[CAUT] Organs and RH

[Wigent, Donald E]

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I think that your are on the rite track controlling the intire room.  If
the blower is taking air from the same room, then your good to go,
because the air is captive and you maybe can control it.  You can get a
adjustable stat from Moisture king and connect it to everything. The
adjustable stat might be helpful in coming up with a workable moisture
level. Moistureking.com

Don wigent=20

Wigentd@mail.ecu.edu =20

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From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
Jim Busby
Sent: Tuesday, November 23, 2004 9:28 PM
To: College and University Technicians
Subject: RE: [CAUT] Organs and RH

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Hi Geoffrey,

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Glad to know I'm not the only one with this predicament!

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I need to get with the organ man and see what he thinks will be best for
the organ. This is a very expensive organ so the school may want to
reconsider a room RH control device. I know little about organs, but
what you say makes sense.=20

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Thanks for your feedback,

Jim Busby BYU

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-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
Geoffrey Pollard
Sent: Tuesday, November 23, 2004 6:20 PM
To: College and University Technicians
Subject: Re: [CAUT] Organs and RH

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Hi Jim,

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We have a similar situation at the Sydney Conservatorium - organ and
harpsichord in the same room. It is on the north side of the building
and sun streams through the windows especially in summer ( southern
hemisphere, for those to whom this sounds wrong!), and plays havoc with
the RH and temperature. There is AC but no humidity control for the
room.

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We have as much if not more trouble with the organ tuning, due to the RH
and temp changes, than with the harpsichord. Organ tuning is much less
frequent and more expensive, so the organ is in poor shape a lot of the
time. As you may know, when RH and temp change, the pitch of metal pipes
and wooden pipes move in opposite directions  - **%$@!

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Regarding airflow through the organ, I don't know how it affects the
overall room condition but I have been told by an organ builder that the
forced flow of low RH air through an organ will lead to rapid damage to
wooden pipes.

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Our fix is to lock the AC control at 21 degrees and put tinting film on
the windows.

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I too have my doubts as to the effectiveness of a DC system under the
harpsichord. As cost is the issue, even a smaller, therefore cheaper,
room unit will minimise the swings. Not perfect, but perhaps no longer
damaging to timber and somewhat more stable tuning.

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The college may not believe that one harpsichord warrants a room unit,
so base your argument on potential damage to the $360,000 organ and you
might get your two birds!

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Good luck,

Geoff Pollard

Piano Technician

Sydney Conservatorium of Music

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	List,

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	Does having a large pipe organ in the room affect the RH? By
that I mean, does all the air passing through an organ's pipes dry out
the air and/or does the pump/bellows compress air and make more/less
moisture?

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	Thanks,

	Jim Busby BYU

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