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:
how is a 2 stage furnace suppose to work?
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Duane Bozarth
Posts: n/a
wrote:
....
... I'm not sure
how a 2-stage stat could really be all that more intelligent. It
would come down to the stat having some kind of knowledge systems that
would tell it when to kick into high asap vs wait 5 or wait 10, etc.
It seems like the characteristics of the furnace, the current inside
temp, the outside temp, the desired temp, and the efficiency of the
furnace/ducting would all have to be constantly analyzed to sort out
the best approach. Seems like too much to ask of a $100-$200 piece of
electronics.
....
Some (well at least one
) simply look at the temperature differential
(setpoint-actual) and the rate of change of the actual and use that...if
delta_T is so big, then both stages or if dT isn't quite so big but T
isn't catching up, etc...is an application of "fuzzy logic"
algorithms....whether it is any more efficient in the end, I have no
data to help...but it doesn't use any additional inputs, just a simple
microprocessor and some logic.
Don't recall which thermostat used it, saw it in a new product section
in a mechanical engineering trade mag some years ago...
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