Yes, a "dehumidistat" (not a commonly used term or commonly found item)
would work without the need for extra power or relay, and your solution does
indeed allow a standard "humidistat" to be used as well. Both are workable
solutions.

Smarty


"mm" wrote in message
...
On Fri, 10 Aug 2007 02:45:58 -0400, "Smarty"
wrote:

Instead of adding a power supply and relay to invert the humidistat
control,
another simpler approach would be to use a wall control which "closes" on

I suggested what I did because of your post at xx:12 o'clock which
said that a conventional humidistat would not work, and implied that
the reply previous to that post suggested a conventional humidistat.

You said what was needed was the opposite, but didn't actually say
they made such things.

So I was saying that if, as I gleaned from your post, they don't make
the kind of humidistat that you say is needed, then you can add a
relay to use the kind they do make. I think the relay would only cost
about 4 dollars.

rising humidity such as this one which are designed for the application
requested by the original post:

http://www.amazon.com/Honeywell-H46C.../dp/B00069ECM2

So this one would work in parallel with a thermostat, as udarrell
suggested, no other parts needed? Great.

I guess to simplify this, For use when it is too humid, be sure to get
a humidistat for a dehumidifier and not one for a humidifier.


Smarty



"mm" wrote in message
. ..
On Thu, 09 Aug 2007 23:08:42 -0400, mm
wrote:


1) In parallal with the t-stat, so that the ac will run until both
standards are met. I'd have to review the thermostat wiring diagram
and how the AC works, or just wait until somene says, to know if this
is an easy thing to do, but it seems like it might be the best.

To add to my post: To compensate for what Smarty says, you would need
to put in a 24 volt relay in the h-stat that would turn the load off
when the relay is on, and turn the load on when the relay is off.

By load, I mean the wires from the ac that go to the t-stat and which
would have gone directly to the h-stat if it weren't backwards from
you want.

By the relay on or off, I mean a simple relay that has a 24v power
supply and is turned on when the the H-stat says it should be, and off
when the h-stat says it should be. On is when the contacts in the
H-stat are closed and off is when they are open.

If they don't sell them with this relay as an attachment, it would
still be easy to get one and easy to do. I say 24 volts because there
are loads and loads of 24 volt relays and that is the voltage supplied
to the t-stat to begin with. You don't need single pole single throw,
but get DPDT anyhow for a dollar more. You'll find other uses for the
other parts. Maybe you'll want to turn an indicator light on when you
turn the AC off, or whatever.