Dampp Chaser

[Clyde Hollinger]

Matthew,

You may get different responses to your question.  There can be a good bit
of variation in the installation of Dampp-Chaser systems for grands,
depending on the size of the piano, layout of the beams, amount of
variation in the room's humidity, etc.

In my opinion, a system can be considered complete without a heat bar under
the action, but there may be some instances where it is a good idea.  I
would install one there only if high humidity seems to have an adverse
effect on free response of the action or the regulation.  I don't recall
that I have ever installed a bar under the action.  Several years ago I
began servicing a Yamaha grand that already had a bar there, and the tuning
pins were loose, so I disconnected it.

Clyde Hollinger

Matthew Todd wrote:

> Greetings to all!
>
> Is it necessary to install a smaller dehumidifier underneath the
> keybed.  I have seen several pictures of where a dehumidifier is
> installed under the hammers and dampers, but then I also see a smaller
> one under the keybed.  I would like to know, so I know if I have the
> complete system or not.  I do not need the humidifier out here, since I
> live in the Pacific Northwest.
>
> Thanks!
>
> Matthew