Tomes wrote:

"LDC" wrote in message
...
On Fri, 24 Feb 2006 03:52:23 GMT, "Tomes" wrote:


"John" wrote in message ...
Are there any thermostats (any type) that are smart enough not to
turn on the heat at 10:55 when they are programmed to set back at
11:00? It seems wasteful and hard on the equipment to do so.


In this case I would just set it for 10:55. The time set is when the
instruction changes.
Tomes

I think you missing the problem as that doesn't solve anything.
Regardless of what the time the change is set he is trying to find a stat
that is smart enough to avoid a 2 or 3 minute truncated "on" cycle at the
end of a program period by anticipating the pending change.

Using made up numbers, the stat would only come on if it could get a full
10 minute or longer "on" cycle, So while the program setting changes at
11:00, the latest the unit would come on would be 10: 50. If the unit was
already running at 10:50 it would continue to run as long a necesary up to
11:00. If the unit was off at 10:50 it would anticipate the 11:00 change
and would not start an "on" cycle..



.... and this is exactly the same as setting it to 10:50. Really, it is.
The same things are happening at the same times.

No it's not, because the thermostat calling for heat at 10:49 with a setback
time of 10:50 is the same issue. The time of day isn't important, preventing
the unnecessary short cycle is.