Just to clarify several points about the operation of the Dampp-Chaser system: The humidistat operates the humidifier so that it comes on at 40% RH and stays on until the environment it detects is 48% RH. At this point it turns off and the dehumidifiers come on. They stay on until the humidity drops to 40% RH and the process repeats itself. If the ambient humidity level is 90%, I'll guarantee that the dehumidifiers will be on for a reasonably long period of time. It is difficult to get 90% down to 40% unless you are dealing with a small volume of air that does not have moisture being reintroduced. You are quite right about being concerned with the inside RH "where it really matters". All to frequently one tries to equate inside humidity with what's happening outside. Generally this is misleading. The best thing to do is measure the inside humidity level. Webb Phillips at 800-622-7426 makes a rack for the humidity control system that is self supported and does not rely on the piano. He has used this system for years where it was not practical to make the installation in the piano itself. If you are interested in humidifying the B that is giving you trouble, I'd suggest getting in touch with Webb (or Ruth Brown). The suggested price to technicians for the Smart Heater Bar is : As part of a new system: Grand $20.23 added to the cost of the system Vertical $20.68 added to the cost of the system As a retrofit for systems currently installed: Grand $30.13 Vertical $31.22 Limited quantities are available now, through your distributor. Production quantities will be available April 15th.
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