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Posted by Robert11 on December 31, 2006, 10:26 am
Hello:
Have a gas, forced hot water heating system.
Was about to order a Honeywell thermostat over the web, but had the
following concern which
just dawned on me.
Am interested in their digital model RTH 5100 which is non-programmable.
It says on their ad sheet that it maintains the set-point if there is a
power outage.
O.K., that's great.
But even if there is house power--
These units require a battery or two.
What happens if the battery runs down while you are away ?
I know, use new, fresh, batteries, etc. But-
Will the furnace shut off if battery runs down ?
Or, is the battery only for the display, and the circuitry still works ? If
so, how, as there's no current when
the circuit is calling for no heat thru the 2 wires.
e.g., with no thermostat battery voltage, does the curcuitry default to a
circuit closed condition, which would
keep the furnace active, or... ?
A bit worried about this.
Thanks,
Bob
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Posted by Edwin Pawlowski on December 31, 2006, 11:39 am
> What happens if the battery runs down while you are away ?
> I know, use new, fresh, batteries, etc. But-> A bit worried about this.
>
Replace the batteries once a year. I've had programmable state for about 20
years and never had a problem from battery failure.
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Posted by on December 31, 2006, 12:59 pm
Edwin Pawlowski wrote:
> > What happens if the battery runs down while you are away ?
> > I know, use new, fresh, batteries, etc. But-> A bit worried about this.
> >
>
> Replace the batteries once a year. I've had programmable state for about 20
> years and never had a problem from battery failure.
Some of the digital models have a failsafe mechanical backup that will
kick in at a fixed low temp like 45. You'd have to pull up the specs
to see if this one has it.
For digital thermostats, I like the Honeywell LCD touchscreen. Not
sure of the model, 8600?. Two key features I like are adaptive
recovery, where you just set it for the time you want the new temp to
be reached, eg 70 at 7AM. Based on experience, the thermostat gets
the furnace going at whatever time prior to 7am that it figures out it
needs to. It also has vacation hold mode, where you can set a temp to
be held for X days before it resumes it's regular schedule.
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Posted by Ken on December 31, 2006, 1:07 pm
Robert11 wrote:
> Hello:
>
> Have a gas, forced hot water heating system.
> Was about to order a Honeywell thermostat over the web, but had the
> following concern which
> just dawned on me.
>
> Am interested in their digital model RTH 5100 which is non-programmable.
>
> It says on their ad sheet that it maintains the set-point if there is a
> power outage.
> O.K., that's great.
>
> But even if there is house power--
>
> These units require a battery or two.
>
> What happens if the battery runs down while you are away ?
> I know, use new, fresh, batteries, etc. But-
>
> Will the furnace shut off if battery runs down ?
>
> Or, is the battery only for the display, and the circuitry still works ? If
> so, how, as there's no current when
> the circuit is calling for no heat thru the 2 wires.
>
> e.g., with no thermostat battery voltage, does the curcuitry default to a
> circuit closed condition, which would
> keep the furnace active, or... ?
>
> A bit worried about this.
>
> Thanks,
> Bob
>
>
As Edwin stated, if you replace the batteries occasionally you will
never have a problem. But I believe the settings (day, time, and temp)
are lost if the battery gets too low. There is however a default
setting I believe the thermostat will revert to, and that is somewhere
around 70 degrees. So even if you lost your settings, it would not heat
or cool the home excessively. Again, I believe that is what most would
do and that is what mine do.
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Posted by on December 31, 2006, 3:57 pm
> Robert11 wrote:
>> Hello:
>>
Snip
>>
>>
> As Edwin stated, if you replace the batteries occasionally you will never
> have a problem. But I believe the settings (day, time, and temp) are lost
> if the battery gets too low. There is however a default setting I believe
> the thermostat will revert to, and that is somewhere around 70 degrees.
> So even if you lost your settings, it would not heat or cool the home
> excessively. Again, I believe that is what most would do and that is what
> mine do.
That is what my Honeywell did, too,
aem sends...
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