Dampp-Chaser recommendations

[David Skolnik]

Terry
On behalf of my brain, I'd like to apologize.  I don't know what it was 
thinking.  Not until I read "five little rods", did I realize that I, er, 
it was visualizing 190 watts coming from one single bar, or at least 
concentrated at one point.  And, earlier, with regard to my concerns about 
mildew, you indicated that you are only running the dehumidifier on your 
piano.  I'll try to be more careful.  One more thing...could you  work out 
the math on what the cost would be of running 190 watts for 80% of the day 
(19.20hrs) for X number of humid days of the year?  How would that compare 
to installing a cover?

David Skolnik



At 07:09 AM 6/22/2004 -0400, you wrote:
>If the room is at 75 degrees F and 75% RH you need to get the piano
>environment to 92 degrees to get 45% RH - not a whole lot of heat. Your
>concern is legitimate though because I believe there is some sort of delay
>for the H2 humidistat to click on and off. It's been a couple years since I
>ran my little temp/RH trials on my piano, but I don't recall it ever
>reaching 100 degrees under the soundboard, and I do remember that will less
>wattage the unit never turned off during periods of high humidity. Even with
>five little rods under there, it's not as if it is like a blast furnace
>going off. Maybe I have too much air movement. If I were to re-install a
>system on my piano, I would thoroughly explore a bottom cover before simply
>adding wattage. Bottom covers were not available when I did my installation.
>
>Why don't I put a bottom cover on it now? I will. That task is #2,573 on my
>To-Do list.
>
>Oh, and my piano is for sale (great piano)!
>
>Terry Farrell
>
>----- Original Message -----
>From: "V T" <pianovt@yahoo.com>
>To: <pianotech@ptg.org>
>Sent: Tuesday, June 22, 2004 2:23 AM
>Subject: Dampp-Chaser recommendations
>
>
> > Hi David,
> >
> > Yes, 190 Watts seems like quite a bit of power for
> > this application; it seems that he has a somewhat
> > severe environment around the piano.
> >
> > When the heater rods are hooked up to the humidistat,
> > they will cycle on and off.  Having 190 Watts (instead
> > of say 60) will make the air heat up more quickly.  As
> > long as the humidistat manages to shut off, the
> > "average" temperature will not differ by a huge
> > amount when you compare the 190W and the 60W system.
> >
> > The problem with excessive power is that the
> > soundboard could be shocked from cold to warm in a
> > relatively short amount of time, and that the peak
> > temperature before things stabilize can be much higher
> > with the 190W system. My preference would be to change
> > the temperature more gradually, and that would be
> > better accomplished with less power.
> >
> > Basically, I would say that one wants the least amount
> > of power that will shut off the humidistat when the
> > humidity is at the top of its expected range.  This
> > will prevent very sudden changes in temperature
> > and excessive transient temperature peaks.
> >
> > Vladan
> >
> >
> > Andrew-
> >
> > My original question regarding excess heat was in
> > response to Terry
> > Farrell"s comment:
> >
> > >I own a Boston GP-178, which is located in my home. I
> > have about five rods
> > >on it totaling about 190 Watts.
> >
> > I wondered if, at some point, the elevated temperature
> > itself (even with
> > sufficient humidity) can have some negative effect on
> > the soundboard.  It
> > seems there has to be SOME limit, yes? no?
> >
> > David Skolnik
> >
> >
> >
> >
> >
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