pm


> I had a Honeywell digital thermostat in a good interior wall location. It
> seemed to behave well except when it was really cold outside. When that
> happened, my setting of 68 would invariably go to 72, and sometime more.
> Thinking that the thermostat was defective, I bought a new one and it still
> continues. Can anyone advise why the thermostat won't cut out the furnace
> when the setting temperature has been reached ... only when it's extremely
> cold outside?

Just a thought, but are you sure nobody else in the house may have
bumped the temperature up? Ours is set to 68, but on a cold weekend
I'll bump it up to 70 using the temporary setting. The program will
still show a setting of 68 because I did not re-program it, but used
the temporary setting to increase the temperature.

-Felder


Posted by Mr. R on February 11, 2007, 1:09 pm


> Just a thought, but are you sure nobody else in the house may have
> bumped the temperature up? Ours is set to 68, but on a cold weekend
> I'll bump it up to 70 using the temporary setting. The program will
> still show a setting of 68 because I did not re-program it, but used
> the temporary setting to increase the temperature.
>
> -Felder

No. Just the wife and I and she does not touch it.

I have just taken a better look at the furnace, and there a Honeywell device
attached to it. The device is about the size of a pack of cards, and on the
front, it has the words "Cut In", and a screw here you can adjust a setting
which is in PSI, starting at 0.5, running to 9. What is this thing and
could it be the cause of my problem?



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