DC Query

[PAT A RALPH]

Richard,

D-C has a system for verticals when there is not enough space inside to
install the system OR the inside system is not able to do the job AND it
uses a plastic sheet over the back of the piano.  I have not used the system
or have heard of anyone using it and what is does to the sound??   I am sure
there are enough little holes  at the back of the keyboard cavity that
moisture can leak out and not cause any damage to the underside of the
grands.  BUT best bet is to contact D-C directly.  I am sure they have some
data from tests run on their systems before offering them for sale to
technicians.

Ken Gerler

----- Original Message -----
From: Richard Brekne <richardb@c2i.net>
To: PTG <pianotech@ptg.org>
Sent: Sunday, March 05, 2000 3:13 PM
Subject: DC Query


> Hi list
>
> I just installed a DampChaser system on two of our grands at the
> conservatory here in Bergen. I have placed a hygrometer under each  and
> kept an eye on how the system is doing and found that the humidity
> varies within about a 15% range daily, pretty uniformly over the whole
> soundboard. I dont know how long the humidity stays at any particular
> level tho as the hygrometers just show the present, high, and low levels
> each time I check them.
>
> The guy who runs the import of these in Norway suggests that I cover the
> bottom of the grand with a thin plastic film, enclosing thus the whole
> system and underside of the grands.
>
> It is this I am wondering about. Do any of you have experience with this
> kinda thing ?  How does it affect the sound of the pianos ?? Are there
> better solutions ? Couldnt this cause damageing condensation ???
>
> The two rooms are quite different in size, the smaller being just big
> enough to house a 215 cm grand and the other being large enough for 5 or
> 6 such grands. Both are on the buildings ventilation system which pumps
> lots of dry air into each room constantly. And both systems register
> about the same amount of variance. Each system is installed just a bit
> back of center of panel due to beam considerations, and are as high up
> under the panel as I could get them. The hydrostats are located just
> forward (keyside) and one beam width apart from the humidifier, and also
> just about as high up as I could get them. Humidity levels read from low
> 30's to around 45-46 % in each case.
>
> Any suggestions will be gratefully read.. grin.
>
> --
> Richard Brekne
> Associate PTG, N.P.T.F.
> Bergen, Norway
>
>
>
>