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April Aire Humidifier Installation Question komobu 04-05-2008
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Posted by komobu on April 5, 2008, 5:51 pm
Hi;

I had an April Aire 650 Whole House humidifier installed in my house.
It is a bypass model. They ran a thermocouple outside and I am not
quite grasping why. I am not questioning the install, I am just trying
to understand the concept. I can see where the unit would like to know
the temperature of the air so it can figure out the relative humidity,
but to take that reading outside doesn't seem logical since it is
using the return air in the house. It would seem to make more sense to
me to place the thermocouple in the return air duct. Am I missing
something? Please explain if you have the time.

Thanks
Pat

Posted by Joseph Meehan on April 5, 2008, 7:46 pm
The sensor tells the unit how cold it is outside. When it gets very
cold line -20º you don't want the interior humidity to be as high as you
might want it when it is say 40º. If you tried to maintain 60% humidity
when it is -20º outside, you would tend to get a lot of moisture freezing on
windows, condensing in wall insulation etc.

> Hi;
>
> I had an April Aire 650 Whole House humidifier installed in my house.
> It is a bypass model. They ran a thermocouple outside and I am not
> quite grasping why. I am not questioning the install, I am just trying
> to understand the concept. I can see where the unit would like to know
> the temperature of the air so it can figure out the relative humidity,
> but to take that reading outside doesn't seem logical since it is
> using the return air in the house. It would seem to make more sense to
> me to place the thermocouple in the return air duct. Am I missing
> something? Please explain if you have the time.
>
> Thanks
> Pat


--
Joseph Meehan

Dia 's Muire duit




Posted by KJPRO on April 8, 2008, 12:34 am

> The sensor tells the unit how cold it is outside. When it gets very
> cold line -20º you don't want the interior humidity to be as high as you
> might want it when it is say 40º. If you tried to maintain 60% humidity
> when it is -20º outside, you would tend to get a lot of moisture freezing
> on windows, condensing in wall insulation etc.


You go Joe :-)



Posted by Dr. Hardcrab on April 13, 2008, 8:48 am

>
>> The sensor tells the unit how cold it is outside. When it gets very
>> cold line -20º you don't want the interior humidity to be as high as you
>> might want it when it is say 40º. If you tried to maintain 60% humidity
>> when it is -20º outside, you would tend to get a lot of moisture freezing
>> on windows, condensing in wall insulation etc.
>
>
> You go Joe :-)

I was going to say the same thing! Bravo Meester Meehan.

I've had to explain that to a lot of customers, but methinks I will just
print your answer out on little cards...

;-]


Posted by Paul Franklin on April 5, 2008, 7:52 pm
wrote:

>Hi;
>
>I had an April Aire 650 Whole House humidifier installed in my house.
>It is a bypass model. They ran a thermocouple outside and I am not
>quite grasping why. I am not questioning the install, I am just trying
>to understand the concept. I can see where the unit would like to know
>the temperature of the air so it can figure out the relative humidity,
>but to take that reading outside doesn't seem logical since it is
>using the return air in the house. It would seem to make more sense to
>me to place the thermocouple in the return air duct. Am I missing
>something? Please explain if you have the time.
>
>Thanks
>Pat

It's usual practice to lower the relative humidity inside as the
outside temperature drops. This is to minimize the chance that you'll
have condensation form on windows, or worse, inside walls due to air
leaks through the walls and insulation. My humidifier has a manual
control with instructions to set it based on outside temperature. You
apparently have a model that makes the adjustment automatically.

The actual humidity level is controlled by a humidistat in the supply
air duct (usually), so there is no need to measure the return air
temp.

HTH,

Paul F.





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