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Posted by on February 1, 2007, 8:12 am
> Zephyr wrote:
> > Hey all,
>
> > My furnace seems to be running all right, but, one thing has me
> > curious.
> > I've got a Honeywell stat that is supposed to have "smart recovery"
> > that learns the amount of time necessary to re heat in the morning.
> > It takes the furnace about an hr to get back up from 57 to the 69 I
> > ask for in the morning with the outside temp in the single to teen
> > digits (Michigan)
>
> > In the mornings the heat will turn on around 6 to have the house warm
> > by 7. The odd thing is that the furnace will run for about 30 minutes
> > or more, then it will then stop for about a minute or 2 then turn
> > back on continuing to heat. At the time the furnace turns off it
> > might have raised the temp from 57 to 65 or so, on its way to 69.
>
> > The stat has a "heat" indicator on the display and while it is
> > blinking "recovery" indicating that the system is trying to re heat
> > the house, the "heat" indicator will turn off.
>
> > The fan will run for a few minutes after the heat indicator turns
> > off, then the whole system will sit for a minute or too, then it will
> > turn back on, and work its way back up to the desired temp.
>
> > Is this normal? should the furnace not run straight thru up until it
> > reaches the desired temp?
>
> > I've got an older (17 yrs??) furnace Thermo Pride Furnace which I
> > believe has an 80% efficiency (based on btu IN/OUT calcs on the
> > stickers. The house is about 30 yrs old 2200 sq/ft.
>
> > Thanks for any and all comments / info
>
> > Dave
>
> I would not call it normal (Maybe for a heat pump, they often have a few
> special tricks to reduce heating cost).
>
> There may be a problem with the furnace (sounds like a gas furnace).
> Maybe it is detecting a overheat situation at the burner. That could be a
> bad sensor.
>
It isn't a problem with the furnace, because he said that when this
happens, the "heat" indicator on the thermostat goes out and the
recovery indicator stays on. If it were the furnace, the heat
indicator on the thermostat would not change.
I think the service menu that Tony is referring to is the advanced
settings menu in the thermostat. Some of the HW thermostats, like
the LCD touchscreeen (8600?) ones have a zillion settings. It's
possible something in there controls this. Like maybe it's set for
some dual fuel system option, where it uses one fuel to get most of
the way, then switches.
If you can't find a setting, I'd contact HW or look on their FAQ page,
etc. My vote is this isn't right, and it's either a setting or a
software bug, but it's not a failure in the thermostat.
> In all fairness, I am making a lot of guesses here, but I suspect you
> will need to have someone check out the furnace. If it needs repair, I
> would consider a newer high efficiency furnace as it may not pay to repair
> that lower efficiency one in the long run.
>
> --
> Joseph Meehan
>
> Dia 's Muire duit- Hide quoted text -
>
> - Show quoted text -
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