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Posted by geothermaljones on February 26, 2008, 5:53 pm
Never cared much for setback stats on scorched air units, but on radiators
they don't seem to make any sense at all.
How far down is your setback point that allows the units to freeze?
Do you have a stat & control for each radiator, or one for a number of
different spaces?
It'd make some sense to put a pump exerciser on the circ pump & have it run
for a minute every 15, 30, or 60 minutes just to move some water through...
I think your problem has little to do with the stats.
goodluck
geothermaljones
> We are looking for programmable setback thermostats for our radiant
> hot water heating system in our building.
> Freeze control is the real driving requirement, as the rads are on the
> outside cold wall of the units, and have a tendancy to freeze solid
> with the resulant mess in winter.
>
> To prevent that, a program that temporarily cycles the heat on is
> needed (for instance 1 out of every 30 minutes), in addition to the
> normal freeze control program that is based on ambient air temp. The
> heater control is a normally closed (NC) circuit, where an open
> circuit causes the valve to open and hot water to circulate.
>
> Can anyone point me to programmable thermostats with all of these
> features?
>
> Any help much appreciated.
>
> Barry
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