<VV> Was Car cover/Moisture. Now Humidistat

[Dave Keillor]

A differential humidistat is fine as long as the inside and outside temps
are about equal.  However if it's a lot colder outside, the relative
humidity could be quite high outside, but the actual moisture content of the
air quite low (happens all the time in a Minnesota winter).

Dave Keillor

-----Original Message-----
From: RoboMan91324@aol.com [mailto:RoboMan91324@aol.com]
Sent: Friday, October 29, 2004 12:58 PM
To: virtualvairs@corvair.org; hmlinc@sbcglobal.net
Subject: <VV> Was Car cover/Moisture. Now Humidistat


Hi JR,

I don't know if this has been addressed but you can buy a humidistat any 
number of places including your neighborhood HVAC professional, eBay and
maybe 
even your DIY stores.  However, you may want to consider several things.  If
you 
have a single stat that turns on the vent fan when the humidity gets to the 
set point inside the garage, you may be sucking in air from outside that has

higher humidity.  This defeats your purpose.  You may want to consider a 
differential system with a stat both inside and outside.  If the humidity is
higher 
outside, it will override the stat inside and prevent the fan from starting.

Honeywell, Johnson Controls and others make these dual bulb stats or you can
do 
this with two separate stats if one has normally open capability and the
other 
has normally closed capability.  You will also either want an industrial
stat 
that can carry the current of the fan or you will need a relay to switch on 
the fan if you use a light duty stat.  If you install a through-the-wall or
a 
window AC instead of a vent fan, you can control it with a humidistat and
dry 
the air inside the garage whatever the outside humidity is.  If you do this,

you probably will want to set the AC on full recirculate if it has that
setting. 
 Again, if the AC vents air, it will potentially pull in humid air from 
outside that will need to be dried out.  You will need to fiddle with the 
thermostat on the AC to allow the humidistat to override the control at low 
temperature.  Lastly, the moisture condensed from the air inside the garage
needs to 
drain somewhere.  If you are in a colder climate, the drain port of the AC
may 
freeze over outside.  The water must go somewhere and may even end up
draining 
back into your garage.  You can drain the moisture into a sink or floor
drain 
inside the garage if you have one.  Have fun.

Doc
~~~~~~~~~~~~~~
In a message dated 10/25/2004 3:27:59 PM Pacific Daylight Time, 
virtualvairs-request@corvair.org writes:

> Message: 5
> From: "J R Read_HML" <hmlinc@sbcglobal.net>
> To: "Bill Elliott" <Corvair@fnader.com>, <virtualvairs@corvair.org>
> Subject: Re: <VV> Re: Car cover/Moisture
> Date: Mon, 25 Oct 2004 15:36:34 -0500
> 
> The Vair does not go in-out in winter, but Momma's car - parked right next

> to it brings salty slush to the garage floor.  When the temp is above 32,
I 
> promptly shovel - broom that stuff OUT!
> 
> I'll look into venting.  Does anyone know if there is a vent/fan combo
that 
> turns on when the humidity reaches a pre-set level?
> 
> Attachments (if any) are scanned with anti-virus software.
> 
> Later, JR
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