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WHY RELAY for Humidifier?

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WHY RELAY for Humidifier? dantheman 11-06-2006
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Posted by dantheman on November 6, 2006, 7:58 am
I wish to have my Aprilaire 600 humidifier active during blower-on
(instead of gas-on like my Carrier is set up)... I leave my blower on
continuous... Carrier book says I need to use a relay off of EAC (115v)
but if blower is continuous, and EAC is energized, why not just the
Transformer to the Humidifier? What am I missing here?

Peace, Dan


Posted by jamesgangnc on November 6, 2006, 8:14 am
Adding a bunch of water vapor to cold air is probably going to condense
out and then you'll have water/mold/etc problems. That what you're
missing?

dantheman wrote:
> I wish to have my Aprilaire 600 humidifier active during blower-on
> (instead of gas-on like my Carrier is set up)... I leave my blower on
> continuous... Carrier book says I need to use a relay off of EAC (115v)
> but if blower is continuous, and EAC is energized, why not just the
> Transformer to the Humidifier? What am I missing here?
>
> Peace, Dan


Posted by dantheman on November 6, 2006, 9:23 am

jamesgangnc wrote:
> Adding a bunch of water vapor to cold air is probably going to condense
> out and then you'll have water/mold/etc problems. That what you're
> missing?

This true folks? The return air in the winter time isn't really that
"cold"--around 72 deg... I guess I'd be able to see this condensing
water at the filter (bottom of return duct)?

My problem is that the burners don't run often and long enough to allow
the humidifier to do its job... small house... good insulation... HRV
pumping out humidity... etc.

Peace, Dan


Posted by jamesgangnc on November 6, 2006, 9:31 am
That means your furnace is oversized. Too late to fix that. Try some
standalone room humidifiers. You really don't want to screw around
with water in your duct work. Once you get mold in there you are
f*$%&d.

dantheman wrote:
> jamesgangnc wrote:
> > Adding a bunch of water vapor to cold air is probably going to condense
> > out and then you'll have water/mold/etc problems. That what you're
> > missing?
>
> This true folks? The return air in the winter time isn't really that
> "cold"--around 72 deg... I guess I'd be able to see this condensing
> water at the filter (bottom of return duct)?
>
> My problem is that the burners don't run often and long enough to allow
> the humidifier to do its job... small house... good insulation... HRV
> pumping out humidity... etc.
>
> Peace, Dan


Posted by dantheman on November 6, 2006, 12:38 pm

jamesgangnc wrote:
> That means your furnace is oversized. Too late to fix that. Try some

If this really is the case, then I'm pissed--this is one major job that
I totally trusted a local "reputable" and expensive HVAC shop... all
certified professionals to boot...

Peace, Dan


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