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Posted by AKS on November 8, 2006, 5:06 pm
There are systems that can control Relative Humidity's
with in 3 or 4% with out any problems however you are
looking at big bucks I work on systems that control
temperature plus and minus 1/2 Deg. F. and like wise
Relative Humidity's plus and minus 1%. for example
70 Deg. F. and 36% RH. Once you start to control RH
the cost of instrumentation goes up quickly.
I would suggest that you have talk to you customer
If he want that type control let me know I will point
you in right direction.
Good luck from Dido
www.cas-environ.com
> hi everyone, I'm new in the business (just got my EPA type I and II
> licenses) and have a request from a customer for a manuscript storage area
> with a need for a humidistat control. temperature does not matter as it's
> year-round cool due to a high altitude but the area gets rain 5 days out
> of 7 and humidity control is difficult
>
> as the documents are stored in an area with irregular electric service,
> we've already created a generator and solar (with inverters and battery
> banks) backup system which is instantly activated if there is a power
> loss.
>
> I have a couple very promising mini-splits on hand which have the ability
> to run blower at very low speeds and the systems would be started in
> series (relays already installed) with a 5 min delay to minimize instant
> on power surge
>
> the humidistat control I'm looking for would have to be a fairly simple
> piece of 24v controller, it can have the usual 5% accuracy but would have
> to have at least some of these capabilities
>
> maximum 52% relative humidity with ability to turn off at a lower value or
> range
> no reheat system
> ability to set minimum and max for relative humidity
>
> all the controls I've looked at so far have a range of 6 or 8% and don't
> have any adjustment capability
> when the new visionpro iaq became available I was hoping it would allow me
> a way to program only based on humidity range but it's also limited in
> this
>
> the ideal control would monitor indoor humidity (not temperature) and turn
> on first system when 53% is detected but have the ability to shut down
> when humidity is dropped to 49-50%.
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