Dampp-Chaser recommendations

[Farrell]

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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