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Old 06-11-2007, 12:14 AM   #1
spamTHISbrp@yahoo.com
 
Default Thermostat that goes down to 32F?

I need a thermostat (simple mercury switch style) that goes down to 32F
or so, so I can heat a space only just enough to keep it from freezing.

So far, no luck.

Plan B is to just mount a regular thermostat, tilted, so as to skew the
temperature range. Just need the right night to calibrate it...


Dave

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Old 06-11-2007, 12:15 AM   #2
SQLit
 
Default Re: Thermostat that goes down to 32F?


<spamTHISbrp@yahoo.com> wrote in message
news:1132686109.880054.316940@o13g2000cwo.googlegr oups.com...
> I need a thermostat (simple mercury switch style) that goes down to 32F
> or so, so I can heat a space only just enough to keep it from freezing.
>
> So far, no luck.
>
> Plan B is to just mount a regular thermostat, tilted, so as to skew the
> temperature range. Just need the right night to calibrate it...
>
>
> Dave


line or low voltage?

Freezing starts above 32 F when I needed freeze protection I chose 40F,
small safety margin.


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Old 06-11-2007, 12:15 AM   #3
Joseph Meehan
 
Default Re: Thermostat that goes down to 32F?

spamTHISbrp@yahoo.com wrote:
>I need a thermostat (simple mercury switch style) that goes down to 32F
> or so, so I can heat a space only just enough to keep it from
> freezing.
>
> So far, no luck.
>
> Plan B is to just mount a regular thermostat, tilted, so as to skew
> the temperature range. Just need the right night to calibrate it...
>
>
> Dave


Careful there Dave. Setting a thermostat to 32 will not assure the
room and it's contents will be above freezing. A 10 spread from in
interior wall to an exterior will would not be uncommon and could be much
more. I have seem pipes freeze under a sink when the interior room
temperature was in the mid 50's.

--
Joseph Meehan

Dia duit


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Old 06-11-2007, 12:15 AM   #4
spamTHISbrp@yahoo.com
 
Default Re: Thermostat that goes down to 32F?

24v for a forced-air oil-fired unit, in the garage.

yeah, I'm looking for something that actually goes a little lower,
because if the lowest setting was 35 or so, the error tends to be worse
near the ends, so to speak.

I find myself intrigued by this unit:
http://www.heatline.com/Thermostats.htm
The thermostat pigtail would be useful.


Wiring in a relay is no biggie, or I maybe I could actually use it to
switch the 120V for the 24v transformer, depending on how the unit is
actually wired.

Wouldn't want to wire the furnace in directly, as it wouldn't run the
blower after the thermostat shuts off.

Dave

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Old 06-11-2007, 12:15 AM   #5
spamTHISbrp@yahoo.com
 
Default Re: Thermostat that goes down to 32F?

Oh, I have some experience with things freezing, I know.
See my prev. reply, and also, I'm tracking down the coldest spot along
the pipe run, and I'll put tjhe thermostat there.

Dave

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Old 06-11-2007, 12:15 AM   #6
Edwin Pawlowski
 
Default Re: Thermostat that goes down to 32F?


<spamTHISbrp@yahoo.com> wrote in message
news:1132687625.691417.260380@g49g2000cwa.googlegr oups.com...
> Oh, I have some experience with things freezing, I know.
> See my prev. reply, and also, I'm tracking down the coldest spot along
> the pipe run, and I'll put tjhe thermostat there.
>
> Dave


I have some experience with it also. You don't want a 32 degree T'stat no
matter where you think the cold spot is. I won't go below 40.

You may want to consider other methods. I know of one setup that will not
turn on the heat unless the outdoor temperature is below 33 degrees. I
have one building where the heaters are on timers. During very cold spells
I can have the thermostats do the work, but in milder times, it will only go
on for two one hour periods.


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